CLH CLEAN HARBORS INC Insider Trading

EVP Brian P. Weber sells 4.7K CLH shares at $293.39; holds 48.7K post-sale.

Brian P. Weber, EVP (CHESI), executed an open-market sale of 4,683 shares at $293.39 on 2026-03-17, reducing his holdings from 53,411 to 48,728 shares. The transaction occurred near the 52-week high of $297.15 (-2.2%), in a period of strong recent momentum (+6.1% in 30 days, +22.2% in 90 days). His prior sale at CLH in 2024 was followed by a +15.0% 90-day return, indicating that sale was poorly timed; this current sale happens at elevated valuations (P/E 40.75, market cap $15.4B) with no obvious fundamental trigger evident in the latest quarterly results ($1.5B revenue, $118.8M net income). The modest 8.8% reduction in holdings suggests neither significant conviction shift nor urgent portfolio action.

MCKIM ALAN S sold 100,000 CLH shares at $292.65 on 2026-03-04 for $29,265,000.00; retains 2,065,368 shares post-transaction.

MCKIM ALAN S, in his role as Executive Chair and CTO, executed an open-market sale of 100,000 shares (100.0K shares) at $292.65 on 2026-03-04, reducing his holdings by 4.6% to 2,065,368 shares (2.07M shares). The transaction price of $292.65 is only 2.5% below the 52-week high of $297.15, indicating the sale occurred near peak valuation levels. At the same-ticker level, MCKIM's four prior measurable sales at CLH posted positive 90-day returns in all cases (+7.7%, +6.9%, +7.0%, +7.9%), suggesting his prior exits at this stock have not aligned with subsequent price declines—a pattern consistent with poorly timed sells. The executive remains a substantial shareholder with over 2.06M shares post-transaction, preserving meaningful skin in the game despite this seven-figure divestiture.

CLH co-CEO sold 2,500 shares at $279.86 on 2026-02-23; stock near 52-week high at $284.66.

Eric W. Gerstenberg, as co-CEO, sold 2,500 shares (5.5% of holdings) at $279.86, reducing his position from 45.5K to 43.0K shares. The sale occurred near the stock's 52-week high of $284.69 and follows strong recent momentum (+9.7% over 30 days, +25.4% over 90 days). At the same ticker, his prior 5 sales showed mixed timing results: 3 were followed by positive 30/90-day returns, 1 was negative, and at the 90-day mark only 1 of 5 prior sales was well-timed (20% success rate). This moderate-sized open-market reduction, timed near recent highs, provides limited forward signal given the insider's inconsistent execution pattern at CLH and the absence of any scheduled trading plan disclosure.

MCKIM ALAN S (EXEC CHAIR, CTO.) sold 100,000 shares of CLH at $281.14 for $28,114,000.00 on 2026-02-19; retains 2,265,368 shares

MCKIM's sale of 100,000 shares (100.0K shares) represents a 4.2% reduction of his prior holdings while retaining substantial ownership at 2,265,368 shares (2.27M shares). At the $281.14 transaction price, the sale occurred near the 52-week high of $284.69, and the stock has since appreciated 8.2% in 30 days and 25.4% in 90 days post-transaction. His prior five trades at CLH each generated positive 90-day returns ranging from +6.9% to +9.0%, establishing a consistent pattern of post-sale appreciation at this ticker; however, none of these prior five CLH sales were well-timed on a 90-day basis (zero were preceded by declines). The company's P/E of 39.39, combined with quarterly net income of $118,799,000.00 and annual revenue growth of +2.4%, provides context for valuation. As EXEC CHAIR and CTO., this sale is significant but does not constitute majority holding divestiture, and the continued large position suggests ongoing operational alignment.

EVP/CIO Gabriel Sharon M. sells 3,540 shares of CLH at $282.07; stock near 52-week high ($284.69 current), up 31.2% in 90 days

Gabriel Sharon M. sold 3,540 shares at $282.07, reducing his holdings by 13.2% to 23,193 shares. The sale occurred near the stock's 52-week high of $284.69, with CLH up 31.2% over the prior 90 days. His cross-ticker track record shows 1 prior sell with an average 90-day return of +7.4%, indicating prior sales have not coincided with subsequent declines. At the same ticker (CLH), his prior 2023 sell also failed to precede a decline (90d return +7.4%), leaving no pattern of well-timed exits. Fundamentals show a mature business—$1.5B in quarterly revenue with modest 2.4% annual growth and a P/E of 39.93—suggesting the stock's sharp recent gains may reflect factors beyond operational acceleration.

CFO Dugas sells 2,788 CLH shares at $281.31; stock now at $284.69 (52-wk high). Holdings reduce 14.9%.

Eric J. Dugas, EVP Chief Financial Officer, sold 2,788 shares (2.8K shares) at $281.31 on 2026-02-20 for a total value of $784,292.28 ($784.3K), reducing his holdings by 14.9% to 15,933 shares (15.9K shares). The sale occurred near the 52-week high of $284.69, with the stock up 8.8% over 30 days and 31.2% over 90 days. Dugas's prior trades at CLH show mixed timing outcomes: a buy in March 2025 that gained 18.1% over 90 days, a May 2024 sale that gained 16.1% in the 90-day window post-sale (poorly timed), and an August 2023 sale that declined 4.9% (well-timed). The current sale occurs at an elevated price amid strong recent momentum, but without additional context from FLAGS or strategic announcements, the transaction represents a partial reduction in an already-substantial remaining position rather than a complete exit.

Clean Harbors CO-CEO Battles buys 2,000 shares at $233.50; stock up 6.4% in 90 days and near 52-week highs.

Michael Louis Battles, as CO-CEO, purchased 2,000 shares of CLH at $233.50, increasing his holdings from 80,911 to 82,911 shares. The purchase occurred at a price 10.2% below the 52-week high of $263.39, with the stock posting a +6.4% gain over the prior 90 days and +1.0% over the prior 30 days. His prior three transactions at CLH were all sales (2024-09-16, 2023-08-04, 2023-07-03), with 2 of 3 well-timed at the 90-day mark on the sell side. Fundamentals show CLH trading at a P/E of 32.97 with recent quarterly revenue of $1,549,854,000 and net income of $126,905,000, supporting an 8.9% annual revenue growth rate. The buy follows a pattern of portfolio management that has favored selling; this open-market purchase merits tracking to discern whether it reflects a shift in his assessment of the company's trajectory.

Co-CEO Gerstenberg sells 8,076 CLH shares at $225.23; retains 51,619 shares post-sale

GERSTENBERG ERIC W sold 8,076 shares (8.1K shares) at $225.23 on 2025-06-06, reducing his CLH holdings by 13.5% to 51,619 shares. At his cross-ticker track record, prior sells have averaged a 90-day return of +6.4% with a well-timed rate of 25.00%, indicating mixed execution timing historically. However, his ticker-specific history at CLH shows only 1 of 4 prior sells were well-timed at the 90-day mark, with most recent prior sale on 2024-11-15 generating a -7.7% 90-day return (well-timed). The current stock is -14.4% from its 52-week high of $263.39 and up +17.3% over the past 90 days, placing it near mid-range valuation within recent bands. Continued observation of this selling pattern and subsequent price action would provide context for assessing whether systematic reductions signal operational considerations or other factors distinct from discretionary exit timing.

MCKIM sells 100,000 CLH shares at $224.47 blended average for $22.4M; retains 2.30M post-sale.

MCKIM ALAN S (Executive Chair and CTO) executed 2 separate open-market sales totaling 100,000 shares for $22,446,950.40 over June 4–5, 2025, at prices of $225.40 and $223.80. Post-transaction holdings of 2.30M shares represent a -4.2% reduction from the prior 2.40M shares. The blended average price of $224.47 sits 14.2% below the 52-week high of $263.39 and 1.5% above the 30-day price change. Across his same-ticker history at CLH, his 5 prior sells were uniformly poorly timed at the 90-day mark, with 0 of 5 showing negative post-sale returns; this filing's timing cannot be assessed until 90 days have passed. The company trades at a P/E of 30.96 with recent quarterly revenue of $1.4B and net income of $58.7M, positioning it as a large-cap incumbent.

CLH President Robert Speights sold 2,725 shares at $190.44 on 2025-03-10; stock down -18.0% in 30 days.

Robert Speights, President of Industrial Services at Clean Harbors, sold 2,725 shares for $518,949.00 on 2025-03-10. His remaining stake of 40,008 shares represents a 6.4% reduction from his pre-transaction holdings of 42,733 shares. The sale occurred when the stock was trading at $190.44, and the broader market context shows the stock has declined 18.0% over the past 30 days and 23.7% over 90 days, currently trading at $192.13, down 27.0% from its 52-week high of $263.39. While the company fundamentals remain solid with $1.5B quarterly revenue, +8.9% annual growth, and 23.46 P/E, the recent sharp price decline coincides with this insider reduction in holdings.