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Costar Group, Inc.

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

No open-market purchases or sales by Costar Group, Inc. insiders were filed in the last 90 days; 764 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.

Key figures

Market capClose on Nov 9, 2026
$12.6B
Insider buysOpen market, last 90 days
0
Insider sellsOpen market, last 90 days
0
13F holdersQ2 2026, −29 vs. previous quarter
764
13F valueReported value at the end of Q2 2026
$11.7B
Superinvestors holdingAt the end of Q2 2026
2

Price chart

Financials

See financial statements

From SEC filings, in USD.

Revenue, FY2025
$3.25B
+18.7% year over year
Net income, FY2025
$7.00M
−95.0% year over year
Free cash flow, FY2025
$123.0M
No comparable prior period
Revenue, Q3 FY2026
$952.0M
+14.2% year over year

Revenue flow, FY2025

Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.

Net income for FY2025: $7.00M (0.2% of revenue).

Short interest

See short data

From FINRA, settlement date Oct 15, 2026.

Short interest
15.0M
Shares sold short
Change
+1.70M
+12.8% vs. previous
Days to cover
2.88
At average daily volume

Superinvestors holding CSGP, Q2 2026

Go to the superinvestors tab

2 superinvestors report holding Costar Group, Inc. on Form 13F. Percentages are the stock's share of each portfolio.

Akre Capital Management

Chuck Akre

6.5%

Costar Group, Inc.'s share of the portfolio

Shares
11,699,396
Value
$331.3M

Weitz Investment Management

Wally Weitz

0.8%

Costar Group, Inc.'s share of the portfolio

Shares
423,181
Value
$12.0M

Latest insider trades

See all insider trades

Open-market purchases and sales by Costar Group, Inc. insiders from Form 4, newest first.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Aug 10, 2026 (view filing)4:06 PM ETAug 73 daysCann Cynthia CammettChief Accounting OfficerSSaleCommon Stock, par value $0.01 per share−4.79K$30.78−$147.4K−20.3%18.8K after
Aug 10, 2026 (view filing)4:06 PM ETAug 55 daysLateHill John WDirectorSSaleCommon Stock, par value $0.01 per share−3.50K$30.21−$105.7K−13.2%23.0K after
Aug 5, 2026 (view filing)9:27 AM ETAug 41 dayFlorance Andrew CFounder and CEOPPurchaseCommon Stock, par value $0.01 per share+83.3K$29.89+$2.49M+4.8%1.81M after
May 4, 2026 (view filing)May 13 daysFlorance Andrew CPresident and CEOPPurchaseCommon Stock, par value $0.01 per share+71.4K$35.20+$2.51M+4.3%1.72M after2 lots
Mar 9, 2026 (view filing)Mar 63 daysSams Louise SDirectorPPurchaseCommon Stock, par value $0.01 per share+1.00K$48.36+$48.4K+5.2%20.4K after
Mar 3, 2026 (view filing)Mar 21 daySaint Frederick G.President, MarketplacesPPurchaseCommon Stock, par value $0.01 per share+20.0K$45.33+$906.6K+7.7%279.9K after
Mar 3, 2026 (view filing)Mar 21 dayGlaser Rachel CDirectorPPurchaseCommon Stock, par value $0.01 per share+1.00K$44.94+$44.9K+31.7%4.16K after
Mar 2, 2026 (view filing)Feb 273 daysFlorance Andrew CPresident and CEOPPurchaseCommon Stock, par value $0.01 per share+55.7K$44.52+$2.48M+3.6%1.59M after
Nov 17, 2025 (view filing)Nov 134 daysHill John WDirectorSSaleCommon Stock, par value $0.01 per share−2.25K$68.68−$154.5K−11.0%18.2K after
Nov 17, 2025 (view filing)Nov 134 daysCann Cynthia CammettChief Accounting OfficerSSaleCommon Stock, par value $0.01 per share−1.84K$68.79−$126.6K−7.3%23.2K after

Top 10 13F holders, Q2 2026

See all 764 holders

The largest institutional positions in Costar Group, Inc. at the end of Q2 2026; share changes are against Q1 2026.

Institutions holding CSGP in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Vanguard Portfolio Management LLC37,914,844$1.07B0.05%−319,289−0.8%Reduced
BlackRock, Inc.33,813,969$957.6M0.01%+5,7850.0%Added
Vanguard Capital Management LLC26,683,792$755.7M0.02%−740,111−2.7%Reduced
Bamco Inc21,626,763$612.5M0.92%+5,312,588+32.6%Added
State Street Corp18,410,876$521.4M0.02%−240,099−1.3%Reduced
Capital International Investors16,643,016$471.3M0.10%+1,129,263+7.3%Added
Baillie Gifford & Co13,154,165$372.5M0.34%−456,757−3.4%Reduced
Geode Capital Management, LLC12,166,469$343.3M0.02%−282,183−2.3%Reduced
Akre Capital Management LLCSuperinvestorAkre Capital Management11,699,396$331.3M6.49%+1,351,123+13.1%Added
Polen Capital Management LLC8,759,314$248.1M2.14%−3,811,054−30.3%Reduced

Holders of 5% or more of CSGP

See all 4 holders and filings

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Costar Group, Inc..

Largest holders of CSGP from 13D and 13G filings
HolderLatest formStakeChangeFirst filedLatest filingFiling
Vanguard Portfolio Management LLC13G9.12%38.3M sharesNewApr 29, 20261 filingApr 29, 2026SEC
Vanguard Capital Management LLC13G7.53%31.6M sharesNewApr 29, 20261 filingApr 29, 2026SEC
BlackRock, Inc.13G/A7.50%31.8M shares–Apr 23, 20251 filingApr 23, 2025SEC
Bamco Inc13G5.30%21.6M shares–Feb 12, 20212 filingsAug 14, 2026SEC

Politician trades

All politician trades in CSGP

10 members of Congress reported 34 trades in Costar Group, Inc. since 2020. Newest filings:

  1. Gilbert Ray Cisneros, Jr.

    House · CA · Sep 10, 2026

    Buy$1K-$15K

  2. Gilbert Ray Cisneros, Jr.

    House · CA · May 8, 2026

    Sell (partial)$1K-$15K

  3. Gilbert Ray Cisneros, Jr.

    House · CA · Apr 7, 2026

    Buy$1K-$15K

  4. Gilbert Ray Cisneros, Jr.

    House · CA · Feb 13, 2026

    Buy$1K-$15K

  5. Gilbert Ray Cisneros, Jr.

    House · CA · Jan 12, 2026

    Buy$1K-$15K