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 | 9.10 | 4,802,492 | +4.4 | 03/31/2026 |
| Wellington Management Company LLP | 5.98 | 3,155,233 | -11.8 | 06/30/2026 |
| HHG PLC | 4.46 | 2,355,394 | -0.9 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.11 | 2,169,364 | +0.0 | 03/31/2026 |
| FMR Inc | 3.98 | 2,101,179 | +464.6 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 3.72 | 1,962,951 | +0.0 | 03/31/2026 |
| State Street Corp | 2.91 | 1,537,297 | +2.3 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.30 | 1,739,382 | +0.0 | 08/31/2026 |
| Fidelity Contrafund | 3.26 | 1,720,675 | +6.6 | 07/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 2.87 | 1,515,166 | +0.3 | 07/31/2026 |
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 | 29,797,309 $ | Jul 1, 2026 | direct |
| Gerstenberg Eric W | CO-CEO | 56,793 | 17,935,229 $ | Aug 14, 2026 | direct |
| Curtis George L | EXEC. VICE PRESIDENT (CHESI) | 44,291 | 13,987,098 $ | Jul 1, 2026 | direct |
| Mckim Alan S | EXEC CHAIR, CTO. | 30,154 | 9,522,633 $ | Jul 17, 2026 | direct |
| Robertson Andrea | Director | 8,979 | 2,835,568 $ | Aug 3, 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 |
|---|---|---|---|---|---|---|
| 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: September 18, 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.