Clean Harbors, Inc. (CLH)
CLH moved a median of +0.05% 30 minutes after news, and +0.06% by the close. How CLH actually reacts to news — the realized, point-in-time move the market made, measured across 398 labeled events over the last three years with zero look-ahead.
CLH’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.03% | 56% | 389 |
| 30-min | +0.05% | 56% | 393 |
| 60-min | +0.02% | 51% | 393 |
| to close | +0.06% | 54% | 398 |
| Middle 50% of CLH reactions | -0.29% to +0.34% |
|---|---|
| Median reaction (30-min) | +0.05% |
| Measured reactions | 398 |
Half of all Clean Harbors, Inc. news events land between -0.29% and +0.34% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How CLH reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 19 | -0.59% | 32% | -0.73% |
| Analyst downgrades | 12 | -0.01% | 50% | -0.08% |
| Coverage initiations | 26 | +0.37% | 58% | +0.29% |
| Rating reiterations | 113 | +0.03% | 52% | +0.10% |
| Price-target raises | 44 | +0.10% | 61% | +0.40% |
| Price-target cuts | 13 | -0.13% | 39% | -0.67% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how CLH ranks against every other measured name →
That’s how CLH usually reacts — get an email when it moves on news →Email me when CLH moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to CLH's baseline. Nothing else.
Recent CLH events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Clean Harbors Issues 2026 Sustainability Report | Press release | Business Wire | -0.05% | -0.71% | |
| Clean Harbors to Announce Third-Quarter 2026 Financial Results on October 28 | Press release | Business Wire | +0.40% | -0.56% | |
| Clean Harbors Completes Acquisitions of EnviroServe and ES&H | Press release | Business Wire | +0.21% | +1.21% | |
| Form 8-K CLEAN HARBORS INC For: Oct 01 | SEC filing · Form 8-K | SEC EDGAR | +0.29% | -1.25% | |
| One Rock Capital Partners Completes Sale of EnviroServe to Clean Harbors | Press release | Business Wire | +0.21% | +1.21% | |
| Form 8-K CLEAN HARBORS INC For: Sep 17 | SEC filing · Form 8-K | SEC EDGAR | +0.18% | +1.00% | |
| Clean Harbors Announces $600 Million Senior Notes Offering | Press release | Business Wire | -0.92% | -1.68% | |
| Clean Harbors Prices Offering of Senior Notes Due 2034 | Press release | Business Wire | +0.01% | -0.43% | |
| Clean Harbors to Acquire EnviroServe for $470 Million | Press release | Business Wire | +0.33% | +1.75% | |
| Form 8-K CLEAN HARBORS INC For: Aug 12 | SEC filing · Form 8-K | SEC EDGAR | +0.14% | -0.25% | |
| One Rock Capital Partners Announces Sale of EnviroServe to Clean Harbors | Press release | Business Wire | +0.33% | +1.75% | |
| Clean Harbors Announces Second-Quarter 2026 Financial Results | Press release | Business Wire | +0.01% | -1.40% | |
| Form 10-Q CLEAN HARBORS INC For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.51% | +1.25% | |
| Form 8-K CLEAN HARBORS INC For: Jul 29 | SEC filing · Form 8-K | SEC EDGAR | +0.01% | -1.40% | |
| Clean Harbors Appoints Robert Willett Chairman of the Board | Press release | Business Wire | -0.74% | +1.87% | |
| Clean Harbors to Announce Second-Quarter 2026 Financial Results on July 29 | Press release | Business Wire | -0.73% | +0.98% | |
| Clean Harbors to Participate in Upcoming Investor Conferences | Press release | Business Wire | -0.02% | -0.34% | |
| Clean Harbors Announces Retirement of Founder and Executive Chairman Alan S. McKim | Press release | Business Wire | -0.03% | -0.22% | |
| Form 8-K CLEAN HARBORS INC For: May 19 | SEC filing · Form 8-K | SEC EDGAR | -0.08% | -1.80% | |
| Form 8-K CLEAN HARBORS INC For: May 20 | SEC filing · Form 8-K | SEC EDGAR | -0.08% | -1.80% | |
| Clean Harbors Announces Acquisition of Terra Nova Solutions | Press release | Business Wire | +0.20% | +0.69% | |
| Form 8-K CLEAN HARBORS INC For: May 14 | SEC filing · Form 8-K | SEC EDGAR | +0.27% | +0.82% | |
| Clean Harbors Announces First-Quarter 2026 Financial Results | Press release | Business Wire | +1.12% | -5.36% | |
| Form 10-Q CLEAN HARBORS INC For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.05% | +0.02% | |
| Form 8-K CLEAN HARBORS INC For: May 06 | SEC filing · Form 8-K | SEC EDGAR | +1.12% | -5.36% | |
| Clean Harbors to Participate in 21st Annual Oppenheimer Industrial Growth Conference on May 7 | Press release | Business Wire | -0.41% | +1.50% | |
| Clean Harbors to Announce First-Quarter 2026 Financial Results on May 6 | Press release | Business Wire | -0.60% | -2.59% | |
| Form ARS CLEAN HARBORS INC For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.29% | +0.17% | |
| Form DEF 14A CLEAN HARBORS INC For: May 20 | SEC filing · Form DEF | SEC EDGAR | +0.07% | +0.01% | |
| Form DEFA14A CLEAN HARBORS INC | SEC filing · Form DEFA14A | SEC EDGAR | +0.09% | +0.03% | |
| Clean Harbors Formally Releases PFAS Disposal and Treatment Guidance Standards to Assist Customers and Communities with Decision Making | Press release | Business Wire | +0.51% | +0.87% | |
| Clean Harbors to Participate in Raymond James Investor Conference on March 3 | Press release | Business Wire | +0.61% | +2.53% | |
| Depot Connect International Streamlines Portfolio with Sale of Industrial and Rail Services to Clean Harbors | Press release | PR Newswire | +0.02% | +0.15% | |
| Depot Connect International stroomlijnt portfolio met verkoop van industriële en spoorwegdiensten aan Clean Harbors | Press release | PR Newswire | +0.26% | -0.95% | |
| Clean Harbors Announces Fourth-Quarter and Full-Year 2025 Financial Results | Press release | Business Wire | +1.27% | -0.39% | |
| Form 10-K CLEAN HARBORS INC For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.08% | -1.35% | |
| Form 8-K CLEAN HARBORS INC For: Feb 18 | SEC filing · Form 8-K | SEC EDGAR | +1.27% | -0.39% | |
| Clean Harbors to Announce Fourth-Quarter and Full-Year 2025 Financial Results on February 18 | Press release | Business Wire | -0.05% | -0.45% | |
| Clean Harbors to Participate in Upcoming Investor Conferences | Press release | Business Wire | -0.33% | +0.88% | |
| Clean Harbors Awarded $110 Million in Projects for PFAS Water Filtration System in Hawaii | Press release | Business Wire | +1.08% | +4.33% | |
| Clean Harbors to Participate in Goldman Sachs Industrials and Materials Conference | Press release | Business Wire | +0.32% | -1.82% | |
| Clean Harbors Announces Third-Quarter 2025 Financial Results | Press release | Business Wire | +1.76% | +2.08% | |
| Form 10-Q CLEAN HARBORS INC For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.84% | -2.34% | |
| Form 8-K CLEAN HARBORS INC For: Oct 29 | SEC filing · Form 8-K | SEC EDGAR | +1.76% | +2.08% | |
| Clean Harbors to Announce Third-Quarter 2025 Financial Results on October 29 | Press release | Business Wire | -0.12% | -1.83% | |
| Form 8-K CLEAN HARBORS INC For: Oct 09 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +1.40% | |
| Form 8-K CLEAN HARBORS INC For: Sep 25 | SEC filing · Form 8-K | SEC EDGAR | -0.69% | -0.52% | |
| Clean Harbors Announces $845 Million Senior Notes Offering | Press release | Business Wire | +0.08% | -0.44% | |
| Clean Harbors Prices Offering of Senior Notes Due 2033 | Press release | Business Wire | -0.69% | -0.52% | |
| Clean Harbors Announces Used Oil Collection Price Increases in Its Safety-Kleen Sustainability Solutions Business | Press release | Business Wire | -0.25% | -1.30% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the CLH section they belong to.
Where else CLH is measured.
CLH earnings → · Analyst actions → · SEC filings →
Other Industrials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Rollins, Inc. (ROL) | 400 | +0.04% | 53% |
| Jack Henry & Associates, Inc. (JKHY) | 399 | +0.07% | 57% |
| Dover Corporation (DOV) | 396 | +0.01% | 51% |
| ECOLOGY & ENVIRONMENT (EEI) | 396 | 0.00% | 32% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Industrials names, measured the same way →
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How the numbers are made.
How is Clean Harbors, Inc.'s median reaction calculated?
Every labeled CLH news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 398 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 56% of CLH's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does CLH's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.