Institutional Ownership
Mediaalpha Inc
CUSIP 58450V104CL AMAXQ1 2026
13D / 13G Filings
44
Schedule 13D/13G on record
Beneficial Filers
14
Distinct reporting persons
Largest Stake
61.9%
Max % of class reported
Institutional Holders
155
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
44 filings · latest Nov 12, 2025
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Nov 12, 2025 | Insignia Capital Partners Gp, L.L.C. | 13G/A | 11.0% | — | SEC |
| 2 | Oct 31, 2025 | The Vanguard Group | 13G/A | 4.6% | 2.60M | SEC |
| 3 | Aug 8, 2025 | White Mountains Insurance Group, Ltd. | 13D/A | 31.7% | — | SEC |
| 4 | Apr 30, 2025 | The Vanguard Group | 13G/A | 5.3% | 2.91M | SEC |
| 5 | Apr 29, 2025 | Blackrock, Inc. | 13G/A | 4.2% | 2.33M | SEC |
| 6 | Feb 28, 2025 | Eugene Nonko | 13D/A | 10.8% | — | SEC |
| 7 | Nov 12, 2024 | Blackrock, Inc. | 13G | 6.9% | 3.77M | SEC |
| 8 | Nov 12, 2024 | Insignia Capital Partners Gp, L.L.C. | 13G/A | 5.5% | 3.23M | SEC |
| 9 | Nov 12, 2024 | Vanguard Group Inc | 13G/A | 6.3% | 3.45M | SEC |
| 10 | Nov 4, 2024 | Vanguard Group Inc | 13G/A | 6.3% | 3.45M | SEC |
34 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Mediaalpha Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | White Mountains Insurance Group Ltd | 17.86M | $166.07M |
| 2 | Blackrock, Inc. | 3.48M | $32.33M |
| 3 | Clearline Capital LP | 2.59M | $24.09M |
| 4 | Jpmorgan Chase & Co | 1.75M | $16.48M |
| 5 | J. Goldman & Co LP | 1.18M | $11.00M |
| 6 | Geode Capital Management, LLC | 1.07M | $9.95M |
| 7 | Arrowstreet Capital, Limited Partnership | 1.06M | $9.88M |
| 8 | Jacobs Asset Management, LLC | 924.4K | $8.60M |
| 9 | State Street Corp | 838.2K | $7.79M |
| 10 | Shay Capital LLC | 775.0K | $7.21M |