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 Mar 31, 2025
Ownership Breakdown
580
Institutional Holders
▼ 11 vs Q4
$9.77B
Total Inst. Value
▼ $1.55B vs Q4
52.85M
Shares Outstanding
freeFloat 94.82%
48.93M
13F Shares Held
▼ 344,571 vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
WELLINGTON MANAGEMENT GROUP LLP hazardous waste management | 5.29M | 9.85% | 9.85% | $1.04T | May 13, 2025 | ▲ 1.25M |
VANGUARD GROUP INC hazardous waste management | 4.63M | 8.61% | 8.61% | $912.04B | May 9, 2025 | ▼ 31.8K |
BLACKROCK, INC. hazardous waste management | 4.58M | 8.53% | 8.53% | $903.61B | May 2, 2025 | ▼ 75.7K |
JANUS HENDERSON GROUP PLC hazardous waste management | 2.14M | 3.98% | 3.98% | $421.61B | May 15, 2025 | ▲ 526.4K |
PICTET ASSET MANAGEMENT HOLDING SA hazardous waste management | 1.73M | 3.23% | 3.23% | $341.74B | May 5, 2025 | ▲ 75.7K |
STATE STREET CORP hazardous waste management | 1.58M | 2.94% | 2.94% | $311.91B | May 15, 2025 | ▲ 13.6K |
CLEARBRIDGE INVESTMENTS, LLC hazardous waste management | 1.24M | 2.31% | 2.31% | $245.09B | May 13, 2025 | ▲ 88.1K |
SNYDER CAPITAL MANAGEMENT L P hazardous waste management | 1.12M | 2.07% | 2.07% | $219.81B | May 15, 2025 | ▼ 22.6K |
SELECT EQUITY GROUP, L.P. hazardous waste management | 1.09M | 2.03% | 2.03% | $215.26B | May 15, 2025 | ▼ 659.3K |
BESSEMER GROUP INC hazardous waste management | 1.01M | 1.88% | 1.88% | $199.63B | Apr 23, 2025 | ▼ 82.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
27
Increased
+4.04M shares1
New Positions
first time holders21
Decreased
−3.65M shares0
Sold Out
fully exitedNet shares change (top 50)
+394.1K
+4.04M / −3.65M
Net new holders
+7
1 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 92.6% of total shares outstanding. Company insiders own approximately 5.18%, while retail and public investors account for the remaining 2.22%.
The largest institutional shareholder of Clean Harbors, Inc. is WELLINGTON MANAGEMENT GROUP LLP, holding approximately 5.29 million shares — equal to 9.85% of outstanding shares — as of March 31, 2025.
A total of 580 institutional investors currently hold CLH stock, with a combined institutional value of approximately $9.77 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 92.6% of shares. The largest shareholder is WELLINGTON MANAGEMENT GROUP LLP with a 9.85% stake. Company insiders hold 5.18%. Data sourced from SEC Form 13F as of March 31, 2025.