Form 4: Clean Harbors Co-CEO Sells Shares

Clean Harbors Co-CEO Eric W. Gerstenberg reported the sale of 601 shares of common stock for $240.9 per share.

Summary

• Eric W. Gerstenberg, Co-CEO of Clean Harbors Inc. (CLH), reported a transaction involving the company's common stock.
• On December 16, 2025, Mr. Gerstenberg disposed of 601 shares of common stock.
• The shares were sold at a price of $240.9 per share.
• Following this transaction, Mr. Gerstenberg directly beneficially owns 50,454 shares of Clean Harbors common stock.
• The transaction was made pursuant to a contract, instruction, or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Sentiment

Score: 4

Explanation: The Co-CEO sold a portion of his common stock holdings. While this may be part of a pre-arranged trading plan (Rule 10b5-1(c) is checked), insider sales can sometimes be perceived as a slight negative signal for investor sentiment, though the impact is generally minor for routine sales.

Negatives

• A Co-CEO sold a portion of their common stock holdings, which can sometimes be interpreted as a slight negative signal by investors.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders may interpret the insider sale as a slight negative signal regarding management's confidence or future prospects, potentially leading to minor downward pressure on the stock price, although the transaction is noted as being under a 10b5-1 plan.

Key Dates

Recommendation

The filing reports an insider sale by a Co-CEO. While insider sales can sometimes signal a lack of confidence, this transaction involves a relatively small percentage of the executive's total holdings and is explicitly stated to be part of a pre-scheduled trading plan (Rule 10b5-1(c) is checked). Without additional context on the company's financial performance, market conditions, or other insider activity, a 'hold' recommendation is appropriate, advising investors to maintain their current position and monitor further developments.

Keywords

Clean Harbors, CLH, Insider Trading, Form 4, Stock Sale, Eric W. Gerstenberg, CO-CEO, 10b5-1 plan