Costar Group, Inc.

CSGP

Exchange: Nasdaq
Industry: Services-Business Services, NEC
SEC CIK: 0001057352

SEC filings (opens in a new tab)

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, Q3 2026

Institutional positions in Costar Group, Inc. as of Sep 30, 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

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 5; −1 vs. Q2 2026
Shares held: 11.3K; −1.94K (−14.6%) vs. Q2 2026
Total value: $310.0K; −$65.5K (−17.4%) vs. Q2 2026
New holders: 0; 3 more added
Sold out: 1; 1 more reduced

754 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: 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.

Institutional holders

Value held

Institutions holding CSGP and their total value by quarter
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, Q3 2026

Shares, value and share of portfolio for each institution holding Costar Group, Inc.; share changes are against Q2 2026.

Institutions holding CSGP in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
United Asset Strategies, Inc.	–	–	–	–	Not filed
New York State Common Retirement Fund	–	–	–	–	Not filed
California Public Employees Retirement System	–	–	–	–	Not filed
NZS Capital, LLC	–	–	–	–	Not filed
ExodusPoint Capital Management, LP	–	–	–	–	Not filed
FORA Capital, LLC	–	–	–	–	Not filed
Jacobs Levy Equity Management, Inc	–	–	–	–	Not filed
HRT Financial LP	–	–	–	–	Not filed
Weitz Investment Management, Inc.SuperinvestorWeitz Investment Management	–	–	–	–	Not filed
Y-Intercept (Hong Kong) Ltd	–	–	–	–	Not filed
Geneva Capital Management LLC	–	–	–	–	Not filed
Ninety One UK Ltd	–	–	–	–	Not filed
Susquehanna International Group, LLP	–	–	–	–	Not filed
State of Wisconsin Investment Board	–	–	–	–	Not filed
Ardmore Road Asset Management LP	–	–	–	–	Not filed
State Board of Administration of Florida Retirement System	–	–	–	–	Not filed
Adage Capital Partners GP, L.L.C.	–	–	–	–	Not filed
First Citizens Bank & Trust Co	–	–	–	–	Not filed
Mariner, LLC	–	–	–	–	Not filed
Prana Capital Management, LP	–	–	–	–	Not filed
Ieq Capital, LLC	–	–	–	–	Not filed
Ossiam	–	–	–	–	Not filed
Envestnet Portfolio Solutions, Inc.	–	–	–	–	Not filed
SEI Investments Co	–	–	–	–	Not filed
Raymond James Financial Inc	–	–	–	–	Not filed
New York State Teachers Retirement System	–	–	–	–	Not filed
Standard Life Aberdeen plc	–	–	–	–	Not filed
Ironvine Capital Partners, LLC	–	–	–	–	Not filed
Tsai Capital Corp	–	–	–	–	Not filed
S.E.E.D. Planning Group LLC	–	–	–	–	Not filed
XTX Topco Ltd	–	–	–	–	Not filed
Creative Planning	–	–	–	–	Not filed
Teachers Retirement System of the State of Kentucky	–	–	–	–	Not filed
Zurcher Kantonalbank (Zurich Cantonalbank)	–	–	–	–	Not filed
Pathstone Holdings, LLC	–	–	–	–	Not filed
Oppenheimer Asset Management Inc.	–	–	–	–	Not filed
DekaBank Deutsche Girozentrale	–	–	–	–	Not filed
Cerity Partners LLC	–	–	–	–	Not filed
Sone Capital Management, LLC	–	–	–	–	Not filed
APG Asset Management N.V.	–	–	–	–	Not filed
CIBC Bancorp USA Inc.	–	–	–	–	Not filed
Aviva PLC	–	–	–	–	Not filed
Tremblant Capital Group	–	–	–	–	Not filed
DnB Asset Management AS	–	–	–	–	Not filed
Manufacturers Life Insurance Company, The	–	–	–	–	Not filed
Aquatic Capital Management LLC	–	–	–	–	Not filed
Holocene Advisors, LP	–	–	–	–	Not filed
Vanguard Investments Australia, Ltd.	–	–	–	–	Not filed
Universal- Beteiligungs- und Servicegesellschaft mbH	–	–	–	–	Not filed
Omers Administration Corp	–	–	–	–	Not filed
Prudential Financial Inc	–	–	–	–	Not filed
La Banque Postale Asset Management SA	–	–	–	–	Not filed
Chevy Chase Trust Holdings, Inc.	–	–	–	–	Not filed
Louisbourg Investments Inc.	–	–	–	–	Not filed
Royal London Asset Management Ltd	–	–	–	–	Not filed
Ameriprise Financial Inc	–	–	–	–	Not filed
Asset Management One Co.,Ltd.	–	–	–	–	Not filed
Swedbank AB	–	–	–	–	Not filed
Jones Financial Companies LLLP	–	–	–	–	Not filed
Danske Bank A/S	–	–	–	–	Not filed
Treasurer of the State of North Carolina	–	–	–	–	Not filed
Great West Life Assurance Co	–	–	–	–	Not filed
Commonwealth of Pennsylvania Public School Empls Retrmt Sys	–	–	–	–	Not filed
NEOS Investment Management LLC	–	–	–	–	Not filed
Andra AP-fonden	–	–	–	–	Not filed
Stifel Financial Corp	–	–	–	–	Not filed
Needham Investment Management LLC	–	–	–	–	Not filed
Mercer Global Advisors Inc	–	–	–	–	Not filed
Catalyst Funds Management Pty Ltd	–	–	–	–	Not filed
American Century Companies Inc	–	–	–	–	Not filed
Landmark Investment Partners, L.P.	–	–	–	–	Not filed
Mackenzie Financial Corp	–	–	–	–	Not filed
Natixis Advisors, L.P.	–	–	–	–	Not filed
Jupiter Asset Management Ltd	–	–	–	–	Not filed
KLP Kapitalforvaltning AS	–	–	–	–	Not filed
TD Asset Management Inc	–	–	–	–	Not filed
Nomura Asset Management Co Ltd	–	–	–	–	Not filed
Jefferies Financial Group Inc.	–	–	–	–	Not filed
Qsemble Capital Management, LP	–	–	–	–	Not filed
Caxton Associates LLP	–	–	–	–	Not filed
Franklin Resources Inc	–	–	–	–	Not filed
Credit Agricole S A	–	–	–	–	Not filed
State of New Jersey Common Pension Fund D	–	–	–	–	Not filed
Glenmede Trust Co NA	–	–	–	–	Not filed
Lansforsakringar Fondforvaltning AB (publ)	–	–	–	–	Not filed
Toronto Dominion Bank	–	–	–	–	Not filed
Walleye Capital LLC	–	–	–	–	Not filed
Fjarde Ap-Fonden /Fourth Swedish National Pension Fund	–	–	–	–	Not filed
LPL Financial LLC	–	–	–	–	Not filed
Point72 Asset Management, L.P.	–	–	–	–	Not filed
Handelsbanken Fonder AB	–	–	–	–	Not filed
Brown Advisory Inc	–	–	–	–	Not filed
Nykredit A/S	–	–	–	–	Not filed
Fideuram Asset Management (Ireland) dac	–	–	–	–	Not filed
Abn Amro Investment Solutions	–	–	–	–	Not filed
Botty Investors LLC	–	–	–	–	Not filed
Apollon Wealth Management, LLC	–	–	–	–	Not filed
Vanderbilt University	–	–	–	–	Not filed
Lighthouse Investment Partners, LLC	–	–	–	–	Not filed
Cetera Investment Advisers	–	–	–	–	Not filed