Exhibit 10.1

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

SECOND AMENDED AND RESTATED PROMISSORY NOTE

November 28, 2022

Principal Amount: $480,000.00

GigCapital5, Inc., a Delaware corporation and blank check company (the “Maker”), promises to pay to the order of GigAcquisitions5, LLC, a Delaware limited liability company, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of Four Hundred and Eighty Thousand Dollars ($480,000.00) in lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note.

1. Principal. The principal balance of this Note shall be payable by the Maker on the earlier of: (i) the date on which Maker consummates its initial business combination or (ii) the date that the winding up of the Maker is effective (such date, the “Maturity Date”). The principal balance may be prepaid at any time, at the election of Maker. Under no circumstances shall any individual, including but not limited to any executive officer, director, employee or stockholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder.

2. Interest. No interest shall accrue on the unpaid principal balance of this Note.

3. Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal balance of this Note.

4. Events of Default. The following shall constitute an event of default (“Event of Default”):

(a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5) business days of the date specified above.

(b) Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in furtherance of any of the foregoing.

(c) Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days.

5. Remedies.

(a) Upon the occurrence and during the continuance of an Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b) Upon the occurrence and during the continuance of an Event of Default specified in Sections 4(b) and 4(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee.

6. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired by Payee.

7. Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder.

8. Notices. All notices, statements or other documents which are required or contemplated by this Note shall be made in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail.

9. Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF DELAWARE, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

10. Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

11. Trust Waiver. Notwithstanding anything herein to the contrary, the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account (the “Trust Account”) to be established in connection with Maker’s initial public offering, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the Trust Account for any reason whatsoever; provided however that upon the consummation of the initial business combination, Maker shall repay the principal balance of this Note out of the proceeds released to Maker from the Trust Account.

12. Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

13. Assignment. No assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void.

14. Restatement. This Note amends, restates, supersedes and replaces that certain Promissory Note dated as of October 26, 2022, made in the principal amount of Three Hundred and Twenty Thousand Dollars ($320,000.00) by Maker, payable to Payee, as amended (the “Prior Note”); provided, however, that the execution and delivery by the undersigned of this Note shall not, in any manner or circumstance, be deemed to be a payment of, a novation of or to have terminated, extinguished or discharged any of Maker’s indebtedness evidenced by the Prior Note, all of which indebtedness shall continue under and shall hereinafter be evidenced and governed by this Note. Any inconsistency between the terms of this Note and the Prior Note shall be controlled by the terms hereof.

[Signature page follows]

IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed by the undersigned as of the day and year first above written.

[Signature Page to Second Amended and Restated Promissory Note]

Exhibit 10.2

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

SECOND AMENDED AND RESTATED PROMISSORY NOTE

November 28, 2022

Principal Amount: $195,000.00

GigCapital5, Inc., a Delaware corporation and blank check company (the “Maker”), promises to pay to the order of GigAcquisitions5, LLC, a Delaware limited liability company, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of One Hundred and Ninety-Five Thousand Dollars ($195,000.00) in lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice in accordance with the provisions of this Note.

1. Principal. The principal balance of this Note shall be payable by the Maker on the earlier of: (i) the date on which Maker consummates its initial business combination or (ii) the date that the winding up of the Maker is effective (such date, the “Maturity Date”). The principal balance may be prepaid at any time, at the election of Maker. Under no circumstances shall any individual, including but not limited to any executive officer, director, employee or stockholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder.

2. Interest. No interest shall accrue on the unpaid principal balance of this Note.

3. Optional Conversion.

(a) Upon consummation of the business combination and at the Payee’s option, at any time prior to payment in full of the principal balance of this Note, the Payee may elect to convert all or any portion of the Note into that number of units of the post-business combination entity (the “New Units”) equal to: (i) the portion of the principal amount of the Note being converted pursuant to this Section 3, divided by (ii) $10.00, rounded down to the nearest whole number. Each New Unit shall have the same terms and conditions as private placement units issued simultaneously with the Maker’s initial public offering.

(b) Upon any complete or partial conversion of the principal amount of this Note (i) such principal amount shall be so converted and such converted portion of this Note shall become fully paid and satisfied, (ii) the Payee shall surrender and deliver this Note, duly endorsed, to Maker or such other address which Maker shall designate against delivery of the New Units, (iii) Maker shall promptly deliver a new duly executed Note to the Payee in the principal amount that remains outstanding, if any, after any such conversion and (iv) in exchange for all or any portion of the surrendered Note described in Section 3(a), Maker shall deliver to Payee the New Units, which shall bear such legends as are required, in the opinion of counsel to Maker or by any other agreement between Maker and the Payee and applicable state and federal securities laws.

(c) The Maker shall pay any and all issue and other taxes that may be payable with respect to any issue or delivery of the New Units upon conversion of this Note pursuant hereto; provided, however, that the Payee shall pay any transfer taxes resulting from any transfer requested by the Payee in connection with any such conversion.

4. Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal balance of this Note.

5. Events of Default. The following shall constitute an event of default (“Event of Default”):

(a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due pursuant to this Note within five (5) business days of the date specified above.

(b) Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in furtherance of any of the foregoing.

(c) Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days.

6. Remedies.

(a) Upon the occurrence and during the continuance of an Event of Default specified in Section 5(a) hereof, Payee may, by written notice to Maker, declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b) Upon the occurrence and during the continuance of an Event of Default specified in Sections 5(b) and 5(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action on the part of Payee.

7. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired by Payee.

8. Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability hereunder.

9. Notices. All notices, statements or other documents which are required or contemplated by this Note shall be made in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number most recently provided to such party or such other address or fax number as may be designated in writing by such

party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail.

10. Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF DELAWARE, WITHOUT REGARD TO CONFLICT OF LAW PROVISIONS THEREOF.

11. Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

12. Trust Waiver. Notwithstanding anything herein to the contrary, the Payee hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account (the “Trust Account”) to be established in connection with Maker’s initial public offering, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the Trust Account for any reason whatsoever; provided however that upon the consummation of the initial business combination, Maker shall repay the principal balance of this Note out of the proceeds released to Maker from the Trust Account.

13. Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

14. Assignment. No assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void.

14. Restatement. This Note amends, restates, supersedes and replaces that certain Promissory Note dated October 26, 2022, made in the principal amount of One Hundred and Thirty Thousand Dollars ($130,000.00) by Maker, payable to Payee, as amended (the “Prior Note”); provided, however, that the execution and delivery by the undersigned of this Note shall not, in any manner or circumstance, be deemed to be a payment of, a novation of or to have terminated, extinguished or discharged any of Maker’s indebtedness evidenced by the Prior Note, all of which indebtedness shall continue under and shall hereinafter be evidenced and governed by this Note. Any inconsistency between the terms of this Note and the Prior Note shall be controlled by the terms hereof.

[Signature page follows]

IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed by the undersigned as of the day and year first above written.

[Signature Page to Second Amended and Restated Promissory Note]

Exhibit 99.1

GigCapital5, Inc. Confirms Receipt of Sponsor Funds to Extend Period of Time to Consummate Business

Combination and for Additional Working Capital

Palo Alto, CA – November 28, 2022 – GigCapital5, Inc. (“GigCapital5” or the “Company”) (NYSE: GIA.U; GIA; GIA.WS), a blank check company, also commonly referred to as a special purpose acquisition company, or SPAC, formed for the purpose of entering into a merger, capital stock exchange, asset acquisition, stock purchase reorganization or similar business combination with one or more businesses or entities, announced that GigAcquisitions5, LLC (the “Sponsor”), has funded the trust account maintained with Continental Stock Transfer & Trust Company (the “Trust Account”) with an additional $160,000 payment. In consideration for the deposit, the Company has amended and restated the existing unsecured interest free promissory note to include the additional loan amount, so the aggregate principal amount under such promissory note together with similar deposits made on September 26, 2022 and October 26, 2022 was increased to the total of $480,000. Such principal amount will be repaid in connection with the closing of GigCapital5’s initial business combination. As a result of the deposits into the Trust Account, the period of time that GigCapital5 has to consummate a business combination has been extended by a month to December 28, 2022 (and may be extended thereafter on a monthly basis until March 28, 2023 upon payment of a monthly fee equal to $160,000).

In addition, on November 28, 2022, the Company amended the existing working capital promissory note issued to the Sponsor to include the additional loan amount of $65,000, so the aggregate principal amount under such working capital promissory note was increased to the total of $195,000. The promissory note is non-interest bearing and may be converted at the Sponsor’s election upon the consummation of the initial business combination into units identical to the private placement units issued in connection with the Company’s initial public offering at a price of $10.00 per unit.

About GigCapital5

GigCapital5 is a blank check company, also commonly referred to as a special purpose acquisition company, or SPAC, formed for the purpose of entering into a merger, capital stock exchange, asset acquisition, stock purchase reorganization or similar business combination with one or more businesses or entities. While GigCapital5’s efforts to identify a target business may span many industries, the focus of GigCapital5’s search is for prospects within the technology, media and telecommunications, aerospace and defense, advanced medical equipment, intelligent automation and sustainable industries. GigCapital5 was sponsored by GigAcquisitions5, LLC, which was founded by GigFounders, LLC, each a member entity of GigCapital Global, and formed for the purpose of entering into a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization, or similar business combination with one or more businesses.

Forward-Looking Statements

This press release includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. The expectations, estimates, and projections of GigCapital5 may differ from their actual results and consequently, you should not rely on these forward-looking statements as predictions of future events. Any statements contained herein that are not statements of historical fact may be deemed to be forward-looking statements. In addition, any statements that refer to characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. Words such as “expect,” “estimate,” “project,” “budget,” “forecast,” “anticipate,” “intend,” “plan,” “may,” “will,” “could,” “should,” “believes,” “predicts,” “potential,” “continue,” and similar expressions are intended to identify such forward-looking statements. These forward-looking statements include, without limitation, future extensions, expectations with respect to closing of the proposed business combination, the repayment of the promissory note upon such closing of the proposed business combination, and the timing of the completion of the proposed business combination. There can be no assurance that future developments affecting GigCapital5 will be those that we have anticipated. These forward-looking statements involve significant risks and uncertainties that could cause the actual results to differ materially from the expected results. Most of these factors are outside of the control of GigCapital5 and the party with which it has proposed to consummate a business combination, QT Imaging, Inc. (“QT”), and are difficult to predict. Factors that may cause such differences include, but are not limited to: (1) the occurrence of any event,

change or other circumstances that could give rise to the termination of the negotiations and any subsequent definitive agreements with respect to the proposed business combination, and the possibility that the terms and conditions set forth in any definitive agreements with respect to the proposed business combination may differ materially from the terms and conditions set forth in the term sheet, (2) the outcome of any legal proceedings that may be instituted against the parties following the announcement of the proposed business combination and any definitive agreements with respect thereto; (3) the inability to complete the proposed business combination, including due to failure to obtain approval of the stockholders of GigCapital5 and QT or other conditions to closing, including the failure of the stockholders of GigCapital5 to approve the extension of time for GigCapital5 to consummate its initial business combination at the upcoming annual meeting of stockholders of GigCapital5 that GigCapital5 intends to hold; (4) the impact of the COVID-19 pandemic on (x) the parties’ ability to negotiate and consummate the proposed business combination and (y) the business of QT and the surviving company; (5) the receipt of an unsolicited offer from another party for an alternative business transaction that could interfere with the proposed business combination; (6) the inability to obtain or maintain the listing of the surviving company’s common stock on The New York Stock Exchange or any other national stock exchange following the proposed business combination; (7) the risk that the proposed business combination disrupts current plans and operations as a result of the announcement and consummation of the proposed business combination; (8) the ability to recognize the anticipated benefits of the proposed business combination, which may be affected by, among other things, competition, the ability of the surviving company to grow and manage growth profitably and retain its key employees; (9) costs related to the proposed business combination; (10) changes in applicable laws or regulations; (11) the demand for QT’s and the surviving company’s services together with the possibility that QT or the surviving company may be adversely affected by other economic, business, and/or competitive factors; (12) risks and uncertainties related to QT’s business, including, but not limited to, the ability of QT to increase sales of its output products in accordance with its plan; and (13) other risks and uncertainties included in (x) the “Risk Factors” sections of the most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q filed with the SEC by GigCapital5 and (y) other documents filed or to be filed with the SEC by GigCapital5. The foregoing list of factors is not exclusive. 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. You should not place undue reliance upon any forward-looking statements, which speak only as of the date made. All forward-looking statements in this press release are based on information available to GigCapital5 as of the date hereof, and GigCapital5 assumes no obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Additional Information and Where to Find It

If a definitive agreement is entered into in connection with the proposed business combination, GigCapital5 will prepare a proxy statement/prospectus (the “GigCapital5 proxy statement/prospectus”) to be filed with the SEC and mailed to GigCapital5’s stockholders. GigCapital5 urges investors and other interested persons to read, when available, the GigCapital5 proxy statement/prospectus, as well as other documents filed with the SEC, because these documents will contain important information about the proposed business combination. Such persons can also read GigCapital5’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “GigCapital5 Annual Report”), for a description of the security holdings of its officers and directors and their respective interests as security holders in the consummation of the transactions described herein. The GigCapital5 proxy statement/prospectus, once available, and GigCapital5’s Annual Report can be obtained, without charge, at the SEC’s web site (http://www.sec.gov).

Participants in the Solicitation

GigCapital5, QT and their respective directors, executive officers and other members of their management and employees, under SEC rules, may be deemed to be participants in the solicitation of proxies of GigCapital5 stockholders in connection with the proposed business combination. Investors and security holders may obtain more detailed information regarding the names, affiliations and interests of GigCapital5’s directors and officers in its Annual Report on Form 10-K for the fiscal year ended December 31, 2021, which was filed with the SEC on March 31, 2022. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies to GigCapital5’s stockholders in connection with the proposed business combination will be set forth in the proxy statement/prospectus for the proposed business combination when available. Information concerning the interests of GigCapital5’s and QT’s equity holders and participants in the solicitation, which may, in some cases, be different than those of GigCapital5’s and QT’s equity holders generally, will be set forth in the proxy statement/prospectus relating to the proposed business combination when it becomes available.

No Offer or Solicitation

This press release shall not constitute a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the proposed business combination or the extension of time for GigCapital5 to consummate its initial business combination. This press release shall also not constitute an offer to sell or the solicitation of an offer to buy any securities, nor shall there be any sale of securities in any jurisdiction in which the offer, solicitation, or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction. No offering of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

GigCapital5, Inc. Contact:

Brian Ruby, ICR, Brian.Ruby@icrinc.com