6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of February 2026

Commission File Number: 001-41362

Ostin Technology Group Co., Ltd.

(Translation of registrant’s name intoEnglish)

Building 2, 101

1 Kechuang Road

Qixia District, Nanjing

Jiangsu Province, China 210046

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ☒        Form 40-F ☐

Resignation of Chief Technology Officer

Xiaodong Zhai (“Mr. Zhai”) tendered his resignation from his position as Chief Technology Officer (“CTO”) of Ostin Technology Group Co., Ltd. (the “Company”), effective February 28, 2026. Mr. Zhai resigned for personal reasons and not as a result of any disagreement with the Company on any matter. As of the date of this report, the Company has not identified a new CTO.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: April 1, 2026

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