Exhibit 99.1 Investor/Media Contacts James A. Dowd, President, CEO Justin K. Bigham, Executive Vice President, CFO Telephone: (315) 343-0057 Pathfinder Bancorp, Inc. Announces Financial Results for the First Quarter of 2026 Pathfinder earns $0.38 per share in the first quarter of 2026 while growing core deposits and commercial loans, expanding net interest margin from the fourth quarter of 2025, and reporting credit performance that benefited from last year's loan portfolio review and reserve build OSWEGO, ...