Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 263

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 263
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 Second Non-Convertible Working Capital Note was issued to provide the Company with additional working capital and was not deposited into the Trust Account. The Company issued the Second Non-Convertible Working Capital Note in consideration for an additional loan from GigAcquisitions5 to fund the Company’s working capital requirements.

#### Extension Note
On August 28, 2023, GigCapital5 issued that certain non-convertible Eleventh Amended and Restated Promissory Note (as amended, the “

#### Extension Note
”) to GigAcquisitions5 for an aggregate principal amount of $1,560,000. On March 4, 2024, the Company and GigAcquisitions5 agreed to amend and restate the Extension Note to extend the date of maturity until March 4, 2025.

#### QT Imaging Related Agreements

#### QTI Working Capital Note
In July 2020, QT Imaging, Inc. issued a convertible promissory note to Dr. John Klock that was amended on September 1, 2022 and November 14, 2022 (the “

#### 2022 Klock Note
”), for a principal amount of $2,643,725. In addition, on May 3, 2023, QT Imaging, Inc. issued a promissory note (the “

#### QTI Working Capital Note
”) to Dr. Klock for a principal amount of $250,000. The QTI Working Capital Note was subsequently amended and restated five times on June 12, 2023 to add an additional principal amount of $100,000, August 15, 2023 to add an additional principal amount of $75,000, August 29, 2023 to add an additional principal amount of $100,000, September 12, 2023 to add an additional principal amount of $75,000, and September 15, 2023 to add an additional principal amount of $50,000, for an aggregate principal amount outstanding as of September 30, 2023 under the QTI Working Capital Note of $650,000. The QTI Working Capital Note was issued to provide the Company with additional working capital during the period prior to consummation of the business combination agreement with GigCapital5, Inc. The QTI Working Capital Note is interest-free and matures on the earlier of (i) the date on which the Company consummates the business combination with GigCapital5, Inc.; (ii) the date the Company winds