Company: QTIWW
Filing Date: 2025-12-29
Form Type: S-1/A
Source: 0001628280-25-058960
Chunk: 438

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-29
Form: S-1/A
Chunk 438
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 life and the price volatility of the underlying stock. The expected stock price volatility is based on the analysis of volatilities of the Company’s selected public peer group over a period commensurate with the expected term of the options. The expected term of employee options represents the weighted-average period the options are expected to remain outstanding and was derived using the simplified method for awards that qualify for its “plain-vanilla” options. All awards that are outstanding are qualified for “plain-vanilla” options. The risk-free interest rate is based on the U.S. Treasury interest rates whose term in consistent with the expected life of the stock options. No dividend

<div align='center'>F-78</div>

#### QT IMAGING HOLDINGS, INC.

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

yield is included as the Company has not issued any dividends and do not anticipate issuing any dividends in the future.

The following table shows stock-based compensation expense by functional area in the condensed consolidated statements of operations and comprehensive loss for the three and nine months ended September 30, 2025 and 2024:

|                                     |     | 2025 | Three Months Ended 
      September 30, |     | 2024 |         |     | 2025 | Nine Months Ended 
     September 30, |     | 2024 |         |
|:------------------------------------|:----|:-----|-------------------:|:----|:-----|--------:|:----|:-----|------------------:|:----|:-----|--------:|
| Research and development            |     | $    |             25,616 |     | $    |  22,248 |     | $    |            53,912 |     | $    |  36,198 |
| Selling, general and administrative |     |      |            173,179 |     |      | 104,955 |     |      |           464,809 |     |      | 129,989 |
|                                     |     | $    |            198,795 |     | $    | 127,203 |     | $    |           518,721 |     | $    | 166,187 |

Stock-based compensation expense capitalized to inventory for three and nine months ended September 30, 2025 and 2024 was insignificant.

As of September 30, 2025, the total unrecognized compensation cost