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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.

13F holders, Q2 2021

Institutional positions in Costar Group, Inc. as of Jun 30, 2021. 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
607
+19 vs. Q1 2021
Shares held
375.3M
+1.70M (+0.5%) vs. Q1 2021Converted for a 10-for-1 split
Total value
$31.1B
+$378.3M (+1.2%) vs. Q1 2021
New holders
86
229 more added
Sold out
67
172 more reduced

5 institutions that held it in Q1 2021 haven't filed for Q2 2021 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q1 2021: 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 2021: 607 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: 768 institutionsQ3 2024: 775 institutionsQ4 2024: 808 institutionsQ1 2025: 861 institutionsQ2 2025: 876 institutionsQ3 2025: 909 institutionsQ4 2025: 851 institutionsQ1 2026: 801 institutionsQ2 2026: 764 institutions
Value heldQ2 2021: $31.1B
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 2026764$11.7B
Q1 2026801$16.8B
Q4 2025851$28.4B
Q3 2025909$34.9B
Q2 2025876$34.2B
Q1 2025861$33.9B
Q4 2024808$28.9B
Q3 2024775$30.0B
Q2 2024768$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 2021

Shares, value and share of portfolio for each institution holding Costar Group, Inc.; share changes are against Q1 2021.

Institutions holding CSGP in Q2 2021
InstitutionSharesValue% of portfolioChange in sharesAction
Price T Rowe Associates Inc43,681,083$3.62B0.34%+1,306,713+3.1%AddedConverted for a 10-for-1 split
Vanguard Group Inc34,639,833$2.87B0.07%00.0%UnchangedConverted for a 10-for-1 split
BlackRock Inc.25,891,949$2.14B0.06%−4,631,971−15.2%ReducedConverted for a 10-for-1 split
Bamco Inc18,793,260$1.56B3.57%−609,330−3.1%ReducedConverted for a 10-for-1 split
Principal Financial Group Inc15,169,117$1.26B0.81%+5,626,637+59.0%AddedConverted for a 10-for-1 split
Baillie Gifford & Co12,000,170$993.9M0.48%+525,820+4.6%AddedConverted for a 10-for-1 split
Janus Henderson Group PLC11,717,971$970.5M0.42%−3,314,729−22.1%ReducedConverted for a 10-for-1 split
Franklin Resources Inc10,733,810$889.0M0.34%+245,040+2.3%AddedConverted for a 10-for-1 split
Akre Capital Management LLCSuperinvestorAkre Capital Management9,767,600$809.0M4.98%00.0%UnchangedConverted for a 10-for-1 split
Sands Capital Management, LLC9,023,512$747.3M1.27%−79,838−0.9%ReducedConverted for a 10-for-1 split
Massachusetts Financial Services Co8,554,540$708.5M0.21%−127,560−1.5%ReducedConverted for a 10-for-1 split
State Street Corp8,373,033$693.5M0.04%+669,233+8.7%AddedConverted for a 10-for-1 split
Vulcan Value Partners, LLC7,108,452$588.7M3.19%+472,702+7.1%AddedConverted for a 10-for-1 split
Third Point LLCSuperinvestorThird Point5,671,000$469.7M2.75%+171,000+3.1%AddedConverted for a 10-for-1 split
Geode Capital Management, LLC4,939,735$408.5M0.06%+187,535+3.9%AddedConverted for a 10-for-1 split
Wellington Management Group LLP4,826,473$399.7M0.07%−64,097−1.3%ReducedConverted for a 10-for-1 split
Veritas Asset Management LLP4,424,810$366.5M2.05%−403,000−8.3%ReducedConverted for a 10-for-1 split
Alkeon Capital Management LLC3,839,840$318.0M1.13%00.0%UnchangedConverted for a 10-for-1 split
Norges Bank3,823,400$316.7M0.07%+107,350+2.9%AddedConverted for a 10-for-1 split
Macquarie Group Ltd3,775,184$312.7M0.26%+3,764,944+36,767.0%AddedConverted for a 10-for-1 split
Ownership Capital B.V.3,525,580$292.0M3.40%+85,630+2.5%AddedConverted for a 10-for-1 split
Bank of America Corp3,373,554$279.4M0.03%+400,864+13.5%AddedConverted for a 10-for-1 split
Findlay Park Partners LLP3,347,610$277.2M1.89%−226,040−6.3%ReducedConverted for a 10-for-1 split
Winslow Capital Management, LLC3,232,335$267.7M1.04%+762,065+30.8%AddedConverted for a 10-for-1 split
Bares Capital Management, Inc.3,186,570$263.9M4.69%−161,010−4.8%ReducedConverted for a 10-for-1 split
Northern Trust Corp2,810,345$232.8M0.04%−98,185−3.4%ReducedConverted for a 10-for-1 split
Ameriprise Financial Inc2,788,235$230.9M0.07%+575,775+26.0%AddedConverted for a 10-for-1 split
Federated Hermes, Inc.2,679,203$221.9M0.41%−64,887−2.4%ReducedConverted for a 10-for-1 split
Blair William & Co2,675,366$221.6M0.77%+48,906+1.9%AddedConverted for a 10-for-1 split
Riverbridge Partners LLC2,519,018$208.6M2.12%+101,958+4.2%AddedConverted for a 10-for-1 split
Putnam Investments LLC2,485,386$205.8M0.32%+248,176+11.1%AddedConverted for a 10-for-1 split
DF Dent & Co Inc2,297,160$190.3M2.02%+19,450+0.9%AddedConverted for a 10-for-1 split
Fred Alger Management, LLC2,230,211$184.7M0.44%−770,619−25.7%ReducedConverted for a 10-for-1 split
Legal & General Group Plc2,209,790$183.0M0.06%−200,780−8.3%ReducedConverted for a 10-for-1 split
Voya Investment Management LLC2,062,846$170.8M0.33%−48,644−2.3%ReducedConverted for a 10-for-1 split
Bank of New York Mellon Corp1,926,303$159.5M0.03%00.0%UnchangedConverted for a 10-for-1 split
FMR LLC1,732,442$143.5M0.01%−2,275,338−56.8%ReducedConverted for a 10-for-1 split
Ensign Peak Advisors, Inc1,728,990$143.2M0.29%−113,320−6.2%ReducedConverted for a 10-for-1 split
Millennium Management LLC1,715,386$142.1M0.18%−228,654−11.8%ReducedConverted for a 10-for-1 split
Wells Fargo & Company1,648,829$136.6M0.03%−1,292,371−43.9%ReducedConverted for a 10-for-1 split
Swiss National Bank1,606,090$133.0M0.08%+90,090+5.9%AddedConverted for a 10-for-1 split
Goldman Sachs Group Inc1,588,254$131.5M0.04%+444,764+38.9%AddedConverted for a 10-for-1 split
Invesco Ltd.1,566,663$129.8M0.03%−1,006,357−39.1%ReducedConverted for a 10-for-1 split
Victory Capital Management Inc1,552,642$128.6M0.12%+28,622+1.9%AddedConverted for a 10-for-1 split
Nuveen Asset Management, LLC1,520,788$126.0M0.04%−290,182−16.0%ReducedConverted for a 10-for-1 split
Echo Street Capital Management LLC1,462,062$121.1M0.93%+203,582+16.2%AddedConverted for a 10-for-1 split
Granahan Investment Management Inc1,356,430$112.3M2.09%−30,250−2.2%ReducedConverted for a 10-for-1 split
Sumitomo Mitsui Trust Holdings, Inc.1,332,428$110.4M0.07%−368,612−21.7%ReducedConverted for a 10-for-1 split
JPMorgan Chase & Co1,309,200$108.4M0.01%+28,860+2.3%AddedConverted for a 10-for-1 split
APG Asset Management N.V.1,542,970$107.8M0.18%−51,540−3.2%ReducedConverted for a 10-for-1 split
TD Asset Management Inc1,211,612$107.7M0.11%+76,762+6.8%AddedConverted for a 10-for-1 split
Morgan Stanley1,239,358$102.6M0.01%+757,738+157.3%AddedConverted for a 10-for-1 split
Charles Schwab Investment Management Inc1,234,710$102.3M0.03%+33,990+2.8%AddedConverted for a 10-for-1 split
UBS Asset Management Americas Inc1,227,801$101.7M0.04%−164,339−11.8%ReducedConverted for a 10-for-1 split
Kayne Anderson Rudnick Investment Management LLC1,189,967$98.6M0.24%00.0%UnchangedConverted for a 10-for-1 split
Korea Investment CORP1,176,970$97.5M0.28%−83,320−6.6%ReducedConverted for a 10-for-1 split
Amundi1,149,394$95.2M0.07%+1,149,394New
CIBC Private Wealth Group, LLC1,104,437$91.5M0.21%−378,093−25.5%ReducedConverted for a 10-for-1 split
Pelham Capital Ltd.1,100,340$91.1M5.39%−985,020−47.2%ReducedConverted for a 10-for-1 split
Teacher Retirement System of Texas1,064,850$88.2M0.49%+7,710+0.7%AddedConverted for a 10-for-1 split
TimesSquare Capital Management, LLC1,044,300$86.5M0.71%+33,150+3.3%AddedConverted for a 10-for-1 split
Envestnet Asset Management Inc1,034,312$85.7M0.05%+119,062+13.0%AddedConverted for a 10-for-1 split
Jennison Associates LLC1,003,442$83.1M0.06%+665,972+197.3%AddedConverted for a 10-for-1 split
Champlain Investment Partners, LLC994,600$82.4M0.39%+994,600New
American Century Companies Inc922,369$76.4M0.05%+150,729+19.5%AddedConverted for a 10-for-1 split
Weitz Investment Management, Inc.SuperinvestorWeitz Investment Management899,500$74.5M3.14%+65,000+7.8%AddedConverted for a 10-for-1 split
William Blair Investment Management, LLC885,896$73.4M0.23%−22,174−2.4%ReducedConverted for a 10-for-1 split
Baird Financial Group, Inc.869,019$72.0M0.19%+80,409+10.2%AddedConverted for a 10-for-1 split
Dimensional Fund Advisors LP842,757$69.8M0.02%+22,197+2.7%AddedConverted for a 10-for-1 split
Rathbone Brothers plc829,090$68.7M0.76%00.0%UnchangedConverted for a 10-for-1 split
Mitsubishi UFJ Trust & Banking Corp823,520$68.2M0.14%−54,730−6.2%ReducedConverted for a 10-for-1 split
California Public Employees Retirement System799,280$66.2M0.05%−15,460−1.9%ReducedConverted for a 10-for-1 split
Senator Investment Group LP750,000$62.1M1.18%−450,000−37.5%ReducedConverted for a 10-for-1 split
Parametric Portfolio Associates LLC741,751$61.4M0.03%+16,161+2.2%AddedConverted for a 10-for-1 split
Holocene Advisors, LP736,187$61.0M0.37%+736,187New
American Capital Management Inc711,964$59.0M1.65%+4,054+0.6%AddedConverted for a 10-for-1 split
California State Teachers Retirement System703,927$58.3M0.07%−32,613−4.4%ReducedConverted for a 10-for-1 split
Citadel Advisors LLC657,599$54.5M0.06%+474,999+260.1%AddedConverted for a 10-for-1 split
Wildcat Capital Management, LLC653,820$54.1M6.14%−46,050−6.6%ReducedConverted for a 10-for-1 split
Ci Investments Inc.628,095$52.0M0.19%+163,195+35.1%AddedConverted for a 10-for-1 split
STRS Ohio611,030$50.6M0.18%−9,410−1.5%ReducedConverted for a 10-for-1 split
Peregrine Capital Management LLC589,960$48.9M0.88%+27,040+4.8%AddedConverted for a 10-for-1 split
SEI Investments Co580,895$48.3M0.11%+73,395+14.5%AddedConverted for a 10-for-1 split
Citigroup Inc577,582$47.8M0.04%+66,082+12.9%AddedConverted for a 10-for-1 split
Geneva Capital Management LLC573,588$47.5M0.77%−18,382−3.1%ReducedConverted for a 10-for-1 split
Barclays PLC563,397$46.7M0.04%+251,987+80.9%AddedConverted for a 10-for-1 split
National Pension Service557,450$46.2M0.09%00.0%UnchangedConverted for a 10-for-1 split
New York State Common Retirement Fund551,280$45.7M0.05%−43,630−7.3%ReducedConverted for a 10-for-1 split
State Board of Administration of Florida Retirement System524,430$43.4M0.08%−25,600−4.7%ReducedConverted for a 10-for-1 split
Balyasny Asset Management LLC520,261$43.1M0.24%+520,261New
Segall Bryant & Hamill, LLC509,541$42.2M0.41%−1,125,919−68.8%ReducedConverted for a 10-for-1 split
Raymond James & Associates504,772$41.8M0.04%+189,702+60.2%AddedConverted for a 10-for-1 split
Capital World Investors500,000$41.4M0.01%00.0%UnchangedConverted for a 10-for-1 split
Stephens Investment Management Group LLC481,126$39.8M0.55%−8,964−1.8%ReducedConverted for a 10-for-1 split
Chicago Capital, LLC472,388$39.1M1.53%00.0%UnchangedConverted for a 10-for-1 split
Alberta Investment Management Corp470,000$38.9M0.32%+294,000+167.0%AddedConverted for a 10-for-1 split
Truist Financial Corp460,284$38.1M0.06%+28,514+6.6%AddedConverted for a 10-for-1 split
Voloridge Investment Management, LLC456,754$37.8M0.26%−91,456−16.7%ReducedConverted for a 10-for-1 split
Neuberger Berman Group LLC437,800$36.2M0.03%+35,010+8.7%AddedConverted for a 10-for-1 split
Kornitzer Capital Management Inc426,290$35.3M0.53%00.0%UnchangedConverted for a 10-for-1 split