Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 276

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 276
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 sell or otherwise transfer all, some or none of such

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shares in this offering. See the section entitled “Plan of Distribution” for further information regarding the Selling Securityholders’s method of distributing these shares.

|                                               |     | Shares Beneficially Owned Prior to the Offering |           |     |        |     |   |     | Shares Being Offered |            |     |        |     | Shares Beneficially Owned After the Offering |         |     |   |     |   |     |   |
| Name of Selling Stockholder                   |     | Shares                                          |           |     | % (18) |     |   |     |                      |            |     | Shares |     |                                              |         |     | % |     |   |     |   |
| Dr. Avi S. Katz (1)                           |     |                                                 |   927,913 |     |        | 7.5 | % |     |                      |    392,465 |     |        |     |                                              | 535,448 |     |   |     |   | 4.4 | % |
| Dr. Raluca Dinu (1)                           |     |                                                 | 1,058,468 |     |        | 8.4 | % |     |                      |    392,465 |     |        |     |                                              | 666,003 |     |   |     |   | 5.6 | % |
| Leon Recanati (2)                             |     |                                                 |   136,894 |     |        | 1.1 | % |     |                      |    136,894 |     |        |     |                                              |       — |     |   |     |   |   — |   |
| Sio Partners LP (3)                           |     |                                                 |   613,294 |     |        | 4.9 | % |     |                      |  1,084,676 |     |        |     |                                              |       — |     |   |     |   |   — |   |
| Sio Partners Offshore LTD. (3)                |     |                                                 |         — |     |        |   — | % |     |                      |    698,005 |     |        |     |                                              |       — |     |   |     |   |   — |   |
| Compass SAV II