CLEAN HARBORS INC (CLH) Stock Institutional Trading Activity


CLEAN HARBORS INC (CLH) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Lone Pine Capital, Durable Capital Partners, Renaissance Technologies LLC, Turtle Creek Asset Management, and Third Avenue Management. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Durable Capital PartnersBuy261,097834,763$195,735,228
Q4 2025Lone Pine CapitalBuy1,378,1251,378,125$323,142,750
Q3 2025Renaissance Technologies LLCBuy7,86911,302$2,624,550
Q3 2025Durable Capital PartnersBuy573,666573,666$133,216,719
Q1 2025Renaissance Technologies LLCSell-21,2003,433$676,644
Q4 2024Renaissance Technologies LLCSell-5,10024,633$5,669,039
Q3 2024Renaissance Technologies LLCSell-25,60029,733$7,186,763
Q2 2024Renaissance Technologies LLCSell-70,30255,333$12,513,558
Q1 2024Renaissance Technologies LLCSell-47,898125,635$25,292
Q4 2023Renaissance Technologies LLCSell-56,200173,533$30,283
Q3 2023Renaissance Technologies LLCSell-67,800229,733$38,448
Q2 2023Renaissance Technologies LLCSell-190,102297,533$48,923
Q1 2023Renaissance Technologies LLCSell-43,200487,635$69,517
Q4 2022Renaissance Technologies LLCBuy91,200530,835$60,579
Q3 2022Renaissance Technologies LLCBuy63,202439,635$48,351
Q2 2022Renaissance Technologies LLCBuy13,700376,433$33,002
Q1 2022Renaissance Technologies LLCSell-5,700362,733$40,496
Q4 2021Renaissance Technologies LLCSell-54,302368,433$36,759
Q3 2021Renaissance Technologies LLCSell-89,698422,735$43,909
Q2 2021Renaissance Technologies LLCSell-262,802512,433$47,728
Q1 2021Renaissance Technologies LLCSell-329,200775,235$65,166
Q4 2020Renaissance Technologies LLCSell-123,1001,104,435$84,048
Q3 2020Renaissance Technologies LLCSell-40,1001,227,535$68,779
Q2 2020Renaissance Technologies LLCSell-235,0001,267,635$76,033
Q1 2020Renaissance Technologies LLCSell-375,0001,502,635$77,145
Q4 2019Renaissance Technologies LLCBuy106,6331,877,635$161,007
Q3 2019Renaissance Technologies LLCBuy121,1001,771,002$136,721
Q2 2019Renaissance Technologies LLCBuy18,3001,649,902$117,308
Q1 2019Renaissance Technologies LLCSell-18,1001,631,602$116,708
Q4 2018Renaissance Technologies LLCBuy260,8001,649,702$81,413

Frequently asked questions about CLH activity

  • Which institutional owners are buying CLH?

    Institutional owners buying CLH include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in CLH activity?

    "Buy" means an investor increased their reported position in CLH compared to the prior reporting period. This reflects growing exposure to CLEAN HARBORS INC (CLH) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in CLH increasing?

    Institutional interest in CLH can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.