Company: QTIWW
Filing Date: 2025-12-29
Form Type: S-1/A
Source: 0001628280-25-058960
Chunk: 407

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-29
Form: S-1/A
Chunk 407
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 transactions outside the company’s control. Consequently, upon modification, the warrants were revalued and then reclassified to additional paid-in capital on the condensed consolidated balance sh eets. The Co mpany determined the fair value of the Yorkville Warrant using the Black-Scholes Model.

Significant assumptions used in the valuation of the fair value of the Yorkville Warrant as of issuance on February 26, 2025 and as of modification on June 11, 2025 were as follows:

<div align='center'>F-63</div>

#### QT IMAGING HOLDINGS, INC.

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

|                                |     |   | February 26, 2025 |   |     |   | June 11, 2025 |   |
|:-------------------------------|:----|:--|------------------:|:--|:----|:--|--------------:|:--|
| Fair value of common stock     |     | $ |              1.20 |   |     | $ |          1.50 |   |
| Exercise price                 |     | $ |              1.20 |   |     | $ |          1.20 |   |
| Expected warrant term (years)  |     |   |               5.0 |   |     |   |           4.7 |   |
| Expected volatility            |     |   |              51.6 | % |     |   |          39.2 | % |
| Risk-free rate of return       |     |   |               4.1 | % |     |   |           4.0 | % |
| Expected annual dividend yield |     |   |                 — | % |     |   |             — | % |

The activity for the fair value of the Yorkville Warrant during the three and nine months ended September 30, 2025 were as follows:

| Beginning balance, January 1, 2025                              |     | Yorkville Warrant |          — |           |
|:----------------------------------------------------------------|:----|:------------------|-----------:|----------:|
| Fair value at issuance                                          |     |                   |            | 2,992,522 |
| Change in fair value                                            |     |                   |    111,795 |           |
| Ending balance, March 31, 2025                                  |     |                   |