CLH Clean Harbors, Inc.

NYSE
$318.96

Clean Harbors, Inc. (CLH) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal In line Selling ran in line with CLH's own trailing one-year pace, with 0% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 2 sellers in the last 90 days
Insiders buying
1
1 transaction
Insiders selling
9
16 transactions
Purchases
$135.8K
460 shares
Sales
$65.2M
227,064 shares
Net activity
-$65.0M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $65.2M 16 transactions · 227,064 shares

Largest single sale: $29.3M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: May 11, 2026 , by Polito Karyn .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
GERSTENBERG ERIC W CO-CEO Sell 2,500 $321.34 $803.4K 56,793 −4.2% of holding
Robertson Andrea Director Sell 789 $314.01 $247.8K 8,979 −8.1% of holding
States Lauren Director Sell 789 $286.19 $225.8K 11,359 −6.5% of holding
Polito Karyn Director Buy 460 $295.13 $135.8K 3,475
GERSTENBERG ERIC W 2 fills CO-CEO Sell 2,000 $293.00 $586.0K 59,857 −3.2% of holding
Reed Marcy L. Director Sell 836 $287.94 $240.7K 5,081 −14.1% of holding
Weber Brian P EVP (CHESI) Sell 4,683 $293.39 $1.4M 48,728 −8.8% of holding
MCKIM ALAN S EXEC CHAIR, CTO. Sell 100,000 $292.65 $29.3M 2,065,368 −4.6% of holding
GERSTENBERG ERIC W 2 fills CO-CEO Sell 5,000 $279.86 $1.4M 64,000 −7.2% of holding
Dugas Eric J. 2 fills EVP CHIEF FINANCIAL OFFICER Sell 5,576 $281.31 $1.6M 20,021 −21.8% of holding
Gabriel Sharon M. EVP/CIO (CHESI) Sell 3,540 $282.07 $998.5K 23,193 −13.2% of holding
MCKIM ALAN S EXEC CHAIR, CTO. Sell 100,000 $281.14 $28.1M 2,275,368 −4.2% of holding
Welch John R. Director Sell 750 $273.07 $204.8K 10,237 −6.8% of holding
GERSTENBERG ERIC W CO-CEO Sell 601 $240.90 $144.8K 50,454 −1.2% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.