Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 25

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 25
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 Third Securities Purchase Agreement, dated September 30, 2025, by and between the Company and the Third Purchasers. Pursuant to the Third Securities Purchase Agreement, the Company entered into a Third Registration Rights Agreement with the Third Purchasers, dated Septe mber 30, 2025. The aggregate gross proceeds to the Company from the Third Private Placement were approximately $18,180,655, b efore deducting the placement agent fees and other offering expenses payable by the Company.

#### Corporate Information
GigCapital5, our predecessor company, was incorporated in the State of Delaware in January 2021 for the purpose of effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or similar business combination involving GigCapital5 and one or more businesses. GigCapital5 completed its initial public offering in September 2021.

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We have two wholly owned operating subsidiaries: QT Imaging, Inc. and QT Ultrasound Labs, Inc. QT Imaging was initially incorporated under the laws of the State of Delaware 2012. In March 2024, Merger Sub merged with and into QT Imaging, and QT Imaging as the Surviving Corporation became a wholly-owned direct subsidiary of GigCapital5. In connection with the Merger, GigCapital5 changed its name to QT Imaging Holdings, Inc. The corporate office of QT Imaging Holdings, Inc. is located at 3 Hamilton Landing, Suite 160, Novato, CA 94949 and its telephone number is (415) 842-7250.

Implications of Being an Emerging Growth Company and a Smaller Reporting Company

We are an emerging growth company as defined in the Jumpstart Our Business Startups Act of 2012 (the “

#### Jobs Act
”). We will remain an emerging growth company under the JOBS Act until the earliest of (i) the last day of our first fiscal year (a) following the fifth anniversary of GigCapital5’s IPO (September 28, 2026), (b) in which we have total annual gross revenue of at least $1.235 billion, or (c) in which we are deemed to be a “large accelerated filer” under the rules of the SEC with at least $700.0 million of outstanding securities held by non-affiliates; and (ii) the date on which we have issued more than $1.00 billion in non-convertible debt securities during the prior three-year period.

We are also a “