Company: QTIWW
Filing Date: 2025-12-31
Form Type: 424B3
Source: 0001628280-25-059235
Chunk: 264

Company: QT IMAGING HOLDINGS, INC.
Filing Date: 2025-12-31
Form: 424B3
Chunk 264
---
 up; or (iii) December 1, 2023. The QTI Working Capital Note may be prepaid without penalty. On October 26, 2023, the QTI Working Capital Note was amended to increase the outstanding principal amount to $705,000 and extend the potential maturity date from December 1, 2023 to December 31, 2023. In connection with the closing of the Business Combination, the 2022 Klock Note and the QTI Working Capital Note maturity date was extended to July 1, 2025, the Company assumed the obligations under both of these notes, and all security interests and liens in favor of Dr. Klock were removed. In connection with the issuance of the note to Lynrock Lake, on February 26, 2025, the maturity dates on both of these notes held by Dr. Klock were extended to October 21, 2027.

#### QT Imaging Holdings Agreements
Dr. Klock has previously operated a medical practice as a sole proprietorship under the name QT Imaging Center (the “

#### Practice
”), where, among other things, patients can receive scans using a QT Breast Scanner. Dr. Klock retired effective December 31, 2024, and notified the Company that he is no longer operating the Practice, which since that time, has been run by a different party that is not affiliated with the Company, but that the Company understands Dr. Klock has an economic interest.

#### Data Use and License Agreement
On April 3, 2024, the Company entered into a Data Use and License Agreement with the Practice, that conducts a medical practice and provides medical services, pursuant to which the Company was granted a license to use and disclose certain de-identified health information, as has been de-identified by the Practice in accordance with

<div align='center'>171</div>

applicable law, for use in research and analytical processes in connection with the Company’s development and commercialization of the QT Ultrasound Breast Scanner-1 and other technologies.

#### Space Sublease
On January 23, 2025, the Company entered into a Sublease Agreement (the “

#### Sublease
”) with the Practice, pursuant to which the Practice will sublease certain space, currently leased from Hamilton Landing Novato LLC by the Company pursuant to the “Prime Lease” (as defined in the Sublease), to the Practice for use in its operations, on a full-time and exclusive basis. The Practice shall pay to