Company: QTIWW
Filing Date: 2025-11-03
Form Type: S-1
Source: 0001628280-25-048373
Chunk: 432

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-11-03
Form: S-1
Chunk 432
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 reconstituted into one share of common stock effective October 23, 2025.

Options to purchase 522,000shares of common stock were granted during the three and six months ended June 30, 2025 at a weighted-average fair value of $ 1.28per share. Nooptions were granted during the three and six months ended June 30, 2024.

The determination of the fair value of options granted during the three and six months ended June 30, 2025 is computed using the Black-Scholes option pricing model with the following weighted-average assumptions:

| Stock price per share          |     | $ | 2.01 |     |
| Expected option term (years)   |     |   |      | 5.5 |
| Expected volatility            |     |   | 71.2 |   % |
| Risk-free rate of return       |     |   |  4.0 |   % |
| Expected annual dividend yield |     |   |    — |   % |

Option pricing models require the input of various subjective assumptions, including the option’s expected 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

<div align='center'>F-77</div>

#### QT IMAGING HOLDINGS, INC.

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

on the U.S. Treasury interest rates whose term in consistent with the expected life of the stock options. No dividend 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 six months ended June 30, 2025 and 2024:

|                                     |     | Three Months Ended 
 June 30,           
 2025               |         |     | 2024 |   |     | Six Months Ended 
 June 30,         
 2025             |         |