Form4insider filings, from the source

Company · CIK 0000723188 · SIC 6021 — National Commercial Banks · NYSE

COMMUNITY FINANCIAL SYSTEM, INC. · CBU

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $75k · 3sales $945k · 2net −$869k
$10k$10k$100k$100k$1M$1MbuyssalesSep 2024Jan 2025May 2025Sep 2025Jan 2026May 2026Sep 2026

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 9, 2026 PForm 4 →Sep 10, 3:57 pm EDTSavneet SinghDirector400$62.47$24,988418+2,222%
Aug 27, 2026 PForm 4 →Aug 28, 4:26 pm EDTJohn A VaccaroDirector317$63.11$20,006492+181%
Aug 24, 2026 PForm 4 →Aug 26, 12:07 pm EDTBrenda M HallDirector476$63.59$30,271515+1,221%
Jun 25, 2026 SForm 4 →Jun 29, 11:13 am EDTMark J. BolusDirector12,191$67.00$816,78694,060−11.5%
Jun 10, 2026 FMForm 4 →Jun 11, 4:21 pm EDTDeresa Fischer DurkeeSVP, Chief Accounting Officer2,949$54.55$160,8825,478—
Jun 8, 2026 SForm 4 →Jun 10, 11:33 am EDTEric StickelsDirector2,000$63.98$127,96231,592−5.95%

Reported at this company — derivatives (options, RSUs, warrants)

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Sep 17, 2026 AForm 4 →Sep 18, 9:33 am EDTJohn A VaccaroDirector347$62.77$21,750984—
Sep 17, 2026 AForm 4 →Sep 18, 9:24 am EDTMichele SullivanDirector396$62.77$24,8754,381—
Jun 18, 2026 AForm 4 →Jun 18, 3:53 pm EDTMichele SullivanDirector406$61.24$24,8753,960—
Jun 18, 2026 AForm 4 →Jun 18, 3:41 pm EDTJohn A VaccaroDirector320$61.24$19,625635—
Jun 10, 2026 MForm 4 →Jun 11, 4:21 pm EDTDeresa Fischer DurkeeSVP, Chief Accounting Officer1,623——1,794—