144 0001247575 XXXXXXXX LIVE 0001070524 GREENE COUNTY BANCORP INC 000-25165 302 MAIN STREET CATSKILL NY 12414 5189432600 Plummer, Michelle M. (GCBC) Director Common Stock Northwestern Mutual

One Northwest Boulevard Albany NY 12211

10000 282100.00 17025485 06/11/2026 NASDAQ Common 03/07/2000 Open Market Purchase Michelle Plummer N 600 03/07/2000 Cash Common 03/29/2003 Stock Recognition Award Michelle Plummer N 540 03/29/2003 Equity Comp. Common 03/30/2004 Stock Recognition Award Michelle Plummer N 1080 03/30/2004 Equity Comp. Common 03/31/2005 Stock Recognition Award Michelle Plummer N 2700 03/31/2005 Equity Comp. Common 12/22/2009 Stock Option Exercise Michelle Plummer N 5080 12/22/2009 Equity Comp. Y None. 06/11/2026 /s/ Michelle Plummer