SEC Form 4
Clean Harbors, Inc (CLH) insider trading
In the 12 months to Oct 24, 2026, 9 CLH insiders reported open-market sales of $63.4M across 13 filings; one director bought $135.8K.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $63.4M
- 13 filings · 9 insiders
- Open-market purchases
- $135.8K
- 1 filing · Karyn Polito, Director
Who traded CLH, and when
- Purchase
- Sale
CLH daily close from Oct 24, 2025 to Oct 23, 2026, between $201.73 and $326.34, last $318.76. 13 sale and 1 purchase filings by 10 insiders, marked at their filing dates. Alan S. Mckim, EXEC CHAIR, CTO.: sold $57.4M across 2 filings, first filed Feb 23, 2026, last Mar 5, 2026. Eric W. Gerstenberg, CO-CEO: sold $1.9M across 4 filings, first filed Dec 17, 2025, last Aug 18, 2026. Brian P. Weber, EVP (CHESI): sold $1.4M across 1 filing, first filed Mar 17, 2026, last Mar 17, 2026. Sharon M. Gabriel, EVP/CIO (CHESI): sold $998.5K across 1 filing, first filed Feb 20, 2026, last Feb 20, 2026. Eric J. Dugas, EVP CHIEF FINANCIAL OFFICER: sold $784.3K across 1 filing, first filed Aug 14, 2026, last Aug 14, 2026. Andrea Robertson, Director: sold $247.8K across 1 filing, first filed Aug 3, 2026, last Aug 3, 2026. Karyn Polito, Director: bought $135.8K across 1 filing, first filed May 14, 2026, last May 14, 2026. 3 others: sold $671.3K across 3 filings, first filed Feb 20, 2026, last May 27, 2026.
Largest mark · tap a row for others
Alan S. Mckim · EXEC CHAIR, CTO.
Sale $29,265,000
100,000 shares at $292.65 avg
Filed Mar 5, 2026 · traded Mar 4
Close on filing date $289.74
Alan S. Mckim · EXEC CHAIR, CTO.
EXEC CHAIR, CTO.
$57.4M soldEric W. Gerstenberg · CO-CEO
CO-CEO
$1.9M soldBrian P. Weber · EVP (CHESI)
EVP (CHESI)
$1.4M soldSharon M. Gabriel · EVP/CIO (CHESI)
EVP/CIO (CHESI)
$998.5K soldEric J. Dugas · EVP CHIEF FINANCIAL OFFICER
EVP CHIEF FINANCIAL OFFICER
$784.3K soldAndrea Robertson · Director
Director
$247.8K soldKaryn Polito · Director
Director
$135.8K bought3 others
Combined, one mark per week
$671.3K soldHas Clean Harbors, Inc's CEO sold stock?
Yes. Eric W. Gerstenberg (CEO) sold 6,601 shares ($1.9M) between Dec 2025 and Aug 2026. Michael Louis Battles (CEO) made no open-market sales filed as CEO in the last 12 months.
Open-market trades
14 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Alan S. Mckim | EXEC CHAIR, CTO. | $57.4M | — | 2 | — | |
| Eric W. Gerstenberg | CO-CEO | $1.9M | — | 4 | — | |
| Brian P. Weber | EVP (CHESI) | $1.4M | — | 1 | — | |
| Sharon M. Gabriel | EVP/CIO (CHESI) | $998.5K | — | 1 | — | |
| Eric J. Dugas | EVP CHIEF FINANCIAL OFFICER | $784.3K | — | 1 | — | |
| Andrea Robertson | Director | $247.8K | — | 1 | — | |
| Marcy L. Reed | Director | $240.7K | — | 1 | — | |
| Lauren States | Director | $225.8K | — | 1 | — | |
| John R. Welch | Director | $204.8K | — | 1 | — | |
| Karyn Polito | Director | — | $135.8K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Eric W. Gerstenberg CO-CEO | Sale | 2,500 | $321.34 | $803.3K | 56,793 | |
traded | Eric W. Gerstenberg CO-CEO | Sale | 2,500 | $279.86 | $699.7K | 64,000 | |
traded | Eric W. Gerstenberg CO-CEO | Sale | 1,000 | $293.00 | $293.0K | 59,857 | |
traded | Eric J. Dugas EVP CHIEF FINANCIAL OFFICER | Sale | 2,788 | $281.31 | $784.3K | 20,021 | |
traded | Andrea Robertson Director | Sale | 789 | $314.01 | $247.8K | 8,979 | |
traded | Lauren States Director | Sale | 789 | $286.19 | $225.8K | 11,359 | |
traded | Karyn Polito Director | Purchase | 460 | $295.13 | $135.8K | 3,475 | |
traded | Marcy L. Reed Director | Sale | 836 | $287.94 | $240.7K | 5,081 | |
traded | Brian P. Weber EVP (CHESI) | Sale | 4,683 | $293.39 | $1.4M | 48,728 | |
traded | Alan S. Mckim EXEC CHAIR, CTO. | Sale | 100,000 | $292.65 | $29.3M | 2,065,368 | |
traded | Alan S. Mckim EXEC CHAIR, CTO. | Sale | 100,000 | $281.14 | $28.1M | 2,275,368 | |
traded | John R. Welch Director | Sale | 750 | $273.07 | $204.8K | 10,237 | |
traded | Sharon M. Gabriel EVP/CIO (CHESI) | Sale | 3,540 | $282.07 | $998.5K | 23,193 | |
traded | Eric W. Gerstenberg CO-CEO | Sale | 601 | $240.90 | $144.8K | 50,454 |
GET /stocks/filings/vX/form-4?tickers=CLH&filing_date.gte=2025-10-24&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"CLH",
"CLHB"
],
"issuer_cik": "0000822818",
"owner_cik": "0001211558",
"accession_number": "0001211558-26-000020",
"form_type": "4",
"filing_date": "2026-08-18",
"period_of_report": "2026-08-14",
"issuer_name": "CLEAN HARBORS INC",
"issuer_trading_symbol": "CLH",
"owner_name": "GERSTENBERG ERIC W",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CO-CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-08-14",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 2500,
"transaction_price_per_share": 321.34,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 56793,
"transaction_value": 803349.9999999999,
"direct_or_indirect": "D"
},
{
"tickers": [
"CLH",
"CLHB"
],
"issuer_cik": "0000822818",
"owner_cik": "0001211558",
"accession_number": "0001211558-26-000016",
"form_type": "4/A",
"filing_date": "2026-08-14",
"period_of_report": "2026-03-18",
"issuer_name": "CLEAN HARBORS INC",
"issuer_trading_symbol": "CLH",
"owner_name": "GERSTENBERG ERIC W",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CO-CEO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-03-18",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 1000,
"transaction_price_per_share": 293,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 59857,
"transaction_value": 293000,
"date_of_original_submission": "2026-03-19",
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "Correction to Total Number of Shares Held."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 79 records
- Tax withholding36 records
- Grants and awards29 records
- Gifts5 records
- Other9 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
Build this yourself
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for CLH every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.