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 |
|---|---|---|---|---|---|
| RGM Capital, LLC | 0 | $0 | 0.00% | −1,995,460−100.0% | Sold out |
| Viking Global Investors LPSuperinvestorViking Global Investors | 0 | $0 | 0.00% | −1,442,582−100.0% | Sold out |
| Harding Loevner LP | 0 | $0 | 0.00% | −920,272−100.0% | Sold out |
| Kensico Capital Management Corp | 0 | $0 | 0.00% | −901,600−100.0% | Sold out |
| SG Capital Management LLC | 0 | $0 | 0.00% | −811,181−100.0% | Sold out |
| Junto Capital Management LP | 0 | $0 | 0.00% | −615,998−100.0% | Sold out |
| Caisse de Depot Et Placement du Quebec | 0 | $0 | 0.00% | −587,098−100.0% | Sold out |
| ION Fund Management Ltd | 0 | $0 | 0.00% | −461,000−100.0% | Sold out |
| Clearbridge Investments, LLC | 0 | $0 | 0.00% | −382,138−100.0% | Sold out |
| LGT Group Foundation | 0 | $0 | 0.00% | −347,732−100.0% | Sold out |
| Ci Investments Inc. | 0 | $0 | 0.00% | −343,534−100.0% | Sold out |
| Aureus Asset Management, LLC | 0 | $0 | 0.00% | −337,117−100.0% | Sold out |
| Ulysses Management LLC | 0 | $0 | 0.00% | −330,500−100.0% | Sold out |
| Parnassus Investments | 0 | $0 | 0.00% | −272,688−100.0% | Sold out |
| ThornTree Capital Partners LP | 0 | $0 | 0.00% | −242,032−100.0% | Sold out |
| No Street GP LP | 0 | $0 | 0.00% | −239,999−100.0% | Sold out |
| Tran Capital Management, L.P. | 0 | $0 | 0.00% | −233,303−100.0% | Sold out |
| Quantum Capital Management, LLC | 0 | $0 | 0.00% | −218,583−100.0% | Sold out |
| NS Partners Ltd | 0 | $0 | 0.00% | −214,981−100.0% | Sold out |
| Visualize Group LP | 0 | $0 | 0.00% | −214,388−100.0% | Sold out |
| Freestone Grove Partners LP | 0 | $0 | 0.00% | −201,205−100.0% | Sold out |
| Jennison Associates LLC | 0 | $0 | 0.00% | −164,960−100.0% | Sold out |
| Clearline Capital LP | 0 | $0 | 0.00% | −118,041−100.0% | Sold out |
| Fred Alger Management, LLC | 0 | $0 | 0.00% | −112,357−100.0% | Sold out |
| 2Xideas AG | 0 | $0 | 0.00% | −108,267−100.0% | Sold out |
| Kelly Lawrence W & Associates Inc | 0 | $0 | 0.00% | −106,284−100.0% | Sold out |
| Greenvale Capital LLP | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Azimuth Capital Investment Management LLC | 0 | $0 | 0.00% | −94,063−100.0% | Sold out |
| Equitable Trust Co | 0 | $0 | 0.00% | −93,581−100.0% | Sold out |
| Skandinaviska Enskilda Banken AB (publ) | 0 | $0 | 0.00% | −81,263−100.0% | Sold out |
| ING Groep NV | 0 | $0 | 0.00% | −64,844−100.0% | Sold out |
| LGT Fund Management Co Ltd. | 0 | $0 | 0.00% | −50,530−100.0% | Sold out |
| Taikang Asset Management (Hong Kong) Co Ltd | 0 | $0 | 0.00% | −45,969−100.0% | Sold out |
| NFJ Investment Group, LLC | 0 | $0 | 0.00% | −42,415−100.0% | Sold out |
| Oppenheimer & Co Inc | 0 | $0 | 0.00% | −39,791−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −39,225−100.0% | Sold out |
| Katamaran Capital LLP | 0 | $0 | 0.00% | −36,651−100.0% | Sold out |
| Boomfish Wealth Group, LLC | 0 | $0 | 0.00% | −34,474−100.0% | Sold out |
| Allstate Corp | 0 | $0 | 0.00% | −33,862−100.0% | Sold out |
| Delta Global Management LP | 0 | $0 | 0.00% | −31,841−100.0% | Sold out |
| Gateway Investment Advisers LLC | 0 | $0 | 0.00% | −28,779−100.0% | Sold out |
| AG2R la Mondiale Gestion D'Actifs | 0 | $0 | 0.00% | −27,342−100.0% | Sold out |
| Kentucky Retirement Systems | 0 | $0 | 0.00% | −26,218−100.0% | Sold out |
| Virtus Investment Advisers, Inc. | 0 | $0 | 0.00% | −24,381−100.0% | Sold out |
| Twin Tree Management, LP | 0 | $0 | 0.00% | −22,466−100.0% | Sold out |
| First Bank & Trust | 0 | $0 | 0.00% | −20,028−100.0% | Sold out |
| Group One Trading, L.P. | 0 | $0 | 0.00% | −19,737−100.0% | Sold out |
| Maridea Wealth Management LLC | 0 | $0 | 0.00% | −19,393−100.0% | Sold out |
| Dai-Ichi Life Insurance Company, Ltd | 0 | $0 | 0.00% | −17,377−100.0% | Sold out |
| Main Management ETF Advisors, LLC | 0 | $0 | 0.00% | −17,226−100.0% | Sold out |
| Lombard Odier Asset Management (Switzerland) SA | 0 | $0 | 0.00% | −16,820−100.0% | Sold out |
| Elo Mutual Pension Insurance Co | 0 | $0 | 0.00% | −16,684−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −16,042−100.0% | Sold out |
| Kestra Advisory Services, LLC | 0 | $0 | 0.00% | −14,355−100.0% | Sold out |
| Sumitomo Life Insurance Co | 0 | $0 | 0.00% | −14,090−100.0% | Sold out |
| Howard Capital Management Inc. | 0 | $0 | 0.00% | −12,762−100.0% | Sold out |
| Turtle Creek Wealth Advisors, LLC | 0 | $0 | 0.00% | −11,995−100.0% | Sold out |
| Volterra Technologies LP | 0 | $0 | 0.00% | −11,925−100.0% | Sold out |
| Colony Capital, Inc. | 0 | $0 | 0.00% | −11,700−100.0% | Sold out |
| Narwhal Capital Management | 0 | $0 | 0.00% | −11,383−100.0% | Sold out |
| TradeLink Capital LLC | 0 | $0 | 0.00% | −11,356−100.0% | Sold out |
| Odyssean, LLC | 0 | $0 | 0.00% | −11,342−100.0% | Sold out |
| Bleakley Financial Group, LLC | 0 | $0 | 0.00% | −11,242−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −9,729−100.0% | Sold out |
| Inceptionr LLC | 0 | $0 | 0.00% | −9,598−100.0% | Sold out |
| Bridgewater Associates, LP | 0 | $0 | 0.00% | −9,020−100.0% | Sold out |
| Warren Averett Asset Management, LLC | 0 | $0 | 0.00% | −8,948−100.0% | Sold out |
| Fortress Wealth Group, LLC | 0 | $0 | 0.00% | −9,699−100.0% | Sold out |
| Ritholtz Wealth Management | 0 | $0 | 0.00% | −8,369−100.0% | Sold out |
| Michael B. Yongue | 0 | $0 | 0.00% | −7,396−100.0% | Sold out |
| First Manhattan Co | 0 | $0 | 0.00% | −6,847−100.0% | Sold out |
| Buckhead Capital Management LLC | 0 | $0 | 0.00% | −6,810−100.0% | Sold out |
| Private Advisor Group, LLC | 0 | $0 | 0.00% | −6,686−100.0% | Sold out |
| Hilltop Holdings Inc. | 0 | $0 | 0.00% | −6,507−100.0% | Sold out |
| LRT Capital Management, LLC | 0 | $0 | 0.00% | −6,247−100.0% | Sold out |
| Oarsman Capital, Inc. | 0 | $0 | 0.00% | −6,002−100.0% | Sold out |
| Birch Financial Group, LLC | 0 | $0 | 0.00% | −5,988−100.0% | Sold out |
| Wedbush Securities Inc | 0 | $0 | 0.00% | −5,905−100.0% | Sold out |
| Argos Wealth Advisors, LLC | 0 | $0 | 0.00% | −5,608−100.0% | Sold out |
| Kovitz Investment Group Partners, LLC | 0 | $0 | 0.00% | −5,488−100.0% | Sold out |
| IVC Wealth Advisors LLC | 0 | $0 | 0.00% | −5,464−100.0% | Sold out |
| Strait & Sound Wealth Management LLC | 0 | $0 | 0.00% | −5,274−100.0% | Sold out |
| Forum Financial Management, LP | 0 | $0 | 0.00% | −5,051−100.0% | Sold out |
| Howard Bailey Securities, LLC | 0 | $0 | 0.00% | −5,031−100.0% | Sold out |
| Adviser Investments LLC | 0 | $0 | 0.00% | −4,590−100.0% | Sold out |
| Chatham Capital Group, Inc. | 0 | $0 | 0.00% | −4,456−100.0% | Sold out |
| Brown Miller Wealth Management, LLC | 0 | $0 | 0.00% | −4,444−100.0% | Sold out |
| One Wealth Capital Management, LLC | 0 | $0 | 0.00% | −4,438−100.0% | Sold out |
| Journey Retirement Planning & Investment Management LLC | 0 | $0 | 0.00% | −4,314−100.0% | Sold out |
| Moran Wealth Management, LLC | 0 | $0 | 0.00% | −4,298−100.0% | Sold out |
| Apriem Advisors | 0 | $0 | 0.00% | −4,208−100.0% | Sold out |
| Mount Yale Investment Advisors, LLC | 0 | $0 | 0.00% | −4,181−100.0% | Sold out |
| CCG Wealth Management, LLC | 0 | $0 | 0.00% | −4,171−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −4,140−100.0% | Sold out |
| Cigna Investments Inc | 0 | $0 | 0.00% | −4,135−100.0% | Sold out |
| Flputnam Investment Management Co | 0 | $0 | 0.00% | −4,069−100.0% | Sold out |
| Aprio Wealth Management, LLC | 0 | $0 | 0.00% | −4,068−100.0% | Sold out |
| PCM Encore, LLC | 0 | $0 | 0.00% | −3,990−100.0% | Sold out |
| Citizens Financial Group Inc | 0 | $0 | 0.00% | −3,967−100.0% | Sold out |
| Bell Bank | 0 | $0 | 0.00% | −3,962−100.0% | Sold out |