ARLINGTON, VA
COSTAR GROUP, INC.CSGP— Latest position per institution from SEC 13F filings
15
Institutional holders
373.45M
Total shares held
18.64B
Estimated value
18.67M
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
38.23M
Value
1.54B
Filed
Mar 31, 2026
BLACKROCK, INC.
CIK 2012383
Shares
33.81M
Value
1.36B
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
27.42M
Value
1.11B
Filed
Mar 31, 2026
STATE STREET CORP
CIK 93751
Shares
18.65M
Value
752.38M
Filed
Mar 31, 2026
PRINCIPAL FINANCIAL GROUP INC
CIK 1126328
Shares
17.70M
Value
713.87M
Filed
Mar 31, 2026
BAMCO INC /NY/
CIK 1017918
Shares
16.31M
Value
658.11M
Filed
Mar 31, 2026
CAPITAL INTERNATIONAL INVESTORS
CIK 1562230
Shares
15.51M
Value
625.82M
Filed
Mar 31, 2026
BAILLIE GIFFORD & CO
CIK 1088875
Shares
13.61M
Value
549.06M
Filed
Mar 31, 2026
POLEN CAPITAL MANAGEMENT LLC
CIK 1034524
Shares
12.57M
Value
507.09M
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
12.45M
Value
500.45M
Filed
Mar 31, 2026
AKRE CAPITAL MANAGEMENT LLC
CIK 1112520
Shares
10.35M
Value
417.45M
Filed
Mar 31, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
9.25M
Value
373.34M
Filed
Mar 31, 2026
JANUS HENDERSON GROUP PLC
CIK 1274173
Shares
7.72M
Value
311.59M
Filed
Mar 31, 2026
INVESCO LTD.
CIK 914208
Shares
7.14M
Value
287.91M
Filed
Mar 31, 2026
NORGES BANK
CIK 1374170
Shares
7.09M
Value
476.76M
Filed
Dec 31, 2025
D. E. SHAW & CO., INC.
CIK 1009207
Shares
5.91M
Value
238.39M
Filed
Mar 31, 2026
ARTISAN PARTNERS LIMITED PARTNERSHIP
CIK 1466153
Shares
5.64M
Value
425.14M
Filed
Sep 30, 2024
MORGAN STANLEY
CIK 895421
Shares
5.41M
Value
218.34M
Filed
Mar 31, 2026
| # | 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 | 38.23M | 1.54B | Mar 31, 2026 |
| 4 | BLACKROCK, INC. | 2012383 | 33.81M | 1.36B | Mar 31, 2026 |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 27.42M | 1.11B | Mar 31, 2026 |
| 6 | STATE STREET CORP | 93751 | 18.65M | 752.38M | Mar 31, 2026 |
| 7 | PRINCIPAL FINANCIAL GROUP INC | 1126328 | 17.70M | 713.87M | Mar 31, 2026 |
| 8 | BAMCO INC /NY/ | 1017918 | 16.31M | 658.11M | Mar 31, 2026 |
| 9 | CAPITAL INTERNATIONAL INVESTORS | 1562230 | 15.51M | 625.82M | Mar 31, 2026 |
| 10 | BAILLIE GIFFORD & CO | 1088875 | 13.61M | 549.06M | Mar 31, 2026 |
| 11 | POLEN CAPITAL MANAGEMENT LLC | 1034524 | 12.57M | 507.09M | Mar 31, 2026 |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 12.45M | 500.45M | Mar 31, 2026 |
| 13 | AKRE CAPITAL MANAGEMENT LLC | 1112520 | 10.35M | 417.45M | Mar 31, 2026 |
| 14 | GOLDMAN SACHS GROUP INC | 886982 | 9.25M | 373.34M | Mar 31, 2026 |
| 15 | JANUS HENDERSON GROUP PLC | 1274173 | 7.72M | 311.59M | Mar 31, 2026 |
| 16 | INVESCO LTD. | 914208 | 7.14M | 287.91M | Mar 31, 2026 |
| 17 | NORGES BANK | 1374170 | 7.09M | 476.76M | Dec 31, 2025 |
| 18 | D. E. SHAW & CO., INC. | 1009207 | 5.91M | 238.39M | Mar 31, 2026 |
| 19 | ARTISAN PARTNERS LIMITED PARTNERSHIP | 1466153 | 5.64M | 425.14M | Sep 30, 2024 |
| 20 | MORGAN STANLEY | 895421 | 5.41M | 218.34M | Mar 31, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.