Company: QTIWW
Filing Date: 2025-02-05
Form Type: 424B3
Source: 0001628280-25-004061
Chunk: 351

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-02-05
Form: 424B3
Chunk 351
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 Amendment and issuance of the senior secured convertible promissory note to US Capital as part of the Bridge Loan (the “US Capital Note”), the outstanding loan balances of the Note of $2,495,000 with accrued interest of $635,854 was considered extinguished. The Company recorded $376,086 as a loss on extinguishment in other expenses in the consolidated statements of operations and comprehensive loss, and includes a commission paid of $20,000, remaining unamortized debt issuance costs on the Note of $32,828 and the fair value of warrants to purchase 60,329 shares of common stock of $156,505.

As of December 31, 2023, the total Note and US Capital Note balance was $3,294,659 net of unamortized debt issuance costs of $36,194, and accrued interest of $50,037. As of December 31, 2022, the outstanding amount of the Note was $2,426,263, net of unamortized debt issuance costs of $68,737. Interest expense, including amortization of debt issuance costs, for the years ended December 31, 2023 and 2022 was $340,758 and $326,255, respectively.

#### Bridge Loan
In November 2023, the Company entered into a Bridge Loan with the Bridge Lenders in aggregate amount of $1,000,000.

Each Bridge Loan of $200,000 bears no interest but has a cash option value at the date maturity of 120% or $240,000 of the Bridge Loan at each Bridge Lender’s option. Maturity date is the closing date of the Business Combination as defined in Note 1. The Bridge Loan conversion is at $2.00 per share on a post-business combination and, as of December 31, 2023, an aggregate of 1,369,255 shares of common stock would be issued if the entire Bridge Loan was converted.

<div align='center'>F-17</div>

#### QT IMAGING, INC.

### NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
<div align='center'>For the years ended December 31, 2023 and 2022</div>

As of December 31, 2023, the outstanding amount of the Bridge Loan, excluding the US Capital Note, was $774,337, net of unamortized debt issuance costs of $25,663. Interest expense from the amortization of debt issuance costs for