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 $11.7B 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
- −34 vs. Q4 2025
- Shares held
- 415.9M
- +73.3M (+21.4%) vs. Q4 2025
- Total value
- $16.8B
- −$6.24B (−27.1%) vs. Q4 2025
- New holders
- 130
- 308 more added
- Sold out
- 164
- 276 more reduced
16 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 | $11.7B |
| Q1 2026 | 797 | $16.8B |
| Q4 2025 | 847 | $28.4B |
| Q3 2025 | 905 | $34.9B |
| Q2 2025 | 873 | $34.2B |
| Q1 2025 | 858 | $33.9B |
| Q4 2024 | 805 | $28.9B |
| Q3 2024 | 773 | $30.0B |
| Q2 2024 | 767 | $29.3B |
| Q1 2024 | 767 | $38.4B |
| Q4 2023 | 737 | $34.4B |
| Q3 2023 | 690 | $30.1B |
| Q2 2023 | 714 | $35.5B |
| Q1 2023 | 692 | $26.7B |
| Q4 2022 | 704 | $30.4B |
| Q3 2022 | 634 | $28.0B |
| Q2 2022 | 591 | $23.0B |
| Q1 2022 | 589 | $25.2B |
| Q4 2021 | 633 | $29.6B |
| 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 |
|---|---|---|---|---|---|
| Weiss Asset Management LP | 497,500 | $20.1M | 0.37% | +463,180+1,349.6% | Added |
| CIBC Bancorp USA Inc. | 500,113 | $20.2M | 0.03% | +500,113 | New |
| Prana Capital Management, LP | 515,387 | $20.8M | 0.64% | +198,527+62.7% | Added |
| Weitz Investment Management, Inc.SuperinvestorWeitz Investment Management | 517,025 | $20.9M | 1.46% | −202,825−28.2% | Reduced |
| Marshall Wace, LLP | 517,260 | $20.9M | 0.02% | +125,955+32.2% | Added |
| California Public Employees Retirement System | 532,683 | $21.5M | 0.01% | −199,288−27.2% | Reduced |
| Walleye Capital LLC | 536,787 | $21.7M | 0.13% | +504,325+1,553.6% | Added |
| ProShare Advisors LLC | 611,283 | $24.7M | 0.04% | −142,389−18.9% | Reduced |
| Thompson Siegel & Walmsley LLC | 615,251 | $24.8M | 0.44% | +615,251 | New |
| Raymond James Financial Inc | 628,583 | $25.4M | 0.01% | +119,216+23.4% | Added |
| Ardmore Road Asset Management LP | 666,900 | $26.9M | 1.77% | +666,900 | New |
| California State Teachers Retirement System | 667,111 | $26.9M | 0.03% | −15,527−2.3% | Reduced |
| Alliancebernstein L.P. | 407,508 | $27.4M | 0.01% | −14,665−3.5% | Reduced |
| Ameriprise Financial Inc | 687,776 | $27.7M | 0.01% | +72,738+11.8% | Added |
| Peregrine Capital Management LLC | 699,152 | $28.2M | 1.05% | −49,721−6.6% | Reduced |
| National Pension Service | 702,678 | $28.3M | 0.02% | +20,559+3.0% | Added |
| NZS Capital, LLC | 709,426 | $28.6M | 0.95% | +268,064+60.7% | Added |
| Vanguard Asset Management, Ltd | 717,670 | $29.0M | 0.02% | +717,670 | New |
| Petrus Trust Company, LTA | 756,200 | $30.5M | 3.33% | +127,002+20.2% | Added |
| BNP Paribas Arbitrage, SA | 768,716 | $31.0M | 0.02% | −229,097−23.0% | Reduced |
| Squarepoint Ops LLC | 782,607 | $31.6M | 0.07% | −12,956−1.6% | Reduced |
| Rhumbline Advisers | 792,763 | $32.0M | 0.03% | +23,928+3.1% | Added |
| TimesSquare Capital Management, LLC | 795,580 | $32.1M | 0.54% | −13,741−1.7% | Reduced |
| Primecap Management Co | 803,600 | $32.4M | 0.03% | +652,600+432.2% | Added |
| Douglas Lane & Associates, LLC | 803,839 | $32.4M | 0.47% | +120,778+17.7% | Added |
| American Capital Management Inc | 825,296 | $33.3M | 1.79% | −440.0% | Reduced |
| First Trust Advisors LP | 839,044 | $33.8M | 0.02% | +135,686+19.3% | Added |
| Corvex Management LP | 851,734 | $34.4M | 1.37% | +851,734 | New |
| Stephens Investment Management Group LLC | 872,463 | $35.2M | 0.48% | −242,509−21.8% | Reduced |
| Blair William & Co | 900,313 | $36.3M | 0.10% | −1,123,210−55.5% | Reduced |
| Colony Group, LLC | 922,118 | $37.2M | 0.04% | +81,003+9.6% | Added |
| Vanguard Global Advisers, LLC | 928,271 | $37.4M | 0.02% | +928,271 | New |
| Citigroup Inc | 953,620 | $38.5M | 0.02% | −548,401−36.5% | Reduced |
| Sumitomo Mitsui Trust Holdings, Inc. | 954,074 | $38.5M | 0.02% | −45,610−4.6% | Reduced |
| Massachusetts Financial Services Co | 956,096 | $39.2M | 0.01% | −2,203,829−69.7% | Reduced |
| Mitsubishi UFJ Kokusai Asset Management Co., Ltd. | 1,051,841 | $42.4M | 0.03% | −5,343−0.5% | Reduced |
| Chicago Capital, LLC | 1,055,620 | $42.6M | 1.15% | +228,497+27.6% | Added |
| Jane Street Group, LLC | 1,087,447 | $43.9M | 0.05% | +850,071+358.1% | Added |
| Citadel Advisors LLC | 1,088,204 | $43.9M | 0.03% | +483,661+80.0% | Added |
| Spyglass Capital Management LLC | 1,111,224 | $44.8M | 3.17% | −467,225−29.6% | Reduced |
| Riverbridge Partners LLC | 1,227,391 | $49.5M | 1.21% | −225,155−15.5% | Reduced |
| Barclays PLC | 1,232,021 | $49.7M | 0.02% | −1,089,679−46.9% | Reduced |
| Swiss National Bank | 1,243,765 | $50.2M | 0.03% | +82,800+7.1% | Added |
| AQR Capital Management LLC | 1,262,704 | $50.9M | 0.02% | +893,352+241.9% | Added |
| Federated Hermes, Inc. | 1,297,958 | $52.4M | 0.09% | −25,041−1.9% | Reduced |
| UBS Group AG | 1,326,028 | $53.5M | 0.01% | −785,262−37.2% | Reduced |
| Voloridge Investment Management, LLC | 1,329,958 | $53.7M | 0.21% | +1,329,958 | New |
| HSBC Holdings PLC | 1,346,906 | $54.4M | 0.03% | +359,636+36.4% | Added |
| Capitolis Liquid Global Markets LLC | 1,355,000 | $54.7M | 0.35% | +1,355,000 | New |
| Pictet Asset Management Holding SA | 1,372,159 | $55.4M | 0.06% | +316,651+30.0% | Added |
| Greenhouse Funds LLLP | 1,377,305 | $55.6M | 2.63% | +1,377,305 | New |
| Wells Fargo & Company | 1,402,376 | $56.6M | 0.01% | +521,404+59.2% | Added |
| Royal Bank of Canada | 1,435,734 | $57.9M | 0.01% | +127,792+9.8% | Added |
| Tiger Global Management LLCSuperinvestorTiger Global Management | 1,500,000 | $60.5M | 0.26% | −759,109−33.6% | Reduced |
| Tremblant Capital Group | 1,506,031 | $60.8M | 1.96% | −129,933−7.9% | Reduced |
| Price T Rowe Associates Inc | 1,517,795 | $61.2M | 0.01% | +318,963+26.6% | Added |
| DF Dent & Co Inc | 1,605,157 | $64.8M | 1.24% | −402,473−20.0% | Reduced |
| Mackenzie Financial Corp | 1,638,673 | $66.1M | 0.08% | −22,042−1.3% | Reduced |
| Envestnet Asset Management Inc | 1,802,537 | $72.7M | 0.02% | +466,685+34.9% | Added |
| JPMorgan Chase & Co | 1,849,545 | $75.6M | 0.01% | +1,077,505+139.6% | Added |
| Deutsche Bank AG | 1,899,502 | $76.6M | 0.03% | +123,699+7.0% | Added |
| Nuveen, LLC | 1,930,808 | $77.9M | 0.02% | −1,630,088−45.8% | Reduced |
| Canada Pension Plan Investment Board | 2,010,963 | $81.1M | 0.05% | +1,269,560+171.2% | Added |
| Nomura Asset Management International Inc. | 2,333,765 | $94.1M | 0.16% | −1,575,396−40.3% | Reduced |
| Vanguard Fiduciary Trust Co | 2,391,061 | $96.5M | 0.02% | +2,391,061 | New |
| Bank of New York Mellon Corp | 2,400,680 | $96.8M | 0.02% | −1,712,322−41.6% | Reduced |
| Dimensional Fund Advisors LP | 2,401,852 | $96.9M | 0.02% | +82,098+3.5% | Added |
| UBS Asset Management Americas Inc | 2,425,693 | $97.9M | 0.02% | −7,124−0.3% | Reduced |
| Bank of Montreal | 2,487,715 | $100.4M | 0.04% | +2,033,747+448.0% | Added |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 2,675,501 | $107.9M | 0.13% | −137,862−4.9% | Reduced |
| Ensign Peak Advisors, Inc | 2,734,289 | $110.3M | 0.21% | +2,155,933+372.8% | Added |
| FMR LLC | 2,831,524 | $114.2M | 0.01% | +1,629,371+135.5% | Added |
| Charles Schwab Investment Management Inc | 2,874,262 | $115.9M | 0.02% | +211,163+7.9% | Added |
| Beck Mack & Oliver LLC | 2,926,975 | $118.1M | 2.43% | +702,086+31.6% | Added |
| Legal & General Group Plc | 3,025,508 | $122.0M | 0.03% | +164,208+5.7% | Added |
| Amundi | 3,280,724 | $132.3M | 0.04% | −833,792−20.3% | Reduced |
| Meritage Group LP | 3,329,006 | $134.3M | 5.07% | +3,329,006 | New |
| Northern Trust Corp | 3,432,231 | $138.5M | 0.02% | −33,831−1.0% | Reduced |
| Van Eck Associates Corp | 3,478,726 | $140.3M | 0.11% | +3,422,202+6,054.4% | Added |
| Bank of America Corp | 3,568,107 | $143.9M | 0.01% | +63,295+1.8% | Added |
| Capital Research Global Investors | 4,373,706 | $176.4M | 0.03% | −1,193,256−21.4% | Reduced |
| Morgan Stanley | 5,412,615 | $218.3M | 0.01% | +121,479+2.3% | Added |
| D. E. Shaw & Co., Inc. | 5,909,623 | $238.4M | 0.19% | +5,004,135+552.6% | Added |
| Janus Henderson Group PLC | 7,724,152 | $311.6M | 0.15% | +250,772+3.4% | Added |
| Goldman Sachs Group Inc | 9,245,812 | $373.0M | 0.05% | +5,494,284+146.5% | Added |
| Akre Capital Management LLCSuperinvestorAkre Capital Management | 10,348,273 | $417.4M | 6.83% | +730,468+7.6% | Added |
| Geode Capital Management, LLC | 12,448,652 | $500.4M | 0.03% | +266,485+2.2% | Added |
| Polen Capital Management LLC | 12,570,368 | $507.1M | 3.51% | +7,679,432+157.0% | Added |
| Baillie Gifford & Co | 13,610,922 | $549.1M | 0.56% | +677,737+5.2% | Added |
| Capital International Investors | 15,513,753 | $625.8M | 0.15% | +4,671,743+43.1% | Added |
| Invesco Ltd. | 15,947,525 | $643.3M | 0.06% | +1,038,784+7.0% | Added |
| Bamco Inc | 16,314,175 | $658.1M | 1.99% | −3,183,924−16.3% | Reduced |
| Principal Financial Group Inc | 17,696,192 | $713.9M | 0.38% | +130,118+0.7% | Added |
| State Street Corp | 18,650,975 | $752.4M | 0.03% | +18,623+0.1% | Added |
| Vanguard Capital Management LLC | 27,423,903 | $1.11B | 0.03% | +27,423,903 | New |
| BlackRock, Inc. | 33,808,184 | $1.36B | 0.02% | −162,442−0.5% | Reduced |
| Vanguard Portfolio Management LLC | 38,234,133 | $1.54B | 0.08% | +38,234,133 | New |
| Vulcan Value Partners, LLC | 0 | $0 | 0.00% | −4,485,021−100.0% | Sold out |
| T. Rowe Price Investment Management, Inc. | 0 | $0 | 0.00% | −3,464,794−100.0% | Sold out |
| Third Point LLCSuperinvestorThird Point | 0 | $0 | 0.00% | −3,165,000−100.0% | Sold out |