Company: QTIWW
Filing Date: 2025-02-05
Form Type: 424B3
Source: 0001628280-25-004061
Chunk: 4

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-02-05
Form: 424B3
Chunk 4
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 or update or change information contained in, this prospectus. You should read both this prospectus and any applicable prospectus supplement or post-effective amendment to the registration statement together with the additional information to which we refer you in the sections of this prospectus entitled “Where You Can Find More Information.”

Prior to March 4, 2024, we were known as GigCapital5, Inc., a Delaware corporation (“

#### GigCapital5
”), and QTI Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of GigCapital5 (“

#### Merger Sub
”). On December 8, 2022, we entered into a Business Combination Agreement, as amended, (the “

#### Business Combination Agreement
”) with QT Imaging, Inc., a Delaware corporation (“

#### QT Imaging
”), pursuant to which on March 4, 2024, Merger Sub merged with and into QT Imaging, with QT Imaging surviving the merger as a wholly owned subsidiary of GigCapital5 (the “

#### Merger
” and, together with the other transactions contemplated by the Business Combination Agreement and any other agreement executed and delivered in connection therewith, the “

#### Business Combination
”). Following the closing of the Business Combination (the “

#### Closing
”), GigCapital5 renamed as “QT Imaging Holdings, Inc.” will be referred to as the “

#### Company
” or “

#### QT Imaging Holdings
.” Unless the context indicates otherwise, references in this prospectus to the “Company,” “QT Imaging Holdings,” “we,” “us,” “our” and similar terms refer to QT Imaging Holdings, Inc. (f/k/a GigCapital5, Inc.). References to “GigCapital5” refer to our predecessor company prior to the consummation of the Business Combination.

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#### Table of Contents

### CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS
The Company makes forward-looking statements in this prospectus and in documents incorporated herein by reference. All statements, other than statements of present or historical fact included in or incorporated by reference in this prospectus, regarding the Company’s future financial performance, as well as the Company’s strategy, future operations, financial position, estimated revenues, and losses, projected costs, prospects, plans and objectives of management are forward-looking statements. When used in this prospectus, the words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intends,” “