UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2022

OR

Commission File Number 001-40839

GigCapital5, Inc.

(Exact name of Registrant as specified in its Charter)

Registrant’s telephone number, including area code: (650) 276-7040

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐ No ☒

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.  Yes ☐ No ☒

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☒ No ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files).  Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☒ No ☐

The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the common stock of the Company on the NYSE Stock Market as of the last business day of the Registrant’s most recently completed second fiscal quarter, June 30, 2022, was $296,336,350.

The number of shares of Registrant’s Common Stock outstanding as of March 30, 2023 was 9,564,001.

Table of Contents

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CERTAIN TERMS

References in this Annual Report on Form 10-K (the “Annual Report”) to “we,” “us,” “our”, “GigCapital5” or the “Company” refer to GigCapital5, Inc. References to our “management” or our “management team” refer to our officers and directors. References to the “Sponsor” or “Founder” refer to GigAcquisitions5, LLC. References to the “Insiders” refer to Mr. Weightman, our Treasurer and Chief Financial Officer, and Interest Solutions, LLC, a Connecticut limited liability company and an affiliate of ICR, LLC, an investor relations firm providing services to the Company. References to “Initial Stockholders” refer to the Founder together with the Insiders. References to “Founder Shares” refer to the initial shares of common stock purchased by the Founder. References to “Insider Shares” refer to shares of common stock granted to the Insiders.  References to “Private Placement Units” refer to the units sold to the Founder in a private placement closed concurrently with the initial public offering of the Company. References to “Working Capital Note” refer to the convertible, non-interest bearing, unsecured promissory note the Company issued to the Sponsor. The following discussion and analysis of the Company’s financial condition and results of operations should be read in conjunction with the financial statements and the notes thereto contained elsewhere in this Annual Report. Certain information contained in the discussion and analysis set forth below includes forward-looking statements that involve risks and uncertainties.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report includes “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) that are not historical facts, and involve risks and uncertainties that could cause actual results to differ materially from those expected and projected. All statements, other than statements of historical fact included in this Annual Report including, without limitation, statements in this “Management’s Discussion and Analysis of Financial Condition and Results of Operations” regarding the Company’s financial position, business strategy and the plans and objectives of management for future operations, are forward-looking statements. Words such as “expect,” “believe,” “anticipate,” “intend,” “estimate,” “seek” and variations and similar words and expressions are intended to identify such forward-looking statements. Such forward-looking statements relate to future events or future performance, but reflect management’s current beliefs, based on information currently available. A number of factors could cause actual events, performance or results to differ materially from the events, performance and results discussed in the forward-looking statements. Actual results and stockholders’ value will be affected by a variety of risks and factors, including, without limitation, international, national and local economic conditions, merger, acquisition and business combination risks, financing risks, geo-political risks, acts of terror or war, and those risk factors described under “Item 1A. Risk Factors.” Many of the risks and factors that will determine these results and stockholders’ value are beyond the Company’s ability to control or predict. Except as expressly required by applicable securities law, the Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.

All such forward-looking statements speak only as of the date of this Annual Report. The Company expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company’s expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based. All subsequent written or oral forward-looking statements attributable to us or persons acting on the Company’s behalf are qualified in their entirety by this Special Note Regarding Forward-Looking Statements.

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PART I

Item 1. Business.

Introduction

We are a Delaware corporation formed for the purpose of effecting a merger, share exchange, asset acquisition, stock purchase, reorganization, recapitalization or other similar business combination with one or more businesses, which we refer to throughout this Annual Report as our initial business combination. On December 8, 2022, the Company entered into a business combination agreement with QT Imaging, Inc., a Delaware corporation (“QT Imaging”), a medical device company engaged in the research, development and commercialization of innovative body imaging systems using low energy sound, for the Company’s initial business combination. Upon consummation of the business combination with QT Imaging, we expect to change our name and be known as QT Imaging Holdings, Inc.

We seek to capitalize on the significant experience and contacts of our management team to complete our initial business combination. We believe our management team’s distinctive background and record of acquisition and operational success could have a transformative impact on verified target businesses.

Our management team has significant hands-on experience helping companies optimize their existing and new growth initiatives. We intend to apply a unique “Mentor-Investor” philosophy to partner with QT Imaging where we will offer financial, operational and executive mentoring in order to accelerate its growth and development from a privately held entity to a publicly traded company. Further, we intend to share best practices and key learnings, gathered from our management team’s operating and investing experience, as well as strong relationships in the advanced medical equipment industries to help shape corporate strategies. Additionally, our management team has operated and invested in leading global advanced medical equipment companies across their corporate life cycles, and has developed deep relationships with key large multi-national organizations and investors. We believe that these relationships and our management team’s know-how present a significant opportunity to help drive strategic dialogue, access new customer relationships and achieve global ambitions following the completion of our initial business combination. We believe that we are providing an interesting alternative investment opportunity that capitalizes on key trends impacting the capital markets for advanced medical equipment companies.

Business Strategy

Our business strategy is to identify and complete our initial business combination with a company that complements the experience of our management team and can benefit from our management team’s operational expertise. Our selection process leverages our management team’s broad and deep relationship network and unique technology, media and telecommunications (“TMT”), aerospace and defense (“A&D”), advanced medical equipment, intelligent automation and sustainable industries expertise, including proven deal-sourcing and structuring capabilities, to provide us with a multitude of business combination opportunities. Our management team has experience:

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Business Combination

As set forth below and in the Current Report on Form 8-K filed with the Securities Exchange Commission (the “SEC”) dated December 12, 2022, the Company executed a Business Combination Agreement (the “Business Combination Agreement”), dated as of December 8, 2022, with QTI Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of GigCapital5 (“Merger Sub”), and QT Imaging (the transactions contemplated by the Business Combination Agreement, the “Business Combination”). Consistent with our strategy, we have identified and used general criteria and guidelines that we believe are important in evaluating the target’s business, and we conducted a thorough due diligence review that encompassed, among other things, meetings with incumbent management and employees, documenting reviews and inspection of facilities, as applicable, as well as a review of financial and other information.

The Merger

Pursuant to the terms of the Business Combination Agreement, Merger Sub will merge with and into QT Imaging (the “Merger”), with QT Imaging as the surviving company in the Merger (the “Surviving Corporation”), and after giving effect to the Merger, the Surviving Corporation will be a wholly owned subsidiary of GigCapital5, which will be renamed as QT Imaging Holdings, Inc. (“QTI Holdings” or the “Combined Company”).

Subject to the terms of the Business Combination Agreement, at the effective time of the Merger (the “Effective Time”), each issued and outstanding share of the common stock of QT Imaging, par value $0.001 per share (the “QT Imaging Common Stock”) (excluding each share of QT Imaging Common Stock held in the treasury of QT Imaging which will be cancelled without any conversion of such shares of QT Imaging Common Stock held in the treasury and dissenting shares) will be automatically cancelled and converted into (A) the right to receive a number of shares of common stock, par value $0.0001 per share, of GigCapital5 (the “GigCapital5 Common Stock”) calculated based on the Exchange Ratio (as defined below) and (B) the contingent right to receive a portion of additional shares of GigCapital5 Common Stock based on the performance of the Combined Company if certain requirements are achieved in accordance with the terms of the Business Combination Agreement, if, as and when payable. The “Exchange Ratio” means the quotient of (a) the Aggregate Closing Merger Consideration (as defined in the Business Combination Agreement) divided by (b) the QT Imaging Fully Diluted Capital Stock (as defined in the Business Combination Agreement). In addition, at the Effective Time, certain warrants of QT Imaging to purchase QT Imaging Common Stock will be converted into a warrant to acquire a number of shares of GigCapital5 Common Stock at an adjusted exercise price per share.

The GigCapital5 public units, each comprised of one share of GigCapital5 Common Stock and one GigCapital5 warrant to purchase shares of GigCapital5 Common Stock, are currently listed on the New York Stock Exchange (the “NYSE”) under the symbols “GIA.U,” “GIA” and “GIA.WS,” respectively. We intend to apply for listing of the common stock of the Combined Company and the warrants of the Combined Company on the NYSE under the symbols “QTI” and “QTI.WS,” respectively, upon the closing.

At the Effective Time, each outstanding in-the-money QT Imaging warrant that is not exercised and exchanged prior to the Effective Time will automatically, without any action on the part of the holder of an in-the-money QT Imaging warrant, in accordance with the provisions of an in-the-money QT Imaging warrant, be converted into a warrant to acquire a number of shares of GigCapital5 Common Stock at an adjusted exercise price per share (each such resulting warrant, an “Assumed Warrant”). Each Assumed Warrant will be subject to the same terms and conditions as were applicable to such corresponding in-the-money QT Imaging warrant immediately prior to the Effective Time (including applicable vesting conditions), except to the extent such terms or conditions are rendered

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inoperative by the transactions. Accordingly, as of the Effective Time: (A) each such Assumed Warrant will be exercisable solely for shares of GigCapital5 Common Stock; (B) the number of shares of GigCapital5 Common Stock subject to each Assumed Warrant will be determined by multiplying the number of shares of Company common stock subject to such in-the-money QT Imaging warrant, as in effect immediately prior to the Effective Time, by the per share merger consideration, and rounding the resulting number down to the nearest whole number of shares of GigCapital5 Common Stock; (C) the per share exercise price for the GigCapital5 Common Stock issuable upon exercise of each Assumed Warrant will be determined by dividing the per share exercise price for the shares of company common stock subject to the in-the-money QT Imaging warrant, as in effect immediately prior to the Effective Time, by the per share merger consideration, and rounding the resulting exercise price up to the nearest whole cent; and (D) the holder of each in-the-money QT Imaging warrant outstanding as of immediately prior to the Effective Time will be entitled to the contingent right to receive a portion of the merger consideration earnout shares, if, as and when payable. At the Effective Time, each company warrant (other than any in-the-money QT Imaging warrant) that is outstanding immediately prior to the Effective Time, whether vested or unvested, will, in accordance with the provisions of such company warrant (for the avoidance of doubt, as may be amended following the date of this current report with the written approval of GigCapital5), be canceled without any conversion of such company warrant and no payment or distribution will be made, and the holder of such company warrant will cease to have any rights, with respect to such company warrant.

Further, prior to the Effective Time, QT Imaging will, in a manner acceptable to GigCapital5, take such actions as are necessary to terminate each QT Imaging option that is outstanding immediately prior to the Effective Time, whether vested or unvested, including by payment or in accordance with the terms of the QT Imaging option plan, the company options will be terminated without any conversion of such company options and no payment or distribution will be made, and the holder of any company options will cease to have any rights, with respect to such company options.

At the Effective Time, the board of directors of QT Imaging Holdings (the “QTI Holdings Board”) will consist of seven directors in a classified board of directors with three classes, the initial members of which (the “Initial Post-Closing QTI Holdings Directors”) will consist of three individuals identified by GigCapital5 who will serve either in Class I or Class III, and will include the chairman of the QTI Holdings Board, and four individuals identified by QT Imaging who will serve in either Class I, Class II or Class III, and will include the Chief Executive Officer of QT Imaging.

Incentive Plans

In connection with the Merger, the parties will cooperate to establish, prior to the Effective Time an equity incentive award plan (the “Equity Plan”) for QTI Holdings with an award pool of GigCapital5 Common Stock equal to (i) eleven percent of the fully diluted shares of GigCapital5 Common Stock outstanding as of immediately after the Effective Time (rounded up to the nearest whole share) (the “Initial Equity Plan Pool”), which Equity Plan will include an “evergreen” provision pursuant to which such award pool will automatically increase on each January 1st that occurs within the ten year period following stockholder approval of such plan by an amount equal to five percent of the shares of GigCapital5 Common Stock outstanding as of 12:01 a.m. (Pacific Time) on such date, and which Equity Plan will be effective at and after the Effective Time. The parties expect that up to twenty-five percent of the Initial Equity Plan Pool would be reserved for issuance of awards by QTI Holdings to individuals who were employees or other service providers of QT Imaging as of the Effective Time and remain continuously employed or engaged by QTI Holdings at the time of the issuance of such awards following the Effective Time.

Approval of Extensions

The Company’s offering prospectus and Amended and Restated Certificate of Incorporation provided that the Company initially had until September 28, 2022 (the date which was 12 months after the consummation of the initial public offering (the “Offering”) to complete its initial business combination. On September 23, 2022, the Company held a special meeting of its stockholders (the “September 2022 Special Meeting”) and the Company’s stockholders approved the following proposals: (i) a proposal to amend (the “September 2022 Charter Amendment”) the Company’s Amended and Restated Certificate of Incorporation giving the Company the right to extend the date by which it has to consummate a business combination (the “Combination Period”) six (6) times for an additional one (1) month each time, from September 28, 2022 to March 28, 2023 (i.e., for a period of time ending 18 months from the consummation of its Offering) and (ii) a proposal to amend the Company’s investment management trust

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agreement, dated as of September 23, 2021 (the “September 2022 Trust Agreement”), by and between the Company and Continental Stock Transfer & Trust Company, allowing the Company to extend the Combination Period six (6) times for an additional one (1) month each time from September 28, 2022 to March 28, 2023 by depositing into the trust account for each one-month extension $160,000. The purpose of the September 2022 Charter Amendment and the September 2022 Trust Amendment is to allow the Company more time to complete its initial business combination. In connection with the September 2022 Special Meeting, the Company’s stockholders elected to redeem 18,985,950 shares of the Company’s common stock, which represented approximately 82.5% of the shares that were part of the public units sold in the Offering. Following such redemptions, $192,138,312 was withdrawn from the trust account on September 27, 2022.

On March 28, 2023, the Company held a second special meeting of its stockholders (the “March 2023 Special Meeting”) and the Company’s stockholders approved the following proposals: (i) a proposal to amend (the “March 2023 Charter Amendment”) the Company’s Amended and Restated Certificate of Incorporation giving the Company the right to extend the date by which it has to consummate a business combination (the “Combination Period”) six (6) times for an additional one (1) month each time, from March 28, 2023 to September 28, 2023 (i.e., for a period of time ending 24 months from the consummation of its initial public offering and (ii) a proposal to amend the Company’s investment management trust agreement, dated as of September 23, 2021 (the “March 2023 Trust Agreement”), by and between the Company and Continental Stock Transfer & Trust Company, allowing the Company to extend the Combination Period six (6) times for an additional one (1) month each time from March 28, 2023 to September 28, 2023 by depositing $100,000 into the trust account for each one-month extension. The purpose of the March 2023 Charter Amendment and the March 2023 Trust Amendment is to allow the Company more time to complete its initial business combination. In connection with the March 2023 Special Meeting, the Company’s stockholders elected to redeem 995,049 shares of the Company’s common stock, which represented approximately 4.3% of the shares that were part of the public units sold in the Offering. Following such redemptions, $10,449,626 is being withdrawn from the trust account.

First Extension

On September 26, 2022, the Company issued an unsecured, non-interest-bearing promissory note (the “Extension Note”) to the Sponsor for a principal amount of $160,000. The proceeds from the Extension Note were deposited into the trust account in accordance with the terms of the Company’s Amended and Restated Certificate of Incorporation. The Extension Note matures on the earlier of the date on which the Company consummates its initial business combination or the date the Company winds up and may be prepaid without penalty.

Second Extension

On October 26, 2022, the Company further amended and restated the Extension Note (the “First Restated Extension Note”) to reflect an additional principal amount of $160,000 for a collective principal amount under the First Restated Extension Note of $320,000. The Sponsor deposited such funds into the Company’s trust account with Continental Stock Transfer & Trust Company.

Third Extension

On November 28, 2022, the Company further amended and restated the First Restated Extension Note (the “Second Restated Extension Note”) to reflect an additional principal amount of $160,000 for a collective principal amount under the Second Restated Extension Note of $480,000. The Sponsor deposited such funds into the Company’s trust account with Continental Stock Transfer & Trust Company.

Fourth Extension

On December 27, 2022, the Company further amended and restated the Second Restated Extension Note (the “Third Restated Extension Note”) to reflect an additional principal amount of $160,000 for a collective principal amount under the Third Restated Extension Note of $640,000. The Sponsor deposited the additional principal amount of $160,000 into the Company’s trust account with Continental Stock Transfer & Trust Company.

Fifth Extension

On January 26, 2023, the Company further amended and restated the Third Restated Extension Note (the “Fourth

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Restated Extension Note”) to reflect an additional principal amount of $160,000 for a collective principal amount under the Fourth Restated Extension Note of $800,000. The Sponsor deposited the additional principal amount of $160,000 into the Company’s trust account with Continental Stock Transfer & Trust Company.

Sixth Extension

On February 27, 2023, the Company further amended and restated the Fourth Restated Extension Note (the “Fifth Restated Extension Note”) to reflect an additional principal amount of $160,000 for a collective principal amount under the Fifth Restated Extension Note of $960,000. The Sponsor deposited the additional principal amount of $160,000 into the Company’s trust account with Continental Stock Transfer & Trust Company.

Seventh Extension

On March 28, 2023, following the approval of the March 2023 Charter Amendment and the March 2023 Trust Amendment, the Company further amended and restated the Fifth Restated Extension Note (the “Sixth Restated Extension Note”) to reflect an additional principal amount of $100,000 for a collective principal amount under the Sixth Restated Extension Note of $1,060,000. The Sponsor deposited the additional principal amount of $100,000 into the Company’s trust account with Continental Stock Transfer & Trust Company.

Working Capital Loans

On September 26, 2022, the Company issued a convertible, non-interest bearing, unsecured promissory note (the “Working Capital Note”) to the Sponsor for a principal amount of $65,000. The Working Capital Note was subsequently amended and restated six more times on October 26, 2022 (an additional $65,000 added to the Working Capital Note), November 28, 2022 (an additional $65,000 added to the Working Capital Note), December 27, 2022 (an additional $65,000 added to the Working Capital Note), January 25, 2023 (an additional $65,000 added to the Working Capital Note), February 27, 2023 (an additional $350,000 added to the Working Capital Note) and March 28, 2023 (an additional $130,000 added to the Working Capital Note), respectively, for a collective principal amount of $805,000. The Working Capital Note was issued to provide the Company with additional working capital during the Extension and was not deposited into the Trust Account. The Working Capital Note is convertible at the Sponsor’s election upon the consummation of the initial business combination. Upon such election, the convertible note will convert, at a price of $10.00 per unit, into units identical to the Private Placement Units issued in connection with the Offering. An aggregate of 80,500 Private Placement Units of the Company would be issued if the entire principal balance of the Working Capital Note is converted. Each Private Placement Unit consists of one share of the Company’s common stock, par value $0.0001 per share, and one redeemable warrant. The warrants constituting a part of the Private Placement Units would be exercisable, subject to the terms and conditions of the warrant and during the exercise period as provided in the warrant agreement governing the warrants. The Company has relied upon Section 4(a)(2) of the Securities Act, in connection with the issuance and sale of the convertible promissory note, as it was issued to a sophisticated investor without a view to distribution and was not issued through any general solicitation or advertisement.

PIPE Subscription Agreement

Prior to the Effective Time, GigCapital5 may enter into agreements with investors (the private investment in public equity (the "PIPE") and “PIPE Investors”) for the subscription for GigCapital5 Common Stock, convertible promissory notes or other securities or any combination of such securities to be subscribed for pursuant to the terms of one or more subscription agreements (all such subscription agreements, collectively the “PIPE Subscription Agreements”) on terms and conditions mutually agreeable to GigCapital5 and QT Imaging (such agreement not to be unreasonably withheld, conditioned or delayed), provided that, unless otherwise agreed to, the aggregate gross proceeds under the PIPE Subscription Agreements will target $26,000,000 (the “PIPE Investment Amount”). As of the date of this Annual Report, there are no PIPE Subscription Agreements in place. The consummation of the Business Combination is subject to the receipt of the requisite approval of the stockholders of each of GigCapital5 and QT Imaging, and the fulfillment of certain other conditions, as described in greater detail this Form 10-K.

Lack of Business Diversification

For an indefinite period of time after consummation of our initial business combination, the prospects for our

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success may depend entirely on the future performance of a single business. Unlike other entities that have the resources to complete business combinations with multiple entities in one or several industries, it is probable that we will not have the resources to diversify our operations and mitigate the risks of being in a single line of business. By consummating our initial business combination with only a single entity, our lack of diversification may:

Stockholders May Not Have the Ability to Approve Our Business Combination

In connection with any proposed Business Combination, we will either (1) seek stockholder approval of our initial business combination at a meeting called for such purpose at which stockholders may seek to convert their shares, regardless of whether they vote for or against the proposed Business Combination, into their pro rata share of the aggregate amount then on deposit in the trust account, including interest (which interest shall be net of taxes payable), or (2) provide our stockholders with the opportunity to sell their shares to us by means of a tender offer (and thereby avoid the need for a stockholder vote) for an amount equal to their pro rata share of the aggregate amount then on deposit in the trust account (net of taxes payable), in each case subject to the limitations described herein.

We will seek stockholder approval if it is required by applicable law or stock exchange listing requirement, provided that we may also decide to seek stockholder approval for business or other reasons.

Under the rules of the NYSE, stockholder approval would be required for our initial business combination if, for example:

The proposed Business Combination with QT Imaging will be required by the above-referenced rules to be approved by our stockholders at a meeting called for such purpose. Approval of the proposed Business Combination will require the affirmative vote (in person or by proxy) of the holders of a majority of the shares of our common stock entitled to vote thereon and actually cast at the stockholders’ meeting, voting as a single class. The Sponsor is entitled to vote an aggregate of 6,530,000 shares of our common stock, which constitutes a majority of our common stock. Concurrently with the execution of the Business Combination Agreement, the Sponsor entered into a Sponsor Support Agreement with the Company and QT Imaging, pursuant to which the Sponsor agreed, at any meeting of our stockholders and in connection with any action by written consent of our stockholders, to (i) appear or cause all shares or other voting securities of us that it holds, owns, or is entitled to vote, whether as shares or as a constituent part of a unit of securities to be counted present for quorum purposes, (ii) vote (or execute an action by written consent) or cause to be voted (A) in favor of the Business Combination Agreement, the Merger, and any other transactions contemplated by the Business Combination Agreement, (B) against any action, agreement or transaction or proposal that would result in a breach of the Business Combination Agreement or that would reasonably be expected to result in a failure to consummate the Merger, (C) in favor of the proposals and any other matters necessary or reasonably requested by us for the consummation of the proposed Business Combination, (D) against any business combination proposal other than with QT Imaging and any other action that would reasonably be expected to materially impede,

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delay, or adversely affect the proposed Business Combination or result in a breach of any obligation or agreement of the Sponsor contained in the Sponsor Support Agreement.

If we determine to engage in a tender offer, such tender offer will be structured so that each stockholder may tender any or all of his, her or its shares rather than some pro rata portion of his, her or its shares. The decision as to whether we will seek stockholder approval of a proposed business combination or will allow stockholders to sell their shares to us in a tender offer will be made by us, solely in our discretion, and will be based on business and legal reasons, which include a variety of factors, including, but not limited to:

Unlike other blank check companies which require stockholder votes and conduct proxy solicitations in conjunction with their initial business combination and related conversions of public shares for cash upon consummation of such initial business combination even when a vote is not required by law, we will have the flexibility to avoid such stockholder vote and allow our stockholders to sell their shares pursuant to Rule 13e-4 and Regulation 14E of the Exchange Act which regulate issuer tender offers. In that case, we will file tender offer documents with the SEC, which will contain substantially the same financial and other information about the initial business combination as is required under the SEC’s proxy rules. We will consummate our initial business combination only if we have net tangible assets of at least $5,000,001 upon such consummation and, if we seek stockholder approval, the affirmative vote of the holders of a majority of the shares of common stock that are voted at a stockholder meeting held to consider the initial business combination.

We chose our net tangible asset threshold of $5,000,001 to ensure that we would avoid being subject to Rule 419 promulgated under the Securities Act. However, if we seek to consummate an initial business combination with a target business that imposes any type of working capital closing condition or requires us to have a minimum amount of funds available from the trust account upon consummation of such initial business combination, we may need to have more than $5,000,001 in net tangible assets upon consummation and this may force us to seek third party financing which may not be available on terms acceptable to us or at all. As a result, we may not be able to consummate such initial business combination and we may not be able to locate another suitable target within the applicable time period, if at all. Public stockholders may therefore have to wait until after September 28, 2023 in order to be able to receive a pro rata share of the trust account.

Redemption Rights

At the meeting called to approve our initial business combination, public stockholders (but not our Founders or management team) may seek to redeem their shares of common stock, regardless of whether they vote for or against the proposed business combination, by converting such shares into their pro rata share of the aggregate amount then on deposit in the trust account as of two business days prior to the consummation of the initial business combination, less any taxes then due but not yet paid (which taxes may be paid only from the interest earned on the funds in the trust account). Alternatively, we may provide our public stockholders (but not our Founder or management team) with the opportunity to sell their shares of common stock to us through a tender offer (and thereby avoid the need for a stockholder vote) for an amount equal to their pro rata share of the aggregate amount then on deposit in the trust account, less any taxes then due but not yet paid.

We may also require public stockholders seeking redemption, whether they are a record holder or hold their shares in “street name,” to either (i) tender their certificates to our transfer agent or (ii) deliver their shares to the transfer agent electronically using Depository Trust Company’s (“DTC”) DWAC (Deposit/Withdrawal At Custodian)

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System, at the holder’s option, in each case prior to a date set forth in the proxy materials sent in connection with the proposal to approve the proposed Business Combination.

There is a nominal cost associated with the above-referenced delivery process and the act of certificating the shares or delivering them through the DWAC System. The transfer agent will typically charge the tendering broker $45.00 and it would be up to the broker whether or not to pass this cost on to the holder. This fee would be incurred regardless of whether or not we require holders seeking to exercise redemption rights to do so prior to the time that we know that the proposed Business Combination will be consummated. The need to deliver shares is a requirement of exercising redemption rights regardless of the timing of when such delivery must be effectuated. Thus, in the event we require stockholders seeking to exercise redemption rights to deliver their shares prior to the consummation of the proposed Business Combination and the proposed Business Combination is not consummated, this may result in an increased cost to stockholders.

Any proxy solicitation materials we furnish to stockholders in connection with a vote for any proposed business combination will indicate whether we are requiring stockholders to satisfy such certification and delivery requirements. Accordingly, a stockholder would have from the time the stockholder received our proxy statement up until the time designated in the proxy statement to deliver his, her or its shares if he, she or it wishes to seek to exercise his, her or its redemption rights. This time period varies depending on the specific facts of each transaction. However, as the delivery process can be accomplished by the stockholder, whether or not he, she or it is a record holder or his shares are held in “street name,” in a matter of hours by simply contacting the transfer agent or his, her or its broker and requesting delivery of his, her or its shares through the DWAC System, we believe this time period is sufficient for an average investor. However, we cannot assure you of this fact. Please see the risk factor titled “We will require public stockholders who wish to redeem their shares of common stock in connection with a proposed business combination to comply with specific requirements for redemption that may make it more difficult for them to exercise their redemption rights prior to the deadline for exercising their rights” for further information on the risks of failing to comply with these requirements.

The foregoing is different from the procedures historically used by some blank check companies. Traditionally, in order to perfect redemption rights in connection with a blank check company’s business combination, the company would distribute proxy materials for the stockholders’ vote on an initial business combination, and a holder could simply vote against a proposed business combination and check a box on the proxy card indicating such holder was seeking to exercise his, her or its redemption rights. After the business combination was approved, the company would contact such stockholder to arrange for him, her or it to deliver his, her or its certificate to verify ownership. As a result, the stockholder then had an “option window” after the consummation of the business combination during which he, she or it could monitor the price of the company’s stock in the market. If the price rose above the conversion price, he could sell his, her or its shares in the open market before actually delivering his, her or its shares to the company for cancellation. As a result, the redemption rights, to which stockholders were aware they needed to commit before the stockholder meeting, would become a “continuing” right surviving past the consummation of the business combination until the holder delivered his, her or its certificate or shares. The requirement for physical or electronic delivery prior to the meeting ensures that a holder’s election to convert his, her or its shares is irrevocable once the business combination is approved.

Any request to redeem such shares once made, may be withdrawn at any time up to the vote on the proposed business combination. Furthermore, if a holder of a public share delivered his, her or its certificate or shares in connection with an election of such shares’ redemption and subsequently decides prior to the vote on the proposed business combination not to elect to exercise such rights, he, she or it may simply request that the transfer agent return the certificate or shares (physically or electronically).

If our initial business combination is not approved or completed for any reason, then our public stockholders who elected to exercise their redemption rights would not be entitled to redeem their shares for the applicable pro rata share of the trust account as of two business days prior to the consummation of the initial business combination. In such case, we will promptly return any certificates or shares delivered by public holders. Furthermore, if our initial business combination is not approved or completed for any reason, then our public stockholders who elected to exercise their redemption rights will not be entitled to convert their shares into a full pro rata portion of the trust account, as applicable. We will thereafter promptly return any shares delivered by public stockholders. In such case, public stockholders may only share in the assets of the trust account upon our liquidation. This may result in public

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stockholders receiving less than they would have received if our initial business combination was completed and they had exercised redemption rights in connection therewith due to potential claims of creditors. If we would be left with less than $5,000,001 of net tangible assets as a result of the holders of public shares properly demanding redemption of their shares, we will likely be unable to consummate an initial business combination.

Liquidation if No Business Combination

If we have not completed an initial business combination by the date required by our Amended and Restated Certificate of Incorporation, we will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem 100% of the outstanding public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, including any interest earned on the funds held in the trust account and net of interest that may be used to pay our franchise and income taxes payable, and less up to $100,000 of interest to pay dissolution expenses, divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of our remaining stockholders and our Board of Directors, dissolve and liquidate, subject (in the case of (ii) and (iii) above) to our obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law.

Our Founder and management team have agreed that they will not propose any amendment to our Amended and Restated Certificate of Incorporation that would stop our public stockholders from converting or selling their shares of common stock to us in connection with a business combination or affect the substance or timing of our obligation to redeem 100% of our public shares if we do not complete a business combination by September 28, 2023; provided that at the beginning of each one-month extension, our Sponsor (or its designees) must deposit into the trust account $160,000 for each one-month extension through February 28, 2023 and $100,000 thereafter for each one-month extension of the time period to complete our initial business combination, in each case, in exchange for a non-interest bearing, unsecured promissory note, unless we provide our public stockholders with the opportunity to redeem their shares of common stock upon such approval at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, net of franchise and income taxes payable, divided by the number of then outstanding public shares. This redemption right shall apply in the event of the approval of any such amendment, whether proposed by our Founders, any executive officer, director or director nominee, or any other person.

Under the Delaware General Corporation law (“DGCL”), stockholders may be held liable for claims by third parties against a corporation to the extent of distributions received by them in a dissolution. The pro rata portion of our trust account distributed to our public stockholders upon the redemption of 100% of our outstanding public shares in the event we do not complete our initial business combination within the required time period may be considered a liquidation distribution under Delaware law. If the corporation complies with certain procedures set forth in Section 280 of the DGCL intended to ensure that it makes reasonable provision for all claims against it, including a 60-day notice period during which any third-party claims can be brought against the corporation, a 90‑day period during which the corporation may reject any claims brought, and an additional 150-day waiting period before any liquidating distributions are made to stockholders, any liability of stockholders with respect to a liquidating distribution is limited to the lesser of such stockholder’s pro rata share of the claim or the amount distributed to the stockholder, and any liability of the stockholder would be barred after the third anniversary of the dissolution.

Furthermore, if the pro rata portion of our trust account distributed to our public stockholders upon the redemption of 100% of our public shares in the event we do not complete our initial business combination within the required time period is not considered a liquidation distribution under Delaware law and such redemption distribution is deemed to be unlawful, then pursuant to Section 174 of the DGCL, the statute of limitations for claims of creditors could then be six years after the unlawful redemption distribution, instead of three years, as in the case of a liquidation distribution. However, if we are unable to complete a business combination within the prescribed time frame, we will proceed as provided for in our Amended and Restated Certificate of Incorporation as described above. Accordingly, it is our intention to redeem our public shares as soon as reasonably possible following the expiration of the time periods described above and, therefore, we do not intend to comply with the procedures required by Section 280 of the DGCL, which would limit the amount and duration of our stockholders’ liability with respect to liquidating distributions as described above. As such, our stockholders could potentially be liable for any claims to the extent of

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distributions received by them (but no more) and any liability of our stockholders may extend well beyond the third anniversary of such date.

Because we will not be complying with Section 280 of the DGCL, Section 281(b) of the DGCL requires us to adopt a plan, based on facts known to us at such time that will provide for our payment of all existing and pending claims or claims that may be potentially brought against us within the subsequent ten years. However, because we are a blank check company, rather than an operating company, and our operations will be limited to searching for prospective target businesses to acquire, the only likely claims to arise would be from our vendors (such as lawyers, investment bankers, etc.) or prospective target businesses.

We anticipate notifying the trustee of the trust account to begin liquidating such assets promptly after such date and anticipate it will take no more than ten business days to effectuate such distribution. Our Founders and management team have waived their rights to participate in any liquidation distribution with respect to the Founder Shares and the shares of common stock underlying the Private Placement Units. There will be no distribution from the trust account with respect to our warrants or rights, which will expire worthless. We will pay the costs of any subsequent liquidation from our remaining assets outside of the trust account and the interest earned on the funds held in the trust account that we are permitted to withdraw to pay such expenses.

If we are unable to complete an initial business combination and expend all of the net proceeds of the Offering, other than the proceeds deposited in the trust account, and without taking into account interest, if any, earned on the trust account, the initial per-share redemption price would be $10.37 in principal plus accrued interest net of franchise and income taxes. The proceeds deposited in the trust account could, however, become subject to claims of our creditors that are in preference to the claims of public stockholders.

Our public stockholders shall be entitled to receive funds from the trust account only in the event of our failure to complete a business combination within the required time period or if the stockholders seek to have us redeem or purchase their respective shares upon a business combination which is actually completed by us or upon certain amendments to our Amended and Restated Certificate of Incorporation as described elsewhere herein. In no other circumstances shall a stockholder have any right or interest of any kind to or in the trust account.

Our Founder, management team and the underwriters will not participate in any redemption distribution from our trust account with respect to their Founder Shares, Insider Shares and Private Placement Units. Additionally, any loans made by our officers, directors, sponsors or their affiliates for working capital needs will be forgiven and not repaid if we are unable to complete an initial business combination.

If we are forced to file a bankruptcy case or an involuntary bankruptcy case is filed against us which is not dismissed, the proceeds held in the trust account could be subject to applicable bankruptcy law, and may be included in our bankruptcy estate and subject to the claims of third parties with priority over the claims of our stockholders. To the extent any bankruptcy claims deplete the trust account, we cannot make any assurance of the amount we will be able to return to our public stockholders.

If we are forced to file a bankruptcy case or an involuntary bankruptcy case is filed against us which is not dismissed, any distributions received by stockholders could be viewed under applicable debtor/creditor and/or bankruptcy laws as either a “preferential transfer” or a “fraudulent conveyance.” As a result, a bankruptcy court could seek to recover all amounts received by our stockholders. Furthermore, because we intend to distribute the proceeds held in the trust account to our public stockholders promptly after September 28, 2023; provided that at the beginning of each one-month extension, our Sponsor (or its designees) must deposit into the trust account $160,000 for each one-month extension through February 28, 2023 and $100,000 thereafter for each one-month extension of the time period to complete our initial business combination, (in each case, in exchange for a non-interest bearing, unsecured promissory note), this may be viewed or interpreted as giving preference to our public stockholders over any potential creditors with respect to access to or distributions from our assets. Furthermore, our board may be viewed as having breached their fiduciary duties to our creditors and/or may have acted in bad faith, and thereby exposing itself and our company to claims of punitive damages, by paying public stockholders from the trust account prior to addressing the claims of creditors. We cannot assure you that claims will not be brought against us for these reasons.

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Amended and Restated Certificate of Incorporation

Our Amended and Restated Certificate of Incorporation contains certain requirements and restrictions that will apply to us until the consummation of our initial business combination. These provisions cannot be amended without the approval of at least a majority of our outstanding common stock. If we seek to amend any provisions of our Amended and Restated Certificate of Incorporation that would stop our public stockholders from converting or selling their shares to us in connection with a business combination or affect the substance or timing of our obligation to redeem 100% of our public shares if we do not complete a business combination by September 28, 2023; provided that at the beginning of each one-month extension, our Sponsor (or its designees) must deposit into the trust account $160,000 for each one-month extension through February 28, 2023 and $100,000 thereafter for each one-month extension of the time period to complete our initial business combination, (in each case, in exchange for a non-interest bearing, unsecured promissory note), we will provide dissenting public stockholders with the opportunity to redeem their public shares in connection with any such vote. This redemption right shall apply in the event of the approval of any such amendment, whether proposed by our Founders, any executive officer, director or director nominee, or any other person. Our Founders and management team have agreed to waive any redemption rights with respect to any common stock held by them, including any public shares they may hold, in connection with any vote to amend our Amended and Restated Certificate of Incorporation. Specifically, our Amended and Restated Certificate of Incorporation provides, among other things, that:

Competition

We expect to encounter intense competition from entities other than blank check companies having a business objective similar to ours, including private equity groups, venture capital funds, leveraged buyout funds and operating businesses competing for acquisitions. Many of these entities are well established and have extensive experience in identifying and effecting business combinations directly or through affiliates. Many of these competitors possess greater technical, human and other resources than we do and our financial resources will be relatively limited when contrasted with those of many of these competitors. Therefore, our ability to compete in acquiring certain sizable target businesses may be limited by our available financial resources.

The following also may not be viewed favorably by certain target businesses:

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Any of these factors may place us at a competitive disadvantage in successfully negotiating a business combination. Our management believes, however, that our status as a public entity and potential access to the United States public equity markets may give us a competitive advantage over privately-held entities having a similar business objective as ours in acquiring a target business with significant growth potential on favorable terms.

If we succeed in effecting a business combination, there will be, in all likelihood, intense competition from competitors of the target business. We cannot assure you that, subsequent to a business combination, we will have the resources or ability to compete effectively.

Employees

We have three executive officers. These individuals are not obligated to devote any specific number of hours to our matters and intend to devote only as much time as they deem necessary to our affairs. The amount of time they will devote in any time period will vary based on whether a target business has been selected for the business combination and the stage of the business combination process the Company is in. Accordingly, once a suitable target business to acquire has been located, management will spend more time investigating such target business and negotiating and processing the business combination (and consequently spend more time on our affairs) than had been spent prior to locating a suitable target business. We presently expect our executive officers to devote such amount of time as they reasonably believe is necessary to our business. We do not intend to have any full-time employees prior to the consummation of a business combination.

Periodic Reporting and Financial Information

We have registered our units, common stock and warrants under the Exchange Act and have reporting obligations, including the requirement that we file annual, quarterly and current reports with the SEC. In accordance with the requirements of the Exchange Act, this Annual Report contains financial statements audited and reported on by our independent registered public accountants.

We will provide stockholders with audited financial statements of the prospective target business as part of any proxy solicitation materials or tender offer documents sent to stockholders to assist them in assessing the target business. These financial statements will need to be prepared in accordance with or reconciled to accounting principles generally accepted in the United States (“GAAP”) or international financial reporting standards, as issued by the International Accounting Standards Board (“IFRS”). We cannot assure you that any particular target business identified by us as a potential acquisition candidate will have the necessary financial statements. To the extent that this requirement cannot be met, we may not be able to acquire the proposed target business.

Section 404 of the Sarbanes-Oxley Act requires that we evaluate and report on our system of internal controls beginning with our Annual Report on Form 10-K for the year ended December 31, 2022. Our management is responsible for establishing and maintaining adequate internal control over financial reporting for the Company. Internal control over financial reporting is a process to provide reasonable assurance regarding the reliability of our financial reporting for external purposes in accordance with accounting principles generally accepted in the United States of America. Internal control over financial reporting includes maintaining records that in reasonable detail accurately and fairly reflect our transactions; providing reasonable assurance that transactions are recorded as necessary for preparation of our financial statements; providing reasonable assurance that receipts and expenditures of Company assets are made in accordance with management authorization; and providing reasonable assurance that unauthorized acquisition, use, or disposition of company assets that could have a material effect on our financial statements would be prevented or detected on a timely basis. Because of its inherent limitations, internal control over financial reporting is not intended to provide absolute assurance that a misstatement of our financial statements would be prevented or detected.

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Item 1A. Risk Factors.

An investment in our securities involves a high degree of risk. You should consider carefully all of the risks described below, together with the other information contained in this Annual Report, before making a decision to invest in our securities. If any of the following events occur, our business, financial condition and operating results may be materially adversely affected. In that event, the trading price of our securities could decline, and you could lose all or part of your investment.

The forward-looking statements contained in this Annual Report are based on our current expectations and beliefs concerning future developments and their potential effects on us. Future developments affecting us may not be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, the following risks, uncertainties and other factors:

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Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

General Risk Factors

We are a blank check company with no operating history and no revenues, and you have no basis on which to evaluate our ability to achieve our business objective.

We are a blank check company with no operating results and have only commenced operations with the completion of our Offering in September 2021. Because we lack an operating history, you have no basis upon which to evaluate our ability to achieve our business objective of completing our initial business combination with one or more target businesses. To date, our efforts have been limited to organizational activities, the Offering and the search for a business combination. We signed the Business Combination Agreement on December 8, 2022, but there is no guarantee that we will be able to complete such business combination. If we fail to complete our initial business combination, we will never generate any operating revenues.

GigCapital5 has no operating or financial history and its results of operations and those of the Combined Company may differ significantly from the unaudited pro forma financial data included in the S-4 Registration Statement (as defined below).

GigCapital5 is a blank check company and has no operating history and no revenues. The Registration Statement on Form S-4 filed with the SEC on February 14, 2023 (as may be amended, “S-4 Registration Statement”) included unaudited pro forma condensed combined financial statements for the Combined Company. The unaudited pro forma condensed combined statement of operations of the Combined Company combines the historical unaudited results of operations of GigCapital5 for the nine months ended September 30, 2022, with the historical unaudited results of operations of QT Imaging for the nine months ended September 30, 2022, respectively, and the historical audited results of operations of GigCapital5 for the period from January 19, 2021 (date of inception) through December 31, 2021, with the historical audited results of operations of QT Imaging for the year ended December 31, 2021, respectively, and gives pro forma effect to the proposed Business Combination as if it had been consummated on January 1, 2021. The unaudited pro forma condensed combined balance sheet of the Combined Company combines the historical balance sheets of GigCapital5 as of September 30, 2022 and of QT Imaging as of September 30, 2022

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and gives pro forma effect to the proposed Business Combination as if it had been consummated on September 30, 2022.

The unaudited pro forma condensed combined financial statements were presented for illustrative purposes only, were based on certain assumptions, address a hypothetical situation and reflect limited historical financial data. Therefore, the unaudited pro forma condensed combined financial statements included in the S-4 registration Statement are not necessarily indicative of the results of operations and financial position that would have been achieved had the proposed Business Combination and the acquisitions by QT Imaging been consummated on the dates indicated above, or the future results of operations or financial position of the Combined Company. Accordingly, the Combined Company’s business, assets, cash flows, results of operations and financial condition may differ significantly from those indicated by the unaudited pro forma condensed combined financial statements included in the S-4 Registration Statement.

Past performance by our management team may not be indicative of future performance of an investment in the Company.

Information regarding performance by, or businesses associated with, our management team and their affiliates, including Kaleyra, Inc., UpHealth, Inc., Lightning eMotors, Inc., and BigBear.ai Holdings, Inc., is presented for informational purposes only. Past performance by our management team, including with respect to Kaleyra, Inc., UpHealth, Inc., Lightning eMotors, Inc., and BigBear.ai Holdings, Inc., is not a guarantee either (i) that we will be able to identify a suitable candidate for our initial business combination or (ii) of success with respect to any business combination we may consummate. You should not rely on the historical record of our management team’s performance as indicative of our future performance of an investment in the company or the returns the company will, or is likely to, generate going forward.

We are an “emerging growth company” and we cannot be certain if the reduced disclosure requirements applicable to emerging growth companies will make our securities less attractive to investors.

We are an “emerging growth company” within the meaning of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS” Act), and we may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. As a result, our stockholders may not have access to certain information they may deem important. We could be an emerging growth company for up to five years, although circumstances could cause us to lose that status earlier, including if the market value of our common stock held by non-affiliates exceeds $700 million as of any June 30 before that time, in which case we would no longer be an emerging growth company as of the following January 1. We cannot predict whether investors will find our securities less attractive because we will rely on these exemptions. If some investors find our securities less attractive as a result of our reliance on these exemptions, the trading prices of our securities may be lower than they otherwise would be, there may be a less active trading market for our securities and the trading prices of our securities may be more volatile.

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. We have elected not to opt out of such extended transition period, which means that when a standard is issued or revised and it has different application dates for public or private companies, we, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make a comparison of our financial statements with another public company, unless it is an emerging growth company that has not opted out of using the extended transition period, difficult or impossible because of the potential differences in accounting standards used.

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Compliance obligations under the Sarbanes-Oxley Act may make it more difficult for us to effectuate our initial business combination, require substantial financial and management resources, and increase the time and costs of completing a business combination.

Section 404 of the Sarbanes-Oxley Act requires that we evaluate and report on our system of internal controls beginning with our Annual Report on Form 10-K for the year ended December 31, 2022. Only in the event we are deemed to be a large accelerated filer or an accelerated filer will we be required to comply with the independent registered public accounting firm attestation requirement on our internal control over financial reporting. Further, for as long as we remain an emerging growth company, we will not be required to comply with the independent registered public accounting firm attestation requirement on our internal control over financial reporting. The fact that we are a blank check company makes compliance with the requirements of the Sarbanes-Oxley Act particularly burdensome on us as compared to other public companies because a target company with which we seek to complete our business combination may not be in compliance with the provisions of the Sarbanes-Oxley Act regarding adequacy of its internal controls. The development of the internal control of any such entity to achieve compliance with the Sarbanes-Oxley Act may increase the time and costs necessary to complete any such business combination.

Provisions in our Amended and Restated Certificate of Incorporation and Delaware law may inhibit a takeover of us, which could limit the price investors might be willing to pay in the future for our common stock and could entrench management.

Our Amended and Restated Certificate of Incorporation contains provisions that may discourage unsolicited takeover proposals that stockholders may consider to be in their best interests. These provisions include the ability of our Board of Directors to designate the terms of, and issue new series of, preferred stock. We are also subject to anti-takeover provisions under Delaware law, which could delay or prevent a change of control. Together these provisions may make more difficult the removal of management and may discourage transactions that otherwise could involve payment of a premium over prevailing market prices for our securities.

Our Amended and Restated Certificate of Incorporation provides, subject to limited exceptions, that the Court of Chancery of the State of Delaware is the sole and exclusive forum for certain stockholder litigation matters, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or stockholders.

Our Amended and Restated Certificate of Incorporation requires, to the fullest extent permitted by law, that derivative actions brought in our name, actions against our directors, officers, and employees for breach of fiduciary duty and other similar actions may be brought only in the Court of Chancery in the State of Delaware and, if brought outside of Delaware, the stockholder bringing the suit will be deemed to have consented to service of process on such stockholder’s counsel except any action (A) as to which the Court of Chancery in the State of Delaware determines that there is an indispensable party not subject to the jurisdiction of the Court of Chancery (and the indispensable party does not consent to the personal jurisdiction of the Court of Chancery within ten days following such determination), (B) which is vested in the exclusive jurisdiction of a court or forum other than the Court of Chancery, (C) for which the Court of Chancery does not have subject matter jurisdiction, or (D) arising under the Securities Act, as to which the Court of Chancery and the federal district court for the District of Delaware shall have concurrent jurisdiction. Any person or entity purchasing or otherwise acquiring any interest in shares of our capital stock shall be deemed to have notice of and consented to the forum provisions in our Amended and Restated Certificate of Incorporation. This choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or any of our directors, officers, or employees which may discourage lawsuits with respect to such claims, although our stockholders will not be deemed to have waived our compliance with federal securities laws and the rules and regulations thereunder. However, there is no assurance that a court would enforce the choice of forum provision contained in our Amended and Restated Certificate of Incorporation. If a court were to find such provision to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, operating results and financial condition.

Our Amended and Restated Certificate of Incorporation provides that the exclusive forum provision will be applicable to the fullest extent permitted by applicable law. Section 27 of the Exchange Act creates exclusive federal jurisdiction over all suits brought to enforce any duty or liability created by the Exchange Act or the rules and regulations thereunder. As a result, the exclusive forum provision will not apply to suits brought to enforce any duty or liability created by the Exchange Act or any other claim for which the federal courts have exclusive jurisdiction.

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Changes in laws or regulations, or a failure to comply with any laws and regulations, may adversely affect our business, investments and results of operations.

We are subject to laws and regulations enacted by national, regional and local governments. In particular, we will be required to comply with certain SEC and other legal requirements. Compliance with, and monitoring of, applicable laws and regulations may be difficult, time consuming and costly. Those laws and regulations and their interpretation and application also may change from time to time and those changes could have a material adverse effect on our business, investments and results of operations. In addition, a failure to comply with applicable laws or regulations, as interpreted and applied, could have a material adverse effect on our business and results of operations.

We may reincorporate in another jurisdiction in connection with our initial business combination and such reincorporation may result in taxes imposed on stockholders.

Although this is not what is anticipated with respect to the Business Combination with QT Imaging, if for any reason that does not proceed, we may, in connection with our initial business combination, reincorporate in the jurisdiction in which the target company or business is located or in another jurisdiction. The transaction may require a stockholder to recognize taxable income in the jurisdiction in which the stockholder is a tax resident or in which its members are resident if it is a tax transparent entity. We do not intend to make any cash distributions to stockholders to pay such taxes. Stockholders may be subject to withholding taxes or other taxes with respect to their ownership of us after the reincorporation.

None of the underwriters or any of their respective affiliates have an obligation to provide us with potential investment opportunities or to devote any specified amount of time or support to our company’s business.

None of the underwriters or any of their respective affiliates have any legal or contractual obligation to seek on our behalf or to present to us investment opportunities that might be suitable for our business, and may allocate any such opportunities at their discretion to us or other parties. We have no investment management, advisory, consulting or other agreement in place with the underwriters or any of their respective affiliates that obligates them to undertake efforts on our behalf or that govern the manner in which they will allocate investment opportunities. Even if the underwriters or one of their respective affiliates refer an opportunity to us, no assurance can be given that such opportunity will result in an acquisition agreement or our initial business combination.

We intend to offer each public stockholder the option to vote in favor of the proposed Business Combination and still seek redemption of such stockholders’ shares.

In connection with any meeting held to approve an initial business combination, we will offer each public stockholder (but not our Initial Stockholders or the underwriters) the right to have his, her or its shares of common stock redeemed for cash (subject to certain limitations) regardless of whether such stockholder votes for or against such proposed business combination or votes at all. We will consummate our initial business combination only if we have net tangible assets of at least $5,000,001 upon such consummation and a majority of the outstanding shares of common stock voted are voted in favor of the business combination. This is different than other similarly structured blank check companies where stockholders are offered the right to redeem their shares only when they vote against a proposed business combination. This threshold and the ability to seek redemption while voting in favor of a proposed business combination may make it more likely that we will consummate our initial business combination.

Because of our structure, other companies may have a competitive advantage, and we may not be able to consummate an attractive business combination.

We expect to encounter intense competition from entities other than blank check companies having a business objective similar to ours, including private equity groups, venture capital funds, leveraged buyout funds and operating businesses competing for acquisitions. Many of these entities are well established and have extensive experience in identifying and effecting business combinations directly or through affiliates. Many of these competitors possess greater technical, human and other resources than we do and our financial resources will be relatively limited when contrasted with those of many of these competitors. Therefore, our ability to compete in acquiring certain sizable target businesses may be limited by our available financial resources. This inherent competitive limitation gives others an advantage in pursuing the acquisition of certain target businesses. Furthermore, seeking stockholder approval of our initial business combination may delay the consummation of a transaction. Any of the foregoing may place us at a competitive disadvantage in successfully negotiating our initial business combination.

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In addition, we do not intend to hold an annual meeting of stockholders to elect new directors prior to the completion of our business combination. Unless we hold an annual meeting, all of the current directors will continue in office until at least the completion of the business combination. If there is an annual meeting, the entire Board of Directors will be considered for election, however our Initial Stockholders, because of their ownership position, will have considerable influence regarding the outcome. Accordingly, our Initial Stockholders will continue to exert control at least until the completion of our business combination.

We may face risks related to companies in the technology industries.

Business combinations with companies in the technology industries entail special considerations and risks. If we are successful in completing a business combination with such a target business, we may be subject to, and possibly adversely affected by, the following risks:

Unanticipated changes in effective tax rates or adverse outcomes resulting from examination of our income or other tax returns could adversely affect our financial condition and results of operations.

We will be subject to income taxes in the United States and other jurisdictions, and our tax liabilities will be subject to the allocation of expenses in different jurisdictions. Our future effective tax rates could be subject to volatility or adversely affected by a number of factors, including:

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In addition, we may be subject to audits of our income, sales and other transaction taxes by taxing authorities. Outcomes from these audits could have an adverse effect on our financial condition and results of operations.

GigCapital5’s independent registered public accounting firm’s report contains an explanatory paragraph that expresses substantial doubt about its ability to continue as a “going concern.”

As of December 31, 2022, GigCapital5 had a working capital deficit of $3,935,695. Further, GigCapital5 has incurred and expects to continue to incur significant costs in pursuit of its financing and acquisition plans, including the proposed Business Combination Agreement. GigCapital5 cannot assure you that its plans to raise capital or to consummate an initial business combination, including pursuant to the Business Combination Agreement, will be successful. These factors, among others, raise substantial doubt about its ability to continue as a going concern. The financial statements contained elsewhere in the proxy statement/prospectus filed with the SEC do not include any adjustments that might result from its inability to consummate the proposed Business Combination or its inability to continue as a going concern.

GigCapital5’s and QT Imaging’s ability to consummate the proposed Business Combination may be materially adversely affected by the coronavirus (COVID-19) pandemic.

The COVID-19 pandemic has resulted, and other infectious diseases could result, in a widespread health crisis that has and could continue to adversely affect the economies and financial markets worldwide, which may delay or prevent the consummation of the proposed Business Combination. The extent of such impact will depend on future developments, which are highly uncertain and cannot be predicted. The parties will be required to consummate the Business Combination even if QT Imaging, its business, financial condition, and results of operations are materially affected by COVID-19. The disruptions posed by COVID-19 have continued, and other matters of global concern may continue, for an extensive period of time, and if QT Imaging is unable to recover from business disruptions due to COVID-19 or other matters of global concern on a timely basis, QT Imaging’s ability to consummate the Business Combination may be materially adversely affected.

Effective internal controls are necessary for us to provide reliable financial reports and prevent fraud.

If we identify any material weaknesses in the future, any such identified material weakness could limit our ability to prevent or detect a misstatement of our accounts or disclosures that could result in a material misstatement of our annual or interim financial statements. In such case, we may be unable to maintain compliance with securities law requirements regarding timely filing of periodic reports in addition to applicable stock exchange listing requirements, investors may lose confidence in our financial reporting and our stock price may decline as a result. We cannot assure you that the measures we have taken to date, or any measures we may take in the future, will be sufficient to avoid potential future material weaknesses. GigCapital5’s warrants are accounted for as derivative liabilities and will be recorded at fair value with changes in fair value each period reported in earnings, which may have an adverse effect on the market price of shares of GigCapital5 Common Stock or may make it more difficult for us to consummate an initial business combination.

In connection with the GigCapital5’s Offering, GigCapital5 issued an aggregate of 23,795,000 GigCapital5 warrants, including Private Placement Warrants (as defined below) issued to the Sponsor as a part of the units in the private placement. We account for such GigCapital5 Private Placement Warrants as derivative liabilities and will record at fair value any changes in fair value each period reported in earnings as determined by us based upon a valuation report obtained from an independent third-party valuation firm. The impact of changes in fair value on earnings may have an adverse effect on the market price of shares of GigCapital5 Common Stock. In addition, potential targets may seek a SPAC that does not have warrants or that does not have warrants that are accounted for as derivative liabilities, which may make it more difficult for us to consummate an initial business combination with a target business.

If, before distributing the proceeds in the Trust Account (as defined below) to our public stockholders, we file a bankruptcy petition or an involuntary bankruptcy petition is filed against us that is not dismissed, the claims

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of creditors in such proceeding may have priority over the claims of our stockholders and the per share amount that would otherwise be received by our stockholders in connection with our liquidation may be reduced.

If, before distributing the proceeds in the Trust Account to our public stockholders, we file a bankruptcy petition or an involuntary bankruptcy petition is filed against us that is not dismissed, the proceeds held in the Trust Account could be subject to applicable bankruptcy law, and may be included in our bankruptcy estate and subject to the claims of third parties with priority over the claims of our stockholders. To the extent any bankruptcy claims deplete the Trust Account, the per share amount that would otherwise be received by our stockholders in connection with our liquidation may be reduced.

If, after we distribute the proceeds in the Trust Account to our public stockholders, we file a bankruptcy petition or an involuntary bankruptcy petition is filed against us that is not dismissed, a bankruptcy court may seek to recover such proceeds, and we and our board may be exposed to claims of punitive damages.

If, after we distribute the proceeds in the Trust Account to our public stockholders, we file a bankruptcy petition or an involuntary bankruptcy petition is filed against us that is not dismissed, any distributions received by stockholders could be viewed under applicable debtor/creditor and/or bankruptcy laws as either a “preferential transfer” or a “fraudulent conveyance.” As a result, a bankruptcy court could seek to recover all amounts received by our stockholders. In addition, the GigCapital5’s Board of Directors may be viewed as having breached its fiduciary duty to our creditors and/or having acted in bad faith, thereby exposing itself and us to claims of punitive damages, by paying public stockholders from the Trust Account prior to addressing the claims of creditors.

GigCapital5’s stockholders may be held liable for claims by third parties against GigCapital5 to the extent of distributions received by them.

The existing charter of GigCapital5 provides that GigCapital5 will continue in existence only until September 28, 2023 (unless such date is subsequently extended by the stockholders of GigCapital5). If GigCapital5 has not completed a business combination by such date, it will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter, redeem 100% of the outstanding public shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including any interest earned on the funds held in the Trust Account net of interest that may be used by GigCapital5 to pay its franchise and income taxes payable and up to $100,000 for dissolution expenses, divided by the number of then outstanding public shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of GigCapital5’s remaining stockholders and the GigCapital5’s Board of Directors, dissolve and liquidate, subject (in the case of (ii) and (iii) above) to GigCapital5’s obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law.

If GigCapital5 is forced to file a bankruptcy case or an involuntary bankruptcy case is filed against GigCapital5 which is not dismissed, any distributions received by stockholders could be viewed under applicable debtor/creditor and/or bankruptcy laws as either a “preferential transfer” or a “fraudulent conveyance.” As a result, a bankruptcy court could seek to recover all amounts received by the GigCapital5’s stockholders. Furthermore, because GigCapital5 intends to distribute the proceeds held in the public shares to GigCapital5’s public stockholders promptly after expiration of the time GigCapital5 has to complete an initial business combination, this may be viewed or interpreted as giving preference to GigCapital5’s public stockholders over any potential creditors with respect to access to or distributions from GigCapital5’s assets. Furthermore, the GigCapital5’s Board of Directors may be viewed as having breached their fiduciary duties to GigCapital5’s creditors and/or may have acted in bad faith, and thereby exposing itself and GigCapital5 to claims of punitive damages, by paying public stockholders from the Trust Account prior to addressing the claims of creditors. GigCapital5 cannot assure you that claims will not be brought against it for these reasons.

If you or a “group” of stockholders of which you are a part are deemed to hold an aggregate of more than 15% of the shares of our common stock that were included in the units sold in the Offering (the “Public Shares”), you (or, if a member of such a group, all of the members of such group in the aggregate) will lose the ability to redeem all such shares in excess of 15% of the Public Shares.

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A public stockholder, together with any of his, her or its affiliates or any other person with whom it is acting in concert or as a “group” (as defined in Section 13(d)(3) of the Exchange Act), will be restricted from redeeming in the aggregate his, her or its Public Shares or, if part of such a group, the group’s Public Shares, in excess of 15% of the Public Shares without the consent of GigCapital5. Your inability to redeem any such excess Public Shares could result in you suffering a material loss on your investment in GigCapital5 if you sell such excess Public Shares in open market transactions. GigCapital5 cannot assure you that the value of such excess Public Shares will appreciate over time following the proposed Business Combination or that the market price of the Public Shares will exceed the per-share redemption price. However, GigCapital5’s stockholders’ ability to vote all of their Public Shares (including such excess shares) for or against the Business Combination Proposal is not restricted by this limitation on redemption.

There is uncertainty regarding the U.S. federal income tax consequences of the redemption to the holders of GigCapital5 Common Stock.

There is some uncertainty regarding the U.S. federal income tax consequences to holders of GigCapital5 Common Stock that exercise their redemption rights. The uncertainty of tax consequences relates primarily to the individual circumstances of the taxpayer and include (i) whether the redemption will be treated as a corporate distribution potentially taxable as a dividend, or a sale, that would potentially give rise to capital gain or capital loss, and (ii) whether such capital gain is “long-term” or “short-term.” Whether the redemption qualifies for sale treatment, resulting in taxation as capital gain rather than treatment as a corporate distribution, will depend largely on whether the holder owns (or is deemed to own) any shares of Combined Company’s common stock following the redemption, and if so, the total number of shares of Combined Company’s common stock treated as held by the holder both before and after the redemption relative to all shares of GigCapital5 voting stock or Combined Company voting stock, as applicable, outstanding both before and after the redemption. The redemption generally will be treated as a sale, rather than a distribution, if the redemption (i) is “substantially disproportionate” with respect to the holder, (ii) results in a “complete termination” of the holder’s interest in GigCapital5 or (iii) is “not essentially equivalent to a dividend” with respect to the holder. Due to the personal and subjective nature of certain of such tests and the absence of clear guidance from the IRS, there is uncertainty as to how a holder who elects to exercise its redemption rights will be taxed in connection with the exercise of redemption rights.

Unlike some other blank check companies, GigCapital5 is not subject to a specified maximum redemption threshold. The absence of such a redemption threshold will make it easier for us to consummate the proposed Business Combination even if a substantial number of our stockholders redeem.

Unlike some other blank check companies, GigCapital5 is not subject to a specified maximum redemption threshold, except that we will not redeem Public Shares in an amount that would cause our net tangible assets to be less than $5,000,001 after giving effect to the redemptions of any shares of GigCapital5 Common Stock by the public stockholders, if any, and the PIPE Investment, including at the time either immediately prior to or upon the closing. Some other blank check companies’ structures disallow the consummation of a business combination if the holders of such companies’ Public Shares elect to redeem or convert more than a specified percentage of the shares sold in such companies’ initial public offering. Because we have no such maximum redemption threshold, we may be able to consummate the proposed Business Combination even though a substantial number of our public stockholders have redeemed their shares.

Recent increases in inflation in the United States and elsewhere could make it more difficult for us to consummate a business combination.

Recent increases in inflation in the United States and elsewhere may be leading to increased price volatility for publicly traded securities, including ours, and may lead to other national, regional and international economic disruptions, any of which could make it more difficult for us to consummate a business combination.

Military conflict in Ukraine could make it more difficult for us to consummate a business combination.

Military conflict in Ukraine may lead to increased volume and price volatility for publicly traded securities, including ours, and to other national, regional and international economic disruptions and economic uncertainty, any of which could make it more difficult for us to identify a Business Combination partner and consummate a business combination on acceptable commercial terms or at all.

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The business of QT Imaging, or such other company with which we ultimately consummate a business combination, may be materially adversely affected by current or anticipated military conflict, including between Russia and Ukraine, terrorism, sanctions or other geopolitical events globally, the COVID-19 pandemic, including new variant strains of the underlying virus, and the status of debt and equity markets.

Our ability to consummate the proposed Business Combination, or any other initial business combination, may be dependent on our ability to raise equity and debt financing which may be impacted by current or anticipated military conflict, including between Russia and Ukraine, terrorism, sanctions, the COVID-19 pandemic and other events, including as a result of increased market volatility, decreased market liquidity and third-party financing being unavailable on terms acceptable to us or at all. Economic uncertainty in various global markets caused by political instability may result in weakened demand for products sold by potential target businesses and difficulty in forecasting financial results on which we rely in the evaluation of potential target businesses. Global conflicts, including the military conflict between Russia and Ukraine, as well as economic sanctions implemented by the United States and European Union against Russia in response thereto, may negatively impact markets, increase energy and transportation costs and cause weaker macro-economic conditions. Political developments impacting government spending, and international trade, including inflation or raising interest rates, may also negatively impact markets and cause weaker macro-economic conditions. The effect of any or all of these events could adversely impact our ability to consummate a suitable business combination, as it may affect demand for potential target companies’ products or the cost of manufacturing thereof, harm their operations and weaken their financial results.

Risks Relating to our Search for, and Consummation of or Inability to Consummate a Business Combination

Our public stockholders may not be afforded an opportunity to vote on our proposed business combination, which means we may consummate our initial business combination even though a majority of our public stockholders do not support such a combination.

We may not hold a stockholder vote to approve our initial business combination unless the business combination would require stockholder approval under applicable law or stock exchange rules or if we decide to hold a stockholder vote for business or other reasons. For instance, the rules of NYSE currently allow us to engage in a tender offer in lieu of a stockholder meeting, but would still require us to obtain stockholder approval if we were seeking to issue more than 20% of our issued and outstanding shares to a target business as consideration in any business combination. Therefore, if we were structuring a business combination that required us to issue more than 20% of our issued and outstanding shares, we would seek stockholder approval of such business combination. However, except as required by applicable law or stock exchange rules, the decision as to whether we will seek stockholder approval of a proposed business combination or will allow stockholders to sell their shares to us in a tender offer will be made by us, solely in our discretion, and will be based on a variety of factors, such as the timing of the transaction and whether the terms of the transaction would otherwise require us to seek stockholder approval. Approval of an initial business combination for which we seek stockholder approval will require the affirmative vote (in person or by proxy) of the holders of a majority of the shares of our common stock entitled to vote thereon and actually cast at the stockholders’ meeting, voting as a single class. The Sponsor is entitled to vote an aggregate of 6,530,000 shares of our common stock, which constitutes a majority of our common stock, and the Sponsor has signed contracts to vote in favor of an initial business combination. Accordingly, we may consummate our initial business combination even if holders of a majority of the issued and outstanding Public Shares do not approve of the business combination we consummate.

The public stockholders will experience immediate dilution as a consequence of the issuance of the Combined Company’s common stock as consideration in the proposed Business Combination, and will experience additional dilution following the closing as a result of the issuance of Combined Company’s common stock (i) under the Equity Incentive Plan, (ii) pursuant to the exercise of the Assumed Warrants or (iii) pursuant to the future exercise of warrants or Private Placement Warrants. Having a minority share position may reduce the influence that our current stockholders have on the management of the Combined Company.

It is anticipated that, following the proposed Business Combination, (i) public stockholders will own approximately 11.1% of the outstanding Combined Company common stock, (ii) the QT Imaging stockholders will collectively own approximately 55.1% of the outstanding Combined Company common stock (without taking into account any Public Shares held by the QT Imaging stockholders prior to the consummation of the proposed Business Combination or purchased in a PIPE Investment), (iii) PIPE Investors may collectively own up to approximately 9.6% of the outstanding Combined Company common stock, and (iv) the Sponsor will own approximately 24.2% of the

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outstanding Combined Company common stock. These percentages assume (1) that no additional public stockholders exercise their redemption rights, following those who did so in the September 2022 partial redemption and March 2023 partial redemption, in connection with the proposed Business Combination, (2) 2,600,000 shares are issued to PIPE Investors pursuant to a PIPE Investment, (3) no warrants are exercised upon the closing of the Business Combination and (4) neither GigCapital5 nor QT Imaging issue any additional equity securities prior to the proposed Business Combination. If the actual facts are different from these assumptions, the percentage ownership retained by GigCapital5’s existing stockholders in the Combined Company will be different.

Your post-closing Combined Company common stock ownership may also be substantially diluted by the exercise of warrants by other public stockholders, as well as the exercise of the Private Placement Warrants or the Assumed Warrants.

The issuance of additional Combined Company’ common stock will significantly dilute the equity interests of existing holders of Combined Company securities and may adversely affect prevailing market prices for the Combined Company’s common stock or warrants. Such dilution may also reduce the influence that you may have on the management of the Combined Company through the matters that are presented for voting to the Combined Company’s stockholders.

We cannot be certain as to the number of Public Shares that will be redeemed and as to the potential impact to GigCapital5 public stockholders who do elect to redeem their Public Shares. There is no guarantee that a public stockholder’s decision whether to redeem its Public Shares for a pro rata portion of the Trust Account will put the public stockholder in a better future economic position.

There is no assurance as to the price at which a GigCapital5 public stockholder may be able to sell its Public Shares in the future following the completion of the proposed Business Combination or any alternative business combination. Certain events following the consummation of any initial business combination, including the proposed Business Combination and including redemptions of Public Shares, may cause an increase or decrease in the share price and may result in a lower value realized now than a public stockholder might realize in the future had the public stockholder not redeemed its shares. Similarly, if a public stockholder does not redeem its shares, the public stockholder will bear the risk of ownership of the Public Shares after the consummation of any initial business combination, and there can be no assurance that a public stockholder can sell its shares in the future for a greater amount than the redemption price set forth in this proxy statement/ prospectus. A public stockholder should consult the public stockholder’s tax and/or financial advisor for assistance on how this may affect his, her or its individual situation. On March 30, 2023, the most recent practicable date prior to the date of this Annual Report, the closing price per Public Share on the NYSE was $10.52. Public stockholders should be aware that, while we are unable to predict the price per share of Combined Company’s common stock following the consummation of the Business Combination - and accordingly we are unable to predict the potential impact of redemptions on the per share value of Public Shares owned by non- redeeming public stockholders – increased levels of redemptions by public stockholders may be a result of the price per share of GigCapital5 Common Stock falling below the redemption price. We expect that more public stockholders may elect to redeem their Public Shares if the share price of the GigCapital5 Common Stock is below the projected redemption price at the time of the consummation of the proposed Business Combination, and we expect that more public stockholders may elect not to redeem their Public Shares if the share price of the GigCapital5 Common Stock is above that projected redemption price. Each Public Share that is redeemed will represent both (i) a reduction, equal to the amount of the redemption price, of the cash that will be available to the Combined Company from the Trust Account and (ii) a corresponding increase in each public stockholder’s pro rata ownership interest in the Combined Company following the consummation of the Business Combination.

If we seek stockholder approval of our initial business combination, our Initial Stockholders have agreed to vote in favor of such initial business combination, regardless of how our public stockholders vote.

Unlike many other blank check companies in which the Founder, executive officers and directors agree to vote their Founder Shares and Insider Shares in accordance with the majority of the votes cast by the public stockholders in connection with an initial business combination, our Initial Stockholders (and their permitted transferees will agree), pursuant to the terms of the letter agreements entered into with us, to vote any common stock held by them in favor of our initial business combination. Furthermore, pursuant to the Sponsor Support Agreement the Sponsor has agreed to vote its Sponsor in favor of each of the proposals presented at the stockholders’ meeting, regardless of how public stockholders vote. After the common stock redemption on March 28, 2023, the Sponsor was entitled to vote an

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aggregate of 6,530,000 shares of GigCapital5 common stock (or 68.3% of the issued and outstanding shares), and collectively, our Initial Stockholders, and their permitted transferees, have beneficially owned approximately 68.4% of the issued and outstanding shares of our common stock at the time of any such stockholder vote. Accordingly, if we seek stockholder approval of our initial business combination, we will receive the necessary approval as approval only requires that we obtain the affirmative vote (in person or by proxy) of the holders of a majority of the shares of our common stock entitled to vote on the matter and actually cast at the stockholders’ meeting, voting as a single class.

The proposed Business Combination may be completed even if every public stockholder votes against the Business Combination.

Pursuant to the Sponsor Support Agreement, the Sponsor has agreed to vote all of its shares of GigCapital5 common stock held by it in favor of the proposed Business Combination proposal and indicated it intends to vote its shares of GigCapital5 common stock in favor of all other proposals being presented by us at the stockholders’ meeting to approve the proposed Business Combination. As of the date of this Annual Report, the Sponsor was entitled to vote an aggregate of 6,530,000 shares of GigCapital5 common stock. Such shares currently constitute approximately 68.3% of the outstanding shares of GigCapital5 common stock. Accordingly, each of the proposals being submitted to GigCapital5 stockholders can be approved even if every holder of Public Shares votes against such proposals.

Your only opportunity to affect the investment decision regarding a potential business combination may be limited to the exercise of your right to redeem your shares from us for cash.

At the time of your investment in us, you will not be provided with an opportunity to evaluate the specific merits or risks of one or more target businesses. Because our Board of Directors may consummate our initial business combination without seeking stockholder approval, public stockholders may not have the right or opportunity to vote on the business combination. Accordingly, your only opportunity to affect the investment decision regarding a potential business combination may be limited to exercising your redemption rights within the period of time (which will be at least 20 business days) set forth in our tender offer documents mailed to our public stockholders in which we describe our initial business combination.

The ability of our public stockholders to redeem their shares for cash may make our financial condition unattractive to potential business combination targets, which may make it difficult for us to enter into our initial business combination with a target.

We may enter into a transaction agreement with a prospective target that requires as a closing condition that we have a minimum net worth or a certain amount of cash. If too many public stockholders exercise their redemption rights, we may not be able to meet such closing condition, and as a result, would not be able to proceed with such business combination. Furthermore, in no event will we redeem our Public Shares in an amount that would cause our net tangible assets to be less than $5,000,001 upon the consummation of our initial business combination or any greater net tangible asset or cash requirement which may be contained in the agreement relating to our initial business combination. Our Amended and Restated Certificate of Incorporation requires us to provide all of our public stockholders with an opportunity to redeem all of their shares in connection with the consummation of any initial business combination. Consequently, if accepting all properly submitted redemption requests would cause our net tangible assets to be less than $5,000,001 upon the consummation of our initial business combination, or such greater amount necessary to satisfy a closing condition as described above, we would not proceed with such redemption and the related business combination and may instead search for an alternate business combination. Prospective targets would be aware of these risks and, thus, may be reluctant to enter into our initial business combination transaction with us.

The ability of our public stockholders to exercise redemption rights with respect to a large number of our shares may not allow us to consummate the most desirable business combination or optimize our capital structure.

In connection with the successful consummation of our initial business combination, we may redeem up to that number of shares of common stock that would permit us to maintain net tangible assets of $5,000,001 upon the consummation of our initial business combination. If our initial business combination requires us to use substantially all of our cash to pay the purchase price, the redemption threshold may be further limited. Alternatively, we may need to arrange third-party financing to help fund our business combination in case a larger percentage of stockholders exercise their redemption rights than we expect. If the acquisition involves the issuance of our shares as consideration, we may be required to issue a higher percentage of our shares to the target or its stockholders to make up for the failure

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to satisfy a minimum cash requirement. Raising additional funds to cover any shortfall may involve dilutive equity financing or incurring indebtedness at higher than desirable levels. This may limit our ability to effectuate the most attractive business combination available to us. The amount of the deferred underwriting commissions payable to the underwriters will not be adjusted for any shares that are redeemed in connection with an initial business combination. The per share amount we will distribute to stockholders who properly exercise their redemption rights will not be reduced by the deferred underwriting commission and after such redemptions, the per-share value of shares held by non-redeeming stockholders will reflect our obligation to pay the deferred underwriting commissions.

The requirement that we maintain a minimum net worth or retain a certain amount of cash could increase the probability that our business combination would be unsuccessful and that you would have to wait for liquidation in order to redeem your shares.

If, pursuant to the terms of our proposed business combination, we are required to maintain a minimum net worth or retain a certain amount of cash in trust in order to consummate the business combination and regardless of whether we proceed with redemptions under the tender or proxy rules, the probability that our business combination would be unsuccessful is increased. If our business combination is unsuccessful, you would not receive your pro rata portion of the trust account until we liquidate. If you are in need of immediate liquidity, you could attempt to sell your shares in the open market; however, at such time our shares may trade at a discount to the pro rata amount per share in our trust account. In either situation, you may suffer a material loss on your investment or lose the benefit of funds expected in connection with our redemption until we liquidate or you are able to sell your shares in the open market.

If we do not proceed with the Business Combination with QT Imaging, the requirement that we complete our initial business combination within 24 months from the closing of the Offering may give potential target businesses leverage over us in negotiating our initial business combination and may limit the amount of time we have to conduct due diligence on potential business combination targets as we approach our dissolution deadline, which could undermine our ability to consummate our initial business combination on terms that would produce value for our stockholders.

Any new potential target business with which we enter into negotiations concerning our initial business combination will be aware that we must consummate our initial business combination within 24 months from the closing of the Offering; provided that at the beginning of each one-month extension, our Sponsor (or its designees) must deposit into the trust account $100,000 for each one-month extension of the time period to complete our initial business combination, in each case, in exchange for a non-interest bearing, unsecured promissory note). Consequently, such target businesses may obtain leverage over us in negotiating our initial business combination, knowing that if we do not complete our initial business combination with that particular target business, we may be unable to complete our initial business combination with any target business. This risk will increase as we get closer to the timeframe described above. In addition, we may have limited time to conduct due diligence and may enter into our initial business combination on terms that we would have rejected upon a more comprehensive investigation.

We may not be able to consummate our initial business combination within the required time period, in which case we would cease all operations except for the purpose of winding up and we would redeem our Public Shares and liquidate.

Our Founder, executive officers and directors have agreed that we must complete our initial business combination within 24 months from the closing of the Offering. We may not be able to consummate our proposed Business Combination, or if it does not close, to find a suitable target business as a replacement, within such time period. Our ability to complete our initial business combination may be negatively impacted by general market conditions, volatility in the capital and debt markets and the other risks described herein. Additionally, the outbreak of the COVID‑19 coronavirus pandemic may negatively impact businesses we may seek to acquire. Similarly, the outbreak of this pandemic, the measures being taken to counter it, and volatility in valuations in the financial markets that are resulting from the imposition of such measures and the pending health crisis, may make it harder for us to find a suitable target business and consummate our initial business combination.

If we are unable to consummate our initial business combination within the required time period, we will, as promptly as reasonably possible but not more than 10 business days thereafter, distribute the aggregate amount then on deposit in the trust account (net of taxes payable and less up to $100,000 of interest to pay dissolution expenses), pro rata to our public stockholders by way of redemption and cease all operations except for the purposes of winding

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up of our affairs, as further described herein. This redemption of public stockholders from the trust account shall be effected as required by function of our Amended and Restated Certificate of Incorporation and prior to any voluntary winding up.

As the number of special purpose acquisition companies evaluating targets increases, attractive targets may become scarcer and there may be more competition for attractive targets. This could increase the cost of our initial business combination and could even result in our inability to find a target or to consummate an initial business combination.

In recent years, the number of special purpose acquisition companies that have been formed has increased substantially. Many potential targets for special purpose acquisition companies have already entered into an initial business combination, and there are still many companies preparing for an initial public offering. As a result, at times, fewer attractive targets may be available to consummate an initial business combination.

In addition, because there are more special purpose acquisition companies seeking to enter into an initial business combination with available targets, the competition for available targets with attractive fundamentals or business models may increase, which could cause target companies to demand improved financial terms. Many of the existing special purpose acquisition companies looking for targets have to complete a business combination in about the same time frame that we have to do so, and that could provide leverage to targets in extracting terms for a transaction that we are not prepared to offer but other special purpose acquisition companies are willing to provide. Attractive deals could also become scarcer for other reasons, such as economic or industry sector downturns, geopolitical tensions including as a result of the military conflict between Russia and Ukraine, or increases in the cost of additional capital needed to close business combinations or operate targets post-business combination. This could increase the cost of, delay or otherwise complicate or frustrate our ability to find and consummate an initial business combination, and may result in our inability to consummate an initial business combination on terms favorable to our investors altogether.

If we seek stockholder approval of our initial business combination pursuant to a proxy solicitation, our Founder, directors, executive officers, advisors and their affiliates may elect to purchase shares or Units from public stockholders, in which case they may influence a vote in favor of a proposed business combination that you do not support.

If we seek stockholder approval of our initial business combination pursuant to a proxy solicitation (meaning we would not conduct redemptions pursuant to the tender offer rules), our Founder, directors, executive officers, advisors or any of their affiliates are permitted to purchase shares of our common stock and/or Units in privately negotiated transactions or in the open market either prior to or following the consummation of our initial business combination. Any such purchase would likely include a contractual acknowledgement that the selling stockholder, although he may still be the record holder of the shares being sold, would, upon consummation of such sale, no longer be the beneficial owner of such shares and would agree not to exercise the redemption rights applicable to such shares. In the event that our Founder, directors, executive officers, advisors or any of their affiliates purchase shares of common stock in privately negotiated transactions from public stockholders who have already elected to exercise their redemption rights, any such selling stockholders would be required to revoke their prior elections to redeem their shares of common stock prior to the consummation of the transaction.

The purpose of such purchases could be to (1) increase the likelihood of obtaining stockholder approval of an initial business combination or (2) satisfy a closing condition in an agreement with a target that requires us to have a minimum net worth or a certain amount of cash at the closing of the business combination, where it appears that such requirement would otherwise not be met. This may result in the consummation of an initial business combination that may not otherwise have been possible. While there are no current plans for any such purchases as of the date of this Annual Report, if there were to be any, the agreements providing for such purchases might include, without limitation, arrangements to protect investors or holders who are party to such agreements against potential loss in value of their shares, including the granting of put options and the transfer to such investors or rights owned by the Sponsor or GigCapital5’s directors or officers for nominal value. However, other than as expressly stated herein, the Sponsor and GigCapital5’s directors and officers have no current commitments, plans or intentions to engage in such transactions and have not formulated any terms or conditions for any such transactions. None of the funds in the Trust Account will be used to purchase shares or warrants in such transactions.

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Entering into any such arrangements may have a depressive effect on Public Shares. For example, as a result of these arrangements, an investor or holder may have the ability to effectively purchase shares at a price lower than market and may therefore be more likely to sell the shares it owns, either prior to or immediately after the stockholders’ meeting for the approval of the proposed Business Combination.

If such transactions are affected, the consequence could be to cause the proposed Business Combination to be approved in circumstances where such approval could not otherwise be obtained. Purchases of Public Shares by the persons described above would allow them to exert more influence over the approval of the proposals to be presented at the stockholders’ meeting for the approval of the proposed Business Combination and would likely increase the chances that such proposals would be approved. In addition, if such purchases are made, the public “float” of our common stock or warrants may be reduced and the number of beneficial holders of our securities may be reduced, possibly making it difficult to maintain or obtain the quotation, listing or trading of our securities on a national securities exchange.

Activities taken by the Company’s affiliates to purchase, directly or indirectly, Public Shares will increase the likelihood of approval of the proposed Business Combination and the other proposals presented to our stockholders in connection with the proposed Business Combination and may affect the market price of the Company’s securities.

Although there are no current plans as of the date of this Annual Report to do so, the Company’s Sponsor, directors, officers, advisors or their affiliates may purchase shares in privately negotiated transactions either prior to or following the consummation of the proposed Business Combination. None of the Company’s Sponsor, directors, officers, advisors or their affiliates will make any such purchases when such parties are in possession of any material non-public information not disclosed to the seller or during a restricted period under Regulation M under the Exchange Act. Although none of the Company’s Sponsor, directors, officers, advisors or their affiliates currently anticipate paying any premium purchase price for such Public Shares, in the event such parties do, the payment of a premium may not be in the best interest of those stockholders not receiving any such additional consideration. There is no limit on the number of shares that could be acquired by the Company’s Sponsor, directors, officers, advisors or their affiliates, or the price such parties may pay.

If such transactions are effected, the consequence could be to cause the proposed Business Combination to be approved in circumstances where such approval could not otherwise be obtained. Purchases of shares by the persons described above would allow them to exert more influence over the approval of the proposed Business Combination and other proposals presented to our stockholders in connection with the proposed Business Combination, and would likely increase the chances that such proposals would be approved. If the market does not view the proposed Business Combination positively, purchases of Public Shares may have the effect of counteracting the market’s view, which would otherwise be reflected in a decline in the market price of the Company’s securities. In addition, the termination of the support provided by these purchases may materially adversely affect the market price of the Company’s securities.

As of the date of this Annual Report, no agreements with respect to the private purchase of Public Shares by the Company or the persons described above have been entered into with any such investor or holder.

If a stockholder fails to receive notice of our offer to redeem our Public Shares in connection with our initial business combination, or fails to comply with the procedures for tendering its shares, such shares may not be redeemed.

We will comply with the tender offer rules or proxy rules, as applicable, when conducting redemptions in connection with our initial business combination. Despite our compliance with these rules, if a stockholder fails to receive our tender offer or proxy materials, as applicable, such stockholder may not become aware of the opportunity to redeem its shares. In addition, the tender offer documents or proxy materials, as applicable, that we will furnish to holders of our Public Shares in connection with our initial business combination will describe the various procedures that must be complied with in order to validly tender or redeem Public Shares. For example, we may require our public stockholders seeking to exercise their redemption rights, whether they are record holders or hold their shares in “street name,” to either tender their certificates to our transfer agent prior to the date set forth in the tender offer or proxy materials documents mailed to such holders, or up to two business days prior to the vote on the proposal to approve the initial business combination in the event we distribute proxy materials, or to deliver their shares to the transfer

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agent electronically. In the event that a stockholder fails to comply with these procedures, its shares may not be redeemed.

You will not be entitled to protections normally afforded to investors of many other blank check companies.

Since the net proceeds of the Offering are intended to be used to complete our initial business combination with a target business, we may be deemed to be a “blank check” company under the United States securities laws. However, since we have net tangible assets of at least $5,000,001, we are exempt from rules promulgated by the SEC to protect investors in blank check companies, such as Rule 419. Accordingly, investors will not be afforded the benefits or protections of those rules. Among other things, this means our public units will be immediately tradable and we may have a longer period of time to complete our initial business combination than do companies subject to Rule 419. Moreover, offerings subject to Rule 419 would prohibit the release of any interest earned on funds held in the trust account to us unless and until the funds in the trust account were released to us in connection with our consummation of an initial business combination.

Because of our limited resources and the significant competition for business combination opportunities, it may be more difficult for us to complete our initial business combination. If we are unable to complete our initial business combination, our public stockholders may receive only approximately $10.37 in principal plus accrued interest per share, or less in certain circumstances, on our redemption of their stock, and our warrants will expire worthless.

We expect to encounter intense competition from other entities having a business objective similar to ours, including private investors (which may be individuals or investment partnerships), other blank check companies and other entities, domestic and international, competing for the types of businesses we intend to acquire. Many of these individuals and entities are well-established and have extensive experience in identifying and effecting, directly or indirectly, acquisitions of companies operating in or providing services to various industries. Many of these competitors possess greater technical, human and other resources or more local industry knowledge than we do and our financial resources will be relatively limited when contrasted with those of many of these competitors. While we believe there will be numerous target businesses we could potentially acquire with the net proceeds of the Offering and the sale of the Private Placement Units, our ability to compete with respect to the acquisition of certain target businesses that are sizable will be limited by our available financial resources. Our Sponsor, any of its affiliates or any of their respective clients may make additional investments in us, although our Sponsor and its affiliates have no obligation or other duty to do so.

This inherent competitive limitation gives others an advantage in pursuing the acquisition of certain target businesses. Furthermore, in the event we seek stockholder approval of our initial business combination and we are obligated to pay cash for Public Shares that are redeemed, it will potentially reduce the resources available to us for our initial business combination. Any of these obligations may place us at a competitive disadvantage in successfully negotiating and completing a business combination. If we are unable to complete our initial business combination, our public stockholders may receive only approximately $10.37 in principal plus accrued interest per share, or less in certain circumstances, on the liquidation of our trust account and our warrants will expire worthless.

We will require public stockholders who wish to redeem their shares of common stock in connection with a proposed business combination to comply with specific requirements for redemption that may make it more difficult for them to exercise their redemption rights prior to the deadline for exercising their rights.

We will require our public stockholders seeking to exercise their redemption rights, whether they are record holders or hold their shares in “street name,” to either tender their certificates to our transfer agent prior to the expiration date set forth in the tender offer documents mailed to such holders, or in the event we distribute proxy materials, up to two business days prior to the vote on the proposal to approve the business combination, or to deliver their shares to the transfer agent electronically using the DTC’s DWAC System, at the holder’s option. In order to obtain a physical stock certificate, a stockholder’s broker and/or clearing broker, The DTC and our transfer agent will need to act to facilitate this request. It is our understanding that stockholders should generally allot at least two weeks to obtain physical certificates from the transfer agent. However, because we do not have any control over this process or over the brokers or DTC, it may take significantly longer than two weeks to obtain a physical stock certificate. While we have been advised that it takes a short time to deliver shares through the DWAC System, this may not be the case. Under our bylaws, we are required to provide at least 10 days advance notice of any stockholder meeting,

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which would be the minimum amount of time a stockholder would have to determine whether to exercise redemption rights. Accordingly, if it takes longer than we anticipate for stockholders to deliver their shares, stockholders who wish to redeem may be unable to meet the deadline for exercising their redemption rights and thus may be unable to redeem their shares. In the event that a stockholder fails to comply with the various procedures that must be complied with in order to validly tender or redeem Public Shares, its shares may not be redeemed.

Additionally, despite our compliance with the proxy rules or tender offer rules, as applicable, stockholders may not become aware of the opportunity to redeem their shares.

If we seek stockholder approval of our business combination pursuant to a proxy solicitation (meaning we would not conduct redemptions pursuant to the tender offer rules), and if you or a “group” of stockholders are deemed to hold in excess of 15% of the issued and outstanding shares of our common stock, you will lose the ability to redeem all such shares in excess of 15% of the issued and outstanding shares of our common stock.

If we seek stockholder approval of our initial business combination pursuant to a proxy solicitation (meaning we would not conduct redemptions pursuant to the tender offer rules), our Amended and Restated Certificate of Incorporation will provide that a public stockholder, individually or together with any affiliate of such stockholder or any other person with whom such stockholder is acting in concert or as a “group” (as defined under Section 13 of the Exchange Act), would be restricted from seeking redemption rights with respect to an aggregate of more than 15% of the shares of common stock sold in the Offering. Your inability to redeem an aggregate of more than 15% of the shares of common stock sold in the Offering will reduce your influence over our ability to consummate our initial business combination and you could suffer a material loss on your investment in us if you sell such excess shares in open market transactions. As a result, you will continue to hold that number of shares exceeding 15% and, in order to dispose of such shares, you would be required to sell your shares in open market transaction, potentially at a loss.

If the net proceeds of the Offering and the sale of the Private Placement Units that are not being held in the trust account are insufficient to allow us to operate for at least the next 24 months from the closing of the Offering, we may be unable to complete our initial business combination.

The funds available to us outside of the trust account may not be sufficient to allow us to operate for at least 24 months from the closing of the Offering (or up to 24 months in total if the Company extends the period of time to consummate a business combination in accordance with its Amended and Restated Certificate of Incorporation), assuming that our initial business combination is not consummated during that time. Of the funds available to us, we could use a portion of the funds available to us to pay fees to consultants to assist us with our search for a target business. We could also use a portion of the funds as a down payment or to fund a “no-shop” provision (a provision in letters of intent designed to keep target businesses from “shopping” around for transactions with other companies on terms more favorable to such target businesses) with respect to a particular proposed business combination, although we do not have any current intention to do so. If we are unable to fund such down payments or “no shop” provisions, our ability to close a contemplated transaction could be impaired. Furthermore, if we entered into a letter of intent where we paid for the right to receive exclusivity from a target business and were subsequently required to forfeit such funds (whether as a result of our breach or otherwise), we might not have sufficient funds to continue searching for, or conduct due diligence with respect to, a target business. If we are unable to complete our initial business combination, our public stockholders may only receive $10.37 in principal plus accrued interest per share or potentially less than $10.37 in principal plus accrued interest per share on our redemption, and our warrants will expire worthless.

We may issue notes or other debt securities, or otherwise incur substantial debt, to complete our initial business combination, which may adversely affect our financial condition and thus negatively impact the value of our stockholders’ investment in us.

As of March 28, 2023, the Company has issued an extension note for a total principal amount of $1,060,000 and the Working Capital Note in the amount of $805,000 and expect to continue to issue such notes until the completion of the business combination. Furthermore, we may issue a substantial number of additional common or preferred shares to complete our initial business combination or under an employee incentive plan upon or after consummation of our initial business combination. We and our officers and directors have agreed that we will not incur any indebtedness unless we have obtained from the lender a waiver of any right, title, interest or claim of any kind in or to any monies held in the trust account. As such, no issuance of debt will affect the per share amount

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available for redemption from the trust account. Nevertheless, the incurrence of debt could have a variety of negative effects, including:

Our directors may decide not to enforce indemnification obligations against our Sponsor, resulting in a reduction in the amount of funds in the trust account available for distribution to our public stockholders.

In the event that the proceeds in the trust account are reduced below $10.10 per share and our Sponsor asserts that it is unable to satisfy obligations or that it has no indemnification obligations related to a particular claim, our independent directors would determine on our behalf whether to take legal action against our Sponsor to enforce its indemnification obligations. While we currently expect that our independent directors would take legal action on our behalf against our Sponsor to enforce its indemnification obligations to us, it is possible that our independent directors in exercising their business judgment may choose not to do so. Furthermore, Drs. Avi S. Katz and Raluca Dinu, Ms. Dorothy D. Hayes and Mr. Raanan I. Horowitz have a financial interest in our Sponsor which creates the potential for a conflict of interest that may influence their decision as to whether to take legal action against our Sponsor to enforce its indemnification obligations. If our independent directors choose not to enforce these indemnification obligations on our behalf, the amount of funds in the trust account available for distribution to our public stockholders may be reduced below $10.10 per share.

If we are deemed to be an investment company under the Investment Company Act, we may be required to institute burdensome compliance requirements and our activities may be restricted, which may make it difficult for us to complete our initial business combination.

If we are deemed to be an investment company under the Investment Company Act, our activities may be restricted, including restrictions on the nature of our investments and restrictions on the issuance of securities, each of which may make it difficult for us to complete our initial business combination. In addition, we may have imposed upon us burdensome requirements, including registration as an investment company, adoption of a specific form of corporate structure and reporting, record keeping, voting, proxy and disclosure requirements and other rules and regulations.

If we were deemed to be subject to the Investment Company Act, compliance with these additional regulatory burdens would require additional expenses for which we have not allotted funds and may hinder our ability to consummate our initial business combination.

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To mitigate the risk that we might be deemed to be an investment company for purposes of the Investment Company Act, we may, at any time, instruct the trustee to liquidate the securities held in the Trust Account and instead to hold the funds in the Trust Account in cash until the earlier of the consummation of our initial Business Combination or our liquidation. As a result, following the liquidation of securities in the Trust Account, we would likely receive minimal interest, if any, on the funds held in the Trust Account, which would reduce the dollar amount our public stockholders would receive upon any redemption or liquidation of the Company.

The funds in the Trust Account have, since our Offering, been held only in U.S. government treasury obligations with a maturity of 185 days or less or in money market funds investing solely in U.S. government treasury obligations and meeting certain conditions under Rule 2a-7 under the Investment Company Act. However, to mitigate the risk of us being deemed to be an unregistered investment company (including under the subjective test of Section 3(a)(1)(A) of the Investment Company Act) and thus subject to regulation under the Investment Company Act, we may, at any time, and we expect that we will (if a period to complete a Business Combination is ever extended to 24 months or longer from the closing of the Initial Public Offering subject to the required stockholders’ approval), on or prior to the 24-month anniversary of the effective date of the Registration Statement, instruct Continental Stock Transfer & Trust Company, the trustee with respect to the Trust Account, to liquidate the U.S. government treasury obligations or money market funds held in the Trust Account and thereafter to hold all funds in the Trust Account in cash until the earlier of consummation of our initial Business Combination or liquidation of the Company. Following such liquidation, we would likely receive minimal interest, if any, on the funds held in the Trust Account. However, interest previously earned on the funds held in the Trust Account still may be released to us to pay our taxes, if any, and certain other expenses as permitted. As a result, any decision to liquidate the securities held in the Trust Account and thereafter to hold all funds in the Trust Account in cash would reduce the dollar amount our public stockholders would receive upon any redemption or liquidation of the Company.

In addition, even prior to the 24-month anniversary of the Offering, we may be deemed to be an investment company. The longer that the funds in the Trust Account are held in short-term U.S. government treasury obligations or in money market funds invested exclusively in such securities, even prior to the 24-month anniversary, the greater the risk that we may be considered an unregistered investment company, in which case we may be required to liquidate the Company. Accordingly, we may determine, in our discretion, to liquidate the securities held in the Trust Account at any time, even prior to the 24-month anniversary, and instead hold all funds in the Trust Account in cash, which would further reduce the dollar amount our public stockholders would receive upon any redemption or liquidation of the Company.

Our stockholders may be held liable for claims by third parties against us to the extent of distributions received by them.

Our Amended and Restated Certificate of Incorporation provides that we will continue in existence only until 24 months from the closing of the Offering. As promptly as reasonably possible following the redemptions we are required to make to our public stockholders in such event, subject to the approval of our remaining stockholders and our Board of Directors, we would dissolve and liquidate, subject to our obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law. We cannot assure you that we will properly assess all claims that may be potentially brought against us. As such, our stockholders could potentially be liable for any claims to the extent of distributions received by them (but no more) and any liability of our stockholders may extend well beyond the third anniversary of the date of distribution. Accordingly, we cannot assure you that third parties will not seek to recover from our stockholders amounts owed to them by us.

If we are forced to file a bankruptcy case or an involuntary bankruptcy case is filed against us which is not dismissed, any distributions received by stockholders could be viewed under applicable debtor/creditor and/or bankruptcy laws as either a “preferential transfer” or a “fraudulent conveyance.” As a result, a bankruptcy court could seek to recover all amounts received by our stockholders. Furthermore, because we intend to distribute the proceeds held in the trust account to our public stockholders promptly after expiration of the time we have to complete an initial business combination, this may be viewed or interpreted as giving preference to our public stockholders over any potential creditors with respect to access to or distributions from our assets. Furthermore, our Board of Directors may be viewed as having breached their fiduciary duties to our creditors and/or may have acted in bad faith, and thereby exposing itself and our company to claims of punitive damages, by paying public stockholders from the trust account

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prior to addressing the claims of creditors. We cannot assure you that claims will not be brought against us for these reasons.

We do not currently intend to hold an annual meeting of stockholders until immediately prior to our consummation of a business combination and you will not be entitled to any of the corporate protections provided by such a meeting.

We do not currently intend to hold an annual meeting of stockholders until the meeting at which we will seek approval of the proposed Business Combination (unless required by the NYSE), and thus may not be in compliance with Section 211(b) of the DGCL, which requires an annual meeting of stockholders be held for the purposes of electing directors, in accordance with a company’s bylaws, unless such election is made by written consent in lieu of such a meeting. If our stockholders want us to hold an annual meeting earlier than we intend, they may attempt to force us to hold one by submitting an application to the Delaware Court of Chancery in accordance with Section 211(c) of the DGCL.

The grant of registration rights to our Initial Stockholders and the underwriters may make it more difficult to complete our initial business combination, and the future exercise of such rights may adversely affect the market price of our common stock.

Pursuant to agreements entered into in conjunction with the Offering, our Initial Stockholders and the underwriters, and their respective permitted transferees, can demand that we register for resale an aggregate of 5,735,000 Founder Shares, 15,000 Insider Shares, 795,000 Private Placement Units and underlying securities and securities issued upon conversion of working capital loans, if any. We will bear the cost of registering these securities. The registration and availability of such a significant number of securities for trading in the public market may have an adverse effect on the market price of our common stock. In addition, the existence of the registration rights may make our initial business combination more costly or difficult to conclude. This is because the stockholders of the target business may increase the equity stake they seek in the combined entity or ask for more cash consideration to offset the negative impact on the market price of our common stock that is expected when the securities owned by our Initial Stockholders and the underwriters, or their respective permitted transferees, are registered.

Because we are not limited to any particular business or specific geographic location or any specific target businesses with which to pursue our initial business combination, you will be unable to ascertain the merits or risks of any particular target business’ operations.

Although we intend to focus on the TMT, A&D, advanced medical equipment, intelligent automation and sustainable businesses, we may pursue acquisition opportunities in any geographic region and in any business industry or sector. Except for the limitations that a target business has a fair market value of at least 80% of the value of the trust account (less the deferred underwriting commissions and any taxes payable on interest earned) and that we are not permitted to effectuate our initial business combination with another blank check company or similar company with nominal operations, we will have virtually unrestricted flexibility in identifying and selecting a prospective acquisition candidate. To the extent we consummate our initial business combination, we may be affected by numerous risks inherent in the business operations with which we combine. For example, if we combine with a financially unstable business or an entity lacking an established record of sales or earnings, we may be affected by the risks inherent in the business and operations of a financially unstable or a development stage entity. Although our officers and directors will endeavor to evaluate the risks inherent in a particular target business, we may not properly ascertain or assess all of the significant risk factors or we may not have adequate time to complete due diligence. Furthermore, some of these risks may be outside of our control and leave us with no ability to control or reduce the chances that those risks will adversely impact a target business. An investment in our public units may not ultimately prove to be more favorable to investors than a direct investment, if such opportunity were available, in an acquisition target.

The requirement that the target business or businesses that we acquire must collectively have a fair market value equal to at least 80% of the balance of the funds in the trust account (less the deferred underwriting commissions and any taxes payable on interest earned) at the time of the execution of a definitive agreement for our initial business combination may limit the type and number of companies with which we may complete such a business combination.

Pursuant to NYSE listing rules, the target business or businesses that we acquire must collectively have a fair market value equal to at least 80% of the balance of the funds in the trust account (less the deferred underwriting

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commissions and any taxes payable on interest earned) at the time of the execution of a definitive agreement for our initial business combination. This restriction may limit the type and number of companies with which we may complete an initial business combination. If we are unable to locate a target business or businesses that satisfy this fair market value test, we may be forced to liquidate and you will only be entitled to receive your pro rata portion of the funds in the trust account.

We may seek acquisition opportunities outside the TMT, A&D, advanced medical equipment, intelligent automation and sustainable industries, which may be outside of our management’s areas of expertise.

We will consider a business combination outside the TMT, A&D, advanced medical equipment, intelligent automation and sustainable industries, which may be outside of our management’s areas of expertise, if a business combination candidate is presented to us and we determine that such candidate offers an attractive acquisition opportunity for our company. In the event we elect to pursue an acquisition outside of the areas of our management’s expertise, our management’s expertise may not be directly applicable to its evaluation or operation, and the information contained in this Annual Report regarding the areas of our management’s expertise would not be relevant to an understanding of the business that we elect to acquire.

As a result, our management may not be able to adequately ascertain or assess all of the significant risk factors relevant to such acquisition. Accordingly, any stockholder who chooses to remain a stockholder following our initial business combination could suffer a reduction in the value of their securities. Such stockholders are unlikely to have a remedy for such reduction in value.

Although we identified general criteria and guidelines that we believe are important in evaluating prospective target businesses, we may enter into our initial business combination with a target that does not meet such criteria and guidelines, and as a result, the target business with which we enter into our initial business combination may not have attributes entirely consistent with our general criteria and guidelines.

Although we have identified specific criteria and guidelines for evaluating prospective target businesses, it is possible that a target business with which we enter into our initial business combination will not have all of these positive attributes. If we consummate our initial business combination with a target that does not meet some or all of these guidelines, such combination may not be as successful as a combination with a business that does meet all of our general criteria and guidelines. In addition, if we announce our initial business combination with a target that does not meet our general criteria and guidelines, a greater number of stockholders may exercise their redemption rights, which may make it difficult for us to meet any closing condition with a target business that requires us to have a minimum net worth or a certain amount of cash. In addition, if stockholder approval of the transaction is required by law or the rules of the NYSE, or we decide to obtain stockholder approval for business or other legal reasons, it may be more difficult for us to attain stockholder approval of our initial business combination if the target business does not meet our general criteria and guidelines. If we are unable to complete our initial business combination, our public stockholders may only receive $10.37 in principal plus accrued interest per share or potentially less than $10.37 in principal plus accrued interest per share on our redemption, and our warrants will expire worthless.

We may seek acquisition opportunities with an early-stage company, a financially unstable business or an entity lacking an established record of revenue or earnings.

To the extent we complete our initial business combination with an early-stage company, a financially unstable business or an entity lacking an established record of sales or earnings, we may be affected by numerous risks inherent in the operations of the business with which we combine. These risks include investing in a business without a proven business model and with limited historical financial data, volatile revenues or earnings, intense competition and difficulties in obtaining and retaining executive officers and directors. Although our officers and directors will endeavor to evaluate the risks inherent in a particular target business, we may not be able to properly ascertain or assess all of the significant risk factors and we may not have adequate time to complete due diligence. Furthermore, some of these risks may be outside of our control and leave us with no ability to control or reduce the chances that those risks will adversely impact a target business.

GigCapital5 has not obtained an opinion from an independent investment banking firm, and consequently, there is no assurance from an independent source that the merger consideration is fair to its stockholders from a financial point of view.

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GigCapital5 is not required to, and has not, obtained an opinion from an independent investment banking firm that the merger consideration it is paying for QT Imaging is fair to GigCapital5’s stockholders from a financial point of view. The fair market value of QT Imaging has been determined by the GigCapital5’s Board of Directors based upon standards generally accepted by the financial community, such as potential sales and the price for which comparable businesses or assets have been valued. The GigCapital5’s Board of Directors believes because of the financial skills and background of its directors, it was qualified to conclude that the proposed Business Combination was fair from a financial perspective to its stockholders and that QT Imaging’s fair market value was at least 80% of the assets held in the Trust Account (excluding the taxes payable on interest earned on the Trust Account) at the time of the agreement to enter into the proposed Business Combination. GigCapital5’s stockholders will be relying on the judgment of the GigCapital5’s Board of Directors with respect to such matters.

We may issue additional shares of common stock or preferred stock to complete our initial business combination or under an employee incentive plan upon or after consummation of our initial business combination, which would dilute the interest of our stockholders and likely present other risks.

Our Amended and Restated Certificate of Incorporation authorizes the issuance of 100,000,000 shares of common stock, and 1,000,000 shares of preferred stock, par value $0.0001 per share. We may issue a substantial number of additional shares of common stock or shares of preferred stock, par value $0.0001 per share, to complete our initial business combination or under an employee incentive plan upon or after consummation of our initial business combination. Although no such issuance will affect the per share amount available for redemption from the trust account, the issuance of additional common stock or preferred stock:

Resources could be wasted in researching acquisitions that are not consummated, which could materially adversely affect subsequent attempts to locate and acquire or merge with another business.

We anticipate that the investigation of each specific target business and the negotiation, drafting, and execution of relevant agreements, disclosure documents, and other instruments will require substantial management time and attention and substantial costs for accountants, attorneys and others. If we decide not to complete a specific initial business combination, the costs incurred up to that point for the proposed transaction likely would not be recoverable. Furthermore, if we reach an agreement relating to a specific target business, we may fail to consummate our initial business combination for any number of reasons including those beyond our control. Any such event will result in a loss to us of the related costs incurred, which could materially adversely affect subsequent attempts to locate and acquire or merge with another business. If we are unable to complete our initial business combination, our public stockholders may only receive $10.37 in principal plus accrued interest per share or potentially less than $10.37 in principal plus accrued interest per share on our redemption, and our warrants will expire worthless.

We may engage in our initial business combination with one or more target businesses that have relationships with entities that may be affiliated with our Founder, executive officers or directors, which may raise potential conflicts of interest.

We have not adopted a policy that expressly prohibits our directors, executive officers, security holders or affiliates from having a direct or indirect pecuniary or financial interest in any investment to be acquired or disposed of by us or in any transaction to which we are a party or have an interest. In light of the involvement of our Founder, executive officers, directors, and each of their affiliates, with other entities, we may decide to acquire one or more businesses affiliated with our Founder, executive officers or directors, or any of their affiliates. Our directors also serve as executive officers and board members for other entities. Our Founder, executive officers and directors are not currently aware of any specific opportunities for us to consummate our initial business combination with any entities

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with which they are affiliated, and there have been no discussions concerning a business combination with any such entity or entities. Although we will not be specifically focusing on, or targeting, any transaction with any affiliated entities, we would pursue such a transaction if we determined that such affiliated entity met our criteria for our initial business combination and such transaction was approved by a majority of our disinterested directors. Despite our agreement to obtain an opinion from an independent investment banking firm or another independent entity regarding the fairness to our stockholders from a financial point of view of a business combination with one or more domestic or international businesses affiliated with our executive officers, directors or existing holders, potential conflicts of interest still may exist and, as a result, the terms of the business combination may not be as advantageous to our public stockholders as they would be absent any conflicts of interest. Our directors have a fiduciary duty to act in the best interests of our stockholders, whether or not a conflict of interest may exist.

Since our Sponsor will lose its entire investment in us if our initial business combination is not consummated, and our executive officers and directors have significant financial interests in our Sponsor, a conflict of interest may arise in determining whether a particular acquisition target is appropriate for our initial business combination.

Our Sponsor, officers and directors will lose their entire investment in us and will not be reimbursed for any out-of-pocket expenses if an initial business combination is not consummated by the applicable deadline. Prior to GigCapital5’s Offering, the Sponsor purchased 10,047,500 Founder Shares for an aggregate purchase price of $25,000, or approximately $0.0024882 per share. However, 4,312,500 shares of common stock issued to the Sponsor were forfeited due to the over-allotment option being exercised in full by the Company’s underwriters in the Offering. Additionally, the Sponsor purchased 795,000 Private Placement Units simultaneously with the consummation of GigCapital5’s Offering for an aggregate purchase price of $7.95 million. Certain of GigCapital5’s directors and executive officers, including Dr. Avi Katz, Dr. Raluca Dinu, Dorothy D. Hayes, Raanan I. Horowitz, and Brad Weightman also have direct or indirect economic interest in such Private Placement Units and in the 5,735,000 Founder Shares owned by the Sponsor in the aggregate. The 5,735,000 Founder Shares owned by the Sponsor in the aggregate would have had an aggregate market value of $60.3 million based upon the closing price of $10.52 per Public Share on the NYSE on March 30, 2023. The 795,000 Private Placement Units held by the Sponsor would have had an aggregate market value of $8.4 million based upon the closing price of $10.65 per public unit on the NYSE on March 30, 2023. The Sponsor does not hold any warrants independent of what is included in the Private Placement Units. While the Private Placement Units have a trading price and value as set forth above, the Private Placement Units will be, upon completion of the business combination, broken into their constituent components of stock and warrants, and each of those separately trade and the value of each of those is $10.52 per Public Share and $0.0225 per public warrant on March 30, 2023. Additionally, the Sponsor, officers and directors do not currently have any unreimbursed out-of-pocket expenses in connection with the business combination. Initial Stockholders, including our Sponsor and our independent directors, hold a significant number of shares of our common stock. They will lose their entire investment in us if a business combination is not completed.

We may only be able to complete one business combination with the proceeds of the Offering, and the sale of the Private Placement Units, which will cause us to be solely dependent on a single business, which may have a limited number of products or services. This lack of diversification may negatively impact our operations and profitability.

The net proceeds from the Offering and the sale of the Private Placement Units provided us with $31,804,399.21 as of March 30, 2023 that we may use to complete our initial business combination. This includes $2,760,000 for the payment of deferred underwriting commissions to be paid upon the completion of the initial business combination as consideration of the underwriters using their commercially reasonable efforts to provide us with the following services: 1) originating and introducing us to potential targets for our initial business combination to us; 2) arranging non-deal roadshows on our behalf in connection with a proposed business combination; 3) assisting us in meeting our securities exchange listing requirements following the closing of the Offering; and 4) providing capital markets advice and liquidity to us following the closing of the Offering.

We may effectuate our initial business combination with a single target business or multiple target businesses simultaneously. However, we may not be able to effectuate our initial business combination with more than one target business because of various factors, including the existence of complex accounting issues and the requirement that we prepare and file pro forma financial statements with the SEC that present operating results and the financial condition of several target businesses as if they had been operated on a combined basis. By consummating our initial business

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combination with only a single entity, our lack of diversification may subject us to numerous economic, competitive and regulatory risks. Further, we would not be able to diversify our operations or benefit from the possible spreading of risks or offsetting of losses, unlike other entities, which may have the resources to complete several business combinations in different industries or different areas of a single industry. Accordingly, the prospects for our success may be:

This lack of diversification may subject us to numerous economic, competitive and regulatory risks, any or all of which may have a substantial adverse impact upon the particular industry in which we may operate subsequent to our initial business combination.

We may attempt to simultaneously consummate business combinations with multiple prospective targets, which may hinder our ability to consummate our initial business combination and give rise to increased costs and risks that could negatively impact our operations and profitability.

If we determine to simultaneously acquire several businesses that are owned by different sellers, we will need for each of such sellers to agree that our purchase of its business is contingent on the simultaneous closings of the other business combinations, which may make it more difficult for us, and delay our ability, to complete the initial business combination. With multiple business combinations, we could also face additional risks, including additional burdens and costs with respect to possible multiple negotiations and due diligence investigations (if there are multiple sellers) and the additional risks associated with the subsequent assimilation of the operations and services or products of the acquired companies in a single operating business. If we are unable to adequately address these risks, it could negatively impact our profitability and results of operations.

We may attempt to consummate our initial business combination with a private company about which little information is available, which may result in our initial business combination with a company that is not as profitable as we suspected, or at all.

In pursuing our acquisition strategy, we may seek to effectuate our initial business combination with a privately held company. By definition, very little public information exists about private companies, and we could be required to make our decision on whether to pursue a potential initial business combination on the basis of limited information, which may result in our initial business combination with a company that is not as profitable as we suspected, or at all.

Unlike some blank check companies, we do not have a specified maximum redemption threshold. The absence of such a redemption threshold may make it easier for us to consummate our initial business combination with which a substantial majority of our stockholders do not agree.

Since we have no specified percentage threshold for redemption contained in our Amended and Restated Certificate of Incorporation, our structure is different in this respect from the structure that has been used by many blank check companies. Historically, blank check companies would not be able to consummate an initial business combination if the holders of such company’s Public Shares voted against a proposed business combination and elected to redeem more than a specified maximum percentage of the shares sold in such company’s initial public offering, which percentage threshold was typically between 19.99% and 39.99%. As a result, many blank check companies were unable to complete a business combination because the amount of shares voted by their public stockholders electing redemption exceeded the maximum redemption threshold pursuant to which such company could proceed with its initial business combination. As a result, we may be able to consummate our initial business combination even though a substantial majority of our public stockholders do not agree with the transaction and have redeemed their shares or, if we seek stockholder approval of our initial business combination and do not conduct redemptions in connection with our business combination pursuant to the tender offer, have entered into privately negotiated agreements to sell their shares to us or our Founder, executive officers, directors, advisors or their affiliates. However, in no event will we redeem our Public Shares in an amount that would cause our net tangible assets to be less than $5,000,001 upon the consummation of our initial business combination. Furthermore, the redemption threshold may be further limited by the terms and conditions of our initial business combination. If too many public

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stockholders exercise their redemption rights so that we cannot satisfy the net tangible asset requirement or any net worth or cash requirements, we would not proceed with the redemption of our Public Shares and the related business combination, and instead may search for an alternate business combination.

We may be unable to obtain additional financing to complete our initial business combination or to fund the operations and growth of a target business, which could compel us to restructure or abandon a particular business combination. If we are unable to complete our initial business combination, our public stockholders may only receive $10.37 in principal plus accrued interest per share or potentially less than $10.37 in principal plus accrued interest per share on our redemption, and the warrants will expire worthless.

Although we believe that the net proceeds of the IPO and the sale of the Private Placement Units and Founder Shares, including the interest earned on the proceeds held in the trust account, that may be available to us for our initial business combination, may be sufficient to allow us to consummate our initial business combination we cannot be certain that the capital after final redemptions will be sufficient to complete the transaction. If the net proceeds of the Offering and the sale of the Private Placement Units and Founder Shares after redemptions prove to be insufficient, either because of the size of our initial business combination, the depletion of the available net proceeds in search of a target business, the obligation to repurchase for cash a significant number of shares from stockholders who elect redemption in connection with our initial business combination or the terms of negotiated transactions to purchase shares in connection with our initial business combination, we may be required to seek additional financing or to abandon the proposed business combination. Financing may not be available on acceptable terms, if at all. PIPE financing of business combinations has become harder to obtain beginning in the second half of 2021 and continuing during 2022 and into 2023 than it was during most of 2020 and the first half of 2021, and to the extent that it has been available, the terms have tended to have more structure than just the issuance of shares of common stock at a price of $10.00 per share. To the extent that additional financing proves to be unavailable when needed to consummate our initial business combination, we would be compelled to either restructure the transaction or abandon that particular initial business combination and seek an alternative target business candidate. If we are unable to complete our initial business combination, our public stockholders may only receive $10.37 in principal plus accrued interest per share or potentially less than $10.37 in principal plus accrued interest per share on our redemption, and the warrants will expire worthless. In addition, even if we do not need additional financing to consummate our initial business combination, we may require such financing to fund the operations or growth of the target business. The failure to secure additional financing could have a material adverse effect on the continued development or growth of the target business. None of our officers, directors or stockholders is required to provide any financing to us in connection with or after our initial business combination.

Our Initial Stockholders control a substantial interest in us and thus may influence certain actions requiring a stockholder vote.

Upon consummation of the Offering and after the September 2022 partial redemptions and the March 2023 partial redemptions, our Initial Stockholders (and their permitted transferees) own approximately 68.4% of the issued and outstanding shares of our common stock. None of our Founder, executive officers, directors, or any of their affiliates indicated any intention to purchase public units in the Offering or any public units or shares of common stock from persons in the open market or in private transactions. However, our Initial Stockholders or any of their affiliates could determine in the future to make such purchases in the open market or in private transactions, to the extent permitted by law, in order to influence the vote or magnitude of the number of stockholders seeking to tender their shares to us. In connection with any vote for a proposed business combination our Initial Stockholders have agreed to vote the shares of common stock held by them immediately before the Offering, the shares of common stock underlying the Private Placement Units, as well as any shares of common stock acquired in the Offering or in the aftermarket in favor of such proposed business combination.

Because we must furnish our stockholders with target business financial statements, we may lose the ability to complete an otherwise advantageous initial business combination with some prospective target businesses.

The United States federal proxy rules require that a proxy statement with respect to a vote on a business combination meeting certain financial significance tests include historical and/or pro forma financial statement disclosure in periodic reports. We will include the same financial statement disclosure in connection with our tender offer documents, whether or not they are required under the tender offer rules. These financial statements must be prepared in accordance with, or be reconciled to, GAAP or IFRS, and the historical financial statements must be

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audited in accordance with the standards of the Public Company Accounting Oversight Board (United States). These financial statement requirements may limit the pool of potential target businesses we may acquire because some targets may be unable to provide such statements in time for us to disclose such statements in accordance with federal proxy rules and consummate our initial business combination within our 18-month time frame (or up to 24 in total months if the Company extends the period of time to consummate a business combination in accordance with its Amended and Restated Certificate of Incorporation).

Redeeming stockholders may be unable to sell their securities when they wish to in the event that the proposed business combination is not approved.

We will require public stockholders who wish to redeem their shares of common stock in connection with any proposed business combination to comply with the delivery requirements discussed above for redemption. If such proposed business combination is not consummated, we will promptly return such certificates to the tendering public stockholders. Accordingly, investors who attempted to redeem their shares in such a circumstance will be unable to sell their securities after the failed acquisition until we have returned their securities to them. The market price for our common stock may decline during this time and you may not be able to sell your securities when you wish to, even while other stockholders that did not seek redemption may be able to sell their securities.

If we are unable to complete an initial business combination, our public stockholders may receive only approximately $10.37 in principal plus accrued interest per share on the liquidation of the Trust Account (or less than $10.37 in principal plus accrued interest per share in certain circumstances where a third party brings a claim against us that our Sponsor is unable to indemnify), and our warrants will expire worthless.

If we are unable to complete an initial business combination by the applicable deadline, our public stockholders may receive only approximately $10.37 in principal plus accrued interest per share on the liquidation of the Trust Account (or less than $10.37 in principal plus accrued interest per share in certain circumstances where a third-party brings a claim against us that our Sponsor is unable to indemnify (as described herein)) and our warrants will expire worthless.

We may not be able to complete our initial business combination within the prescribed time frame, in which case we would cease all operations except for the purpose of winding up and we would redeem our Public Shares and liquidate.

We must complete our initial business combination within 24 months from the closing of the Offering. We may not be able to find a suitable target business and complete our initial business combination within such time period or we may be unable to consummate a business combination due to a downturn in industry or economic conditions or due to other factors that may occur, including due to the outbreak of the COVID-19 coronavirus pandemic, the measures being taken to counter it, and volatility in valuations in the financial markets that are resulting from the imposition of such measures and the pending health crisis. If we have not completed our initial business combination within 24 months from the closing of the Offering, we will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than 10 business days thereafter, redeem 100% of the outstanding Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the trust account, including any interest earned on the funds held in the trust account net of interest that may be used by us to pay our franchise and income taxes payable divided by the number of then outstanding Public Shares, which redemption will completely extinguish public stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of our remaining stockholders and our Board of Directors, dissolve and liquidate, subject (in the case of (ii) and (iii) above) to our obligations under Delaware law to provide for claims of creditors and the requirements of other applicable law.

If we are unable to consummate our initial business combination within 24 months from the closing of the Offering, our public stockholders may be forced to wait beyond such period before redemption from our trust account.

If we are unable to consummate our initial business combination within 24 months from the closing of the Offering, we will, as promptly as reasonably possible but not more than 10 business days thereafter, distribute the aggregate amount then on deposit in the trust account (net of taxes payable and less up to $100,000 of interest to pay dissolution expenses), pro rata to our public stockholders by way of redemption and cease all operations except for

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the purposes of winding up of our affairs by way of a voluntary liquidation, as further described herein. Any redemption of public stockholders from the trust account shall be effected as required by our Amended and Restated Certificate of Incorporation prior to our commencing any voluntary liquidation.

If we are required to liquidate prior to distributing the aggregate amount then on deposit in the trust account (net of taxes payable and less up to $100,000 of interest to pay dissolution expenses) pro rata to our public stockholders, then such winding up, liquidation and distribution must comply with the applicable provisions of the DGCL. In that case, investors may be forced to wait beyond 24 months from the closing of the Offering before the redemption proceeds of our trust account become available to them, and they receive the return of their pro rata portion of the proceeds from our trust account. Except as otherwise described herein, we have no obligation to return funds to investors prior to the date of any redemption required as a result of our failure to consummate our initial business combination within the period described above or our liquidation, unless we consummate our initial business combination prior thereto and only then in cases where investors have sought to redeem their shares of common stock. Only upon any such redemption of Public Shares as we are required to effect or any liquidation will public stockholders be entitled to distributions if we are unable to complete our initial business combination.

The ability of our public stockholders to exercise their redemption rights may not allow us to effectuate the most desirable business combination or optimize our capital structure.

If our initial business combination requires us to use substantially all of our cash to pay the purchase price, because we will not know how many public stockholders may exercise redemption rights, we may either need to reserve part of the trust account for possible payment upon such redemption, or we may need to arrange third party financing to help fund our initial business combination. In the event that the acquisition involves the issuance of our stock as consideration, we may be required to issue a higher percentage of our stock to make up for a shortfall in funds. Raising additional funds to cover any shortfall may involve dilutive equity financing or incurring indebtedness at higher than desirable levels. This may limit our ability to effectuate the most attractive business combination available to us.

We may be unable to consummate an initial business combination if a target business requires that we have a certain amount of cash at closing, in which case public stockholders may have to remain stockholders of our company and wait until our redemption of the Public Shares to receive a pro rata share of the trust account or attempt to sell their shares in the open market.

A potential target may make it a closing condition to our initial business combination that we have a certain amount of cash in excess of the $5,000,001 of net tangible assets we are required to have pursuant to our organizational documents available at the time of closing. If the number of our public stockholders electing to exercise their redemption rights has the effect of reducing the amount of money available to us to consummate an initial business combination below such minimum amount required by the target business and we are not able to locate an alternative source of funding, we will not be able to consummate such initial business combination and we may not be able to locate another suitable target within the applicable time period, if at all. In that case, public stockholders may have to remain stockholders of our company and wait the full 24 months from the closing of the Offering in order to be able to receive a portion of the trust account, or attempt to sell their shares in the open market prior to such time, in which case they may receive less than they would have in a liquidation of the trust account.

If GigCapital5 is unable to consummate a business combination, including the proposed Business Combination, its public stockholders may be forced to wait until after September 28, 2023 before receiving distributions from the Trust Account.

GigCapital5 is a development stage blank check company, and as it has no operating history and is subject to a mandatory liquidation and subsequent dissolution requirement. GigCapital5 currently has until September 28, 2023, to complete a business combination (unless such date is subsequently extended by the stockholders of GigCapital5). GigCapital5 has no obligation to return funds to investors prior to such date unless (i) it consummates a business combination prior thereto or (ii) it seeks to amend its current Amended and Restated Certificate of Incorporation prior to consummation of a business combination, and only then in cases where investors have sought to convert or sell their shares to GigCapital5. Only after the expiration of this full time period will public security holders be entitled to distributions from the Trust Account if GigCapital5 is unable to complete a business combination. Accordingly, investors’ funds may be unavailable to them until after such date and to liquidate their investment, public security

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holders may be forced to sell their Public Shares or warrants, potentially at a loss. In addition, if GigCapital5 fails to complete an initial business combination by September 28, 2023 (unless the time for such completion is extended), there will be no redemption rights or liquidating distributions with respect to the warrants, which will expire worthless, unless GigCapital5 amends its certificate of incorporation to extend its life and certain other agreements it has entered into.

If third parties bring claims against GigCapital5, the proceeds held in trust could be reduced and the per-share redemption price received by stockholders may be less than $10.37 in principal plus accrued interest per share.

GigCapital5’s placing of funds in trust may not protect those funds from third party claims against GigCapital5. GigCapital5 has sought to have all vendors and service providers GigCapital5 engages and prospective target businesses GigCapital5 negotiated with execute agreements with GigCapital5 waiving any right, title, interest or claim of any kind in or to any monies held in the Trust Account for the benefit of the GigCapital5’s public stockholders, they may not execute such agreements. Furthermore, even if such entities execute such agreements with GigCapital5, they may seek recourse against the Trust Account. A court may not uphold the validity of such agreements. Accordingly, the proceeds held in trust could be subject to claims which could take priority over those of the GigCapital5’s public stockholders. If GigCapital5 is unable to complete a business combination and distribute the proceeds held in trust to GigCapital5’s public stockholders, the Sponsor has agreed (subject to certain exceptions described elsewhere in this proxy statement/prospectus) that it will be liable to ensure that the proceeds in the Trust Account are not reduced below $10.10 per share by the claims of target businesses or claims of vendors or other entities that are owed money by GigCapital5 for services rendered or contracted for or products sold to GigCapital5. However, it may not be able to meet such obligation. Therefore, the per-share distribution from the Trust Account may be less than $10.37 in principal plus accrued interest, plus interest, due to such claims.

Additionally, if GigCapital5 is forced to file a bankruptcy case or an involuntary bankruptcy case is filed against GigCapital5 which is not dismissed, the proceeds held in the Trust Account could be subject to applicable bankruptcy law, and may be included in GigCapital5’s bankruptcy estate and subject to the claims of third parties with priority over the claims of the GigCapital5’s stockholders. To the extent any bankruptcy claims deplete the Trust Account, GigCapital5 may not be able to return to the GigCapital5’s public stockholders at least $10.37 in principal plus accrued interest. The Sponsor may not have sufficient funds to satisfy its indemnity obligations, as its only assets are securities of GigCapital5. GigCapital5 has not asked the Sponsor to reserve for such indemnification obligations. As a result, if any such claims were successfully made against the Trust Account, the funds available for the GigCapital5’s initial business combination, including the proposed business combination, and redemptions could be reduced to less than $10.37 in principal plus accrued interest per Public Share.

If third parties bring claims against us, the proceeds held in the Trust Account could be reduced and the per share redemption amount received by stockholders may be less than $10.37 in principal plus accrued interest per share.

Our placing of funds in the Trust Account may not protect those funds from third-party claims against us. Although we have sought and will continue to seek to have all vendors, service providers, prospective target businesses, including QT Imaging, or other entities with which we do business execute agreements with us waiving any right, title, interest or claim of any kind in or to any monies held in the Trust Account for the benefit of our public stockholders, such parties may not execute such agreements, or even if they execute such agreements they may not be prevented from bringing claims against the Trust Account, including, but not limited to, fraudulent inducement, breach of fiduciary responsibility or other similar claims, as well as claims challenging the enforceability of the waiver, in each case in order to gain advantage with respect to a claim against our assets, including the funds held in the Trust Account. If any third-party refuses to execute an agreement waiving such claims to the monies held in the Trust Account, our management will perform an analysis of the alternatives available to it and will only enter into an agreement with a third party that has not executed a waiver if management believes that such third party’s engagement would be significantly more beneficial to us than any alternative. Morrow Sodali LLC, our proxy solicitor, did not execute agreements with us waiving such claims to the monies held in the Trust Account.

Examples of possible instances where we may engage a third party that refuses to execute a waiver include the engagement of a third-party consultant whose particular expertise or skills are believed by management to be significantly superior to those of other consultants that would agree to execute a waiver or in cases where management is unable to find a service provider willing to execute a waiver. In addition, there is no guarantee that such entities will

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agree to waive any claims they may have in the future as a result of, or arising out of, any negotiations, contracts or agreements with us and will not seek recourse against the Trust Account for any reason. Upon redemption of our Public Shares, if we are unable to complete our initial business combination by September 28, 2023, or upon the exercise of a redemption right in connection with the proposed Business Combination, we will be required to provide for payment of claims of creditors that were not waived that may be brought against us within the 10 years following redemption. Accordingly, the per share redemption amount received by public stockholders could be less than the $10.37 in principal plus accrued interest per share held in the Trust Account as of December 31, 2022, due to claims of such creditors. Our Sponsor has agreed that it will be liable to us if and to the extent any claims by a vendor for services rendered or products sold to us, or a prospective target business, with which we have discussed entering into a transaction agreement, reduce the amount of funds in the Trust Account to below (i) $10.37 in principal plus accrued interest per Public Share or (ii) such lesser amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account due to reductions in the value of the trust assets, in each case net of the interest which may be withdrawn to pay taxes. This liability will not apply with respect to any claims by a third party who executed a waiver of any and all rights to seek access to the Trust Account and except as to any claims under our indemnity of the underwriters of our initial public offering against certain liabilities, including liabilities under the Securities Act. Moreover, in the event that an executed waiver is deemed to be unenforceable against a third party, then our Sponsor will not be responsible to the extent of any liability for such third-party claims. We have not independently verified whether our Sponsor has sufficient funds to satisfy its indemnity obligations and believe that our Sponsor’s only assets are our securities. We have not asked our Sponsor to reserve for such indemnification obligations. Therefore, we cannot assure you that our Sponsor would be able to satisfy those obligations. As a result, if any such claims were successfully made against the Trust Account, the funds available for our initial business combination and redemptions could be reduced to less than $10.37 in principal plus accrued interest per Public Share. In such event, we may not be able to complete our initial business combination, and you would receive such lesser amount per share in connection with any redemption of your Public Shares. None of our officers will indemnify us for claims by third parties including, without limitation, claims by vendors and prospective target businesses.

Warrants, Private Placement Warrants and any Assumed Warrants will become exercisable for Combined Company’s common stock, which would increase the number of shares eligible for future resale in the public market and result in dilution to our stockholders.

If the proposed Business Combination is completed, outstanding warrants to purchase an aggregate of 23,000,000 shares of Combined Company’s common stock will become exercisable in accordance with the terms of the warrant agreement governing those securities, as well as Private Placement Warrants to purchase an aggregate of up to 795,000 shares of Combined Company’s common stock, and any warrants that exist at the closing that may be assumed in the proposed Business Combination. These warrants and Private Placement Warrants will become exercisable 30 days after the completion of the proposed Business Combination. The exercise price of these warrants and Private Placement Warrants will be $11.50 per share. The Assumed Warrants will be exercisable following the closing and will have an adjusted exercise price in accordance with the terms of the Business Combination Agreement. To the extent such warrants, Private Placement Warrants and Assumed Warrants are exercised, additional shares of Combined Company’s common stock will be issued, which will result in dilution to the holders of Combined Company’s common stock and increase the number of shares eligible for resale in the public market. The dilution, as a percentage of outstanding shares, caused by the exercise of the warrants, Private Placement Warrants and Assumed Warrants will increase if a large number of our public stockholders elect to redeem their shares in connection with the proposed Business Combination. Further, the redemption of Public Shares without any accompanying redemption of warrants will increase the dilutive effect of the exercise of warrants and Private Placement Warrants. Sales of substantial numbers of such shares in the public market or the fact that such warrants, Private Placement Warrants and Assumed Warrants may be exercised could adversely affect the market price of Combined Company’s common stock. However, there is no guarantee that the warrants and Private Placement Warrants will ever be in-the-money prior to their expiration (the Assumed Warrants will have to be in-the-money at the closing), and the historical trading prices for shares of GigCapital5 Common Stock have varied between a low of approximately $9.81 per share on January 11, 2022 to a high of approximately $10.64 per share on March 24, 2023, and have not approached the $11.50 per share exercise price for the warrants and Private Placement Warrants. As such, the warrants and Private Placement Warrants may expire worthless.

The consummation of the proposed Business Combination is subject to a number of conditions and if those conditions are not satisfied or waived, the Business Combination Agreement may be terminated in accordance

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with its terms and the Business Combination may not be completed.

The Business Combination Agreement is subject to a number of conditions which must be fulfilled in order to complete the proposed Business Combination. Those conditions include: approval of the Business Combination Agreement by QT Imaging stockholders, approval of the proposals required to effect the proposed Business Combination by GigCapital5 stockholders, as well as receipt of certain requisite regulatory approvals, absence of orders prohibiting completion of the proposed Business Combination, effectiveness of the registration statement of which the proxy statement/prospectus filed with the SEC is a part, approval of the shares of Combined Company’s common stock to be issued to GigCapital5 stockholders for listing on the NYSE, the resignation of specified GigCapital5 executive officers and directors, the accuracy of the representations and warranties by both parties (subject to the materiality standards set forth in the Business Combination Agreement) and the performance by both parties of their covenants and agreements. These conditions to the closing may not be fulfilled in a timely manner or at all, and, accordingly, the proposed Business Combination may not be completed. In addition, the parties can mutually decide to terminate the Business Combination Agreement at any time, before or after stockholder approval, or GigCapital5 or QT Imaging may elect to terminate the Business Combination Agreement in certain other circumstances.

The parties to the Business Combination Agreement may amend the terms of the Business Combination Agreement or waive one or more of the conditions to the proposed Business Combination, and the exercise of discretion by our directors and officers in agreeing to changes to the terms of or waivers of closing conditions in the Business Combination Agreement may result in a conflict of interest when determining whether such changes to the terms of the Business Combination Agreement or waivers of conditions are appropriate and in the best interests of our stockholders.

In the period leading up to the closing, other events may occur that, pursuant to the Business Combination Agreement, would require us to agree to amend the Business Combination Agreement, to consent to certain actions or to waive certain closing conditions or other rights that we are entitled to under the Business Combination Agreement. Such events could arise because of changes in the course of QT Imaging’s business, a request by QT Imaging to undertake actions that would otherwise be prohibited by the terms of the Business Combination Agreement or the occurrence of other events that would have a material adverse effect on QT Imaging’s business and would entitle us to terminate the Business Combination Agreement. In any of such circumstances, it would be in our discretion, acting through GigCapital5’s Board of Directors, to grant our consent or waive our rights. The existence of the financial and personal interests of the directors and officers described elsewhere in the proxy statement/prospectus filed with the SEC may result in a conflict of interest on the part of one or more of the directors or officers between what he or she may believe is best for GigCapital5 and our stockholders and what he or she may believe is best for himself or herself or his or her affiliates in determining whether or not to take the requested action.

For example, it is a condition to GigCapital5’s obligation to close the proposed Business Combination that QT Imaging’s representations and warranties be true and correct as of the closing in all respects subject to the applicable materiality standards as set forth in the Business Combination Agreement. However, if GigCapital5’s Board of Directors determines that any such breach is not material to the business of QT Imaging, then GigCapital5’s Board of Directors may elect to waive that condition and close the proposed Business Combination. The parties will not waive the condition that GigCapital5’s stockholders approve the proposed Business Combination.

As of the date of this Annual Report, we do not believe there will be any material changes or waivers that our directors and officers would be likely to make after stockholder approval of the proposed Business Combination has been obtained. While certain changes could be made without further stockholder approval, if there is a change to the terms of the proposed Business Combination that would have a material impact on the stockholders, we will be required to circulate a new or amended proxy statement or supplement thereto and resolicit the vote of our stockholders with respect to the Business Combination.

Termination of the Business Combination Agreement could negatively impact GigCapital5.

If the proposed Business Combination is not completed for any reason, including as a result of QT Imaging stockholders declining to adopt the Business Combination Agreement or GigCapital5 stockholders declining to approve the proposals required to affect the Business Combination, the ongoing business of GigCapital5 may be