COMFORT SYSTEMS USA INC (FIX) Stock Institutional Trading Activity


COMFORT SYSTEMS USA INC (FIX) 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 Third Point, Renaissance Technologies LLC, Causeway Capital Management, Sequoia Financial Advisors, and Polen Capital 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 2022Renaissance Technologies LLCSell-7,50032,300$3,717
Q1 2022Third Avenue ManagementSell-9,99042,400$3,775
Q1 2022Renaissance Technologies LLCSell-10,80039,800$3,543
Q4 2021First Eagle U.S. ValueSell-1,5005,366$531
Q3 2021First Eagle U.S. ValueBuy6,7006,866$490
Q3 2021Renaissance Technologies LLCSell-3,77450,600$3,609
Q2 2021First Eagle U.S. ValueBuy166166$13
Q2 2021Renaissance Technologies LLCSell-42,32654,374$4,284
Q1 2021Renaissance Technologies LLCBuy8,80096,700$7,230
Q4 2020Renaissance Technologies LLCSell-7,30087,900$4,629
Q3 2020Third Avenue ManagementSell-91,53552,390$2,699
Q3 2020Renaissance Technologies LLCSell-3,40095,200$4,904
Q2 2020Third Avenue ManagementBuy9,296143,925$5,865
Q2 2020Renaissance Technologies LLCBuy77,00098,600$4,018
Q1 2020Renaissance Technologies LLCSell-105,88021,600$789
Q3 2019Third Avenue ManagementBuy21,499134,629$5,955
Q2 2019Renaissance Technologies LLCSell-283,400127,480$6,500
Q1 2019Renaissance Technologies LLCSell-206,100410,880$21,526
Q4 2018Renaissance Technologies LLCSell-70,020616,980$26,950
Q3 2018Third Avenue ManagementSell-21,567113,130$6,381
Q3 2018Renaissance Technologies LLCBuy19,300687,000$38,747
Q1 2018Renaissance Technologies LLCBuy100667,700$27,543
Q4 2017Third Avenue ManagementSell-34,778134,697$5,880
Q4 2017Renaissance Technologies LLCSell-85,500667,600$29,141
Q3 2017Third Avenue ManagementBuy8,100169,475$6,051
Q3 2017Renaissance Technologies LLCSell-114,992753,100$26,886
Q2 2017Renaissance Technologies LLCBuy90,592868,092$32,206
Q1 2017Renaissance Technologies LLCBuy30,800777,500$28,495
Q4 2016Third Avenue ManagementSell-683161,375$5,374
Q4 2016Renaissance Technologies LLCBuy31,200746,700$24,865

Frequently asked questions about FIX activity

  • Which institutional owners are buying FIX?

    Institutional owners buying FIX 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 FIX activity?

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

  • Is institutional interest in FIX increasing?

    Institutional interest in FIX 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.