Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 415

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 415
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mination Agreement                        |     |                      |         | -202,000 |
| Change in fair value                                             |     |                      |         | -101,300 |
| Ending balance, March 31, 2025, June 30, 2025 and September 2025 |     | $                    |       — |          |

The extinguishment of the derivative liability of $0 and $202,000 was recorded in other income (expense), net within the condensed consolidated statements of operations and comprehensive loss during the three and nine months ended September 30, 2025, respectively.

#### 4.

#### Inventory
Inventory consisted of the following as of September 30, 2025 and December 31, 2024:

|                 |     |   | September 30, 2025 |     |   | December 31, 2024 |
|:----------------|:----|:--|-------------------:|:----|:--|------------------:|
| Raw materials   |     | $ |          4,488,530 |     | $ |         2,551,947 |
| Work in process |     |   |            731,912 |     |   |           278,869 |
| Finished goods  |     |   |             21,786 |     |   |           309,903 |
| Total           |     | $ |          5,242,228 |     | $ |         3,140,719 |

#### 5.

#### Property and Equipment, Net
Property and equipment, net consisted of the following as of September 30, 2025 and December 31, 2024:

|                                |     |           | Useful Life |   | September 30, 2025 |     |   | December 31, 2024 |
|:-------------------------------|:----|:----------|:------------|:--|-------------------:|:----|:--|------------------:|
| Scanners                       |     | 5 Years   |             | $ |          1,904,491 |     | $ |         1,904,491 |
| Computer and lab equipment     |     | 3-5 Years |             |   |          1,471,331 |     |   |         1,424,513 |
| Leasehold improvements         |     | Various   |             |   |            421,266 |     |   |           421,