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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.

Q1 2026 vs. Q4 2025

How the institutions holding Costar Group, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026All holders in Q4 2025

13F holders of CSGP: Q4 2025 compared with Q1 2026
MeasureQ4 2025Of which not filed for Q1 2026Q1 2026Change
Holders84716797−34
Shares422.7M80.1M415.9M+73.3M (+21.4%)
Value$28.4B$5.39B$16.8B−$6.24B (−27.1%)

16 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (130)

Institutions that held Costar Group, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Showing the largest 100 of 130 by value.

Institutions new to CSGP in Q1 2026
InstitutionSharesValue% of portfolio
Vanguard Portfolio Management LLC38,234,133$1.54B0.08%
Vanguard Capital Management LLC27,423,903$1.11B0.03%
Meritage Group LP3,329,006$134.3M5.07%
Vanguard Fiduciary Trust Co2,391,061$96.5M0.02%
Greenhouse Funds LLLP1,377,305$55.6M2.63%
Capitolis Liquid Global Markets LLC1,355,000$54.7M0.35%
Voloridge Investment Management, LLC1,329,958$53.7M0.21%
Vanguard Global Advisers, LLC928,271$37.4M0.02%
Corvex Management LP851,734$34.4M1.37%
Vanguard Asset Management, Ltd717,670$29.0M0.02%
Ardmore Road Asset Management LP666,900$26.9M1.77%
Thompson Siegel & Walmsley LLC615,251$24.8M0.44%
CIBC Bancorp USA Inc.500,113$20.2M0.03%
Northwood Liquid Management LP483,200$19.5M1.31%
Two Sigma Investments, LP303,004$12.2M0.01%
LMR Partners LLP252,950$10.2M0.09%
FORA Capital, LLC252,068$10.2M0.74%
Tsai Capital Corp226,726$9.15M6.81%
Vanguard Investments Australia, Ltd.210,994$8.51M0.02%
EVR Research LP130,000$5.24M2.99%
Botty Investors LLC127,000$5.12M1.22%
Connor, Clark & Lunn Investment Management Ltd.107,678$4.34M0.01%
Winton Group Ltd101,423$4.09M0.14%
Holocene Advisors, LP92,988$3.75M0.01%
Caxton Associates LLP83,948$3.39M0.08%
SEB Asset Management AB83,393$3.36M0.01%
Mirova78,550$3.17M0.13%
Trexquant Investment LP73,067$2.95M0.02%
Ivy Lane Capital Management, LLC59,000$2.38M3.60%
Capital Fund Management S.A.46,353$1.87M0.02%
Arrowstreet Capital, Limited Partnership40,911$1.65M0.00%
Headlands Technologies LLC35,428$1.43M0.16%
Qsemble Capital Management, LP35,343$1.43M0.11%
Axq Capital, LP30,465$1.23M0.16%
Gsa Capital Partners LLP26,950$1.09M0.07%
PEAK6 LLC26,037$1.05M0.03%
Graham Capital Management, L.P.21,360$861.7K0.03%
Everence Capital Management Inc18,734$756.0K0.05%
Paragon Capital Management Inc18,360$740.6K0.63%
Pacific Capital Partners Ltd17,300$697.9K0.69%
Prelude Capital Management, LLC17,215$694.5K0.05%
Unique Wealth Strategies, LLC16,770$676.5K0.28%
Dynamic Technology Lab Private Ltd16,553$667.7K0.11%
Osmosis Investment Management UK Ltd16,392$661.3K0.02%
Farringdon Capital, Ltd.15,697$633.2K0.14%
Saudi Central Bank15,644$631.1K0.01%
PKO Investment Management Joint-Stock Co15,000$605.1K0.05%
E Fund Management Co., Ltd.14,915$601.7K0.02%
Meiji Yasuda Life Insurance Co13,720$553.5K0.02%
Premier Path Wealth Partners, LLC13,628$549.8K0.07%
Potomac Capital Management, Inc.12,000$484.1K0.42%
Brighton Jones LLC11,495$463.7K0.01%
Quantbot Technologies LP11,055$446.0K0.02%
Capula Management Ltd10,430$420.7K0.00%
Perennial Investment Advisors, LLC10,156$409.7K0.03%
111 Capital10,003$403.5K0.10%
Magnetar Financial LLC9,789$400.2K0.00%
Perbak Capital Partners LLP9,909$399.7K0.10%
Two Sigma Securities, LLC9,624$388.2K0.05%
Nicolet Bankshares Inc9,795$388.2K0.01%
Brevan Howard Capital Management LP9,486$382.7K0.00%
Potomac Fund Management Inc9,387$378.7K0.01%
CAPROCK Group, Inc.8,981$362.3K0.01%
Hillman Capital Management, Inc.8,557$345.2K0.24%
Sentinus, LLC8,441$340.5K0.03%
Buckingham Strategic Partners8,346$336.7K0.00%
Bayesian Capital Management, LP8,100$326.8K0.40%
Castleview Partners, LLC8,012$323.2K0.17%
Commerzbank Aktiengesellschaft7,761$313.0K0.01%
Pallas Capital Advisors LLC7,437$300.0K0.01%
Jump Financial, LLC7,141$288.1K0.00%
Blueshift Asset Management, LLC6,985$281.8K0.09%
IMC-Chicago, LLC6,637$267.7K0.00%
Sig Brokerage, LP6,424$259.1K0.07%
Savvy Advisors, Inc.6,404$258.3K0.01%
CIBC World Markets Inc.6,299$254.1K0.00%
Blue Sparrow, LLC6,160$248.5K0.00%
Integrated Advisors Network LLC6,140$247.7K0.01%
Skopos Labs, Inc.6,128$247.2K0.01%
Evolve Private Wealth, LLC5,965$240.6K0.01%
Fifth Third Wealth Advisors LLC5,638$227.4K0.01%
Fox Run Management, L.L.C.5,348$218.6K0.04%
Alpha Family Trust5,410$218.2K0.11%
Meeder Asset Management Inc5,392$217.5K0.01%
AlphaGrep UK Ltd5,211$210.2K0.06%
Wallace Advisory Group, LLC5,191$209.4K0.22%
Advisory Services Network, LLC4,202$169.5K0.00%
Archetype Wealth Partners2,660$107.0K0.01%
Oslo Pensjonsforsikring AS2,309$93.1K0.01%
Mather Group, LLC.2,170$87.5K0.00%
Atlas Capital Advisors LLC1,032$41.6K0.00%
EFG International AG865$34.9K0.00%
Select Equity Group, L.P.767$30.9K0.00%
Timothy G. Youngquist 2020 Irrevocable Trust625$25.2K0.01%
WealthCollab, LLC500$20.2K0.01%
Hilltop National Bank380$15.3K0.00%
Owl Creek Wealth Partners LLC345$13.9K0.00%
Osterweis Capital Management Inc326$13.2K0.00%
Avalon Trust Co297$12.0K0.00%
JNBA Financial Advisors222$8.96K0.00%

Sold out (164)

Institutions that held Costar Group, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

Showing the largest 100 of 164 by value.

Institutions that sold out of CSGP in Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Vulcan Value Partners, LLC4,485,021$301.5M
T. Rowe Price Investment Management, Inc.3,464,794$233.0M
Third Point LLCSuperinvestorThird Point3,165,000$212.8M
RGM Capital, LLC1,995,460$134.2M
Viking Global Investors LPSuperinvestorViking Global Investors1,442,582$97.0M
Harding Loevner LP920,272$61.9M
Kensico Capital Management Corp901,600$60.6M
SG Capital Management LLC811,181$54.5M
Junto Capital Management LP615,998$41.4M
Caisse de Depot Et Placement du Quebec587,098$39.5M
ION Fund Management Ltd461,000$31.0M
Clearbridge Investments, LLC382,138$25.7M
LGT Group Foundation347,732$23.6M
Ci Investments Inc.343,534$23.1M
Aureus Asset Management, LLC337,117$22.7M
Ulysses Management LLC330,500$22.2M
Parnassus Investments272,688$18.3M
ThornTree Capital Partners LP242,032$16.3M
No Street GP LP239,999$16.1M
Tran Capital Management, L.P.233,303$15.7M
Quantum Capital Management, LLC218,583$14.7M
NS Partners Ltd214,981$14.5M
Visualize Group LP214,388$14.4M
Freestone Grove Partners LP201,205$13.5M
Jennison Associates LLC164,960$11.1M
Clearline Capital LP118,041$7.94M
Fred Alger Management, LLC112,357$7.55M
2Xideas AG108,267$7.28M
Kelly Lawrence W & Associates Inc106,284$7.15M
Greenvale Capital LLP100,000$6.72M
Azimuth Capital Investment Management LLC94,063$6.32M
Equitable Trust Co93,581$6.29M
Skandinaviska Enskilda Banken AB (publ)81,263$5.46M
ING Groep NV64,844$4.36M
LGT Fund Management Co Ltd.50,530$3.43M
Taikang Asset Management (Hong Kong) Co Ltd45,969$3.09M
NFJ Investment Group, LLC42,415$2.85M
Oppenheimer & Co Inc39,791$2.68M
Schonfeld Strategic Advisors LLC39,225$2.64M
Katamaran Capital LLP36,651$2.46M
Boomfish Wealth Group, LLC34,474$2.32M
Allstate Corp33,862$2.28M
Delta Global Management LP31,841$2.14M
Gateway Investment Advisers LLC28,779$1.94M
AG2R la Mondiale Gestion D'Actifs27,342$1.84M
Kentucky Retirement Systems26,218$1.76M
Virtus Investment Advisers, Inc.24,381$1.64M
Twin Tree Management, LP22,466$1.51M
First Bank & Trust20,028$1.35M
Group One Trading, L.P.19,737$1.33M
Maridea Wealth Management LLC19,393$1.30M
Dai-Ichi Life Insurance Company, Ltd17,377$1.17M
Main Management ETF Advisors, LLC17,226$1.16M
Lombard Odier Asset Management (Switzerland) SA16,820$1.13M
Elo Mutual Pension Insurance Co16,684$1.12M
Verition Fund Management LLC16,042$1.08M
Kestra Advisory Services, LLC14,355$965.2K
Sumitomo Life Insurance Co14,090$947.4K
Howard Capital Management Inc.12,762$858.1K
Turtle Creek Wealth Advisors, LLC11,995$806.5K
Volterra Technologies LP11,925$801.8K
Colony Capital, Inc.11,700$786.7K
Narwhal Capital Management11,383$765.4K
TradeLink Capital LLC11,356$764.0K
Odyssean, LLC11,342$762.6K
Bleakley Financial Group, LLC11,242$755.9K
Quest Partners LLC9,729$654.2K
Inceptionr LLC9,598$645.4K
Bridgewater Associates, LP9,020$606.5K
Warren Averett Asset Management, LLC8,948$601.7K
Fortress Wealth Group, LLC9,699$596.5K
Ritholtz Wealth Management8,369$562.7K
Michael B. Yongue7,396$497.3K
First Manhattan Co6,847$460.4K
Buckhead Capital Management LLC6,810$457.9K
Private Advisor Group, LLC6,686$449.6K
Hilltop Holdings Inc.6,507$437.5K
LRT Capital Management, LLC6,247$420.0K
Oarsman Capital, Inc.6,002$403.6K
Birch Financial Group, LLC5,988$402.7K
Wedbush Securities Inc5,905$397.0K
Argos Wealth Advisors, LLC5,608$377.1K
Kovitz Investment Group Partners, LLC5,488$369.0K
IVC Wealth Advisors LLC5,464$367.4K
Strait & Sound Wealth Management LLC5,274$354.6K
Forum Financial Management, LP5,051$339.6K
Howard Bailey Securities, LLC5,031$338.3K
Adviser Investments LLC4,590$308.6K
Chatham Capital Group, Inc.4,456$299.6K
Brown Miller Wealth Management, LLC4,444$298.8K
One Wealth Capital Management, LLC4,438$298.4K
Journey Retirement Planning & Investment Management LLC4,314$290.1K
Moran Wealth Management, LLC4,298$289.0K
Apriem Advisors4,208$282.9K
Mount Yale Investment Advisors, LLC4,181$281.1K
CCG Wealth Management, LLC4,171$280.5K
Picton Mahoney Asset Management4,140$278.4K
Cigna Investments Inc4,135$278.0K
Flputnam Investment Management Co4,069$273.6K
Aprio Wealth Management, LLC4,068$273.5K

Not filed for Q1 2026 yet (16)

Institutions that held Costar Group, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding CSGP in Q4 2025 that haven't filed for Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Vanguard Group Inc70,108,999$4.71B
Norges Bank7,090,495$476.8M
CIBC Private Wealth Group, LLC1,361,651$91.6M
Capitolis Liquid Global Markets LLC1,184,000$79.6M
CIBC World Markets Corp186,141$12.5M
Forsta Ap-Fonden82,400$5.54M
Comerica Bank64,101$4.31M
Canandaigua National Bank & Trust Co5,242$352.5K
David Loasby5,693$337.6K
Global Retirement Partners, LLC4,027$270.8K
SG Trading Solutions, LLC3,237$218.0K
STF Management LP2,287$153.8K
DV Equities, LLC590$39.7K
ORG Partners LLC145$9.73K
Trust Co of Vermont75$5.04K
Stephens Consulting, LLC15$1.01K