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Clean Harbors stock timeline
A year of the price with every insider trade, planned sale, earnings report and material 8-K marked
252 sessions+38.4% to $284.10
Clean Harbors (CLH) stock rose 38% over the last 252 sessions, to $284.10. On the way it reported 4 quarters, its insiders filed 3 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 |
|---|---|---|---|---|---|
| Oct 28, 2026 | Earnings | Earnings: beat the EPS estimate by 22.0% | +0.1% (−0.2% vs SPY) | −6.0% (−4.0% vs SPY) | — |
| Oct 5, 2026 | 8-K | Material definitive agreement | −1.3% (−1.9% vs SPY) | −1.0% (−1.5% vs SPY) | −9.0% (−6.3% vs SPY) |
| Aug 14, 2026 | Form 144 | Form 144: Eric W Gerstenberg plans to sell $805K | +0.5% (+0.7% vs SPY) | +0.5% (+2.5% vs SPY) | +0.9% (+3.1% vs SPY) |
| Aug 14, 2026 | Insider sale | Gerstenberg Eric W sold $803K | +0.5% (+0.7% vs SPY) | +0.5% (+2.5% vs SPY) | +0.9% (+3.1% vs SPY) |
| Aug 3, 2026 | Form 144 | Form 144: Andrea Robertson plans to sell $248K | −0.6% (−2.0% vs SPY) | −1.5% (−5.0% vs SPY) | +0.8% (−1.9% vs SPY) |
| Aug 3, 2026 | Insider sale | Robertson Andrea sold $248K | −0.6% (−2.0% vs SPY) | −1.5% (−5.0% vs SPY) | +0.8% (−1.9% vs SPY) |
| Jul 29, 2026 | Earnings | Earnings: beat the EPS estimate by 14.0% | +7.2% (+8.7% vs SPY) | +2.2% (−1.8% vs SPY) | +3.2% (−0.1% vs SPY) |
| May 26, 2026 | Insider sale | States Lauren sold $226K | −0.1% (−0.7% vs SPY) | −2.1% (−3.8% vs SPY) | +4.0% (+5.4% vs SPY) |
| May 20, 2026 | 8-K | Directors and officers: departures, appointments, pay | −3.1% (−3.3% vs SPY) | −3.7% (−5.5% vs SPY) | −0.7% (−1.4% vs SPY) |
| May 6, 2026 | Earnings | Earnings: beat the EPS estimate by 3.4% | −8.5% (−9.9% vs SPY) | −5.7% (−7.6% vs SPY) | −9.0% (−13.5% vs SPY) |
| Feb 18, 2026 | Earnings | Earnings: beat the EPS estimate by 8.6% | +2.6% (+2.1% vs SPY) | +5.6% (+5.0% vs SPY) | +7.8% (+11.0% vs SPY) |
Insiders’ record here
In the year on the chart, Clean Harbors' insiders reported 0 open-market buys ($0) and 3 sales ($1.3M). Of the 2 old enough to score, 1 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 +5.6%.
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 |
|---|---|---|---|---|---|
| 5.02 Directors and officers: departures, appointments, pay | 39,174 | −0.1% | 48% | +0.7% | ±1.4% |
| 1.01 Material definitive agreement | 23,525 | 0.0% | 51% | +1.0% | ±1.4% |
| 2.03 New debt or off-balance-sheet obligation | 13,268 | 0.0% | 50% | +1.2% | ±1.3% |
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 → Clean Harbors: 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.