Clean Harbors Ownership & Insider Activity

Clean Harbors (CLH) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 2.5% of shares outstanding. Institutional investors hold 68.1%. Over the past 90 days, insiders made 2 sales worth $1.1M.

Shares Outstanding

52.787M

Shares Float

50.117M

Insider Shares Owned

1.312M

Insider % Owned

2.5%

Institutional Shares Held

35.940M

Institutional % Held

68.1%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$1.1M total

Net Activity

Net Selling

Net Value (90d)

-$1.1M

Clean Harbors Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Aug 14, 2026	Eric W Gerstenberg	CO-CEO	SELL	2.500K	$321.34	$803K
Aug 3, 2026	Andrea Robertson	—	SELL	789.000	$314.01	$248K
May 26, 2026	Lauren States	—	SELL	789.000	$286.19	$226K
Mar 18, 2026	Eric W Gerstenberg	CO-CEO	SELL	1.000K	$293.00	$293K
Mar 18, 2026	Marcy L Reed	—	SELL	836.000	$287.94	$241K
Mar 13, 2026	Brian P Weber	EVP (CHESI)	SELL	7.512K	$292.63	$1.7M
Mar 4, 2026	ALAN MCKIM	EXEC CHAIR, CTO.	SELL	100.000K	$292.65	$29.3M

Date	Member	Party	Chamber	Action	Amount
Jul 28, 2026	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Jul 27, 2026	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Jul 24, 2026	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
May 1, 2026	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Apr 30, 2026	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Feb 23, 2026	April McClain Delaney	D	House	P	$15,001 - $50,000
Dec 3, 2025	April McClain Delaney	D	House	P	$1,001 - $15,000
Aug 7, 2025	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Jun 20, 2025	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Feb 10, 2025	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Feb 7, 2025	April McClain Delaney	D	House	S (Partial)	$1,001 - $15,000
Jan 13, 2025	Robert Bresnahan	R	House	S	$1,001 - $15,000