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NBT Bancorp stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+33.7% to $52.83
NBT Bancorp (NBTB) stock rose 34% over the last 252 sessions, to $52.83. On the way it reported 0 quarters, its insiders filed 10 open-market trades and 2 Form 144 notices of planned sales, and the company filed 2 material 8-Ks. Each is marked on the price and listed with what the stock did next.
Each mark, and what followed
| Date | Kind | What | Next session | 5 sessions | 21 sessions |
|---|---|---|---|---|---|
| Sep 21, 2026 | 8-K | Directors and officers: departures, appointments, pay | −0.7% (−0.7% vs SPY) | −0.8% (+0.2% vs SPY) | +0.7% (+1.3% vs SPY) |
| Jul 29, 2026 | Form 144 | Form 144: Sarah Halliday plans to sell $486K | +1.1% (+2.7% vs SPY) | +0.3% (−3.8% vs SPY) | −4.1% (−7.4% vs SPY) |
| Jul 29, 2026 | Form 144 | Form 144: Ruth H Mahoney plans to sell $244K | +1.1% (+2.7% vs SPY) | +0.3% (−3.8% vs SPY) | −4.1% (−7.4% vs SPY) |
| Jul 29, 2026 | Insider sale | Mahoney Ruth H sold $244K | +1.1% (+2.7% vs SPY) | +0.3% (−3.8% vs SPY) | −4.1% (−7.4% vs SPY) |
| Jul 29, 2026 | Insider sale | Halliday Sarah A sold $486K | +1.1% (+2.7% vs SPY) | +0.3% (−3.8% vs SPY) | −4.1% (−7.4% vs SPY) |
| Jun 12, 2026 | Insider sale | Sparks Martin Randolph sold $58K | +1.1% (+0.5% vs SPY) | −2.1% (−3.6% vs SPY) | +6.0% (+3.9% vs SPY) |
| Jun 12, 2026 | Insider sale | Hoeller Heidi M sold $101K | +1.1% (+0.5% vs SPY) | −2.1% (−3.6% vs SPY) | +6.0% (+3.9% vs SPY) |
| Jun 9, 2026 | Insider sale | Watt John H Jr. sold $996K | +2.1% (+2.4% vs SPY) | +2.5% (+0.4% vs SPY) | +7.7% (+5.8% vs SPY) |
| Jun 5, 2026 | Insider sale | Mahoney Ruth H sold $233K | 0.0% (+2.6% vs SPY) | +2.6% (+5.2% vs SPY) | +6.7% (+7.7% vs SPY) |
| Mar 13, 2026 | Insider sale | Sparks Martin Randolph sold $99K | +0.5% (+1.1% vs SPY) | −0.7% (+0.3% vs SPY) | +9.6% (+6.3% vs SPY) |
| Feb 17, 2026 | Insider sale | Wiles Amy sold $203K | −0.2% (−0.4% vs SPY) | −4.8% (−4.9% vs SPY) | −9.5% (−7.9% vs SPY) |
| Jan 28, 2026 | Insider buy | Delaney Timothy E bought $977K | −1.9% (−1.8% vs SPY) | +4.1% (+5.0% vs SPY) | +2.4% (+3.3% vs SPY) |
| Jan 26, 2026 | 8-K | Directors and officers: departures, appointments, pay | −1.1% (−1.5% vs SPY) | +3.4% (+3.0% vs SPY) | +2.9% (+2.9% vs SPY) |
| Nov 6, 2025 | Insider buy | Delaney Timothy E bought $410K | −2.1% (−1.0% vs SPY) | −0.8% (−1.7% vs SPY) | +1.6% (+0.4% vs SPY) |
Insiders’ record here
In the year on the chart, NBT Bancorp's insiders reported 2 open-market buys ($1.4M) and 8 sales ($2.4M). Of the 10 old enough to score, 5 were followed by the stock doing what the trade implied over the next 63 sessions (beating SPY after a buy, lagging it after a sale); the median excess return after a buy was +9.8% and after a sale +4.9%.
Across the whole universe (19,782 scored trades), insider buys beat the market 46% of the time and sales were followed by a lagging stock 61% of the time; buys of $1M or more 39%. Every pattern →
What this kind of 8-K usually did
| Item | 8-Ks | Next session, median | Up next session | 21 sessions, median | Typical size |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
Across every company in the move-odds universe, measured from the close before the filing. Every 8-K item ranked →
NBT Bancorp: every quarter → Live insider trades →
Prices are daily closes; filings and trades are as filed with the SEC (Form 4 within two business days of the trade, 8-K within four of the event). Moves after a mark are the stock's close-to-close change and the same for SPY; they describe the record, not what the next one will do. Not investment advice.