Exhibit 99.1 Financial Institutions, Inc. Reports Net Income Available to Common Shareholders of $20.8 million, or $1.04 per Diluted Share, for the Second Quarter of 2026 The Company's community bank subsidiary delivered strong loan growth of 2.7% during the quarter and its wealth manager's assets under management surpassed a new milestone of $4.0 billion WARSAW, N.Y., July 23, 2026 – Financial Institutions, Inc. (NASDAQ: FISI) (the "Company," "we" or "us") today reported financial and operational results f ...