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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, Q2 2026

Institutional positions in Costar Group, Inc. as of Jun 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

Institutional holders
760
−28 vs. Q1 2026
Shares held
414.0M
+5.90M (+1.4%) vs. Q1 2026
Total value
$11.7B
−$4.74B (−28.8%) vs. Q1 2026
New holders
115
303 more added
Sold out
143
266 more reduced

9 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q1 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 holdersQ2 2026: 760 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 heldQ2 2026: $11.7B
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, Q2 2026

Shares, value and share of portfolio for each institution holding Costar Group, Inc.; share changes are against Q1 2026.

Institutions holding CSGP in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Evolution Advisers, Inc.1$00.00%+1New
Bay Harbor Wealth Management, LLC1$280.00%−4−80.0%Reduced
Eastern Bank1$280.00%00.0%Unchanged
JFS Wealth Advisors, LLC1$290.00%−29−96.7%Reduced
Maryland Capital Advisors Inc.1$290.00%+1New
Grove Bank & Trust2$570.00%−9,992−100.0%Reduced
Medallion Wealth Advisors, LLC2$570.00%+2New
E Fund Management (Hong Kong) Co., Ltd.3$850.00%−1,550−99.8%Reduced
Kingdom Financial Group LLC.3$850.00%00.0%Unchanged
3 Factor Indexing, LLC3$850.00%+1+50.0%Added
Buck Wealth Strategies, LLC3$850.00%+3New
Vision Financial Markets LLC3$890.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.4$1140.00%−6−60.0%Reduced
CDKV Holdings LLC4$1140.00%00.0%Unchanged
DecisionPoint Financial, LLC4$1180.00%00.0%Unchanged
Cassaday & Co Wealth Management LLC5$1420.00%−15−75.0%Reduced
United Community Bank5$1420.00%00.0%Unchanged
S&T Bank5$1420.00%+5New
Montgomery Financial Services LLC6$1700.00%+6New
American Capital Advisory, LLC7$1990.00%00.0%Unchanged
Dunhill Financial, LLC7$2240.00%−18−72.0%Reduced
Global Trust Asset Management, LLC10$2830.00%00.0%Unchanged
Key Financial Inc10$2830.00%00.0%Unchanged
Motco10$2830.00%+10New
Decker Retirement Planning Inc.10$2830.00%+10New
Acumen Wealth Advisors, LLC10$2840.00%+10New
Valley National Advisers Inc11$3120.00%+11New
Caitlin John, LLC12$3400.00%00.0%Unchanged
MidFirst Bank15$4250.00%+13+650.0%Added
Strengthening Families & Communities, LLC15$4250.00%+15New
Highline Wealth Partners LLC16$4530.00%+4+33.3%Added
NVWM, LLC17$4820.00%−10−37.0%Reduced
TFC Financial Management18$5100.00%+16+800.0%Added
First Horizon Corp19$5380.00%−39−67.2%Reduced
1015 Capital Partners, LLC20$5660.00%+17+566.7%Added
Proathlete Wealth Management LLC21$5940.00%00.0%Unchanged
Creative Capital Management Investments LLC22$6230.00%+22New
Ameriflex Group, Inc.24$6800.00%+23+2,300.0%Added
Thurston, Springer, Miller, Herd & Titak, Inc.25$7070.00%00.0%Unchanged
Hughes Financial Services, LLC27$7650.00%+15+125.0%Added
Purpose Unlimited Inc.30$8490.00%00.0%Unchanged
N.E.W. Advisory Services LLC30$8500.00%00.0%Unchanged
PayPay Securities Corp30$8500.03%+7+30.4%Added
Creative Financial Designs Inc30$8500.00%+30New
Bare Financial Services, Inc33$9350.00%+33New
IFG Advisory, LLC34$9630.00%+34New
Graney & King, LLC35$9910.00%00.0%Unchanged
UMA Financial Services, Inc.35$9920.00%+35New
CKW Financial Group20$1.00K0.00%00.0%Unchanged
Cornerstone Financial Management LLC38$1.08K0.00%−21−35.6%Reduced
Activest Wealth Management39$1.10K0.00%−10−20.4%Reduced
Wolff Wiese Magana LLC40$1.13K0.00%+40New
Country Trust Bank41$1.16K0.00%00.0%Unchanged
AdvisorNet Financial, Inc41$1.16K0.00%+16+64.0%Added
High Note Wealth, LLC43$1.22K0.00%+43New
JPL Wealth Management, LLC49$1.39K0.00%−55−52.9%Reduced
South State Corp.50$1.42K0.00%−184−78.6%Reduced
Gill Capital Partners, LLC50$1.42K0.00%00.0%Unchanged
Signature Resources Capital Management, LLC50$1.42K0.00%00.0%Unchanged
Valued Wealth Advisors LLC50$1.42K0.00%00.0%Unchanged
Rakuten Securities, Inc.50$1.42K0.00%00.0%Unchanged
West Paces Advisors Inc.50$1.42K0.00%+50New
Anchor Investment Management, LLC51$1.44K0.00%+51New
Princeton Global Asset Management LLC51$1.44K0.00%+51New
Ancora Advisors, LLC54$1.53K0.00%−190−77.9%Reduced
Bell Investment Advisors, Inc56$1.59K0.00%−13−18.8%Reduced
North Star Investment Management Corp.56$1.59K0.00%+56New
Lloyd Advisory Services, LLC.57$1.61K0.00%+54+1,800.0%Added
ZRC Wealth Management, LLC59$1.67K0.00%−105−64.0%Reduced
DT Investment Partners, LLC62$1.76K0.00%00.0%Unchanged
Crewe Advisors LLC66$1.87K0.00%+26+65.0%Added
Synergy Investment Management, LLC64$1.91K0.00%+64New
J.Safra Asset Management Corp70$1.98K0.00%+70New
Action Point Financial Planning, LLC72$1.98K0.00%+72New
Farmers & Merchants Trust Co of Chambersburg PA64$2.00K0.00%00.0%Unchanged
Dogwood Wealth Management LLC71$2.01K0.00%−6−7.8%Reduced
Trust Co of Vermont72$2.04K0.00%+72New
TD Capital Management LLC73$2.07K0.00%00.0%Unchanged
Owl Creek Wealth Partners LLC75$2.12K0.00%−270−78.3%Reduced
Heritage Wealth Advisors76$2.15K0.00%−517−87.2%Reduced
Marquette Asset Management, LLC78$2.21K0.00%+67+609.1%Added
Plante Moran Financial Advisors, LLC82$2.32K0.00%+82New
Atlantic Union Bankshares Corp82$2.32K0.00%−1,120−93.2%Reduced
SHP Wealth Management83$2.35K0.00%+77+1,283.3%Added
Beacon Investment Advisory Services, Inc.88$2.49K0.00%+88New
Planning Strategies Inc.90$2.55K0.00%+90New
MTM Investment Management, LLC93$2.63K0.00%00.0%Unchanged
Clear Street Markets LLC95$2.69K0.00%+95New
Raffa Wealth Management, LLC99$2.80K0.00%+17+20.7%Added
First United Bank Trust100$2.83K0.00%00.0%Unchanged
Orion Capital Management LLC100$2.83K0.00%00.0%Unchanged
Vanguard National Trust Co100$2.83K0.00%00.0%Unchanged
HM Payson & Co100$2.83K0.00%+50+100.0%Added
Crews Bank & Trust100$2.83K0.00%+100New
Aventura Private Wealth, LLC102$2.89K0.00%00.0%Unchanged
Continuum Advisory, LLC103$2.92K0.00%+103New
Smithfield Trust Co90$3.00K0.00%00.0%Unchanged
Avion Wealth133$3.00K0.00%+112+533.3%Added
Westfuller Advisors, LLC110$3.12K0.00%−76−40.9%Reduced
Arlington Trust Co LLC110$3.12K0.00%00.0%Unchanged