Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in CLH held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 4.8M | $1.38B | +4.4% | 9.008% | 0.02% |
| 2 | WELLINGTON MANAGEMENT GROUP LLP | 3.6M | $1.03B | -31.0% | 6.709% | 0.19% |
| 3 | JANUS HENDERSON GROUP PLC | 2.4M | $675.4M | -0.9% | 4.418% | 0.33% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 2.2M | $622.0M | — | 4.069% | 0.02% |
| 5 | FMR LLC | 2.1M | $602.5M | +464.6% | 3.941% | 0.03% |
| 6 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.0M | $562.8M | — | 3.682% | 0.03% |
| 7 | LONE PINE CAPITAL LLC | 1.8M | $503.2M | +27.3% | 3.292% | 4.01% |
| 8 | STATE STREET CORP | 1.5M | $440.8M | +2.3% | 2.883% | 0.02% |
| 9 | D1 Capital Partners L.P. | 1.3M | $383.7M | -51.9% | 2.510% | 3.42% |
| 10 | Pictet Asset Management Holding SA | 1.2M | $356.1M | -34.1% | 2.330% | 0.38% |
| 11 | Clearbridge Investments, LLC | 1.2M | $344.9M | -9.5% | 2.256% | 0.30% |
| 12 | Select Equity Group, L.P. | 1.1M | $324.5M | +33.2% | 2.123% | 1.78% |
| 13 | Durable Capital Partners LP | 1.1M | $301.3M | +25.9% | 1.971% | 3.10% |
| 14 | GEODE CAPITAL MANAGEMENT, LLC | 946K | $271.3M | +3.1% | 1.774% | 0.02% |
| 15 | SNYDER CAPITAL MANAGEMENT L P | 929K | $266.5M | -19.2% | 1.743% | 5.17% |
| 16 | GOLDMAN SACHS GROUP INC | 929K | $266.4M | +258.1% | 1.743% | 0.03% |
| 17 | FIRST TRUST ADVISORS LP | 778K | $223.2M | +10.0% | 1.460% | 0.16% |
| 18 | TWO SIGMA INVESTMENTS, LP | 724K | $207.6M | +46.9% | 1.358% | 0.17% |
| 19 | DIMENSIONAL FUND ADVISORS LP | 609K | $174.5M | -1.8% | 1.142% | 0.04% |
| 20 | NORDEA INVESTMENT MANAGEMENT AB | 568K | $159.3M | -45.4% | 1.066% | 0.15% |
| 21 | UBS ASSET MANAGEMENT AMERICAS INC | 518K | $148.4M | -13.1% | 0.971% | 0.03% |
| 22 | FIL Ltd | 510K | $146.1M | +44.5% | 0.956% | 0.11% |
| 23 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 475K | $136.1M | -0.6% | 0.890% | 0.02% |
| 24 | NORTHERN TRUST CORP | 449K | $128.6M | -1.8% | 0.842% | 0.02% |
| 25 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 443K | $127.0M | +30.6% | 0.831% | 0.42% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in CLH — a direct measure of their conviction.
Filings activity in CLH during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 612 | +9.9% | 86.83% | +11.37 pp | $13.32B | +15% |
| Q4 2025 | 557 | +1.1% | 75.46% | +4.57 pp | $11.58B | +6.4% |
| Q3 2025 | 551 | 3.7% | 70.89% | +1.30 pp | $10.88B | +1.9% |
| Q2 2025 | 572 | +3.6% | 69.59% | +10.55 pp | $10.68B | +18% |
| Q1 2025 | 552 | +0.0% | 59.04% | 8.88 pp | $9.06B | 13% |
| Q4 2024 | 552 | 0.7% | 67.92% | 13.42 pp | $10.42B | 16% |
| Q3 2024 | 556 | +9.0% | 81.34% | +14.89 pp | $12.48B | +22% |
| Q2 2024 | 510 | — | 66.45% | — | $10.19B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying CLH stock.
Based on Q1 2026 13F filings, institutional ownership of Clean Harbors, Inc. stands at 86.8%, held across 612 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of CLH, with approximately 4,802,492 shares worth $1.38B as of Q1 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of CLH, including LONE PINE CAPITAL LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for CLH is 74 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
116 institutions opened new positions in CLH during Q1 2026, while 61 fully exited. 419 added to existing positions and 72 trimmed.
CLH institutional ownership rose by 11.37 percentage points quarter-over-quarter, with a net change of +55 holders.
The top 10 institutions account for 49.2% of all reported 13F value in CLH, and the top 25 account for 73.4%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Clean Harbors, Inc. (CLH) Institutional Ownership