Form 4: CLEAN HARBORS CO-CEO Sells 1,000 Shares

Clean Harbors CO-CEO Eric W. Gerstenberg sold 1,000 shares of common stock at $293 per share on March 18, 2026, under a Rule 10b5-1 plan.

Summary

• Eric W. Gerstenberg, Co-CEO of Clean Harbors Inc. (CLH), reported a sale of company common stock.
• The transaction involved the disposition of 1,000 shares.
• The shares were sold at a price of $293 per share.
• The transaction date was March 18, 2026.
• Following this transaction, Mr. Gerstenberg beneficially owns 38,877 shares of Clean Harbors common stock.
• The sale was conducted pursuant to a Rule 10b5-1 pre-arranged trading plan.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral event. The sale is a routine insider transaction under a Rule 10b5-1 plan, which mitigates any negative signaling typically associated with insider selling.

Negatives

• An insider sale, even under a Rule 10b5-1 plan, can sometimes be interpreted negatively by the market as it reduces the insider's direct stake in the company.

Future Outlook

NA

Industry Context

StockSavvy.ai notes that insider sales are a routine part of executive compensation and financial planning, especially when executed under a Rule 10b5-1 plan, which pre-schedules transactions to avoid accusations of trading on material non-public information. This particular sale by a Co-CEO of a waste management and environmental services company is a standard disclosure.

Comparison to Industry Standards

• Insider transactions are common across all industries.
• The sale of 1,000 shares by a Co-CEO of a company like Clean Harbors (a leader in environmental and industrial services) at $293 per share is a relatively small percentage of his total holdings (38,877 shares remaining), suggesting it is likely part of a routine diversification or liquidity event rather than a signal of lack of confidence.

Stakeholder Impact

• Shareholders: May observe a slight decrease in insider ownership, but the Rule 10b5-1 plan suggests no immediate negative implications.

Key Dates

Recommendation

The filing reports a routine insider sale under a Rule 10b5-1 plan, which is a pre-scheduled transaction and does not typically signal a change in management's outlook on the company. The sale of 1,000 shares represents a small fraction of the Co-CEO's total holdings, suggesting it is for personal financial planning rather than a lack of confidence. Therefore, this specific filing alone does not warrant a change in investment thesis, leading to a "hold" recommendation.

Keywords

Clean Harbors, CLH, Insider Trading, Form 4, Stock Sale, Executive Compensation, Eric W. Gerstenberg, Rule 10b5-1