Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 0

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 0
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#### Filed pursuant to Rule 424(b)(3)

#### Registration No. 333-291237

#### PROSPECTUS

#### QT IMAGING HOLDINGS, INC.

#### 29,336,017 Shares of Common Stock
This prospectus relates solely to the offer and sale from time to time of up to an aggregate 29,336,017 shares of the common stock, par value $0.0001 per shares (the “

#### Common Stock
”), of QT Imaging Holdings, Inc. (the “

#### Company
,” “

#### we
,” “

#### our
” or “

#### us
”) by the selling securityholders identified in this prospectus (the “

#### Selling Securityholders
”). Such shares consist of (i) 2,562,334 shares of Common Stock that have been issued to the Selling Securityholders (the “

#### Common Shares
”), (ii) 24,442,342 shares of Common Stock that are issuable upon the exercise of the Five Year Common Warrants (as defined below) acquired by certain of the Purchasers (as defined below) and Lynrock Lake Master Fund LP (“

#### Lynrock Lake
”), (iii) 523,286 shares of Common Stock that are issuable upon the exercise of the Common Stock purchase warrants with a term of ten years from the initial exercise date (the “

#### Ten Year Common Warrants
”) acquired by certain of the Purchasers and (iv) 1,808,055 shares of Common Stock that are issuable upon the exercise of the pre-funded warrants (the “

#### Pre-Funded Warrants
”, and together with the Five Year Common Warrants and the Ten Year Common Warrants, the “

#### Warrants
”) acquired by certain of the Purchasers and exercisable any time after its issuance. The shares of Common Stock issuable upon the exercise of the Warrants are referred to as the “

#### Warrant Shares
.”

On August 19, 2025, the Company held its 2025 Annual Meeting of Stockholders (the “

#### Annual Meeting
”). At the Annual Meeting, the Company’s stockholders approved an amendment to the Company’s Second Amended and Restated Certificate of Incorporation (the “

#### Certificate of Amendment
”) to effect a reverse split of the outstanding shares of the Common Stock at a specific ratio within a range of 2:1 to 20:1, with the specific ratio to be fixed within this