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
Q3 2018Renaissance Technologies LLCBuy156,2001,388,902$99,418
Q2 2018Turtle Creek Asset ManagementSell-12,70022,350$1,242
Q1 2018Turtle Creek Asset ManagementBuy5,00035,050$1,711
Q1 2018Renaissance Technologies LLCBuy35,6001,232,702$60,168
Q4 2017Turtle Creek Asset ManagementBuy6,45030,050$1,629
Q4 2017Renaissance Technologies LLCBuy217,1021,197,102$64,883
Q3 2017Turtle Creek Asset ManagementBuy80023,600$1,338
Q3 2017Renaissance Technologies LLCBuy3,698980,000$55,566
Q2 2017Turtle Creek Asset ManagementSell-240,95422,800$1,273
Q2 2017Renaissance Technologies LLCSell-114,700976,302$54,507
Q1 2017Turtle Creek Asset ManagementBuy44,400263,754$14,670
Q1 2017Renaissance Technologies LLCBuy175,6021,091,002$60,682
Q4 2016Turtle Creek Asset ManagementSell-330,286219,354$12,207
Q4 2016Renaissance Technologies LLCBuy132,200915,400$50,942
Q3 2016Turtle Creek Asset ManagementBuy76,400549,640$26,372
Q3 2016Renaissance Technologies LLCBuy105,400783,200$37,578
Q2 2016Turtle Creek Asset ManagementBuy18,896473,240$24,661
Q2 2016Renaissance Technologies LLCBuy90,298677,800$35,320
Q1 2016Turtle Creek Asset ManagementBuy1,600454,344$22,417
Q1 2016Renaissance Technologies LLCBuy14,612587,502$28,987
Q4 2015Turtle Creek Asset ManagementBuy74,000452,744$18,857
Q4 2015Renaissance Technologies LLCBuy453,817572,890$23,861
Q3 2015Renaissance Technologies LLCBuy43,371119,073$5,236
Q3 2015Turtle Creek Asset ManagementBuy107,400378,744$16,653
Q2 2015Renaissance Technologies LLCSell-36,80075,702$4,068
Q2 2015Turtle Creek Asset ManagementBuy25,100271,344$14,582
Q1 2015Third Avenue ManagementSell-35,39278,715$4,469
Q1 2015Renaissance Technologies LLCSell-101,000112,502$6,388
Q1 2015Turtle Creek Asset ManagementSell-37,400246,244$13,982
Q4 2014Third Avenue ManagementBuy24114,107$5,483

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.