Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 408

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 408
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 Hedging: Contracts in an Entities Own Equity , equity classification is permitted for an instrument that requires net-cash settlement if the holders of the contract’s underlying shares receive the same form of consideration in transactions outside the company’s control. Consequently, upon modification, the warrants were revalued and then reclassified to additional paid-in capital on

<div align='center'>F-62</div>

#### QT IMAGING HOLDINGS, INC.

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

the condensed consolidated balance sh eets. The Company determined the fair value of the Lynrock Lake Warrant using the Black-Scholes pricing model.

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

|                                |     |   | 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)  |     |   |              10.0 |   |     |   |           9.7 |   |
| Expected volatility            |     |   |              51.6 | % |     |   |          39.2 | % |
| Risk-free rate of return       |     |   |               4.3 | % |     |   |           4.4 | % |
| Expected annual dividend yield |     |   |                 — | % |     |   |             — | % |

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

| Beginning balance, January 1, 2025                              |     | Lynrock Lake Warrant |           — |            |
|:----------------------------------------------------------------|:----|:---------------------|------------:|-----------:|
| Fair value at issuance                                          |     |                      |             |