As filed with the U.S. Securities and Exchange Commission on November 14, 2024 Registration No. 333-280312 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 3 to FORM F-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 YSX Tech. Co., Ltd (Exact name of registrant as specified in its charter) Ying Li, Esq. Lisa Forcht, Esq. Hunter Taubman Fischer & Li LLC 48 Wall Street, Suite 1100 New York, NY 10005 212-530-2206 Jason T. Simon, Esq. Yangyang Jia, Esq. Greenberg Tr ...