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
Entropy Technologies, LP	–	–	–	–	Not filed
Arizona State Retirement System	–	–	–	–	Not filed
Resona Asset Management Co.,Ltd.	–	–	–	–	Not filed
ICICI Prudential Asset Management Co Ltd	–	–	–	–	Not filed
Public Employees Retirement System of Ohio	–	–	–	–	Not filed
Public Sector Pension Investment Board	–	–	–	–	Not filed
Czech National Bank	–	–	–	–	Not filed
HighTower Advisors, LLC	–	–	–	–	Not filed
Dash Acquisitions Inc.	–	–	–	–	Not filed
State of Michigan Retirement System	–	–	–	–	Not filed
IFM Investors Pty Ltd	–	–	–	–	Not filed
National Bank of Canada	–	–	–	–	Not filed
North Star Asset Management Inc	–	–	–	–	Not filed
Havemeyer Place LP	–	–	–	–	Not filed
Night Owl Capital Management, LLC	–	–	–	–	Not filed
Wealth Enhancement Advisory Services, LLC	–	–	–	–	Not filed
Victory Capital Management Inc	–	–	–	–	Not filed
Ivy Lane Capital Management, LLC	–	–	–	–	Not filed
Headlands Technologies LLC	–	–	–	–	Not filed
Buttonwood Financial Advisors Inc.	–	–	–	–	Not filed
Acadian Asset Management LLC	–	–	–	–	Not filed
CIBC Asset Management Inc	–	–	–	–	Not filed
Engineers Gate Manager LP	–	–	–	–	Not filed
MetLife Investment Management	–	–	–	–	Not filed
Elo Mutual Pension Insurance Co	–	–	–	–	Not filed
Graham Capital Management, L.P.	–	–	–	–	Not filed
Bank of Nova Scotia	–	–	–	–	Not filed
Daiwa Securities Group Inc.	–	–	–	–	Not filed
MML Investors Services, LLC	–	–	–	–	Not filed
Mirae Asset Global Investments Co., Ltd.	–	–	–	–	Not filed
Fayez Sarofim & Co	–	–	–	–	Not filed
Odyssean, LLC	–	–	–	–	Not filed
Boston Private Wealth LLC	–	–	–	–	Not filed
Woodline Partners LP	–	–	–	–	Not filed
Gilder Gagnon Howe & Co LLC	–	–	–	–	Not filed
Ashford Capital Management Inc	–	–	–	–	Not filed
CWM Advisors, LLC	–	–	–	–	Not filed
KBC Group NV	–	–	–	–	Not filed
Retirement Systems of Alabama	–	–	–	–	Not filed
Brinker Capital Investments, LLC	–	–	–	–	Not filed
SEB Asset Management AB	–	–	–	–	Not filed
Linden Thomas Advisory Services, LLC	–	–	–	–	Not filed
Captrust Financial Advisors	–	–	–	–	Not filed
CI Private Wealth, LLC	–	–	–	–	Not filed
Voya Investment Management LLC	–	–	–	–	Not filed
Fifth Third Bancorp	–	–	–	–	Not filed
ProShare Advisors LLC	–	–	–	–	Not filed
Red Spruce Capital, LLC	–	–	–	–	Not filed
Xponance, Inc.	–	–	–	–	Not filed
Amalgamated Bank	–	–	–	–	Not filed
State of Tennessee, Treasury Department	–	–	–	–	Not filed
CenterBook Partners LP	–	–	–	–	Not filed
HB Wealth Management, LLC	–	–	–	–	Not filed
Rakuten Investment Management, Inc.	–	–	–	–	Not filed
Quantitative Investment Management, LLC	–	–	–	–	Not filed
Federation des caisses Desjardins du Quebec	–	–	–	–	Not filed
Toroso Investments, LLC	–	–	–	–	Not filed
Delta Global Management LP	–	–	–	–	Not filed
Thrivent Financial for Lutherans	–	–	–	–	Not filed
The PNC Financial Services Group, Inc.	–	–	–	–	Not filed
Numerai GP LLC	–	–	–	–	Not filed
Bastion Asset Management Inc.	–	–	–	–	Not filed
Mirae Asset Global ETFs Holdings Ltd.	–	–	–	–	Not filed
Employees Retirement System of Texas	–	–	–	–	Not filed
Quantbot Technologies LP	–	–	–	–	Not filed
British Columbia Investment Management Corp	–	–	–	–	Not filed
Police & Firemen's Retirement System of New Jersey	–	–	–	–	Not filed
Utah Retirement Systems	–	–	–	–	Not filed
Atria Investments LLC	–	–	–	–	Not filed
Sumitomo Mitsui DS Asset Management Company, Ltd	–	–	–	–	Not filed
Robeco Institutional Asset Management B.V.	–	–	–	–	Not filed
Swiss Life Asset Management Ltd	–	–	–	–	Not filed
Nissay Asset Management Corp	–	–	–	–	Not filed
New York Life Investment Management LLC	–	–	–	–	Not filed
Allianz SE	–	–	–	–	Not filed
Sequoia Financial Advisors, LLC	–	–	–	–	Not filed
Everence Capital Management Inc	–	–	–	–	Not filed
Skylands Capital, LLC	–	–	–	–	Not filed
Gsa Capital Partners LLP	–	–	–	–	Not filed
Itau Unibanco Holding S.A.	–	–	–	–	Not filed
Occudo Quantitative Strategies LP	–	–	–	–	Not filed
SG Americas Securities, LLC	–	–	–	–	Not filed
Rothschild Investment LLC	–	–	–	–	Not filed
Rafferty Asset Management, LLC	–	–	–	–	Not filed
Oregon Public Employees Retirement Fund	–	–	–	–	Not filed
Wellington Management Group LLP	–	–	–	–	Not filed
Axq Capital, LP	–	–	–	–	Not filed
OP Asset Management Ltd	–	–	–	–	Not filed
SRS Capital Advisors, Inc.	–	–	–	–	Not filed
Nordea Investment Management AB	–	–	–	–	Not filed
US Bancorp	–	–	–	–	Not filed
Hahn Capital Management LLC	–	–	–	–	Not filed
Macquarie Group Ltd	–	–	–	–	Not filed
Virtu Financial LLC	–	–	–	–	Not filed
JustInvest LLC	–	–	–	–	Not filed
Machina Capital S.A.S.	–	–	–	–	Not filed
National Pension Service	–	–	–	–	Not filed
Yousif Capital Management, LLC	–	–	–	–	Not filed
Mutual of America Capital Management LLC	–	–	–	–	Not filed
Picton Mahoney Asset Management	–	–	–	–	Not filed