Company: QTIWW
Filing Date: 2025-12-29
Form Type: S-1/A
Source: 0001628280-25-058960
Chunk: 428

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-29
Form: S-1/A
Chunk 428
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272,879, net of the unamortized debt discount of $ 9,827,121, and accrued interest of $ 670,193. Interest expense, including amortization of debt issuance costs, for the three and nine months ended September 30, 2025 was $ 521,243and $ 943,073, respectively.

Future principal payments on the long-term debt as of September 30, 2025 are as follows:

| Year ending December 31:                   
 2025 (remaining)                           |     |   |  5,013,769 |
|:-------------------------------------------|:----|:--|-----------:|
| 2026                                       |     |   |      9,197 |
| 2027                                       |     |   | 10,100,000 |
| Total payments                             |     |   | 15,122,966 |
| Less: Unamortized debt issuance costs      |     |   | -9,827,121 |
| Less: Current maturities of long-term debt |     |   | -5,022,966 |
| Long-term debt                             |     | $ |    272,879 |

#### 8.

#### Leases
The Company leases its operating facilities in Novato, California, under a non-cancelable operating lease through May 31, 2027. There are no options or rights to extend the term of this lease.

<div align='center'>F-73</div>

#### QT IMAGING HOLDINGS, INC.

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

The following table reflects the Company’s right-of-use (“ROU”) assets and lease liabilities as of September 30, 2025 and December 31, 2024:

|                                      |     |   | September 30, 2025 |     |   | December 31, 2024 |
|:-------------------------------------|:----|:--|-------------------:|:----|:--|------------------:|
| Assets:                              |     |   |                    |     |   |                   |
| Operating lease ROU assets, net      |     | $ |            666,529 |     | $ |           935,246 |
| Liabilities:                         |     |   |                    |     |   |                   |
| Operating lease liabilities, current |     | $ |            441,634 |     | $ |