Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 439

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 439
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         |     | $              | 2.44 |     |                  |     | 9.3 |

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(1) Share amounts as of January 1, 2025 differ from those published in prior condensed consolidated financial statements as they were retrospectively adjusted as a result of the Reverse Stock Split (as described in Note 1, The Company and Summary of Significant Accounting Policies). Specifically, the number of share of common stock outstanding during periods before the Reverse Stock Split are divided by the exchange ratio of 3:1, such that each three shares of common stock were combined and reconstituted into one share of common stock effective October 23, 2025.

(2) The options outstanding as of December 31, 2024 were revised by 88,000 from the amount previously reported on the Annual Report on Form 10-K for the year ended December 31, 2024. The effect on stock-based compensation was immaterial.

Options to purchase 67,333 shares of common stock were granted during the three months ended September 30, 2025 at a weighted-average fair value of $3.71 per share. Options to purchase 589,333 shares of common stock were granted during the nine months ended September 30, 2025 at a weighted-average fair value of $1.55 per share. Options to purchase 690,645 shares of common stock were granted during the three and nine months ended September 30, 2024 at a weighted-average fair value of $1.42 per share. The determination of the fair value of options granted during the three and nine months ended September 30, 2025 and 2024 was computed using the Black-Scholes option pricing model with the following weighted-average assumptions:

|                                |     | 2025 | Three Months Ended 
      September 30, |     |     | 2024 |      |     |     | 2025 | Nine Months Ended 
     September 30, |     |     | 2024 |      |     |
|:-------------------------------|:----|:-----|-------------------:|----:|:----|:-----|-----:|----:|:----|:-----|------------------:|----:|:----|:-----|-----:|----:|
| Stock price per share          |     | $    |               5.64 |     |     | $    | 2.22 |     |     | $    |