COMCAST CORP-CLASS A (CMCSA) Stock Institutional Trading Activity


COMCAST CORP-CLASS A (CMCSA) 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 Eagle Capital Management, Renaissance Technologies LLC, Matrix Advisors Value Fund, Cullen Value Fund, and Yacktman Asset 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
Q1 2021First Eagle U.S. ValueSell-201,28430,181,068$1,633,098
Q1 2021Gardner Russo & QuinnSell-183,6575,531,300$299,299
Q1 2021Longleaf PartnersSell-199,6184,652,977$251,772
Q1 2021Sound Shore ManagementSell-414,2451,666,028$90,149
Q1 2021Tweedy, Browne Co All Funds (US)Sell-3,0851,145,598$61,988
Q4 2020Yacktman Asset ManagementBuy6,4641,506,100$78,920
Q4 2020Torray FundBuy236,746274,626$14,390
Q4 2020Trian Fund ManagementBuy4,229,74619,857,892$1,040,554
Q4 2020Dodge & Cox Stock FundSell-3,403,03380,140,711$4,199,373
Q4 2020Eagle Capital ManagementSell-2,135,64641,943,781$2,197,854
Q4 2020Parnassus Endeavor FundBuy214,48321,650,352$1,134,478
Q4 2020Hillman Value FundSell-5624,229$222
Q4 2020Matrix Private Capital GroupBuy1,6966,200$325
Q4 2020Mairs & Power Growth FundBuy2718,553$448
Q4 2020Sequoia Financial AdvisorsBuy12,493175,017$9,171
Q4 2020Matrix Advisors Value FundSell-266288,597$15,122
Q4 2020Egerton Capital UKSell-443,72410,618,001$556,383
Q4 2020First Eagle U.S. ValueSell-2,037,08930,382,352$1,592,035
Q4 2020Gardner Russo & QuinnBuy764,1345,714,957$299,464
Q4 2020Longleaf PartnersSell-62,2624,852,595$254,276
Q4 2020Sound Shore ManagementSell-317,4982,080,273$109,006
Q4 2020Tweedy, Browne Co All Funds (US)Buy20,4681,148,683$60,191
Q3 2020Yacktman Asset ManagementBuy154,3361,499,636$69,373
Q3 2020Kahn Brothers GroupSell-2,5076,181$285,933
Q3 2020Torray FundBuy37,88037,880$1,752
Q3 2020Trian Fund ManagementBuy15,628,14615,628,146$722,958
Q3 2020Dodge & Cox Stock FundSell-116,94483,543,744$3,864,734
Q3 2020Eagle Capital ManagementSell-2,984,50944,079,427$2,039,114
Q3 2020Parnassus Endeavor FundBuy264,36321,435,869$991,623
Q3 2020Matrix Private Capital GroupSell-3,1244,504$208

Frequently asked questions about CMCSA activity

  • Which institutional owners are buying CMCSA?

    Institutional owners buying CMCSA 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 CMCSA activity?

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

  • Is institutional interest in CMCSA increasing?

    Institutional interest in CMCSA 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.