Clean Harbors Inc
Ownership
Ownership Structure
Who owns Clean Harbors Inc (CLH)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 94.8% of the shares are freely tradable; institutional investors hold 97.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.62 | 5,076,220 | +5.7 | 06/30/2026 |
| Wellington Management Company LLP | 5.98 | 3,155,233 | -11.8 | 06/30/2026 |
| FMR Inc | 5.69 | 3,002,654 | +42.9 | 06/30/2026 |
| HHG PLC | 4.46 | 2,355,394 | -0.9 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.14 | 2,182,972 | +0.6 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.76 | 1,983,336 | +1.0 | 06/30/2026 |
| Jupiter Topco LLC | 3.03 | 1,598,574 | +0.0 | 06/30/2026 |
| State Street Corp | 3.00 | 1,582,004 | +2.9 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.38 | 1,786,276 | +0.0 | 09/30/2026 |
| Fidelity Contrafund | 3.26 | 1,720,109 | +0.0 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Battles Michael Louis | CO-CEO | 94,355 | 27,815,854 $ | Jul 1, 2026 | direct |
| Gerstenberg Eric W | CO-CEO | 56,793 | 16,742,576 $ | Aug 14, 2026 | direct |
| Curtis George L | EXEC. VICE PRESIDENT (CHESI) | 44,291 | 13,056,987 $ | Jul 1, 2026 | direct |
| Mckim Alan S | EXEC CHAIR, CTO. | 30,154 | 8,889,399 $ | Jul 17, 2026 | direct |
| Geer Charles H. II | EVP, Industrial Services | 10,505 | 3,096,874 $ | Nov 2, 2026 | direct |
| Robertson Andrea | Director | 8,979 | 2,647,009 $ | Aug 3, 2026 | direct |
| Polito Karyn | Director | 4,252 | 1,253,490 $ | Oct 29, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 2, 2026 | Geer Charles H. II | EVP, Industrial Services | Other | 294 | 302.12 | 88,823 |
| Oct 29, 2026 | Polito Karyn | Director | Buy | 125 | 314.83 | 39,354 |
| Aug 14, 2026 | Gerstenberg Eric W | CO-CEO | Sell | 2,500 | 321.34 | 803,350 |
| Aug 3, 2026 | Robertson Andrea | Director | Sell | 789 | 314.01 | 247,754 |
| Jul 17, 2026 | Mckim Alan S | EXEC CHAIR, CTO. | Other | 1,265 | 310.58 | 392,884 |
| Jul 1, 2026 | Battles Michael Louis | CO-CEO | Other | 1,032 | 290.74 | 300,044 |
| Jul 1, 2026 | Curtis George L | EXEC. VICE PRESIDENT (CHESI) | Other | 1,757 | 290.74 | 510,830 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.