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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant Filed by a Party other than th

Key Takeaway: AND EXCHANGE COMMISSION Washington, D.C. 20549 Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant Filed by a Party other Check the appropriate box: of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy S

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AND EXCHANGE COMMISSION
Washington, D.C. 20549
Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
Filed by the Registrant
Filed by a Party other
Check the appropriate box:
of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
Payment of Filing Fee (Check the appropriate box):
SUPPLEMENT TO PROXY STATEMENT
Dated February 16, 2024
The following disclosures in this proxy supplement (the Supplement ) supplement, and should be read in conjunction with,
the disclosures contained in the definitive proxy statement/prospectus (the BCA Proxy Statement ), filed with the U.S. Securities and Exchange Commission (the SEC ) on February 7,
2024, which in turn should be read in its entirety. To the extent the information set forth herein differs from or updates information contained in the BCA Proxy Statement, the information set forth herein shall supersede or supplement the
information in the BCA Proxy Statement. All other information in the BCA Proxy Statement remains unchanged.
As provided in the BCA Proxy
Statement, the Company is soliciting stockholder approval of, among other things, its proposed business combination (the Business Combination ) and the other matters as described in the BCA Proxy Statement and a
prospectus relating to the offer of the securities to be issued to the stockholders of QT Imaging in connection with the Business Combination. The purpose of the following supplemental disclosures is to provide information about the new deadline for
submission of written requests to exercise redemption rights in connection with the vote on the Business Combination and the other matters described in the BCA Proxy Statement. Terms used herein, unless otherwise defined, have the meanings set forth
in the BCA Proxy Statement.
DESCRIPTION OF SUPPLEMENT
As previously disclosed in the BCA Proxy Statement, the deadline to submit written requests to exercise the redemption rights in connection with the vote on
the Business Combination and the other matters described in the BCA Proxy Statement, expired at 5:00 pm Eastern time on February 15, 2024, two business days prior to the Stockholders Meeting. Due to procedural error at Continental Stock
Transfer & Trust Company ( Continental ), Continental failed to collect written requests to exercise the redemption rights in connection with the vote at the annual Stockholders Meeting prior to the deadline.
Despite that and although the Company is under no obligation to do so, it is willing to give the public stockholders of the Company the opportunity to redeem
their shares of common stock of the Company and as such, GigCapital5 extends the deadline to submit written requests to exercise the redemption rights to 5:00 pm Eastern time, on February 16, 2024.
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.
On December 8, 2022, GigCapital5 entered into the BCA with Merger Sub and QT Imaging,
pursuant to the terms of which, 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 ).
Additional Information and Where to Find It
connection with the proposed Business Combination, GigCapital5 filed with the SEC a registration statement on Form S-4 (together with all amendment to such registration statement, the
Registration Statement ), which includes a preliminary proxy statement/prospectus (the BCA Proxy Statement ) to be distributed to holders of GigCapital5 Common Stock in connection with GigCapital5 s
solicitation of proxies for the vote by GigCapital5 s stockholders with respect to the Business Combination and the other matters as described in the Registration Statement and a prospectus relating to the offer of the securities to be issued
to the stockholders of QT Imaging in connection with the Business Combination. After the Registration Statement has been filed and declared effective, GigCapital will mail a definitive BCA Proxy Statement, when available, to its stockholders.
Investors and security holders and other interested parties are urged to read the BCA Proxy Statement, any amendments thereto and any other documents filed with the SEC carefully and in their entirety when they become available because they will
contain important information about GigCapital5, QT Imaging and the proposed Business Combination. Such persons can also read GigCapital5 s Annual Report on Form 10-K and Current
Reports on Form 8-K for more information on the security holdings of its officers and directors and their respective interests as security holders in the consummation of the Transactions
described in this Current Report. The BCA Proxy Statement, Registration Statement, and GigCapital5 s other reports can be obtained, without charge, at the SEC s web site (www.sec.gov) and on GigCapital5 s website
Participants in the Solicitation
GigCapital5, QT Imaging, 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 approval of 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, 2022, which was filed with the SEC on June 15,
2023. 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 approval of the proposed Business Combination is set forth in the BCA
Proxy Statement for the proposed Business Combination.. GigCapital5 stockholders, potential investors and other interested persons should read the BCA Proxy Statement carefully before making any voting or investment decisions.
Forward-Looking Statements:
This Current Report 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 the businesses of GigCapital5 and QT Imaging
may differ from their actual results and consequently, you should not rely on these forward-looking statements as predictions of future events. 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, expectations of the management of QT Imaging with respect to the business and prospects of QT Imaging and
the QTscan and other products of QT Imaging, the benefits of the proposed Business Combination, the plans, expectations and intentions of QT Imaging and GigCapital5, the satisfaction of
the closing conditions to the proposed Business Combination, the timing of the completion of the proposed Business Combination and the future performance of QT Imaging, including the anticipated impact of the proposed Business Combination on this
performance, the completion of the financing with Yorkville or the ability to raise any other financing in connection with the Business Combination. 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 QT Imaging and are difficult to predict. Factors that may cause such differences include, but are not limited to:
(1) the ability of GigCapital5, QT Imaging and QTI Holdings to issue equity or equity-linked securities in connection with the proposed Business Combination or in the future, (2) the outcome of any legal proceedings that may be instituted
against the parties following the announcement of the proposed Business Combination and the BCA; (3) the inability to complete the proposed Business Combination, including the risk that any regulatory approvals or the SEC s declaration of
the effectiveness of the BCA Proxy Statement are not obtained, are delayed or are subject to unanticipated conditions that could adversely affect QTI Holdings or the expected benefits of the proposed Business Combination or due to failure to obtain
approval of the stockholders of GigCapital5 and QT Imaging or other conditions to closing; (4) the amount of redemption requests made by GigCapital5 s stockholders; (5) the impact
of the COVID-19 pandemic on (x) the parties ability to consummate the proposed Business Combination and (y) the business of QT Imaging and QTI Holdings; (6) the receipt
of an unsolicited offer from another party for an alternative business transaction that could interfere with the proposed Business Combination; (7) the inability to obtain or maintain the listing of QTI Holdings common stock on the Nasdaq
Stock Exchange or any other Exchange following the proposed Business Combination; (8) 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; (9) the ability to recognize the anticipated benefits of the proposed Business Combination, which may be affected by, among other things, competition, the ability of QTI Holdings to grow and manage growth profitably and
retain its key employees; (10) costs related to the proposed Business Combination; (11) changes in applicable laws or regulations; (12) the demand for QT Imaging s and QTI Holdings services together with the possibility
that QT Imaging or QTI Holdings may be adversely affected by other economic, business, and/or competitive factors; (13) risks and uncertainties related to QT Imaging s business, including, but not limited to, the ability of QT Imaging to
increase sales of its output products in accordance with its plan; (14) risks related to the rollout of QT Imaging s business and the timing of expected business milestones; (15) the effects of competition on QT Imaging s
business; (16) changes in domestic and foreign business, market, financial, political, and legal conditions; (17) the inability to close on the Yorkville financing or obtain any other financing to support the closing of the Business
Combination and cover operating needs of QTI Holdings, and (18) 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. You should not place undue reliance upon any forward-looking statements, which speak only as of the date made. GigCapital5 and QT Imaging do not undertake or accept any
obligation or undertaking to release publicly any updates or revisions to any forward-looking statements to reflect any change in their expectations or any change in events, conditions, or circumstances on which any such statement is based.
Last updated: Feb 16, 2024