Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 3

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 3
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 conditions of the Securities Purchase Agreement, dated September 30, 2025 (the “

#### Third Securities Purchase Agreement
”), by and between the Company and certain accredited investors and qualified institutional buyers, led by Sio Capital Management, LLC, (the “

#### Third Purchasers
”, and together with the First Purchasers and Second Purchaser, the “

#### Purchasers
”), pursuant to which the Third Purchasers purchased in the aggregate and the Company issued using amounts from prior to the implementation of the Reverse Stock Split (i) 6,696,715 Common Shares (and following the Reverse Stock Split, 2,232,243 Common Shares), (ii) Subscription Warrants (the “

#### Subscription Warrants
”, and together the Lynrock Lake Warrant and the Recanati Warrant, the “

#### Five Year Common Warrants
”) with a term of five years from the initial exercise date to purchase up to an additional 12,120,798 shares of Common Stock, which since the Effective Time, the number of shares to be issued upon exercise of the Subscription Warrants have been adjusted to 4,040,272, and (iii) up to 5,424,083 Pre‑Funded Warrants to purchase up to an additional 5,424,083 shares of Common Stock, which since the Effective Time, the number of shares to be issued upon exercise of the Pre-Funded Warrants have been adjusted to 1,808,055. Pursuant to the Third Securities Purchase Agreement, the Company entered into a Registration Rights Agreement with the Third Purchasers, dated September 30, 2025 (the “

#### Third Registration Rights Agreement
”, and together with the First Registration Rights Agreement and Second Registration Rights Agreement, the “

#### Registration Rights Agreements
”). The aggregate gross proceeds to the Company from the Third Private Placement were approximately $18,180,655, before deducting the placement agent fees and other offering expenses payable by the Company. See the section entitled “ Private Placement of Shares of Common Stock and Warrants .”

The Company is registering the Common Shares and Warrant Shares for resale pursuant to the Registration Rights Agreements and the Warrant Agreement. The Company will not receive any of the proceeds from the sale of these shares of Common Stock by the Selling Securityholders. However, the Company will receive proceeds from the exercise of the Warrants, if the Warrants are exercised for cash. The Company intends to use those proceeds, if any, for general corporate