Clean Harbors Inc. (CLH) Insider Trading

Last 12 months

Insiders bought $136k and sold $63.4M on the open market.

None of the selling was scheduled in advance under a 10b5-1 plan. EXEC CHAIR, CTO. Alan S McKim sold $29.3M on Mar 4 outside a plan.

Net open-market

−$63.3M

1 buy · 13 sales

Under a 10b5-1 plan

of the value sold

Insiders who bought / sold

1 / 9

executives and directors

Last open-market buy

May 2026

May 11, 2026

Get an email when CLH's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 14	Eric W Gerstenberg CO-CEO	SoldNo plan	2,500	$321.34	$803k	4.2%	Form 4
Aug 3	Andrea Robertson Director	SoldNo plan	789	$314.01	$248k	8.1%	Form 4
May 26	Lauren States Director	SoldNo plan	789	$286.19	$226k	6.5%	Form 4
May 11	Karyn Polito Director	Bought	460	$295.13	$136k	15%	Form 4
Mar 18	Eric W Gerstenberg CO-CEO	SoldNo plan	1,000	$293.00	$293k	1.6%	Form 4
Mar 18	Marcy L. Reed Director	SoldNo plan	836	$287.94	$241k	14%	Form 4
Mar 17	Brian P Weber EVP (CHESI)	SoldNo plan	4,683	$293.39	$1.37M	8.8%	Form 4
Mar 4	Alan S McKim EXEC CHAIR, CTO.	SoldNo plan	100,000	$292.65	$29.3M	4.2%	Form 4
Feb 23	Eric W Gerstenberg CO-CEO	SoldNo plan	2,500	$279.86	$700k	3.8%	Form 4
Feb 20	Eric J. Dugas EVP CHIEF FINANCIAL OFFICER	SoldNo plan	2,788	$281.31	$784k	12%	Form 4
Feb 20	Sharon M. Gabriel EVP/CIO (CHESI)	SoldNo plan	3,540	$282.07	$999k	13%	Form 4
Feb 19	Alan S McKim EXEC CHAIR, CTO.	SoldNo plan	100,000	$281.14	$28.1M	4.1%	Form 4
Feb 19	John R. Welch Director	SoldNo plan	750	$273.07	$205k	6.8%	Form 4
Dec 16, 2025	Eric W Gerstenberg CO-CEO	SoldNo plan	601	$240.90	$145k	1.2%	Form 4
Aug 1, 2025	Michael Louis Battles CO-CEO	Bought	2,000	$233.50	$467k	2.5%	Form 4
Jul 31, 2025	Andrea Robertson Director	SoldNo plan	836	$233.64	$195k	7.8%	Form 4
Jun 13, 2025	Brian P Weber EVP (CHESI)	SoldNo plan	3,035	$227.17	$689k	5.3%	Form 4
Jun 6, 2025	Eric W Gerstenberg CO-CEO	SoldNo plan	8,076	$225.23	$1.82M	14%	Form 4
Jun 4, 2025 – Jun 5, 2025	Alan S McKim EXEC CHAIR, CTO.	SoldNo plan 2 parts	100,000	$224.47 average	$22.4M	3.9%	Form 4
Jun 5, 2025	Alison A. Quirk Director	SoldNo plan	893	$223.69	$200k	23%	Form 4
May 28, 2025	John R. Welch Director	SoldNo plan	1,250	$228.51	$286k	9.9%	Form 4
May 27, 2025	Robert Speights PRESIDENT, INDUSTRIAL SERVICES	SoldNo plan	1,022	$228.49	$234k	5.9%	Form 4
May 22, 2025	Lauren States Director	SoldNo plan	836	$226.17	$189k	6.6%	Form 4
Mar 10, 2025	Robert Speights PRESIDENT, INDUSTRIAL SERVICES	SoldNo plan	2,725	$190.44	$519k	6.4%	Form 4
Mar 10, 2025	Eric J. Dugas EVP CHIEF FINANCIAL OFFICER	Bought	1,050	$191.38	$201k	4.5%	Form 4
Mar 3, 2025	Alan S McKim EXEC CHAIR, CTO.	SoldNo plan 2 parts	52,999	$210.28 average	$11.1M	2.0%	Form 4
Feb 18, 2025	Lauren States Director	Sold10b5-1 plan	308	$228.79	$70k	2.5%	Form 4
Jan 15, 2025	Lauren States Director	Sold10b5-1 plan	308	$239.04	$74k	2.5%	Form 4
Dec 16, 2024	Lauren States Director	Sold10b5-1 plan	308	$245.06	$75k	2.4%	Form 4
Nov 27, 2024	Brian P Weber EVP (CHESI)	SoldNo plan	861	$261.31	$225k	1.4%	Form 4
Nov 15, 2024	Lauren States Director	Sold10b5-1 plan	308	$249.78	$77k	2.3%	Form 4
Nov 15, 2024	Eric W Gerstenberg CO-CEO	SoldNo plan	6,051	$250.42	$1.52M	9.8%	Form 4
Nov 5, 2024	Robert Speights PRESIDENT, INDUSTRIAL SERVICES	SoldNo plan	610	$240.14	$146k	1.5%	Form 4

Aug 14No plan
Eric W Gerstenberg
CO-CEO · sold 2,500 at $321.34
$803k
4.2% of stake
Aug 3No plan
Andrea Robertson
Director · sold 789 at $314.01
$248k
8.1% of stake
May 26No plan
Lauren States
Director · sold 789 at $286.19
$226k
6.5% of stake
May 11
Karyn Polito
Director · bought 460 at $295.13
$136k
15% of stake
Mar 18No plan
Eric W Gerstenberg
CO-CEO · sold 1,000 at $293.00
$293k
1.6% of stake
Mar 18No plan
Marcy L. Reed
Director · sold 836 at $287.94
$241k
14% of stake
Mar 17No plan
Brian P Weber
EVP (CHESI) · sold 4,683 at $293.39
$1.37M
8.8% of stake
Mar 4No plan
Alan S McKim
EXEC CHAIR, CTO. · sold 100,000 at $292.65
$29.3M
4.2% of stake
Feb 23No plan
Eric W Gerstenberg
CO-CEO · sold 2,500 at $279.86
$700k
3.8% of stake
Feb 20No plan
Eric J. Dugas
EVP CHIEF FINANCIAL OFFICER · sold 2,788 at $281.31
$784k
12% of stake
Feb 20No plan
Sharon M. Gabriel
EVP/CIO (CHESI) · sold 3,540 at $282.07
$999k
13% of stake
Feb 19No plan
Alan S McKim
EXEC CHAIR, CTO. · sold 100,000 at $281.14
$28.1M
4.1% of stake
Feb 19No plan
John R. Welch
Director · sold 750 at $273.07
$205k
6.8% of stake
Dec 16, 2025No plan
Eric W Gerstenberg
CO-CEO · sold 601 at $240.90
$145k
1.2% of stake
Aug 1, 2025
Michael Louis Battles
CO-CEO · bought 2,000 at $233.50
$467k
2.5% of stake
Jul 31, 2025No plan
Andrea Robertson
Director · sold 836 at $233.64
$195k
7.8% of stake
Jun 13, 2025No plan
Brian P Weber
EVP (CHESI) · sold 3,035 at $227.17
$689k
5.3% of stake
Jun 6, 2025No plan
Eric W Gerstenberg
CO-CEO · sold 8,076 at $225.23
$1.82M
14% of stake
Jun 4, 2025 – Jun 5, 2025No plan
Alan S McKim
EXEC CHAIR, CTO. · sold 100,000 at avg $224.47
$22.4M
3.9% of stake
Jun 5, 2025No plan
Alison A. Quirk
Director · sold 893 at $223.69
$200k
23% of stake
May 28, 2025No plan
John R. Welch
Director · sold 1,250 at $228.51
$286k
9.9% of stake
May 27, 2025No plan
Robert Speights
PRESIDENT, INDUSTRIAL SERVICES · sold 1,022 at $228.49
$234k
5.9% of stake
May 22, 2025No plan
Lauren States
Director · sold 836 at $226.17
$189k
6.6% of stake
Mar 10, 2025No plan
Robert Speights
PRESIDENT, INDUSTRIAL SERVICES · sold 2,725 at $190.44
$519k
6.4% of stake
Mar 10, 2025
Eric J. Dugas
EVP CHIEF FINANCIAL OFFICER · bought 1,050 at $191.38
$201k
4.5% of stake
Mar 3, 2025No plan
Alan S McKim
EXEC CHAIR, CTO. · sold 52,999 at avg $210.28
$11.1M
2.0% of stake
Feb 18, 202510b5-1 plan
Lauren States
Director · sold 308 at $228.79
$70k
2.5% of stake
Jan 15, 202510b5-1 plan
Lauren States
Director · sold 308 at $239.04
$74k
2.5% of stake
Dec 16, 202410b5-1 plan
Lauren States
Director · sold 308 at $245.06
$75k
2.4% of stake
Nov 27, 2024No plan
Brian P Weber
EVP (CHESI) · sold 861 at $261.31
$225k
1.4% of stake
Nov 15, 202410b5-1 plan
Lauren States
Director · sold 308 at $249.78
$77k
2.3% of stake
Nov 15, 2024No plan
Eric W Gerstenberg
CO-CEO · sold 6,051 at $250.42
$1.52M
9.8% of stake
Nov 5, 2024No plan
Robert Speights
PRESIDENT, INDUSTRIAL SERVICES · sold 610 at $240.14
$146k
1.5% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch CLH, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in CLH's SEC filings or

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Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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