MAGNITE, INC.MGNI— Latest position per institution from SEC 13F filings
15
Institutional holders
116.58M
Total shares held
2.06B
Estimated value
5.83M
Avg. position size
VANGUARD GROUP INC
CIK 102909
Shares
14.80M
Value
240.25M
Filed
Dec 31, 2025
BLACKROCK, INC.
CIK 2012383
Shares
12.71M
Value
241.30M
Filed
Jun 30, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
9.70M
Value
128.91M
Filed
Jun 30, 2024
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
8.20M
Value
155.58M
Filed
Jun 30, 2026
FMR LLC
CIK 315066
Shares
7.76M
Value
147.27M
Filed
Jun 30, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
6.23M
Value
118.15M
Filed
Jun 30, 2026
WELLINGTON MANAGEMENT GROUP LLP
CIK 902219
Shares
6.04M
Value
114.72M
Filed
Jun 30, 2026
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
5.26M
Value
99.84M
Filed
Jun 30, 2026
BOSTON PARTNERS
CIK 1386060
Shares
5.01M
Value
95.85M
Filed
Jun 30, 2026
AMERICAN CENTURY COMPANIES INC
CIK 748054
Shares
4.62M
Value
87.74M
Filed
Jun 30, 2026
RUBRIC CAPITAL MANAGEMENT LP
CIK 1687509
Shares
4M
Value
30.16M
Filed
Sep 30, 2023
NUVEEN ASSET MANAGEMENT, LLC
CIK 1521019
Shares
3.94M
Value
62.77M
Filed
Dec 31, 2024
CAPITAL RESEARCH GLOBAL INVESTORS
CIK 1422848
Shares
3.87M
Value
73.44M
Filed
Jun 30, 2026
NUVEEN, LLC
CIK 1871926
Shares
3.79M
Value
72.03M
Filed
Jun 30, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
3.79M
Value
71.95M
Filed
Jun 30, 2026
EDENBROOK CAPITAL, LLC
CIK 1666682
Shares
3.56M
Value
67.49M
Filed
Jun 30, 2026
STATE STREET CORP
CIK 93751
Shares
3.53M
Value
66.96M
Filed
Jun 30, 2026
325 CAPITAL LLC
CIK 1873893
Shares
3.41M
Value
64.77M
Filed
Jun 30, 2026
NINE TEN CAPITAL MANAGEMENT LLC
CIK 1635236
Shares
3.26M
Value
61.90M
Filed
Jun 30, 2026
GRANAHAN INVESTMENT MANAGEMENT, LLC
CIK 1026710
Shares
3.08M
Value
58.52M
Filed
Jun 30, 2026
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | 102909 | 14.80M | 240.25M | Dec 31, 2025 |
| 2 | BLACKROCK, INC. | 2012383 | 12.71M | 241.30M | Jun 30, 2026 |
| 3 | BLACKROCK FINANCE, INC. | 1364742 | 9.70M | 128.91M | Jun 30, 2024 |
| 4 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 8.20M | 155.58M | Jun 30, 2026 |
| 5 | FMR LLC | 315066 | 7.76M | 147.27M | Jun 30, 2026 |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 6.23M | 118.15M | Jun 30, 2026 |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | 902219 | 6.04M | 114.72M | Jun 30, 2026 |
| 8 | DIMENSIONAL FUND ADVISORS LP | 354204 | 5.26M | 99.84M | Jun 30, 2026 |
| 9 | BOSTON PARTNERS | 1386060 | 5.01M | 95.85M | Jun 30, 2026 |
| 10 | AMERICAN CENTURY COMPANIES INC | 748054 | 4.62M | 87.74M | Jun 30, 2026 |
| 11 | RUBRIC CAPITAL MANAGEMENT LP | 1687509 | 4M | 30.16M | Sep 30, 2023 |
| 12 | NUVEEN ASSET MANAGEMENT, LLC | 1521019 | 3.94M | 62.77M | Dec 31, 2024 |
| 13 | CAPITAL RESEARCH GLOBAL INVESTORS | 1422848 | 3.87M | 73.44M | Jun 30, 2026 |
| 14 | NUVEEN, LLC | 1871926 | 3.79M | 72.03M | Jun 30, 2026 |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 3.79M | 71.95M | Jun 30, 2026 |
| 16 | EDENBROOK CAPITAL, LLC | 1666682 | 3.56M | 67.49M | Jun 30, 2026 |
| 17 | STATE STREET CORP | 93751 | 3.53M | 66.96M | Jun 30, 2026 |
| 18 | 325 CAPITAL LLC | 1873893 | 3.41M | 64.77M | Jun 30, 2026 |
| 19 | NINE TEN CAPITAL MANAGEMENT LLC | 1635236 | 3.26M | 61.90M | Jun 30, 2026 |
| 20 | GRANAHAN INVESTMENT MANAGEMENT, LLC | 1026710 | 3.08M | 58.52M | Jun 30, 2026 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.