GCBC Greene County Bancorp Inc - 8-K

Item 8.01

Other Events

On April 15, 2026, Greene County Bancorp, Inc. (the “Company”) announced that it had authorized a stock repurchase program for up to 400,000 shares
of the Company’s outstanding shares of common stock. This amount represents approximately 5.0% of the Company’s 7,808,300 shares of outstanding common stock held by shareholders other than Greene County Bancorp, MHC, the Company’s majority mutual
holding company parent.

A copy of the press release announcing the stock repurchase program is included as exhibit 99.1 to this report and is incorporated herein by
reference.

Item 9.01

Financial Statements and Exhibits

(d)

Exhibits

Exhibit No.

Description

99.1

Press Release, dated April 15, 2026

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)