X0708 D LIVE 0000862831 FINANCIAL INSTITUTIONS INC 220 LIBERTY STREET WARSAW NY NEW YORK 14569 5857861100 NEW YORK None None Corporation true Martin K Birmingham 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Director Donald K. Boswell 220 Liberty Street Warsaw NY NEW YORK 14569 Director Dawn H. Burlew 220 Liberty Street Warsaw NY NEW YORK 14569 Director Andrew W. Dorn, Jr. 220 Liberty Street Warsaw NY NEW YORK 14569 Director Robert M. Glaser 220 Liberty Street Warsaw NY NEW YORK 14569 Director Bruce W. Harting 220 Liberty Street Warsaw NY NEW YORK 14569 Director Susan R. Holliday 220 Liberty Street Warsaw NY NEW YORK 14569 Director Robert N. Latella 220 Liberty Street Warsaw NY NEW YORK 14569 Director Angela J. Panzarella 220 Liberty Street Warsaw NY NEW YORK 14569 Director Robert L. Schrader 220 Liberty Street Warsaw NY NEW YORK 14569 Director Kim E. VanGelder 220 Liberty Street Warsaw NY NEW YORK 14569 Director Mark A. Zupan 220 Liberty Street Warsaw NY NEW YORK 14569 Director Samuel J. Burruano 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Sandra L. Byers 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Laurie R. Collins 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Blake G. Jones 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Eric W. Marks 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Gary A. Pacos 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer William J. Plants 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Kevin B. Quinn 220 Liberty Street Warsaw NY NEW YORK 14569 Executive Officer Commercial Banking Decline to Disclose 06b false 2025-12-11 false true false 100000 Piper Sandler & Co. 665 None None 1251 Avenue of the Americas 6th Floor New York NY NEW YORK 10020 CT CONNECTICUT GA GEORGIA KS KANSAS MI MICHIGAN MO MISSOURI NJ NEW JERSEY NY NEW YORK NC NORTH CAROLINA OK OKLAHOMA PA PENNSYLVANIA VA VIRGINIA WV WEST VIRGINIA false 80000000 80000000 0 false 35 1080000 0 0 false FINANCIAL INSTITUTIONS INC W. Jack Plants, II W. Jack Plants, II EVP, Chief Financial Officer 2025-12-17