Clean Harbors, Inc.
Clean Harbors, Inc. (CLH) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · CLH · as of Sep 30, 2025
Ownership Breakdown
580
Institutional Holders
▼ 9 vs Q2
$11.55B
Total Inst. Value
▲ $188.26M vs Q2
52.85M
Shares Outstanding
freeFloat 94.82%
49.76M
13F Shares Held
▲ 590,602 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
CLH largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WELLINGTON MANAGEMENT GROUP LLP hazardous waste management | 5.57M | 10.40% | 10.40% | $1.29T | Nov 14, 2025 | ▼ 190.9K |
VANGUARD GROUP INC hazardous waste management | 4.55M | 8.49% | 8.49% | $1.06T | Nov 7, 2025 | ▼ 30.9K |
BLACKROCK, INC. hazardous waste management | 4.53M | 8.46% | 8.46% | $1.05T | Nov 12, 2025 | ▼ 10.8K |
D1 CAPITAL PARTNERS L.P. hazardous waste management | 2.45M | 4.56% | 4.56% | $567.91B | Nov 14, 2025 | ▲ 1.00M |
JANUS HENDERSON GROUP PLC hazardous waste management | 2.16M | 4.03% | 4.03% | $501.70B | Nov 14, 2025 | ▲ 7.2K |
PICTET ASSET MANAGEMENT HOLDING SA hazardous waste management | 2.07M | 3.87% | 3.87% | $481.07B | Nov 18, 2025 | ▲ 159.3K |
STATE STREET CORP hazardous waste management | 1.52M | 2.83% | 2.83% | $351.96B | Nov 14, 2025 | ▲ 12.5K |
CLEARBRIDGE INVESTMENTS, LLC hazardous waste management | 1.43M | 2.66% | 2.66% | $331.23B | Nov 13, 2025 | ▲ 102.2K |
SNYDER CAPITAL MANAGEMENT L P hazardous waste management | 1.15M | 2.14% | 2.14% | $266.71B | Nov 12, 2025 | ▲ 83.6K |
BESSEMER GROUP INC hazardous waste management | 1.10M | 2.05% | 2.05% | $254.91B | Nov 5, 2025 | ▲ 87.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+2.56M shares2
New Positions
first time holders25
Decreased
−1.40M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.16M
+2.56M / −1.40M
Net new holders
-1
2 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
CLH insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
12
Buy transactions
2
Sell transactions
6.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
States Lauren director | May 26, 2026 | Sale | 789 | $286.19 | $225.8K | 11.4K | Form 4 ↗ |
Willett Robert director | May 20, 2026 | Award | 652 | — | — | 10.0K | Form 4 ↗ |
Welch John R. director | May 20, 2026 | Award | 652 | — | — | 10.9K | Form 4 ↗ |
Stewart Shelley JR director | May 20, 2026 | Award | 652 | — | — | 4.5K | Form 4 ↗ |
States Lauren director | May 20, 2026 | Award | 652 | — | — | 12.1K | Form 4 ↗ |
Robertson Andrea director | May 20, 2026 | Award | 652 | — | — | 9.8K | Form 4 ↗ |
Reed Marcy L. director | May 20, 2026 | Award | 652 | — | — | 5.7K | Form 4 ↗ |
Quirk Alison A. director | May 20, 2026 | Award | 652 | — | — | 3.6K | Form 4 ↗ |
PRESTON JOHN T director | May 20, 2026 | Award | 652 | — | — | 7.0K | Form 4 ↗ |
GALANTE EDWARD G director | May 20, 2026 | Award | 652 | — | — | 25.5K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Clean Harbors, Inc. (CLH) is primarily owned by institutional investors, who hold approximately 94.2% of total shares outstanding. Company insiders own approximately 5.18%, while retail and public investors account for the remaining 0.66%.
The largest institutional shareholder of Clean Harbors, Inc. is WELLINGTON MANAGEMENT GROUP LLP, holding approximately 5.57 million shares — equal to 10.40% of outstanding shares — as of September 30, 2025.
A total of 580 institutional investors currently hold CLH stock, with a combined institutional value of approximately $11.55 billion as of the most recent 13F filing period.
Frequently asked questions
CLH ownershipClean Harbors, Inc. (CLH) is primarily owned by institutional investors, who hold approximately 94.2% of shares. The largest shareholder is WELLINGTON MANAGEMENT GROUP LLP with a 10.40% stake. Company insiders hold 5.18%. Data sourced from SEC Form 13F as of September 30, 2025.