Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 352

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 352
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             |     |   |           337,409 |     |   |           205,171 |
| Total             |     | $ |           516,552 |     | $ |           214,979 |

Accrued expenses and other current liabilities consisted of the following as of December 31, 2024 and 2023:

<div align='center'>F-27</div>

#### QT IMAGING HOLDINGS, INC.

### Notes to Consolidated Financial Statements
|                         |     |   | December 31, 2024 |     |   | December 31, 2023 |
|:------------------------|:----|:--|------------------:|:----|:--|------------------:|
| Accrued legal           |     | $ |         1,867,107 |     | $ |            24,729 |
| Accrued personnel costs |     |   |           963,865 |     |   |           120,856 |
| Accrued excise taxes    |     |   |           207,358 |     |   |                 — |
| Accrued advisory fee    |     |   |           100,000 |     |   |                 — |
| Other                   |     |   |           411,624 |     |   |           224,066 |
| Total                   |     | $ |         3,549,954 |     | $ |           369,651 |

#### 8. Long-Term Debt

#### Paycheck Protection Program Loan
On February 24, 2021 and May 5, 2020, the Company received loans (“PPP Loans”) from US Bank in the amounts of $1,158,265 (“Loan 2”) and $1,158,266 (“Loan 1”), respectively, to fund payroll, rent and utilities through the Paycheck Protection Program (“PPP”). Original loan terms were revised by the PPP Flexibility Act of 2020. Under the terms of the PPP, up to 100% of the loan and related interest was forgivable if the proceeds were used for covered expenses and certain other requirements related to wage rates were met. For Loan 1, the Company applied for forgiveness on June 7, 2021, and received forgiveness of $873,151 in principal and $9,823 in interest from the Small Business Administration (“SBA”) on June 14, 2021. For Loan 2