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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.

13F holders, Q1 2026

Institutional positions in Costar Group, Inc. as of Mar 31, 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

Institutional holders
797
−34 vs. Q4 2025
Shares held
415.9M
+73.3M (+21.4%) vs. Q4 2025
Total value
$16.8B
−$6.24B (−27.1%) vs. Q4 2025
New holders
130
308 more added
Sold out
164
276 more reduced

16 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q4 2025: 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 holdersQ1 2026: 797 institutions
Q1 2021: 593 institutionsQ2 2021: 607 institutionsQ3 2021: 594 institutionsQ4 2021: 633 institutionsQ1 2022: 589 institutionsQ2 2022: 591 institutionsQ3 2022: 634 institutionsQ4 2022: 704 institutionsQ1 2023: 692 institutionsQ2 2023: 714 institutionsQ3 2023: 690 institutionsQ4 2023: 737 institutionsQ1 2024: 767 institutionsQ2 2024: 767 institutionsQ3 2024: 773 institutionsQ4 2024: 805 institutionsQ1 2025: 858 institutionsQ2 2025: 873 institutionsQ3 2025: 905 institutionsQ4 2025: 847 institutionsQ1 2026: 797 institutionsQ2 2026: 760 institutions
Value heldQ1 2026: $16.8B
Q1 2021: $31.2BQ2 2021: $31.1BQ3 2021: $32.3BQ4 2021: $29.6BQ1 2022: $25.2BQ2 2022: $23.0BQ3 2022: $28.0BQ4 2022: $30.4BQ1 2023: $26.7BQ2 2023: $35.5BQ3 2023: $30.1BQ4 2023: $34.4BQ1 2024: $38.4BQ2 2024: $29.3BQ3 2024: $30.0BQ4 2024: $28.9BQ1 2025: $33.9BQ2 2025: $34.2BQ3 2025: $34.9BQ4 2025: $28.4BQ1 2026: $16.8BQ2 2026: $11.7B
Institutions holding CSGP and their total value by quarter
QuarterHoldersValue
Q2 2026760$11.7B
Q1 2026797$16.8B
Q4 2025847$28.4B
Q3 2025905$34.9B
Q2 2025873$34.2B
Q1 2025858$33.9B
Q4 2024805$28.9B
Q3 2024773$30.0B
Q2 2024767$29.3B
Q1 2024767$38.4B
Q4 2023737$34.4B
Q3 2023690$30.1B
Q2 2023714$35.5B
Q1 2023692$26.7B
Q4 2022704$30.4B
Q3 2022634$28.0B
Q2 2022591$23.0B
Q1 2022589$25.2B
Q4 2021633$29.6B
Q3 2021594$32.3B
Q2 2021607$31.1B
Q1 2021593$31.2B

Institutions, Q1 2026

Shares, value and share of portfolio for each institution holding Costar Group, Inc.; share changes are against Q4 2025.

Institutions holding CSGP in Q1 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Avion Wealth21$00.00%−17−44.7%Reduced
Eastern Bank1$400.00%00.0%Unchanged
Hollencrest Capital Management1$400.00%00.0%Unchanged
Scarborough Advisors, LLC1$400.00%00.0%Unchanged
Ameriflex Group, Inc.1$400.00%00.0%Unchanged
Curio Wealth, LLC1$400.00%+1New
Rialto Wealth Management, LLC1$410.00%−3−75.0%Reduced
TFC Financial Management2$810.00%−5−71.4%Reduced
MidFirst Bank2$810.00%+2New
3 Factor Indexing, LLC2$810.00%+2New
Lloyd Advisory Services, LLC.3$1210.00%−424−99.3%Reduced
1015 Capital Partners, LLC3$1210.00%−5−62.5%Reduced
Kingdom Financial Group LLC.3$1210.00%00.0%Unchanged
Vision Financial Markets LLC3$1220.00%00.0%Unchanged
Sunbelt Securities, Inc.4$1610.00%−1−20.0%Reduced
DecisionPoint Financial, LLC4$1620.00%00.0%Unchanged
CDKV Holdings LLC4$1620.00%00.0%Unchanged
Sound Income Strategies, LLC5$1980.00%00.0%Unchanged
Bay Harbor Wealth Management, LLC5$2010.00%−24−82.8%Reduced
United Community Bank5$2020.00%00.0%Unchanged
Trust Co of Toledo NA5$2020.00%+5New
TopTier Wealth Management, LLC5$2020.00%+5New
SHP Wealth Management6$2420.00%−12−66.7%Reduced
Brown, Lisle/Cummings, Inc.6$2420.00%00.0%Unchanged
Vermillion Wealth Management, Inc.7$2820.00%+7New
American Capital Advisory, LLC7$2830.00%−6−46.2%Reduced
Global Trust Asset Management, LLC10$4030.00%00.0%Unchanged
Key Financial Inc10$4030.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.10$4040.00%−18−64.3%Reduced
Marquette Asset Management, LLC11$4440.00%−59−84.3%Reduced
Highline Wealth Partners LLC12$4840.00%−14−53.8%Reduced
Hughes Financial Services, LLC12$4840.00%+8+200.0%Added
Caitlin John, LLC12$4840.00%+12New
Rachor Investment Advisory Services, LLC12$4850.00%−17−58.6%Reduced
Portus Wealth Advisors, LLC15$6050.00%+15New
SJS Investment Consulting Inc.17$6860.00%−95−84.8%Reduced
Aspect Partners, LLC17$6860.00%00.0%Unchanged
1620 Investment Advisors, Inc.18$7260.00%00.0%Unchanged
Salem Investment Counselors Inc20$8070.00%+20New
RWM Asset Management, LLC20$8070.00%+20New
Cassaday & Co Wealth Management LLC20$8070.00%+20New
Proathlete Wealth Management LLC21$8470.00%00.0%Unchanged
Financial Management Professionals, Inc.21$8470.00%+15+250.0%Added
Washington Trust Advisors, Inc.22$8870.00%−50−69.4%Reduced
Fortitude Family Office, LLC22$8870.00%−25−53.2%Reduced
PayPay Securities Corp23$9210.03%−1−4.2%Reduced
CKW Financial Group20$1.00K0.00%00.0%Unchanged
Thurston, Springer, Miller, Herd & Titak, Inc.25$1.01K0.00%00.0%Unchanged
AdvisorNet Financial, Inc25$1.01K0.00%+15+150.0%Added
NBT Bank N A25$1.01K0.00%+25New
Dunhill Financial, LLC25$1.01K0.00%−3−10.7%Reduced
NVWM, LLC27$1.09K0.00%+5+22.7%Added
Clark Wealth Partners27$1.09K0.00%+24+800.0%Added
Signature Equity Partners, LLC29$1.17K0.00%00.0%Unchanged
Purpose Unlimited Inc.30$1.21K0.00%−102−77.3%Reduced
N.E.W. Advisory Services LLC30$1.21K0.00%00.0%Unchanged
JFS Wealth Advisors, LLC30$1.21K0.00%−88−74.6%Reduced
CoreCap Advisors, LLC31$1.25K0.00%+26+520.0%Added
Bogart Wealth, LLC32$1.29K0.00%−144−81.8%Reduced
Keating Financial Advisory Services, Inc.35$1.41K0.00%−66−65.3%Reduced
Graney & King, LLC35$1.41K0.00%00.0%Unchanged
Crewe Advisors LLC40$1.61K0.00%+16+66.7%Added
Country Trust Bank41$1.65K0.00%00.0%Unchanged
Activest Wealth Management49$1.98K0.00%+2+4.3%Added
HM Payson & Co50$2.02K0.00%−42−45.7%Reduced
Valued Wealth Advisors LLC50$2.02K0.00%00.0%Unchanged
Rakuten Securities, Inc.50$2.02K0.00%00.0%Unchanged
Gill Capital Partners, LLC50$2.02K0.00%+50New
Signature Resources Capital Management, LLC50$2.02K0.00%+50New
Sachetta, LLC52$2.10K0.00%+13+33.3%Added
First Horizon Corp58$2.34K0.00%00.0%Unchanged
Cornerstone Financial Management LLC59$2.38K0.00%+6+11.3%Added
Bruce G. Allen Investments, LLC60$2.42K0.00%+38+172.7%Added
DT Investment Partners, LLC62$2.50K0.00%00.0%Unchanged
Manchester Capital Management LLC64$2.58K0.00%+28+77.8%Added
Pinnacle Bancorp, Inc.65$2.62K0.00%+65New
Whipplewood Advisors, LLC65$2.62K0.00%+65New
Intentional Wealth Strategies, LLC66$2.66K0.00%+66New
Bell Investment Advisors, Inc69$2.78K0.00%−12−14.8%Reduced
TD Capital Management LLC73$2.94K0.00%+73New
Farmers & Merchants Trust Co of Chambersburg PA64$3.00K0.00%00.0%Unchanged
Dogwood Wealth Management LLC77$3.11K0.00%−32−29.4%Reduced
Clayton Financial Group LLC77$3.11K0.00%00.0%Unchanged
Quent Capital, LLC82$3.31K0.00%−56−40.6%Reduced
Raffa Wealth Management, LLC82$3.31K0.00%+1+1.2%Added
Cromwell Holdings LLC84$3.39K0.00%−871−91.2%Reduced
MTM Investment Management, LLC93$3.75K0.00%00.0%Unchanged
Essential Partners LLC94$3.79K0.00%−320−77.3%Reduced
Principia Wealth Advisory, LLC94$3.79K0.00%+30+46.9%Added
Kilter Group LLC94$3.79K0.00%+60+176.5%Added
Twin Peaks Wealth Advisors, LLC94$3.79K0.00%+94New
Red Tortoise LLC98$3.95K0.00%+48+96.0%Added
Smithfield Trust Co90$4.00K0.00%00.0%Unchanged
First United Bank Trust100$4.03K0.00%00.0%Unchanged
Orion Capital Management LLC100$4.03K0.00%00.0%Unchanged
Vanguard National Trust Co100$4.03K0.00%+100New
Aventura Private Wealth, LLC102$4.12K0.00%−20−16.4%Reduced
JPL Wealth Management, LLC104$4.20K0.00%+104New
Financial Network Wealth Advisors LLC110$4.44K0.00%−320−74.4%Reduced
Arlington Trust Co LLC110$4.44K0.00%00.0%Unchanged