Company: QTIWW
Filing Date: 2025-02-05
Form Type: 424B3
Source: 0001628280-25-004061
Chunk: 385

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-02-05
Form: 424B3
Chunk 385
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 volatility and risk-free interest rates. Forfeitures are recorded as they occur.

#### Comprehensive Loss
Comprehensive loss is defined as the change in the equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. Comprehensive loss was equal to net loss for three and nine months ended September 30, 2024 and 2023.

#### Net Loss per Share
Basic net loss per share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss attributable to common stockholders by the weighted-average number of common shares and potentially dilutive common share equivalents outstanding for the period determined using the treasury-stock and if-converted methods. For the purposes of the diluted net loss per share calculation, common stock equivalents are considered to be potentially dilutive securities.

<div align='center'>F-40</div>

#### QT IMAGING HOLDINGS, INC.

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

Reconciliation of net loss per share for the three and nine months ended September 30, 2024 and 2023 is as follows:

|                                                                                          |     | 2024 | Three Months Ended 
      September 30, |     | 2023 |            |     | 2024 | Nine Months Ended 
     September 30, |     | 2023 |            |
|:-----------------------------------------------------------------------------------------|:----|:-----|-------------------:|:----|:-----|-----------:|:----|:-----|------------------:|:----|:-----|-----------:|
| Net loss attributable to QT Imaging Holdings, Inc.                                       |     | $    |         -3,619,494 |     | $    | -1,375,939 |     | $    |        -9,166,958 |     | $    | -4,588,900 |
| Deemed dividend related to the modification of equity classified warrants                |     |      |                  — |     |      |          — |     |      |        -5,185,502 |     |      |          — |
| Net loss attributable to common stockholders                                             |     | $    |         -3,619,494 |     | $    | -1,375,939 |     | $    |       -14,352