COSTAR GROUP, INC.

CSGPNASDAQ

$27.63-0.03 (-0.11%)as of Oct 6, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

COSTAR GROUP, INC. price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 6, 2026. Price (-66.0%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
Vanguard Portfolio Management LLC	9.28%	$1.07B	0.05%	Not reported
BlackRock, Inc.	8.28%	$958M	0.01%	Not reported
Vanguard Capital Management LLC	6.53%	$756M	0.02%	Not reported
Bamco Inc	5.30%	$612M	0.92%	Add 32.56%
State Street Corp	4.51%	$521M	0.02%	Not reported
Capital International Investors	4.08%	$471M	0.10%	Add 7.28%
Baillie Gifford & Co	3.22%	$373M	0.34%	Reduce 3.36%
Geode Capital Management, LLC	2.98%	$343M	0.02%	Not reported
Akre Capital Management LLC	2.87%	$331M	6.47%	Add 13.06%
Polen Capital Management LLC	2.15%	$248M	2.14%	Reduce 30.32%
AQR Capital Management LLC	2.07%	$239M	0.08%	Not reported
Jupiter Topco LLC	1.92%	$222M	0.09%	Not reported
Invesco Ltd.	1.67%	$193M	0.02%	Not reported
EdgePoint Investment Group Inc.	1.46%	$169M	1.27%	New Not reported
Norges Bank	1.46%	$169M	0.02%	Not reported
Morgan Stanley	1.34%	$155M	0.01%	Not reported
Meritage Group LP	1.32%	$153M	5.89%	Add 62.04%
Goldman Sachs Group Inc	1.26%	$145M	0.01%	Not reported
JPMorgan Chase & Co	1.21%	$145M	0.01%	Not reported
Federated Hermes, Inc.	1.08%	$125M	0.18%	Not reported
Capital Research Global Investors	1.03%	$119M	0.02%	Not reported
Principal Financial Group Inc	0.93%	$107M	0.05%	Not reported
Northern Trust Corp	0.84%	$97.7M	0.01%	Not reported
Qube Research & Technologies Ltd	0.79%	$91.1M	0.08%	Not reported
BNP PARIBAS ASSET MANAGEMENT Holding S.A.	0.77%	$88.9M	0.09%	Add 17.24%
Amundi	0.77%	$88.8M	0.02%	Not reported
Van Eck Associates Corp	0.75%	$87.2M	0.05%	Reduce 11.49%
Massachusetts Financial Services Co	0.73%	$84.5M	0.03%	Add 212.10%
Charles Schwab Investment Management Inc	0.73%	$83.9M	0.01%	Not reported
Bank of America Corp	0.67%	$77.5M	0.01%	Not reported
Spyglass Capital Management LLC	0.66%	$76.3M	4.13%	Add 142.50%
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	0.62%	$71.4M	0.01%	Not reported
Canada Pension Plan Investment Board	0.61%	$70.3M	0.04%	Add 23.41%
FMR LLC	0.61%	$70.1M	0.00%	Not reported
Nomura Asset Management International Inc.	0.59%	$68.1M	0.10%	Add 2.97%
Ensign Peak Advisors, Inc	0.58%	$67.2M	0.11%	Reduce 13.20%
UBS Group AG	0.57%	$65.9M	0.01%	Not reported
Vanguard Fiduciary Trust Co	0.56%	$65.1M	0.01%	Not reported
Deutsche Bank Ag\	0.55%	$64.1M	0.02%	Not reported
Bank of Montreal	0.54%	$62.6M	0.02%	Not reported
Jane Street Group, LLC	0.53%	$61.2M	0.01%	Not reported
Beck Mack & Oliver LLC	0.51%	$59M	1.15%	Reduce 28.79%
Bank of New York Mellon Corp	0.49%	$56.8M	0.01%	Not reported
Thompson Siegel & Walmsley LLC	0.43%	$49.4M	0.89%	Add 183.47%
Erste Asset Management GmbH	0.42%	$49.8M	0.39%	Add 277.78%
Legal & General Group Plc	0.41%	$47.7M	0.01%	Not reported
BNP Paribas Financial Markets	0.39%	$44.7M	0.02%	Not reported
Fiera Capital Corp	0.38%	$44.4M	0.16%	Add 225.27%
Voloridge Investment Management, LLC	0.38%	$43.7M	0.19%	Add 16.06%
Envestnet Asset Management Inc	0.38%	$43.5M	0.01%	Not reported

50 of 709 holders

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