Page 1

☐ 冈 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT UNDER SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended June 30 , 2021 OR TRANSITION REPORT UNDER SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transaction period from to Commission File Number : 0-25165 GREENE COUNTY BANCORP , INC . ( Name of registrant as specified in its Charter ) United States 14-1809721 ( State or Other Jurisdiction of Incorporation or Organization ) 302 Main Street , Catskill , New York ( Address of Principal Executive Office ) ( 518 ) 943-2600 ( I.R.S. Employer Identification No. ) ( Issuer's Telephone Number including area code ) 12414 ( Zip Code ) Securities Registered Pursuant to Section 12 ( b ) of the Act : Title of class Common Stock , $ 0.10 par value Trading symbol GCBC Name of exchange on which registered The Nasdaq Stock Market Securities Registered Pursuant to Section 12 ( g ) of the Act : None ( Title of Class ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . YES □ NO ☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Exchange Act . YES □ NO ☑ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the past twelve months ( or for such shorter period that the registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the ] past 90 days . YES ☑ NO □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit and post such files ) . YES ☑ NO □