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Koppers Holdings stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+8.6% to $29.97
Koppers Holdings (KOP) stock rose 9% over the last 252 sessions, to $29.97. On the way it reported 5 quarters, its insiders filed 11 open-market trades and 4 Form 144 notices of planned sales, and the company filed 6 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 |
|---|---|---|---|---|---|
| Nov 6, 2026 | Earnings | Earnings: missed the EPS estimate by -46.2% | −28.0% (−28.3% vs SPY) | — | — |
| Aug 31, 2026 | Insider sale | Ball M Leroy sold $184K | −1.5% (−1.2% vs SPY) | +2.6% (+2.5% vs SPY) | −1.0% (−0.6% vs SPY) |
| Aug 19, 2026 | Insider sale | Ball M Leroy sold $138K | −1.2% (−1.4% vs SPY) | +1.5% (+1.7% vs SPY) | +1.8% (+2.4% vs SPY) |
| Aug 12, 2026 | Form 144 | Form 144: Stephen G Lucas plans to sell $58K | −1.5% (−1.7% vs SPY) | −1.2% (−0.8% vs SPY) | +0.9% (+2.6% vs SPY) |
| Aug 12, 2026 | Insider sale | Lucas Stephen G sold $58K | −1.5% (−1.7% vs SPY) | −1.2% (−0.8% vs SPY) | +0.9% (+2.6% vs SPY) |
| Aug 11, 2026 | Form 144 | Form 144: James A. Sullivan plans to sell $375K | −9.4% (−9.1% vs SPY) | −6.3% (−6.3% vs SPY) | −9.1% (−7.7% vs SPY) |
| Aug 11, 2026 | Insider sale | Sullivan James A. sold $375K | −9.4% (−9.1% vs SPY) | −6.3% (−6.3% vs SPY) | −9.1% (−7.7% vs SPY) |
| Aug 10, 2026 | Form 144 | Form 144: Bradley A Pearce plans to sell $102K | −1.4% (−1.3% vs SPY) | −8.3% (−8.7% vs SPY) | −8.2% (−7.3% vs SPY) |
| Aug 10, 2026 | Insider sale | Pearce Bradley A sold $102K | −1.4% (−1.3% vs SPY) | −8.3% (−8.7% vs SPY) | −8.2% (−7.3% vs SPY) |
| Aug 7, 2026 | Form 144 | Form 144: James A. Sullivan plans to sell $4.0M | −2.1% (−2.7% vs SPY) | −12.4% (−13.6% vs SPY) | −8.9% (−9.1% vs SPY) |
| Aug 7, 2026 | Insider sale | Sullivan James A. sold $4.0M | −2.1% (−2.7% vs SPY) | −12.4% (−13.6% vs SPY) | −8.9% (−9.1% vs SPY) |
| Aug 6, 2026 | Earnings | Earnings: beat the EPS estimate by 24.2% | +2.5% (+2.7% vs SPY) | −11.8% (−12.2% vs SPY) | −8.3% (−8.8% vs SPY) |
| Jun 18, 2026 | Insider sale | Ball M Leroy sold $150K | +0.2% (−0.8% vs SPY) | +2.4% (+3.0% vs SPY) | +12.0% (+11.6% vs SPY) |
| Jun 11, 2026 | Insider sale | Ball M Leroy sold $171K | −0.4% (−2.1% vs SPY) | +4.6% (+2.5% vs SPY) | +13.6% (+10.2% vs SPY) |
| May 13, 2026 | Insider sale | Ball M Leroy sold $113K | −2.0% (−2.5% vs SPY) | −12.8% (−12.2% vs SPY) | −4.6% (−4.5% vs SPY) |
| May 11, 2026 | 8-K | Directors and officers: departures, appointments, pay | −2.1% (−2.3% vs SPY) | −7.8% (−8.0% vs SPY) | −4.8% (−4.7% vs SPY) |
| May 8, 2026 | 8-K | Exit or disposal costs | +6.7% (+5.8% vs SPY) | +3.0% (+0.7% vs SPY) | +0.4% (−0.7% vs SPY) |
| May 8, 2026 | Earnings | Earnings: beat the EPS estimate by 51.3% | +6.7% (+5.8% vs SPY) | +3.0% (+0.7% vs SPY) | +0.4% (−0.7% vs SPY) |
| May 7, 2026 | 8-K | Directors and officers: departures, appointments, pay | +6.7% (+5.8% vs SPY) | +3.0% (+0.7% vs SPY) | +0.4% (−0.7% vs SPY) |
| Mar 18, 2026 | 8-K | Directors and officers: departures, appointments, pay | +0.3% (+0.5% vs SPY) | +1.4% (+1.8% vs SPY) | +0.9% (−6.5% vs SPY) |
| Mar 17, 2026 | Insider sale | Ball M Leroy sold $94K | −1.8% (−2.0% vs SPY) | −6.2% (−4.4% vs SPY) | −2.3% (−7.1% vs SPY) |
| Mar 2, 2026 | Insider sale | Ball M Leroy sold $231K | −3.7% (−3.8% vs SPY) | −0.4% (+1.6% vs SPY) | +1.4% (+9.3% vs SPY) |
| Feb 26, 2026 | Earnings | Earnings: beat the EPS estimate by 12.9% | +7.6% (+8.1% vs SPY) | +11.0% (+12.2% vs SPY) | +11.8% (+18.8% vs SPY) |
| Jan 9, 2026 | 8-K | Directors and officers: departures, appointments, pay | +2.5% (+1.9% vs SPY) | +5.7% (+5.3% vs SPY) | +16.3% (+15.6% vs SPY) |
| Dec 3, 2025 | 8-K | Exit or disposal costs | −4.0% (−4.1% vs SPY) | −1.4% (−2.0% vs SPY) | −8.1% (−8.9% vs SPY) |
| Nov 7, 2025 | Earnings | Earnings: beat the EPS estimate by 2.5% | −4.2% (−4.3% vs SPY) | +5.4% (+5.2% vs SPY) | +1.0% (−0.9% vs SPY) |
Insiders’ record here
In the year on the chart, Koppers Holdings' insiders reported 0 open-market buys ($0) and 11 sales ($5.6M). Of the 7 old enough to score, 2 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 — and after a sale +2.6%.
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 |
|---|---|---|---|---|---|
| 2.05 Exit or disposal costs | 954 | −0.2% | 47% | +0.5% | ±2.4% |
| 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 →
Report card: every quarter against the estimate → Koppers Holdings: 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.