COSTAR GROUP INC (CSGP) Institutional Ownership Changes & 13F Activity

COSTAR GROUP INC (CSGP) institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Polen Capital Management, Meritage Group, Tiger Global Management, Akre Capital Management, and ShawSpring Partners.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2020Viking Global InvestorsSell-229,19770,949$65,577
Q4 2020Vulcan Value PartnersBuy38,864497,311$459,655
Q4 2020Renaissance Technologies LLCSell-25,91814,080$13,014
Q4 2020Bares Capital ManagementSell-22,211346,053$319,850
Q4 2020Akre Capital ManagementBuy7,168965,961$892,818
Q3 2020Vulcan Value PartnersBuy458,447458,447$388,997
Q3 2020Viking Global InvestorsBuy300,146300,146$254,677
Q3 2020Renaissance Technologies LLCSell-6,60039,998$33,939
Q3 2020Bares Capital ManagementSell-3,546368,264$312,476
Q3 2020Akre Capital ManagementBuy3,440958,793$813,545
Q3 2020Parnassus Endeavor FundSell-88638,700$32,837
Q2 2020Akre Capital ManagementBuy517,041955,353$678,941
Q2 2020Parnassus Endeavor FundBuy39,58639,586$28,133
Q2 2020Renaissance Technologies LLCBuy36,69846,598$33,116
Q2 2020Bares Capital ManagementSell-5,601371,810$264,234
Q2 2020Disciplined Growth InvestorsSell-47410,174$7,230
Q1 2020Akre Capital ManagementBuy188,312438,312$257,381
Q1 2020Bares Capital ManagementBuy10,000377,411$221,620
Q1 2020Disciplined Growth InvestorsSell-9,96610,648$6,253
Q1 2020Renaissance Technologies LLCBuy369,900$5,813
Q4 2019Akre Capital ManagementBuy250,000250,000$149,575
Q4 2019Bares Capital ManagementBuy4,257367,411$219,822
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 2019Renaissance Technologies LLCSell-49,0349,864$4,601
Q1 2019Bares Capital ManagementSell-40,336551,097$257,043
Q1 2019Disciplined Growth InvestorsBuy10221,050$9,818

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.

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