Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 388

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 388
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 hand, for the October 2025 Private Placement. At the closing of the October 2025 Private Placement on October 3, 2025, the Company issued (i) 2,232,243 shares of the Company’s common stock, par value $0.0001 per share; (ii) the Subscription Warrants with a term of five years from the initial exercise date to purchase up to an additional 4,040,272 shares of common stock; and (iii) 5,424,083 Pre-Funded Warrants to purchase up to an additional 1,808,055 shares of common stock, exercisable any time after its issuance. The purchase price of each common share is $4.50 and the purchase price for each Pre-Funded Warrant is $4.4997. Both of these amounts were paid by the Purchasers at the closing of the October 2025 Private Placement. The aggregate gross proceeds to the Company from the October 2025 Private Placement was approximately $18,180,655, before deducting the offering expenses payable by the Company, which expenses consist solely of legal fees and the amounts provided for pursuant to a placement agency agreement In addition, The per share exercise price of each Subscription Warrant is $4.50 and the per share exercise price of each Pre-Funded Warrant is $0.0003.

On October 6, 2025, the Company repaid the Tranche B loan in the amount of $5.0 million, plus accrued interest and a 6% premium.

<div align='center'>F-47</div>

#### QT Imaging Holdings, Inc.

### Unaudited Condensed Consolidated Financial Statements
<div align='center'>As of September 30, 2025 and December 31, 2024 and for the Three and Nine Months Ended September 30, 2025 and 2024

F-48</div>

#### QT IMAGING HOLDINGS, INC.

#### Condensed Consolidated Balance Sheets

#### As of September 30, 2025 and December 31, 2024
<div align='center'>(Unaudited)</div>

|                                                                                                                                                                                                                                      |     |   | September 30, 2025 |     |   | December 31, 2024 |
|:-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:----|:--|-------------------:|:----|:--|------------------:|
| ASSETS                                                                                                                                                                                                                               |     |   |                    |