Costar Group, Inc.
CSGP- Exchange
- Nasdaq
- Industry
- Services-Business Services, NEC
- SEC CIK
- 0001057352
In the last 90 days, Costar Group, Inc. insiders filed 1 open-market purchase and 2 sales; 760 institutions reported holding it in 13F filings for Q2 2026, worth $12.3B in total; superinvestors Akre Capital Management and Weitz Investment Management hold it.
13F holders, Q1 2026
Institutional positions in Costar Group, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 797
- −36 vs. Q4 2025
- Shares held
- 415.9M
- +62.8M (+17.8%) vs. Q4 2025
- Total value
- $16.8B
- −$6.95B (−29.3%) vs. Q4 2025
- New holders
- 130
- 307 more added
- Sold out
- 166
- 277 more reduced
14 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting CSGP on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 760 | $12.3B |
| Q1 2026 | 797 | $16.8B |
| Q4 2025 | 847 | $28.6B |
| Q3 2025 | 905 | $35.1B |
| Q2 2025 | 873 | $34.3B |
| Q1 2025 | 858 | $34.0B |
| Q4 2024 | 805 | $29.3B |
| Q3 2024 | 773 | $30.2B |
| Q2 2024 | 767 | $29.4B |
| Q1 2024 | 767 | $40.1B |
| Q4 2023 | 737 | $34.7B |
| Q3 2023 | 690 | $30.1B |
| Q2 2023 | 714 | $35.6B |
| Q1 2023 | 692 | $27.0B |
| Q4 2022 | 704 | $30.5B |
| Q3 2022 | 634 | $29.1B |
| Q2 2022 | 591 | $23.2B |
| Q1 2022 | 589 | $25.2B |
| Q4 2021 | 633 | $30.2B |
| Q3 2021 | 594 | $32.3B |
| Q2 2021 | 607 | $31.1B |
| Q1 2021 | 593 | $31.2B |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Costar Group, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vanguard Portfolio Management LLC | 38,234,133 | $1.54B | 0.08% | +38,234,133 | New |
| BlackRock, Inc. | 33,808,184 | $1.36B | 0.02% | −162,442−0.5% | Reduced |
| Vanguard Capital Management LLC | 27,423,903 | $1.11B | 0.03% | +27,423,903 | New |
| State Street Corp | 18,650,975 | $752.4M | 0.03% | +18,623+0.1% | Added |
| Principal Financial Group Inc | 17,696,192 | $713.9M | 0.38% | +130,118+0.7% | Added |
| Bamco Inc | 16,314,175 | $658.1M | 1.99% | −3,183,924−16.3% | Reduced |
| Invesco Ltd. | 15,947,525 | $643.3M | 0.06% | +1,038,784+7.0% | Added |
| Capital International Investors | 15,513,753 | $625.8M | 0.15% | +4,671,743+43.1% | Added |
| Baillie Gifford & Co | 13,610,922 | $549.1M | 0.56% | +677,737+5.2% | Added |
| Polen Capital Management LLC | 12,570,368 | $507.1M | 3.51% | +7,679,432+157.0% | Added |
| Geode Capital Management, LLC | 12,448,652 | $500.4M | 0.03% | +266,485+2.2% | Added |
| Akre Capital Management LLCSuperinvestorAkre Capital Management | 10,348,273 | $417.4M | 6.83% | +730,468+7.6% | Added |
| Goldman Sachs Group Inc | 9,245,812 | $373.0M | 0.05% | +5,494,284+146.5% | Added |
| Janus Henderson Group PLC | 7,724,152 | $311.6M | 0.15% | +250,772+3.4% | Added |
| D. E. Shaw & Co., Inc. | 5,909,623 | $238.4M | 0.19% | +5,004,135+552.6% | Added |
| Morgan Stanley | 5,412,615 | $218.3M | 0.01% | +121,479+2.3% | Added |
| Capital Research Global Investors | 4,373,706 | $176.4M | 0.03% | −1,193,256−21.4% | Reduced |
| Bank of America Corp | 3,568,107 | $143.9M | 0.01% | +63,295+1.8% | Added |
| Van Eck Associates Corp | 3,478,726 | $140.3M | 0.11% | +3,422,202+6,054.4% | Added |
| Northern Trust Corp | 3,432,231 | $138.5M | 0.02% | −33,831−1.0% | Reduced |
| Meritage Group LP | 3,329,006 | $134.3M | 5.07% | +3,329,006 | New |
| Amundi | 3,280,724 | $132.3M | 0.04% | −833,792−20.3% | Reduced |
| Legal & General Group Plc | 3,025,508 | $122.0M | 0.03% | +164,208+5.7% | Added |
| Beck Mack & Oliver LLC | 2,926,975 | $118.1M | 2.43% | +702,086+31.6% | Added |
| Charles Schwab Investment Management Inc | 2,874,262 | $115.9M | 0.02% | +211,163+7.9% | Added |
| FMR LLC | 2,831,524 | $114.2M | 0.01% | +1,629,371+135.5% | Added |
| Ensign Peak Advisors, Inc | 2,734,289 | $110.3M | 0.21% | +2,155,933+372.8% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 2,675,501 | $107.9M | 0.13% | −137,862−4.9% | Reduced |
| Bank of Montreal | 2,487,715 | $100.4M | 0.04% | +2,033,747+448.0% | Added |
| UBS Asset Management Americas Inc | 2,425,693 | $97.9M | 0.02% | −7,124−0.3% | Reduced |
| Dimensional Fund Advisors LP | 2,401,852 | $96.9M | 0.02% | +82,098+3.5% | Added |
| Bank of New York Mellon Corp | 2,400,680 | $96.8M | 0.02% | −1,712,322−41.6% | Reduced |
| Vanguard Fiduciary Trust Co | 2,391,061 | $96.5M | 0.02% | +2,391,061 | New |
| Nomura Asset Management International Inc. | 2,333,765 | $94.1M | 0.16% | −1,575,396−40.3% | Reduced |
| Canada Pension Plan Investment Board | 2,010,963 | $81.1M | 0.05% | +1,269,560+171.2% | Added |
| Nuveen, LLC | 1,930,808 | $77.9M | 0.02% | −1,630,088−45.8% | Reduced |
| Deutsche Bank AG | 1,899,502 | $76.6M | 0.03% | +123,699+7.0% | Added |
| JPMorgan Chase & Co | 1,849,545 | $75.6M | 0.01% | +1,077,505+139.6% | Added |
| Envestnet Asset Management Inc | 1,802,537 | $72.7M | 0.02% | +466,685+34.9% | Added |
| Mackenzie Financial Corp | 1,638,673 | $66.1M | 0.08% | −22,042−1.3% | Reduced |
| DF Dent & Co Inc | 1,605,157 | $64.8M | 1.24% | −402,473−20.0% | Reduced |
| Price T Rowe Associates Inc | 1,517,795 | $61.2M | 0.01% | +318,963+26.6% | Added |
| Tremblant Capital Group | 1,506,031 | $60.8M | 1.96% | −129,933−7.9% | Reduced |
| Tiger Global Management LLCSuperinvestorTiger Global Management | 1,500,000 | $60.5M | 0.26% | −759,109−33.6% | Reduced |
| Royal Bank of Canada | 1,435,734 | $57.9M | 0.01% | +127,792+9.8% | Added |
| Wells Fargo & Company | 1,402,376 | $56.6M | 0.01% | +521,404+59.2% | Added |
| Greenhouse Funds LLLP | 1,377,305 | $55.6M | 2.63% | +1,377,305 | New |
| Pictet Asset Management Holding SA | 1,372,159 | $55.4M | 0.06% | +316,651+30.0% | Added |
| Capitolis Liquid Global Markets LLC | 1,355,000 | $54.7M | 0.35% | +1,355,000 | New |
| HSBC Holdings PLC | 1,346,906 | $54.4M | 0.03% | −627,634−31.8% | Reduced |
| Voloridge Investment Management, LLC | 1,329,958 | $53.7M | 0.21% | +1,329,958 | New |
| UBS Group AG | 1,326,028 | $53.5M | 0.01% | −785,262−37.2% | Reduced |
| Federated Hermes, Inc. | 1,297,958 | $52.4M | 0.09% | −25,041−1.9% | Reduced |
| AQR Capital Management LLC | 1,262,704 | $50.9M | 0.02% | +893,352+241.9% | Added |
| Swiss National Bank | 1,243,765 | $50.2M | 0.03% | +82,800+7.1% | Added |
| Barclays PLC | 1,232,021 | $49.7M | 0.02% | −1,089,679−46.9% | Reduced |
| Riverbridge Partners LLC | 1,227,391 | $49.5M | 1.21% | −225,155−15.5% | Reduced |
| Spyglass Capital Management LLC | 1,111,224 | $44.8M | 3.17% | −467,225−29.6% | Reduced |
| Citadel Advisors LLC | 1,088,204 | $43.9M | 0.03% | +483,661+80.0% | Added |
| Jane Street Group, LLC | 1,087,447 | $43.9M | 0.05% | +850,071+358.1% | Added |
| Chicago Capital, LLC | 1,055,620 | $42.6M | 1.15% | +228,497+27.6% | Added |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 1,051,841 | $42.4M | 0.03% | −5,343−0.5% | Reduced |
| Massachusetts Financial Services Co | 956,096 | $39.2M | 0.01% | −2,203,829−69.7% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 954,074 | $38.5M | 0.02% | −45,610−4.6% | Reduced |
| Citigroup Inc | 953,620 | $38.5M | 0.02% | −548,401−36.5% | Reduced |
| Vanguard Global Advisers, LLC | 928,271 | $37.4M | 0.02% | +928,271 | New |
| Colony Group, LLC | 922,118 | $37.2M | 0.04% | +81,003+9.6% | Added |
| Blair William & Co | 900,313 | $36.3M | 0.10% | −1,123,210−55.5% | Reduced |
| Stephens Investment Management Group LLC | 872,463 | $35.2M | 0.48% | −242,509−21.8% | Reduced |
| Corvex Management LP | 851,734 | $34.4M | 1.37% | +851,734 | New |
| First Trust Advisors LP | 839,044 | $33.8M | 0.02% | +135,686+19.3% | Added |
| American Capital Management Inc | 825,296 | $33.3M | 1.79% | −440.0% | Reduced |
| Douglas Lane & Associates, LLC | 803,839 | $32.4M | 0.47% | +120,778+17.7% | Added |
| Primecap Management Co | 803,600 | $32.4M | 0.03% | +652,600+432.2% | Added |
| TimesSquare Capital Management, LLC | 795,580 | $32.1M | 0.54% | −13,741−1.7% | Reduced |
| Rhumbline Advisers | 792,763 | $32.0M | 0.03% | +23,928+3.1% | Added |
| Squarepoint Ops LLC | 782,607 | $31.6M | 0.07% | −12,956−1.6% | Reduced |
| BNP Paribas Arbitrage, SA | 768,716 | $31.0M | 0.02% | −229,097−23.0% | Reduced |
| Petrus Trust Company, LTA | 756,200 | $30.5M | 3.33% | +127,002+20.2% | Added |
| Vanguard Asset Management, Ltd | 717,670 | $29.0M | 0.02% | +717,670 | New |
| NZS Capital, LLC | 709,426 | $28.6M | 0.95% | +268,064+60.7% | Added |
| National Pension Service | 702,678 | $28.3M | 0.02% | +20,559+3.0% | Added |
| Peregrine Capital Management LLC | 699,152 | $28.2M | 1.05% | −49,721−6.6% | Reduced |
| Ameriprise Financial Inc | 687,776 | $27.7M | 0.01% | +72,738+11.8% | Added |
| Alliancebernstein L.P. | 407,508 | $27.4M | 0.01% | −14,665−3.5% | Reduced |
| California State Teachers Retirement System | 667,111 | $26.9M | 0.03% | −15,527−2.3% | Reduced |
| Ardmore Road Asset Management LP | 666,900 | $26.9M | 1.77% | +666,900 | New |
| Raymond James Financial Inc | 628,583 | $25.4M | 0.01% | +119,216+23.4% | Added |
| Thompson Siegel & Walmsley LLC | 615,251 | $24.8M | 0.44% | +615,251 | New |
| ProShare Advisors LLC | 611,283 | $24.7M | 0.04% | −142,389−18.9% | Reduced |
| Walleye Capital LLC | 536,787 | $21.7M | 0.13% | +504,325+1,553.6% | Added |
| California Public Employees Retirement System | 532,683 | $21.5M | 0.01% | −199,288−27.2% | Reduced |
| Marshall Wace, LLP | 517,260 | $20.9M | 0.02% | +125,955+32.2% | Added |
| Weitz Investment Management, Inc.SuperinvestorWeitz Investment Management | 517,025 | $20.9M | 1.46% | −202,825−28.2% | Reduced |
| Prana Capital Management, LP | 515,387 | $20.8M | 0.64% | +198,527+62.7% | Added |
| CIBC Bancorp USA Inc. | 500,113 | $20.2M | 0.03% | +500,113 | New |
| Weiss Asset Management LP | 497,500 | $20.1M | 0.37% | +463,180+1,349.6% | Added |
| Northwood Liquid Management LP | 483,200 | $19.5M | 1.31% | +483,200 | New |
| Fiera Capital Corp | 481,711 | $19.4M | 0.07% | +130,781+37.3% | Added |
| Erste Asset Management GmbH | 450,000 | $18.4M | 0.17% | +130,000+40.6% | Added |