ARLINGTON, VA
COSTAR GROUP, INC.CSGP— Latest position per institution from SEC 13F filings
15
Institutional holders
377.17M
Total shares held
14.99B
Estimated value
18.86M
Avg. position size
VANGUARD GROUP INC
CIK 102909
Shares
70.11M
Value
4.71B
Filed
Dec 31, 2025
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
38.56M
Value
2.86B
Filed
Jun 30, 2024
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
37.91M
Value
1.07B
Filed
Jun 30, 2026
BLACKROCK, INC.
CIK 2012383
Shares
33.81M
Value
957.61M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
26.68M
Value
755.68M
Filed
Jun 30, 2026
BAMCO INC /NY/
CIK 1017918
Shares
21.63M
Value
612.47M
Filed
Jun 30, 2026
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM
CIK 1081019
Shares
19.28M
Value
680.68K
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
18.41M
Value
521.40M
Filed
Jun 30, 2026
CAPITAL INTERNATIONAL INVESTORS
CIK 1562230
Shares
16.64M
Value
471.33M
Filed
Jun 30, 2026
BAILLIE GIFFORD & CO
CIK 1088875
Shares
13.15M
Value
372.53M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
12.17M
Value
343.30M
Filed
Jun 30, 2026
AKRE CAPITAL MANAGEMENT LLC
CIK 1112520
Shares
11.70M
Value
331.33M
Filed
Jun 30, 2026
POLEN CAPITAL MANAGEMENT LLC
CIK 1034524
Shares
8.76M
Value
248.06M
Filed
Jun 30, 2026
AQR CAPITAL MANAGEMENT LLC
CIK 1167557
Shares
8.45M
Value
239.18M
Filed
Jun 30, 2026
JUPITER TOPCO LLC
CIK 2146052
Shares
7.83M
Value
221.83M
Filed
Jun 30, 2026
JANUS HENDERSON GROUP LTD.
CIK 1274173
Shares
7.72M
Value
311.59M
Filed
Mar 31, 2026
INVESCO LTD.
CIK 914208
Shares
6.81M
Value
192.81M
Filed
Jun 30, 2026
EDGEPOINT INVESTMENT GROUP INC.
CIK 1481669
Shares
5.95M
Value
168.50M
Filed
Jun 30, 2026
NORGES BANK
CIK 1374170
Shares
5.95M
Value
168.50M
Filed
Jun 30, 2026
ARTISAN PARTNERS LIMITED PARTNERSHIP
CIK 1466153
Shares
5.64M
Value
425.14M
Filed
Sep 30, 2024
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | 102909 | 70.11M | 4.71B | Dec 31, 2025 |
| 2 | BLACKROCK FINANCE, INC. | 1364742 | 38.56M | 2.86B | Jun 30, 2024 |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 37.91M | 1.07B | Jun 30, 2026 |
| 4 | BLACKROCK, INC. | 2012383 | 33.81M | 957.61M | Jun 30, 2026 |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 26.68M | 755.68M | Jun 30, 2026 |
| 6 | BAMCO INC /NY/ | 1017918 | 21.63M | 612.47M | Jun 30, 2026 |
| 7 | CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 1081019 | 19.28M | 680.68K | Jun 30, 2026 |
| 8 | STATE STREET CORP | 93751 | 18.41M | 521.40M | Jun 30, 2026 |
| 9 | CAPITAL INTERNATIONAL INVESTORS | 1562230 | 16.64M | 471.33M | Jun 30, 2026 |
| 10 | BAILLIE GIFFORD & CO | 1088875 | 13.15M | 372.53M | Jun 30, 2026 |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 12.17M | 343.30M | Jun 30, 2026 |
| 12 | AKRE CAPITAL MANAGEMENT LLC | 1112520 | 11.70M | 331.33M | Jun 30, 2026 |
| 13 | POLEN CAPITAL MANAGEMENT LLC | 1034524 | 8.76M | 248.06M | Jun 30, 2026 |
| 14 | AQR CAPITAL MANAGEMENT LLC | 1167557 | 8.45M | 239.18M | Jun 30, 2026 |
| 15 | JUPITER TOPCO LLC | 2146052 | 7.83M | 221.83M | Jun 30, 2026 |
| 16 | JANUS HENDERSON GROUP LTD. | 1274173 | 7.72M | 311.59M | Mar 31, 2026 |
| 17 | INVESCO LTD. | 914208 | 6.81M | 192.81M | Jun 30, 2026 |
| 18 | EDGEPOINT INVESTMENT GROUP INC. | 1481669 | 5.95M | 168.50M | Jun 30, 2026 |
| 19 | NORGES BANK | 1374170 | 5.95M | 168.50M | Jun 30, 2026 |
| 20 | ARTISAN PARTNERS LIMITED PARTNERSHIP | 1466153 | 5.64M | 425.14M | Sep 30, 2024 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.