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Of the 17 tracked institutions holding CLH, 9 have a 3-year clone track record — 7 of them beat the S&P. Average holder's clone alpha: +2.4pt. It's a gauge of who owns the name, not just how many.
Among the 17 tracked institutional investors we monitor, CLH (CLEAN HARBORS INC) is held with a combined value of $6.00B across 21,125,015 shares. The largest holder is BlackRock, Inc. with a position worth $1.52B (0.02% of their portfolio). 3 funds opened new positions in the most recent quarter. 8 funds increased their holdings. 6 funds reduced their position.
Total Institutional Value
$6.00B
Total Shares Held
21,125,015
Institutional Holders
17
% of Shares Outstanding
40.0%
of 52.85M shares · SEC 2026-05-01
Days to Cover
2.6-15.1%
1.11M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 40.0% of CLH's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-05-01), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $1.52B | 0.02% | +5.7% |
| 2 | VANGUARD GROUP INC | $1.05B | 0.02% | -1.4% |
| 3 | WELLINGTON MANAGEMENT GROUP LLP | $942.63M | 0.16% | -11.8% |
| 4 | FMR LLC | $897.04M | 0.04% | +42.9% |
| 5 | STATE STREET CORP | $472.62M | 0.01% | +2.9% |
| 6 | D1 Capital Partners L.P. | $393.01M | 1.13% | -1.7% |
| 7 | Durable Capital Partners LP | $266.61M | 2.59% | -15.1% |
| 8 | AQR CAPITAL MANAGEMENT LLC | $142.82M | 0.05% | +164.6% |
| 9 | CITADEL ADVISORS LLC | $93.91M | 0.05% | +802.7% |
| 10 | TWO SIGMA ADVISERS, LP | $75.39M | 0.15% | +35.7% |
SEC Schedule 13D (activist) and 13G (passive) filings for CLH. Filed when an investor acquires 5%+ ownership.
| Member | Type | Date |
|---|---|---|
| April McClain Delaney | Sell | Aug 25, 2026 |
| April McClain Delaney | Sell | Jul 28, 2026 |
| April McClain Delaney | Sell | Jul 27, 2026 |
| April McClain Delaney | Sell |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of CLH with a position worth $1.52B, representing 0.02% of their portfolio. In total, 17 institutional investors hold CLH with a combined value of $6.00B.
In the most recent quarter, 3 funds opened a new position in CLH. Additionally, 8 increased their holdings and 6 reduced their positions.
Institutional investors hold $6.00B worth of CLH stock across 17 positions. The largest institutional holder is BlackRock, Inc. with $1.52B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For CLH, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their CLH positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Jul 24, 2026 |
| April McClain Delaney | Sell | May 1, 2026 |
| April McClain Delaney | Sell | Apr 30, 2026 |
| April McClain Delaney | Buy | Feb 23, 2026 |
| April McClain Delaney | Buy | Dec 3, 2025 |
Showing 8 of 13. STOCK Act disclosures lag up to 45 days.
Last Close
$320.94
2026-09-10
YTD
+31.8%
96% of 52-week range
