Company: QTIWW
Filing Date: 2025-01-16
Form Type: S-1
Source: 0001628280-25-001723
Chunk: 382

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-01-16
Form: S-1
Chunk 382
---
, 2024 |      |     |   | September 30, 2024 |      |
|:---------------------------|:----|:--|--------------:|-----:|:----|:--|-------------------:|-----:|
| Fair value of common stock |     | $ |          3.53 |      |     | $ |               0.71 |      |
| Term in years              |     |   |               | 1.25 |     |   |                    | 1.23 |
| Volatility                 |     |   |         130.0 |    % |     |   |              115.0 |    % |
| Risk-free rate             |     |   |           4.9 |    % |     |   |                3.9 |    % |
| Debt discount              |     |   |          30.0 |    % |     |   |               30.0 |    % |

<div align='center'>F-49</div>

#### QT IMAGING HOLDINGS, INC.

### Notes to Condensed Consolidated Financial Statements
<div align='center'>(Unaudited)</div>

The activity for the fair value of the derivative liability during the three and nine months ended September 30, 2024 was as follows:

| Beginning balance, January 1, 2024 |     | Derivative Liability |          — |
|:-----------------------------------|:----|:---------------------|-----------:|
| Fair value at issuance             |     |                      |  5,120,900 |
| Change in fair value               |     |                      | -2,983,100 |
| Ending balance, March 31, 2024     |     |                      |  2,137,800 |
| Change in fair value               |     |                      | -1,729,700 |
| Ending balance, June 30, 2024      |     |                      |    408,100 |
| Change in fair value               |     |                      |    -87,200 |
| Ending balance, September 30, 2024 |     | $                    |    320,900 |

#### 4.

#### Inventory
Inventory consisted of the following as of September 30, 2024 and December 31, 2023:

|                 |     |   | September 30, 2024 |     |   | December 31, 2023 |
|: