$CLH

$313.51 +$0.59 (0.19%) Live

$CLH Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 52.7M shares outstanding

Who owns CLH?

By type of holder

Institutions 93.8% Insiders 6.2% Everyone else 0.0%

Concentration Top 10 holders own 44.4%

BlackRock, Inc. 9.6% · Wellington Management Group LLP 6.0%

Institutional ownership

93.8%

+0.2 pts vs last qtr

Institutional holders

663

+36 vs last qtr

Net shares bought

+103.3K

by institutions in Q2 2026

New / sold out

100 / 64

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jupiter Topco LLC NEW +1.6M
FMR LLC +901.5K

Biggest sellers in Q2 2026

Janus Henderson Group PLC SOLD OUT −2.4M
Lone Pine Capital LLC SOLD OUT −1.8M

Who is planning to sell?

Notices of proposed sale, last 12 months

$65.9M

13 notices from 9 people

Shares covered

229.3K

0.43% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Alan S. McKim Officer $59.8M
Gerstenberg Eric W Officer $1.95M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−6.6%

−0.76% a year

Each share's claim on the business

+7.1%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$673M vs $204M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years64% 3–5 years12% 1–3 years10% Under 1 year15%

Quarterly turnover

16.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CLH on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	5.1M	9.63%	+273.7K (+5.7%)	≤2021	0.0%
Shares held by quarter Peak holding5.1M (Q2'26) Change over 8 quarters+444.6K Share of the company9.630% BlackRock, Inc.'s full portfolio →
WM Wellington Management Group LLP	3.2M	5.98%	−421.8K (−11.8%)	≤2021	0.2%
Shares held by quarter Peak holding5.8M (Q2'25) Change over 8 quarters−296.5K Share of the company5.980% Wellington Management Group LLP's full portfolio →

BlackRock, Inc.

5.1M

% of company

9.63%

Change vs last qtr

+273.7K (+5.7%)

Held since

≤2021

Wellington Management Group LLP

3.2M

% of company

5.98%

Change vs last qtr

−421.8K (−11.8%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Clean Harbors Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CLH on Form N-PORT; together they hold 38.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$508M	1.7M	3.22%	0.41%	June 30, 2026
FC Fidelity Contrafund Fidelity Contrafund	$482M	1.6M	3.06%	0.27%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$508M

% of company

3.22%

% of the fund

0.41%

As of

June 30, 2026

Fidelity Contrafund

Position value

$482M

% of company

3.06%

% of the fund

0.27%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Clean Harbors Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MA Mckim Alan S Insider	2.9M	5.54%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company5.540% Mckim Alan S's insider activity →
BM Battles Michael Louis Insider	94.4K	0.18%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.180% Battles Michael Louis's insider activity →

Mckim Alan S

Insider

2.9M

% of company

5.54%

Change vs last qtr

—

Held since

—

Battles Michael Louis

Insider

94.4K

% of company

0.18%

Change vs last qtr

—

Held since

—

20 more holders behind a free account

See every insider and 5%+ holder of Clean Harbors Inc.

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