Clean Harbors (CLH)Chair sold ~$28.1M

~$28.1M

Approx. value · 100K sh @ $281.14

2.28M

Holds after · shares reported

Traded

Feb 19, 2026

Filed

Feb 23, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Dec 3, 2025CongressDisclosed purchase of CLH — reported range $1,001 - $15,000
2. Feb 3, 2026Federal contract · $2.3M obligatedDepartment of Defense awarded CLEAN HARBORS INC: $2.31M obligated to date
3. Feb 18, 2026Company filing · Form 8-K · ResultsReported its results
4. Feb 19, 2026 · this disclosureInsider · Their largest sale since 2006Chair sold ~$28.1M of CLH shares in the open market

What came next

1. Feb 19, 2026InsiderDirector sold ~$205K of CLH shares in the open market
2. Feb 20, 2026InsiderOfficer sold ~$999K of CLH shares in the open market
3. Feb 23, 2026CongressDisclosed purchase of CLH — reported range $15,001 - $50,000
4. Mar 4, 2026InsiderChair sold ~$29.3M of CLH shares in the open market
5. Mar 17, 2026InsiderOfficer sold ~$1.37M of CLH shares in the open market
6. Mar 18, 2026InsiderDirector sold ~$241K of CLH shares in the open market
7. Apr 29, 2026Federal contract · $832K obligatedDepartment of the Treasury awarded CLEAN HARBORS INC: $832K obligated to date
8. Apr 30, 2026CongressDisclosed partial sale of CLH — reported range $1,001 - $15,000
9. May 1, 2026CongressDisclosed partial sale of CLH — reported range $1,001 - $15,000
10. May 6, 2026Company filing · Form 8-K · ResultsReported its results
11. May 11, 2026Insider · 8 days before an 8-KDirector purchased ~$136K of CLH shares in the open market
12. May 19, 2026Company filing · Form 8-K · Executive change, Reg FDChanged a top executive or board member, and shared information with investors“On May 19, 2026, Alan S. McKim, serving in the capacities of Executive Chairman of the Board of Directors (the “Board”) and Chief Technology Officer, notified the Board of his intention to retire from the Board and his role as Chief Technology Officer, effective upon the Board’s appointment of a new Chairman.”
13. May 20, 2026Federal contract · $101K obligatedDepartment of Veterans Affairs awarded CLEAN HARBORS INC: $101K obligated to date
14. May 26, 2026InsiderDirector sold ~$226K of CLH shares in the open market
15. Jun 14, 2026Federal contract · $455K obligatedDepartment of the Treasury awarded CLEAN HARBORS INC: $455K obligated to date

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Clean Harbors

For Clean Harbors, OQRO holds 5 insider filings (SEC Form 4 or Form 144), 4 Congress trade reports, 14 fund holdings reports (13F) and 2 federal contract awards dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its CLH page.

Other recent filings by Alan S Mckim, EXEC CHAIR, CTO.

• SEC Form 4 at Clean Harbors (CLH)Mar 5, 2026
• SEC Form 4 at Clean Harbors (CLH)Jun 6, 2025
• SEC Form 4 at Clean Harbors (CLH)Jun 6, 2025
• SEC Form 4 at Clean Harbors (CLH)Mar 4, 2025
• SEC Form 4 at Clean Harbors (CLH)Mar 4, 2025

The full history of Alan S Mckim, EXEC CHAIR, CTO. is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Clean Harbors

• House Clerk periodic transaction reportSep 9, 2026
• USAspending.gov award recordAug 28, 2026
• USAspending.gov award recordAug 27, 2026
• SEC Form 4Aug 18, 2026
• SEC Form 4Aug 14, 2026
• SEC Form 4Aug 14, 2026

Everything OQRO holds on this company is on its CLH page.