Community Bank System, Inc. announced the retirement of its current President and CEO, Mark E. Tryniski, effective as of December 31, 2023. He will be succeeded by Dimitar A. Karaivanov, the company's Executive Vice President and COO, effective from January 1, 2024. The Board will also expand to 13 Directors and Mr. Karaivanov will be appointed as a Director of the Company and the Bank from January 1, 2024. A new employment agreement between the company and Mr. Karaivanov, which includes his compensation details, will also be effective from January 1, 2024.