Clean Harbors, Inc. (CLH) Ownership
CLH ownership summary
as of October 18, 2026- Institutions
- 96.7% of shares outstanding
- Insiders
- 4.92% of shares outstanding
- Shares outstanding
- 52.8M
- Float
- 50.0M shares available to trade
- Short interest
- 2.15% 1.1M shares short
- Days to cover
- 2.77 short interest up 2.6% vs prior month
- Institutions 96.67%
- Insiders 4.92%
CLH top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 9.62% | 5.1M | $1.62B | +273,728 (+5.7%) | June 30, 2026 |
| 2 | Wellington Management Company LLP | 5.98% | 3.2M | $1.01B | −421,801 (−11.8%) | June 30, 2026 |
| 3 | FMR Inc | 5.69% | 3.0M | $961.0M | +901,475 (+42.9%) | June 30, 2026 |
| 4 | HHG PLC | 4.46% | 2.4M | $753.9M | −20,694 (−0.9%) | March 31, 2026 |
| 5 | Vanguard Capital Management, LLC | 4.14% | 2.2M | $698.7M | +13,608 (+0.6%) | June 30, 2026 |
| 6 | Vanguard Portfolio Management, LLC | 3.76% | 2.0M | $634.8M | +20,385 (+1.0%) | June 30, 2026 |
| 7 | Jupiter Topco LLC | 3.03% | 1.6M | $511.6M | +1.6M (0.0%) | June 30, 2026 |
| 8 | State Street Corp | 3.00% | 1.6M | $506.3M | +44,707 (+2.9%) | June 30, 2026 |
| 9 | D1 Capital Partners L.P. | 2.49% | 1.3M | $421.0M | −22,780 (−1.7%) | June 30, 2026 |
| 10 | Geode Capital Management, LLC | 2.14% | 1.1M | $361.4M | +183,348 (+19.4%) | June 30, 2026 |
| 11 | ClearBridge Advisors, LLC | 2.13% | 1.1M | $360.6M | −76,033 (−6.3%) | June 30, 2026 |
| 12 | First Trust Advisors L.P. | 1.88% | 993K | $317.9M | +214,729 (+27.6%) | June 30, 2026 |
| 13 | Snyder Capital Management LP | 1.75% | 922K | $295.2M | −7,145 (−0.8%) | June 30, 2026 |
| 14 | The Goldman Sachs Group Inc | 1.71% | 900K | $288.1M | −28,852 (−3.1%) | June 30, 2026 |
| 15 | Durable Capital Partners LP | 1.69% | 892K | $285.6M | −158,568 (−15.1%) | June 30, 2026 |
| 16 | Fidelity International Ltd | 1.66% | 877K | $280.8M | +367,754 (+72.2%) | June 30, 2026 |
| 17 | Bessemer Group Inc | 1.45% | 763K | $244.2M | −168,999 (−18.1%) | June 30, 2026 |
| 18 | Select Equity Group LP | 1.38% | 728K | $233.1M | −403,228 (−35.6%) | June 30, 2026 |
| 19 | NORGES BANK | 1.20% | 632K | $202.3M | −16,979 (−2.6%) | June 30, 2026 |
| 20 | Pictet Asset Manangement SA | 1.15% | 609K | $194.9M | −633,334 (−51.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 3.6M shares and 11 cut 2.0M.
CLH top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 3.38% | 1.8M | $571.7M | −636 (−0.0%) | September 30, 2026 |
| 2 | Fidelity Contrafund | 3.26% | 1.7M | $550.5M | −566 (−0.0%) | August 31, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 2.86% | 1.5M | $483.5M | −4,472 (−0.3%) | August 31, 2026 |
| 4 | Vanguard Small Cap Index | 2.03% | 1.1M | $342.3M | −24,805 (−2.3%) | September 30, 2026 |
| 5 | First Trust RBA Amer Indl RenaisTM ETF | 1.48% | 779K | $249.4M | +450 (+0.1%) | September 30, 2026 |
| 6 | Janus Henderson Enterprise D | 1.34% | 705K | $225.8M | −34,568 (−4.7%) | August 31, 2026 |
| 7 | Vanguard MStar Small Cap Growth Indx Inv | 1.13% | 595K | $190.4M | −33,124 (−5.3%) | September 30, 2026 |
| 8 | Fidelity Global Small Cap Opps F | 0.81% | 426K | $136.3M | — | June 30, 2026 |
| 9 | Vanguard Explorer Inv | 0.71% | 377K | $120.7M | −203,925 (−35.1%) | June 30, 2026 |
| 10 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.70% | 371K | $118.7M | +7,510 (+2.1%) | September 30, 2026 |
| 11 | Fidelity Contrafund K6 | 0.70% | 368K | $117.7M | −906 (−0.2%) | August 31, 2026 |
| 12 | Pictet-Water I EUR | 0.67% | 352K | $112.6M | −439,845 (−55.6%) | June 30, 2026 |
| 13 | Nordea 1 - Global Climate & Envir BI EUR | 0.66% | 347K | $111.1M | −7,028 (−2.0%) | August 31, 2026 |
| 14 | State Street SPDR Port S&P 400 Md CpETF | 0.50% | 265K | $84.9M | −376 (−0.1%) | September 30, 2026 |
| 15 | Hood River Small-Cap Growth Instl | 0.48% | 253K | $80.9M | +173,198 (+217.6%) | June 30, 2026 |
| 16 | Fidelity Extended Market Index | 0.46% | 242K | $77.5M | −1,885 (−0.8%) | August 31, 2026 |
| 17 | Janus Henderson Triton D | 0.45% | 239K | $76.7M | −18,236 (−7.1%) | August 31, 2026 |
| 18 | HC Snyder US All Cap Equity Fdr USD Acc | 0.43% | 228K | $73.1M | +7,147 (+3.2%) | May 31, 2026 |
| 19 | Hartford MidCap Y | 0.40% | 211K | $67.5M | −1,470 (−0.7%) | August 31, 2026 |
| 20 | iShares Russell Mid-Cap ETF | 0.40% | 210K | $67.2M | +380 (+0.2%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
CLH insider transactions
latest 19| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-18 | Marcy L Reed | Sell | $287.94 | 836 | $240,718 |
| 2026-03-18 | Eric W Gerstenberg | Sell | $293.00 | 1,000 | $293,000 |
| 2026-03-17 | Brian P Weber | Sell | $293.39 | 4,683 | $1.4M |
| 2026-02-23 | April McClain Delaney | Buy | $280.46 | — | — |
| 2026-02-20 | Eric J Dugas | Sell | $281.31 | 2,788 | $784,292 |
| 2026-02-20 | Sharon M Gabriel | Sell | $282.07 | 3,540 | $998,528 |
| 2026-02-19 | John R Welch | Sell | $273.07 | 750 | $204,802 |
| 2025-12-16 | Eric W Gerstenberg | Sell | $240.90 | 601 | $144,781 |
| 2025-12-03 | April McClain Delaney | Buy | $236.97 | — | — |
| 2025-08-07 | April McClain Delaney | Sell | $242.08 | — | — |
| 2025-08-01 | Michael Louis Battles | Buy | $233.50 | 2,000 | $467,000 |
| 2025-07-31 | Andrea Robertson | Sell | $233.64 | 836 | $195,323 |
| 2025-06-20 | April McClain Delaney | Sell | $226.33 | — | — |
| 2025-06-13 | Brian P Weber | Sell | $227.17 | 3,035 | $689,461 |
| 2025-06-06 | Eric W Gerstenberg | Sell | $225.23 | 8,076 | $1.8M |
| 2025-06-05 | Alison A Quirk | Sell | $223.69 | 893 | $199,755 |
| 2025-05-28 | John R Welch | Sell | $228.51 | 1,250 | $285,638 |
| 2025-05-27 | Robert Speights | Sell | $228.49 | 1,022 | $233,517 |
| 2025-05-22 | Lauren States | Sell | $226.17 | 836 | $189,078 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
CLH shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns CLH
Institutional investors own 96.7% of Clean Harbors's shares and insiders 4.92%. The largest holder is BlackRock Inc with 9.62% of the shares (5.1M), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 11 reduced their stake in the latest filings. Short interest is 2.15% of the float, or 2.77 days of average trading volume. The share count fell 10.5% since 2014.
Related: CLH analyst forecast, CLH key metrics. See the CLH stock overview for the latest quote and news.
CLH ownership FAQ
Who owns the most Clean Harbors stock?
The largest shareholders of Clean Harbors are BlackRock Inc (9.62%), Wellington Management Company LLP (5.98%), FMR Inc (5.69%), HHG PLC (4.46%), Vanguard Capital Management, LLC (4.14%).
What percentage of Clean Harbors is owned by institutions?
Institutions hold 96.7% of Clean Harbors's shares outstanding; insiders hold 4.92%.
Which funds own Clean Harbors?
The largest fund holders of Clean Harbors are iShares Core S&P Mid-Cap ETF (3.38%), Fidelity Contrafund (3.26%), Vanguard MStar Total Stk Mkt Idx Invest (2.86%), Vanguard Small Cap Index (2.03%), First Trust RBA Amer Indl RenaisTM ETF (1.48%).
What is Clean Harbors's short interest?
1.1M shares of Clean Harbors were sold short, 2.15% of the float; at the average daily volume it would take 2.77 days to cover.
Are insiders buying or selling Clean Harbors?
Of the latest 19 reported insider transactions in Clean Harbors (since May 22, 2025), 3 were purchases and 16 were sales.
How many shares of Clean Harbors are outstanding?
Clean Harbors has 52.8M shares outstanding, of which 50.0M are in the public float.