Community Financial System, Inc. (the “Company”) (NYSE: CBU) reported second quarter 2025 results that are included in the attached supplement. This earnings release and attached supplement are also available within the ”News” section of the Company's investor relations website at https://communityfinancialsystem.com/news. A replay of the earnings call webcast will also be available on this site for at least one year.

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Second Quarter 2025 Performance Summary

• Net income of $51.3 million, or $0.97 per share, increased $0.06 per share from the prior year’s second quarter and increased $0.04 per share from the first quarter of 2025

• Operating net income¹ of $55.4 million, or $1.04 per share, increased $0.09 per share from the prior year’s second quarter and increased $0.06 per share from the first quarter of 2025

• Total revenues of $199.3 million, a new quarterly record for the Company, increased $15.5 million, or 8.4%, from the prior year’s second quarter and increased $3.0 million, or 1.5%, from the first quarter of 2025

• Net interest income of $124.7 million, a new quarterly record for the Company, increased $15.3 million, or 14.0%, from the prior year’s second quarter and increased $4.5 million, or 3.8%, from the first quarter of 2025

• Total non-bank financial services (employee benefit services, insurance services and wealth management services) noninterest revenues of $54.5 million, increased $0.3 million, or 0.6%, from the prior year’s second quarter and decreased $2.2 million, or 3.9%, from the first quarter of 2025

• Operating pre-tax, pre-provision net revenue (“PPNR”)¹ of $75.1 million, or $1.41 per share, increased $0.12 per share from the prior year’s second quarter and increased $0.01 per share from the first quarter of 2025

• Total ending loans of $10.52 billion increased $98.0 million, or 0.9%, from the end of the first quarter of 2025 and increased $495.3 million, or 4.9%, from the end of the prior year’s second quarter

• Total ending deposits of $13.70 billion decreased $190.3 million, or 1.4%, from the end of the first quarter of 2025 and increased $563.9 million, or 4.3%, from the end of the prior year’s second quarter

¹Non-GAAP Measure. For more information on Non-GAAP measures refer to “Non-GAAP Measures” section along with the Quarterly GAAP to Non-GAAP Reconciliations included within the “Summary of Financial Data (unaudited)” tables included within the Company’s earnings release supplement.

Company management will host a conference call at 11:00 a.m. (ET) today, July 22, 2025, to discuss the second quarter 2025 results. The conference call can be accessed at https://app.webinar.net/n7jl8918GAN or via dial-in at 1-833-630-0464 (1-412-317-1809 if outside the United States and Canada).

About Community Financial System, Inc.

Community Financial System, Inc. is a diversified financial services company that is focused on four main business lines – banking services, employee benefit services, insurance services and wealth management services. Its banking subsidiary, Community Bank, N.A., is among the country’s 100 largest banking institutions with over $16 billion in assets and operates approximately 200 customer facilities across Upstate New York, Northeastern Pennsylvania, Vermont, and Western Massachusetts. The Company’s Benefit Plans Administrative Services, Inc. subsidiary is a leading provider of employee benefits administration, trust services, collective investment fund administration, and actuarial consulting services to customers on a national scale. The Company’s OneGroup NY, Inc. subsidiary is a top 66 U.S. insurance agency. The Company also offers comprehensive financial planning, trust administration and wealth management services through its Nottingham Financial Group operating unit. The Company is listed on the New York Stock Exchange and the Company’s stock trades under the symbol CBU. For more information about the Company and each of its four main business lines visit https://communityfinancialsystem.com.

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