QT Imaging Holdings, Inc.

Item 7.01 Regulation FD Disclosure. On August 18, 2026, QT Imaging Holdings, Inc. (the “Company”) posted a Letter to Shareholders on the Presentations webpage in the Investor Relations section of its website, www.qtimaging.com. The Letter to Shareholders contains supplemental product and operational information regarding the Company. A copy of the Letter to Shareholders is being furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information contained in, or incorporated into, this Item 7.01 of this Current Report, including Exhibit 99.1 attached hereto, is furnished under Item 7.01 of Form 8-K and shall not be deemed “filed” for the purposes of Section 18 of the Exchange Act or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into the filings of the Company under the Securities Act or the Exchange Act regardless of any general incorporation language in such filings. This Current Report shall not be deemed an admission as to the materiality of any information in this Current Report that is being disclosed pursuant to Regulation FD. Please refer to Exhibit 99.1 for a discussion of certain forward-looking statements included therein and the risks and uncertainties related thereto.