COSTAR GROUP INC (CSGP) Stock Institutional Trading Activity


COSTAR GROUP INC (CSGP) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q1 2026), investors with some of the largest reported share count changes include Sequoia Financial Advisors, Polen Capital Management, Tiger Global Management, Vulcan Value Partners, and Viking Global Investors. 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 2020Viking Global InvestorsBuy300,146300,146$254,677
Q3 2020Vulcan Value PartnersBuy458,447458,447$388,997
Q3 2020Akre Capital ManagementBuy3,440958,793$813,545
Q2 2020Bares Capital ManagementSell-5,601371,810$264,234
Q2 2020Parnassus Endeavor FundBuy39,58639,586$28,133
Q2 2020Renaissance Technologies LLCBuy36,69846,598$33,116
Q2 2020Akre Capital ManagementBuy517,041955,353$678,941
Q2 2020Disciplined Growth InvestorsSell-47410,174$7,230
Q1 2020Bares Capital ManagementBuy10,000377,411$221,620
Q1 2020Renaissance Technologies LLCBuy369,900$5,813
Q1 2020Akre Capital ManagementBuy188,312438,312$257,381
Q1 2020Disciplined Growth InvestorsSell-9,96610,648$6,253
Q4 2019Bares Capital ManagementBuy4,257367,411$219,822
Q4 2019Akre Capital ManagementBuy250,000250,000$149,575
Q4 2019Disciplined Growth InvestorsSell-10220,614$12,333
Q3 2019Bares Capital ManagementSell-171,596363,154$215,423
Q3 2019Disciplined Growth InvestorsSell-520,716$12,289
Q2 2019Bares Capital ManagementSell-16,347534,750$296,284
Q2 2019Disciplined Growth InvestorsSell-32920,721$11,481
Q1 2019Bares Capital ManagementSell-40,336551,097$257,043
Q1 2019Renaissance Technologies LLCSell-49,0349,864$4,601
Q1 2019Disciplined Growth InvestorsBuy10221,050$9,818
Q4 2018Bares Capital ManagementBuy26,785591,433$199,514
Q4 2018Renaissance Technologies LLCSell-100,10058,898$19,869
Q4 2018Disciplined Growth InvestorsSell-20620,948$7,067
Q3 2018Bares Capital ManagementSell-63,132564,648$237,626
Q3 2018Renaissance Technologies LLCSell-50,600158,998$66,913
Q3 2018Disciplined Growth InvestorsSell-18,34821,154$8,902
Q2 2018Bares Capital ManagementBuy5,223627,780$259,041
Q2 2018Disciplined Growth InvestorsSell-7039,502$16,300

Frequently asked questions about CSGP activity

  • Which institutional owners are buying CSGP?

    Institutional owners buying CSGP 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 CSGP activity?

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

  • Is institutional interest in CSGP increasing?

    Institutional interest in CSGP 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.