Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 349

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 349
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. The values of the failure to timely convert and corporate event features were deemed to be de minimis.

Significant assumptions used in the valuation of the fair value of the derivative liability as of issuance on March 4, 2024 and as of December 31, 2024 were as follows:

|                            |     |   | March 4, 2024 |      |     |   | December 31, 2024 |      |
|:---------------------------|:----|:--|--------------:|-----:|:----|:--|------------------:|-----:|
| Fair value of common stock |     | $ |         10.59 |      |     | $ |              1.47 |      |
| Term in years              |     |   |               | 1.25 |     |   |                   | 1.26 |
| Volatility                 |     |   |         130.0 |    % |     |   |             120.0 |    % |
| Risk-free rate             |     |   |           4.9 |    % |     |   |               4.2 |    % |
| Debt discount              |     |   |          30.0 |    % |     |   |              30.0 |    % |

The activity for the fair value of the derivative liability during the year ended December 31, 2024 was as follows:

| Beginning balance, January 1, 2024 |     | Derivative Liability |          — |
|:-----------------------------------|:----|:---------------------|-----------:|
| Fair value at issuance             |     |                      |  5,120,900 |
| Change in fair value               |     |                      | -4,817,600 |
| Ending balance, December 31, 2024  |     | $                    |    303,300 |

#### 4. Inventory
Inventory consisted of the following as of December 31, 2024 and 2023:

|                 |     |   | December 31, 2024 |     |   | December 31, 2023 |
|:----------------|:----|:--|------------------:|:----|:--|------------------:|
| Raw materials   |     | $ |         2,551,947 |     | $ |         2,529,364 |
| Work in process |     |   |