CLH insider buying and SEC filings, explained
Clean Harbors Inc. · CIK 822818
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$175K
Insiders who bought
1
Sold (not marked 10b5-1)
$63.4M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 29, 2026 | Purchase (code P) | Karyn Polito (Director) bought 125 shares at $314.83 ($39K), reported as a purchase (code P). Holdings up 3% to 4,252 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 2, 2026, 8:04 AM ET |
| Aug 14, 2026 | Sale | Eric W. Gerstenberg (CEO) sold 2,500 shares at $321.34 ($803K). Holdings down 4% to 56,793 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 18, 2026 |
| Mar 18, 2026 | Sale Amended filing | Eric W. Gerstenberg (CEO) sold 1,000 shares at $293.00 ($293K). Holdings down 2% to 59,857 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Mar 19. | SEC filing Filed Aug 14, 2026 |
| Feb 23, 2026 | Sale Amended filing | Eric W. Gerstenberg (CEO) sold 2,500 shares at $279.86 ($700K). Holdings down 4% to 64,000 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Feb 24. | SEC filing Filed Aug 14, 2026 |
| Feb 20, 2026 | Sale Amended filing | Eric J. Dugas (CFO) sold 2,788 shares at $281.31 ($784K). Holdings down 12% to 20,021 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Feb 20. | SEC filing Filed Aug 14, 2026 |
| Aug 3, 2026 | Sale | Andrea Robertson (Director) sold 789 shares at $314.01 ($248K). Holdings down 8% to 8,979 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 3, 2026 |
| May 26, 2026 | Sale | Lauren States (Director) sold 789 shares at $286.19 ($226K). Holdings down 6% to 11,359 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 27, 2026 |
| May 11, 2026 | Purchase (code P) Amended filing | Karyn Polito (Director) bought 460 shares at $295.13 ($136K), reported as a purchase (code P). Holdings up 15% to 3,475 shares. Not marked as a 10b5-1 plan trade. This amends a filing from May 13. | SEC filing Filed May 14, 2026 |
| Mar 18, 2026 | Sale | Marcy L. Reed (Director) sold 836 shares at $287.94 ($241K). Holdings down 14% to 5,081 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 19, 2026 |
| Mar 17, 2026 | Sale | Brian P Weber (EVP (Chesi)) sold 4,683 shares at $293.39 ($1.4M). Holdings down 9% to 48,728 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 17, 2026 |
| Mar 4, 2026 | Sale | Alan S. Mckim (Chair and Director) sold 100,000 shares indirectly (by trust) at $292.65 ($29.3M). Holdings by trust down 5% to 2,065,368 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Mar 5, 2026 |
| Feb 19, 2026 | Sale | Alan S. Mckim (Chair and Director) sold 100,000 shares indirectly (by trust) at $281.14 ($28.1M). Holdings by trust down 4% to 2,275,368 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 23, 2026 |
| Feb 20, 2026 | Sale | Sharon M. Gabriel (EVP/CIO (Chesi)) sold 3,540 shares at $282.07 ($999K). Holdings down 13% to 23,193 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 20, 2026 |
| Feb 19, 2026 | Sale | John R. Welch (Director) sold 750 shares at $273.07 ($205K). Holdings down 7% to 10,237 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 20, 2026 |
| Dec 16, 2025 | Sale | Eric W. Gerstenberg (CEO) sold 601 shares at $240.90 ($145K). Holdings down 1% to 50,454 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 17, 2025 |
54 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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