{"transactions":[{"id":796360,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2026-05-01T20:22:54.000Z","date":"2026-04-29","kind":"exercise","planned":false,"acquired":false,"shares":9,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F5","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 29, 2026, the reporting person's phantom stock units were settled for 9 shares of Community Financial System, Inc. common stock, and .4418 shares were settled in cash at the price of $63.17 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 9.4418 units of phantom stock acquired on April 10, 2026 under the LTIP's dividend reinvestment feature."}],"balance_after":1220,"derivative":{"underlying":"Common Stock","underlying_shares":9},"source":{"system":"sec-edgar","filing":"0000723188-26-000086","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000086/form4.xml","form_type":"4"}},{"id":796359,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-05-01T20:22:54.000Z","date":"2026-04-29","kind":"exercise","planned":false,"acquired":true,"shares":9,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 29, 2026, the reporting person's phantom stock units were settled for 9 shares of Community Financial System, Inc. common stock, and .4418 shares were settled in cash at the price of $63.17 per share."}],"balance_after":72654.3212,"source":{"system":"sec-edgar","filing":"0000723188-26-000086","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000086/form4.xml","form_type":"4"}},{"id":831620,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2026-03-23T14:49:05.000Z","date":"2026-03-19","kind":"exercise","planned":false,"acquired":false,"shares":1254,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On March 19, 2026, the reporting person's phantom stock units were settled for 1,254 shares of Community Financial System, Inc. common stock, and .5514 shares were settled in cash at the price of $55.61 per share."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."}],"balance_after":1220,"derivative":{"underlying":"Common Stock","underlying_shares":1254},"source":{"system":"sec-edgar","filing":"0000723188-26-000076","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000076/form4.xml","form_type":"4"}},{"id":831619,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2026-03-23T14:49:05.000Z","date":"2026-03-19","kind":"exercise","planned":false,"acquired":true,"shares":1254,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On March 19, 2026, the reporting person's phantom stock units were settled for 1,254 shares of Community Financial System, Inc. common stock, and .5514 shares were settled in cash at the price of $55.61 per share."}],"balance_after":72645.3212,"source":{"system":"sec-edgar","filing":"0000723188-26-000076","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000076/form4.xml","form_type":"4"}},{"id":836186,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2026-03-18T18:31:42.000Z","date":"2026-03-17","kind":"grant","planned":false,"acquired":true,"shares":1220,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (\"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (\"LTIP\"). Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 9.6079 units of phantom stock acquired on January 12, 2026 under the LTIP's dividend reinvestment feature."}],"balance_after":2474.5514,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1220},"source":{"system":"sec-edgar","filing":"0000723188-26-000060","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318826000060/form4.xml","form_type":"4"}},{"id":966341,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Stock Option","published_at":"2025-12-17T18:55:44.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":false,"shares":4246,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":38.02,"exercise_date":"2016-03-16","expiration_date":"2026-03-16","underlying":"Common Stock","underlying_shares":4246},"source":{"system":"sec-edgar","filing":"0000723188-25-000013","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318825000013/form4.xml","form_type":"4"}},{"id":966340,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-12-17T18:55:44.000Z","date":"2025-12-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":2683,"price":60.18,"value":161462.94,"ownership":{"direct":true},"balance_after":71391.3212,"source":{"system":"sec-edgar","filing":"0000723188-25-000013","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318825000013/form4.xml","form_type":"4"}},{"id":966339,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-12-17T18:55:44.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":true,"shares":4246,"price":38.02,"value":161432.92,"ownership":{"direct":true},"balance_after":74074.3212,"source":{"system":"sec-edgar","filing":"0000723188-25-000013","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000072318825000013/form4.xml","form_type":"4"}},{"id":1171399,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2025-04-16T19:09:45.000Z","date":"2025-04-14","kind":"exercise","planned":false,"acquired":false,"shares":12,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\"). 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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 12.7836 units of phantom stock acquired on April 10, 2025 under the Plan's dividend reinvestment feature."}],"balance_after":1225,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":12},"source":{"system":"sec-edgar","filing":"0001127602-25-012098","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225012098/form4.xml","form_type":"4"}},{"id":1171398,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-04-16T19:09:45.000Z","date":"2025-04-14","kind":"exercise","planned":false,"acquired":true,"shares":12,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"On April 14, 2025, the reporting person's phantom stock units were settled for 12 shares of Community Financial System, Inc. common stock, and .7836 shares were settled in cash at the price of $51.74 per share."}],"balance_after":69828.3212,"source":{"system":"sec-edgar","filing":"0001127602-25-012098","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225012098/form4.xml","form_type":"4"}},{"id":1196395,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2025-03-20T17:28:27.000Z","date":"2025-03-19","kind":"exercise","planned":false,"acquired":false,"shares":1430,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."}],"balance_after":1225,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1430},"source":{"system":"sec-edgar","filing":"0001127602-25-010090","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225010090/form4.xml","form_type":"4"}},{"id":1196394,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2025-03-20T17:28:27.000Z","date":"2025-03-18","kind":"grant","planned":false,"acquired":true,"shares":1225,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Financial System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\").  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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Financial System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 13.032, 11.2154, and 11.1256 units of phantom stock acquired as dividend equivalents on July 10, 2024, October 10, 2024, and January 10, 2025, respectively, under the Plan."}],"balance_after":2655.373,"derivative":{"exercise_price":0,"underlying":"Common Stock","underlying_shares":1225},"source":{"system":"sec-edgar","filing":"0001127602-25-010090","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225010090/form4.xml","form_type":"4"}},{"id":1196393,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-03-20T17:28:27.000Z","date":"2025-03-19","kind":"exercise","planned":false,"acquired":true,"shares":1430,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On March 19, 2025, the reporting person's phantom stock units were settled for 1,430 shares of Community Financial System, Inc. common stock, and .373 shares were settled in cash at the price of $58.10 per share."}],"balance_after":69816.3212,"source":{"system":"sec-edgar","filing":"0001127602-25-010090","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760225010090/form4.xml","form_type":"4"}},{"id":1566622,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Phantom Stock (Deferred Stock Units)","published_at":"2024-03-20T19:38:12.000Z","date":"2024-03-19","kind":"grant","planned":false,"acquired":true,"shares":1395,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The reporting person has received deferred stock units under the Plan. 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Each phantom stock unit which represents a deferred stock unit is the economic equivalent of one share of Community Bank System, Inc. common stock and will be settled in common stock at a predetermined date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The reporting person has received deferred stock units under the Community Bank System, Inc. 2022 Long-Term Incentive Plan, as amended (the \"Plan\"). 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The reporting person undertakes to provide Community Bank System, Inc., any security holder of Community Bank System, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."}],"balance_after":17336,"source":{"system":"sec-edgar","filing":"0001127602-17-002499","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760217002499/form4.xml","form_type":"4"}},{"id":4489403,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2017-01-18T21:20:31.000Z","date":"2017-01-16","kind":"other","acquired":true,"shares":2336,"price":59.14,"value":138151.04,"ownership":{"direct":false,"nature":"By Charles E. Parente Revocable Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The Charles E. Parente Revocable Trust acquired 2,336 shares of common stock in  connection with the net settlement of stock options held by the trust."}],"balance_after":22336,"source":{"system":"sec-edgar","filing":"0001127602-17-001878","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760217001878/form4.xml","form_type":"4"}},{"id":4526468,"issuer":{"id":4178,"kind":"organization","name":"COMMUNITY FINANCIAL SYSTEM, INC.","symbol":"CBU"},"owners":[{"id":50446,"kind":"person","name":"Parente John","position":1,"cik":"0001486057","reported_name":"Parente John","relationship":{"director":true}}],"security":"Common Stock","published_at":"2016-12-12T21:01:42.000Z","date":"2016-12-08","kind":"sale","acquired":false,"shares":3566,"price":60.8874,"value":217124.4684,"ownership":{"direct":false,"nature":"By Charles E. Parente Revocable Trust"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $60.69 to $61.01, inclusive. The reporting person undertakes to provide Community Bank System, Inc., any security holder of Community Bank System, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The reporting person was appointed trustee of the Charles E. Parente Revocable Trust on October 24, 2016.  Members of the reporting person's immediate family are among the beneficiaries of the trust.  The reporting person disclaims beneficial interest of the Community Bank System, Inc. common stock held by the trust except to the extent of his pecuniary interest therein."}],"balance_after":20000,"source":{"system":"sec-edgar","filing":"0001127602-16-069665","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/723188/000112760216069665/form4.xml","form_type":"4"}}]}