As filed with the U.S. Securities and Exchange Commission on November 3, 2025. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code No.) Delaware 6770 85-1728920 (I.R.S. Employer Identification No.) Dr. Raluca Din ...

As filed with the U.S. Securities and Exchange Commission on November 3, 2025. Registration No. 333- FORM S-1 REGISTRATION STATEMENT UNDER UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code No.) Delaware 6770 85-1728920 (I.R.S. Employer Identification No.) Dr. Raluca Din ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on May 17, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 3 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Empl ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on May 17, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 3 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Empl ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on May 16, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to FORM S-1 REGISTRATION STATEMENT (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Employer Identification No.) Dr. Raluca Dinu Chief Executive Of ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on May 16, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Empl ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on April 24, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Employer Identification No.) Dr. Raluca Dinu Chief Executive Officer 3 Hamilton Landing, Suite 160, Novato, CA 94949 ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on April 24, 2024. Registration No. 333-278460 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) Delaware 6770 85-1728920 (Primary Standard Industrial Classification Code No.) (I.R.S. Em ...

Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Table of Contents As filed with the U.S. Securities and Exchange Commission on April 2, 2024. Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code No.) Delaware 6770 85-1728920 (I.R.S. Employer Identification No.) ...

Table of Contents As filed with the U.S. Securities and Exchange Commission on April 2, 2024. Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 QT Imaging Holdings, Inc. (Exact Name of Registrant as Specified in its Charter) (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code No.) Delaware 6770 85-1728920 (I.R.S. Employer Identification No.) ...