Form 3 Filing by Ostin Technology Group Co., Ltd.

This filing reports the initial beneficial ownership of securities by Xiaohong Yin, a director and officer of Ostin Technology Group Co., Ltd. Ms. Yin, through JQZY Investment Management Limited, a company she solely owns and controls, holds 3,850 Class A ordinary shares of Ostin Technology Group. JQZY Investment Management Limited has sole voting and dispositive power over these shares. The filing details Ms. Yin's address in Nanjing, China, and her roles as Director and Secretary within the company. The report date is March 18, 2026, with the signature date of April 2, 2026.