CBU

EX-99.1

2 tm2628320d1_ex99-1.htm

EXHIBIT 99.1

Exhibit 99.1

News Release

For further information, please contact:

333 Butternut Drive, Syracuse, N.Y. 13214

Marya Burgio Wlos, EVP & Chief Financial Officer

Office: (315) 299-2946

Community Financial System, Inc. Reports Third Quarter 2026 Results

SYRACUSE,

N.Y. — October 27, 2026 — Community Financial System, Inc. (the “Company” or “CFSI”) (NYSE:

CBU) reported third quarter 2026 results. The results are available within the “News” section of the Company's investor relations website or directly at https://ir.cfsi.com/Q3-2026-CBU-Earnings-Release.

Company management will host a conference call at 11:00 a.m. (ET) today, October 27, 2026, to discuss the third quarter 2026 results. The conference call can be accessed via webcast at https://app.webinar.net/EmXoj28zpxQ or via dial-in at 1-833-630-0464 (United States) or 1-412-317-1809 (International).

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 $17 billion in assets and operates approximately 200 customer facilities across Upstate New York, Northeastern Pennsylvania, Vermont, Western Massachusetts and Southern New Hampshire. 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 63 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://ir.cfsi.com.

News Release

For further information, please contact:

333 Butternut Drive, Syracuse, N.Y. 13214

Marya Burgio Wlos, EVP & Chief Financial Officer

Office: (315) 299-2946

Community Financial System, Inc. Reports Third Quarter 2026 Results

SYRACUSE, N.Y. — October 27, 2026

Community Financial System, Inc. (the “Company” or “CFSI”) (NYSE: CBU) reported third quarter 2026 net income of $61.3 million, or $1.16 per share and operating net income of $67.0 million, or $1.27 per share.

“Our businesses accelerated into the third quarter and we delivered operating diluted earnings per share1 of $1.27, up 16.5% year-over-year and 9.5% quarter-over-quarter, representing our sixth consecutive quarter of record results,” commented Dimitar A. Karaivanov, President and CEO.

“During the quarter we achieved an operating return on assets1 of 1.51% while retaining excellent balance sheet metrics. In addition, we decided to reposition the investment portfolio and pull forward some of our securities cash flows in order to both capture positive economic value and provide increased visibility into the embedded repricing earnings power of our balance sheet. Our trajectory remains intact and we expect strong performance across all of our businesses into the fourth quarter and 2027.”

Third Quarter 2026 Performance Quarter-over-Quarter

Increase (Decrease) Year-over-Year

Increase (Decrease)

Dollars in thousands, except per share data 3rd Qtr

2026 2nd Qtr

2026 3rd Qtr

2025 $ % $ %

Operating Performance Diluted Earnings Per Share $1.16 $1.16 $1.04 $0.00 0.0% $0.12 11.5%

Operating Diluted Earnings Per Share1 1.27 1.16 1.09 0.11 9.5% 0.18 16.5%

Operating Pre-Tax, Pre-Provision Net Revenue Per Share1 1.77 1.62 1.56 0.15 9.3% 0.21 13.5%

Return Metrics Return on Assets 1.38% 1.40% 1.30% - (0.02%) - 0.08%

Operating Return on Assets1 1.51% 1.40% 1.38% - 0.11% - 0.13%

Return on Equity 11.82% 12.10% 11.62% - (0.28%) - 0.20%

Operating Return on Equity1 12.93% 12.13% 12.25% - 0.80% - 0.68%

1

Third Quarter 2026 Performance (continued) Quarter-over-Quarter

Increase (Decrease) Year-over-Year

Increase (Decrease)

Dollars in thousands, except per share data 3rd Qtr 2026 2nd Qtr 2026 3rd Qtr 2025 $ % $ %

Revenues Total Revenues $227,291 $223,155 $207,052 $4,136 1.9% $20,239 9.8%

Total Operating Revenues (FTE)1 231,217 219,338 207,696 11,879 5.4% 23,521 11.3%

Noninterest Revenues 83,747 84,011 78,887 (264) (0.3%) 4,860 6.2%

Total Operating Noninterest Revenues1 86,663 79,301 78,651 7,362 9.3% 8,012 10.2%

Noninterest Revenues/Total Revenues 36.8% 37.6% 38.1% - (0.8%) - (1.3%)

Operating Noninterest Revenues/Operating Revenues (FTE)1 37.5% 36.2% 37.9% - 1.3% - (0.4%)

Net Interest Income and Margin Net Interest Income $143,544 $139,144 $128,165 $4,400 3.2% $15,379 12.0%

Net Interest Marg

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EX-99.1

2 tm2613014d1_ex99-1.htm

EXHIBIT 99.1

Exhibit 99.1

News Release

For further information, please contact:

333 Butternut Drive, Syracuse, N.Y. 13214

Marya Burgio Wlos, EVP & Chief Financial Officer

Office: (315) 299-2946

Community Financial System, Inc. Reports First Quarter 2026 Results

SYRACUSE, N.Y. — April 29, 2026 — Community Financial System, Inc. (the “Company”) (NYSE: CBU) reported first quarter 2026 results. The results are available within the “News” section of the Company's investor relations website or directly at https://communityfinancialsystem.com/Q1-2026-CBU-Earnings-Release.

Company management will host a conference call at 11:00 a.m. (ET) today, April 29, 2026, to discuss the first quarter 2026 results. The conference call can be accessed via webcast at https://app.webinar.net/qplYz5Bw2x6 or via dial-in at 1-833-630-0464 (United States) or 1-412-317-1809 (International).

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 $17 billion in assets and operates approximately 200 customer facilities across Upstate New York, Northeastern Pennsylvania, Vermont, Western Massachusetts and Southern New Hampshire. 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 68 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.

News Release

For further information, please contact:

333 Butternut Drive, Syracuse, N.Y. 13214

Marya Burgio Wlos, EVP & Chief Financial Officer

Office: (315) 299-2946

Community Financial System, Inc. Reports First Quarter 2026 Results

SYRACUSE, N.Y. — April 29, 2026

Community Financial System, Inc. (the “Company”) (NYSE: CBU) reported first quarter 2026 net income of $57.2 million, or $1.08 per share and operating net income of $61.1 million, or $1.15 per share.

“Our Company delivered another quarter of strong core performance with operating diluted earnings per share1 of $1.15, up 17.3% year-over-year and representing our fourth consecutive quarter of record results,” commented Dimitar A. Karaivanov, President and CEO.

“Our organic momentum continues across all businesses and is also supported by margin and market value tailwinds. During the quarter we achieved an operating return on assets1 of 1.42% while continuing to actively invest in organic and inorganic growth initiatives. At the same time, we remain focused on expanding operating leverage and ensuring that recent investments translate fully into bottom-line results. With our diversified financial services businesses, high-quality balance sheet and disciplined capital deployment, we are well positioned to continue to scale the Company and continue to expect strong earnings growth through the remainder of 2026.”

First Quarter 2026 Performance Quarter-over-

Quarter Increase

(Decrease) Year-over-Year

Increase (Decrease)

Dollars in thousands, except per share data 1st Qtr

2026 4th Qtr

2025 1st Qtr

2025 $ % $ %

Operating Performance Diluted Earnings Per Share $1.08 $1.03 $0.93 $0.05 4.9% $0.15 16.1%

Operating Diluted Earnings Per Share1 1.15 1.12 0.98 0.03 2.7% 0.17 17.3%

Operating Pre-Tax, Pre-Provision Net Revenue Per Share1

1.61 1.58 1.40 0.03 1.9% 0.21 15.0%

Return Metrics Return on Assets 1.33% 1.26% 1.22% - 0.07% - 0.11%

Operating Return on Assets1 1.42% 1.38% 1.28% - 0.04% - 0.14%

Return on Equity 11.51% 11.04% 11.28% - 0.47% - 0.23%

Operating Return on Equity1 12.30% 12.08% 11.84% - 0.22% - 0.46%

1

First Quarter 2026 Performance (continued) Quarter-over-

Quarter Increase

(Decrease) Year-over-Year

Increase (Decrease)

Dollars in thousands, except per share data 1st Qtr

2026 4th Qtr

2025 1st Qtr

2025 $ % $ %

Revenues Total Revenues $213,286 $215,451 $196,248 ($2,165) (1.0%) $17,038 8.7%

Total Operating Revenues (FTE)1 214,537 216,431 196,897 (1,894) (0.9%) 17,640 9.0%

Noninterest Revenues 78,574 82,026 76,036 (3,452) (4.2%) 2,538 3.3%

Total Operating Noninterest Revenues1 78,975 82,131 75,791 (3,156) (3.8%) 3,184 4.2%

Noninterest Revenues/Total Revenues 36.8% 38.1% 38.7% - (1.3%) - (1.9%)

Operating Noninterest Revenues/Operating Revenues (FTE)1 36.8%