As of the latest Form 4 filed Jun 29, 2026.
What Community Bank System Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 35 most recent filings for CBU.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-29 | 2026-06-25 | Bolus Mark J. Director | SSale | −12.2K | $67.00 | $817K | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | Durkee Deresa Fischer SVP, Chief Accounting Officer | FTax | −1.33K | $64.77 | $85.9K | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | Durkee Deresa Fischer, SVP, Chief Accounting Officer | MExercise | +1.20K | $44.27 | $52.9K | No | Form 4 ↗ |
| 2026-06-11 | 2026-06-10 | Durkee Deresa Fischer, SVP, Chief Accounting Officer | MExercise | +427.00 | $51.64 | $22.1K | No | Form 4 ↗ |
| 2026-06-10 | 2026-06-08 | STICKELS ERIC Director | SSale | −2.00K | $63.98 | $128K | No | Form 4 ↗ |
| 2026-05-05 | 2026-05-04 | Wlos Marya Burgio EVP & Chief Financial Officer | FTax | −273.00 | $63.62 | $17.4K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | STEELE SALLY A Director | MExercise | +9.00 | — | — | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Pecor Raymond C III Director | MExercise | +9.00 | — | — | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Parente John Director | MExercise | +9.00 | — | — | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Knauss Jeffery J Director | MExercise | +9.00 | — | — | No | Form 4 ↗ |
| 2026-03-23 | 2026-03-19 | Pecor Raymond C III Director | MExercise | +1.25K | — | — | No | Form 4 ↗ |
| 2026-03-23 | 2026-03-19 | STEELE SALLY A Director | MExercise | +1.25K | — | — | No | Form 4 ↗ |
| 2026-03-23 | 2026-03-19 | Knauss Jeffery J Director | MExercise | +1.25K | — | — | No | Form 4 ↗ |
| 2026-03-23 | 2026-03-19 | Parente John Director | MExercise | +1.25K | — | — | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-16 | STICKELS ERIC Director | MExercise | +250.00 | — | — | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Abdo Michael N EVP and General Counsel | FTax | −707.24 | $59.87 | $42.3K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Abdo Michael N, EVP and General Counsel | AAward | +1.95K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Gillan-Myer Maureen A EVP, Chief Admin & HR Officer | FTax | −943.06 | $59.87 | $56.5K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Gillan-Myer Maureen A, EVP, Chief Admin & HR Officer | AAward | +2.56K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Karaivanov Dimitar President & CEO | FTax | −2.83K | $59.87 | $169K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Karaivanov Dimitar, President & CEO | AAward | +5.22K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Gillan-Myer Maureen A EVP, Chief Admin & HR Officer | FTax | −522.00 | $60.55 | $31.6K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Durkee Deresa Fischer SVP, Chief Accounting Officer | FTax | −357.00 | $60.55 | $21.6K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Abdo Michael N EVP and General Counsel | FTax | −485.00 | $60.55 | $29.4K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Durkee Matthew K SVP, Chief Banking Officer | FTax | −399.00 | $60.55 | $24.2K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Karaivanov Dimitar President & CEO | FTax | −2.50K | $60.55 | $151K | No | Form 4 ↗ |
| 2026-03-04 | 2025-12-29 | Gillan-Myer Maureen A EVP, Chief Admin & HR Officer | SSale | −3.45K | $58.85 | $203K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Whipple John F. Director | SSale | −4.25K | $65.17 | $277K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Whipple John F., Director | MExercise | +4.25K | $38.02 | $161K | No | Form 4 ↗ |
| 2026-02-05 | 2026-02-03 | STEELE SALLY A Director | SSale | −4.00K | $64.12 | $256K | No | Form 4 ↗ |
| 2026-02-05 | 2026-02-03 | STEELE SALLY A, Director | MExercise | +4.00K | $23.04 | $92.2K | No | Form 4 ↗ |
| 2026-02-05 | 2026-02-03 | STICKELS ERIC Director | SSale | −2.00K | $64.75 | $129K | No | Form 4 ↗ |
| 2026-02-03 | 2026-01-30 | Abdo Michael N EVP and General Counsel | FTax | −1.76K | $62.44 | $110K | No | Form 4 ↗ |
| 2026-02-03 | 2026-01-30 | Abdo Michael N, EVP and General Counsel | MExercise | +2.29K | $38.02 | $87.0K | No | Form 4 ↗ |
| 2024-05-02 | 2024-04-30 | SUTARIS JOSEPH E EVP & Chief Financial Officer | II | +3.54K | $43.22 | $153K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CBU’s full analysis or the market-wide insider trading feed. The tabs above jump to CBU’s other SEC data.
Source: SEC Form 4 filings for CBU, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.