X0508 4 2024-07-03 0001844505 QT IMAGING HOLDINGS, INC. QTI 0001451693 Katz Avi S C/O QT IMAGING HOLDINGS, INC. 3 HAMILTON LANDING, SUITE 160 NOVATO CA 94949 1 1 1 0 Chairman 0001844511 GigAcquisitions5, LLC C/O QT IMAGING HOLDINGS, INC. 3 HAMILTON LANDING, SUITE 160 NOVATO CA 94949 0 0 1 0 0 Common Stock 2024-07-05 4 J 0 105773 0 D 5735000 I By GigAcquisitions5, LLC Common Stock 26593 D Stock Option (right to buy) 0.748 2024-07-03 4 A 0 40000 0 A 2034-07-03 Common Stock 40000 40000 D Private Warrants 2.3 2024-07-05 4 J 0 105773 0 D 2024-04-03 2029-03-04 Common Stock 105773 0 I By GigAcquisitions5, LLC Distribution of shares of Common Stock to direct and indirect members of GigAcqusitions5, LLC (the "Sponsor"). The total reported shares is a result of the deduction of the number of disposed shares of Common Stock from 5,840,773 shares of Common Stock as previously reported in Form 4 filed by the Reporting Person on July 1, 2024. The Common Stock is held directly by Sponsor. The shares held by the Sponsor are beneficially owned by Dr. Katz. Dr. Katz is also the Manager of the Sponsor, who has sole voting and dispositive power over the shares held by the Sponsor. One-third of the option will vest on February 15, 2025, and the remaining two thirds will vest in eight equal quarterly installments on each subsequent May 15, August 15, November 15 and February 15, such that the option will be fully vested on February 15, 2027, subject to Dr. Katz's continued service to the Issuer, through each vesting date. Distribution of Private Warrants to direct and indirect members of the Sponsor. /s/ Dr. Avi S. Katz 2024-07-09 /s/ Dr. Avi S. Katz, Managing Member 2024-07-09