Mediaalpha Inc. Class AMAX
13F holders, Q4 2025 (December 31)172holders +15
32new positions
18sold out
8famous investors
$12.95avg. 13F price*
At the end of Q4 2025, 172 institutions reported holding Mediaalpha Inc. Class A (MAX) in their 13F filings, up 15 from Q3 2025. 32 opened new positions and 18 sold out. The largest holders were White Mountains Insurance Group Ltd. ($231.2M), BlackRock, Inc. ($46.0M) and Vanguard Group Inc. ($33.3M). 8 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio).
- Company
- Mediaalpha Inc. Class A
- CUSIP
- 58450V104
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 32 | $15.5M |
| Exits | 18 | $30.3M |
All 13F filers, Q3 2025 → Q4 2025: 4,828,928 shares bought and 5,329,174 shares sold, net −500,246 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 172 holders
| White Mountains Insurance Group Ltd. | 88.28% | No change | 17,856,614 | $231.2M |
| BlackRock, Inc. | 0.00% | Reduce -0.6% | 3,551,465 | $46.0M |
| Vanguard Group Inc. | 0.00% | Reduce -1.1% | 2,570,992 | $33.3M |
| JPMorgan Chase & Co. | 0.00% | Add +29.2% | 1,367,896 | $17.7M |
| Clearline Capital LP | 1.27% | Add +0.8% | 1,301,453 | $16.9M |
| Renaissance Technologies | 0.02% | Add +10.6% | 1,045,400 | $13.5M |
| Morgan Stanley | 0.00% | Add +10.1% | 960,154 | $12.4M |
| Arrowstreet Capital, Limited Partnership | 0.01% | Add +64.5% | 855,904 | $11.1M |
| Divisadero Street Capital Management, LP | 0.63% | Add +876.9% | 849,011 | $11.0M |
| AQR Capital Management | 0.01% | Add +4.3% | 804,095 | $10.4M |
| J. Goldman & Co LP | 0.40% | Add +48.1% | 786,369 | $10.2M |
| Geode Capital Management, LLC | 0.00% | Add +1.0% | 777,304 | $10.1M |
| Millennium Management | 0.01% | Reduce -47.4% | 751,745 | $9.7M |
| State Street Corp. | 0.00% | Add +8.8% | 731,407 | $9.5M |
| Victory Capital Management Inc. | 0.01% | Add +2.6% | 729,457 | $9.4M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -43.0% | 729,367 | $9.4M |
| Jacobs Asset Management, LLC | 5.09% | Reduce -13.9% | 705,299 | $9.1M |
| Jacobs Levy Equity Management, Inc. | 0.04% | Add +24.9% | 700,497 | $9.1M |
| Nuveen, LLC | 0.00% | Reduce -3.5% | 666,539 | $8.6M |
| Acadian Asset Management LLC | 0.01% | Add +44.4% | 606,171 | $7.8M |
| Shay Capital LLC | 1.24% | Reduce -25.2% | 591,000 | $7.7M |
| G2 Investment Partners Management LLC | 1.53% | Add +32.3% | 496,916 | $6.4M |
| D. E. Shaw & Co. | 0.00% | Reduce -12.6% | 397,380 | $5.1M |
| Jane Street Group, LLC | 0.01% | Add +104.3% | 360,129 | $4.7M |
| Franklin Resources Inc. | 0.00% | Add +3.4% | 328,712 | $4.3M |
| Marshall Wace, LLP | 0.00% | Add +79.7% | 328,388 | $4.3M |
| Dimensional Fund Advisors LP | 0.00% | Add +169.4% | 319,798 | $4.1M |
| Qube Research & Technologies Ltd | 0.01% | Reduce -43.7% | 284,012 | $3.7M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +0.0% | 279,817 | $3.6M |
| Triad Investment Management | 3.61% | — | 275,437 | $3.6M |
| BNP Paribas Financial Markets | 0.00% | Add +41.1% | 273,151 | $3.5M |
| Northern Trust Corp. | 0.00% | Reduce -7.1% | 267,278 | $3.5M |
| Janus Henderson Group PLC | 0.00% | Reduce -31.1% | 265,906 | $3.4M |
| Pacer Advisors, Inc. | 0.01% | Add +6.7% | 263,024 | $3.4M |
| Y-Intercept (Hong Kong) Ltd | 0.06% | Add +1.3% | 210,352 | $2.7M |
| Stoic Point Capital Management LLC | 2.28% | — | 207,298 | $2.7M |
| Balyasny Asset Management L.P. | 0.00% | New | 184,159 | $2.4M |
| Citadel Advisors | 0.00% | New | 169,647 | $2.2M |
| PDT Partners, LLC | 0.14% | No change | 165,540 | $2.1M |
| Canada Pension Plan Investment Board | 0.00% | Add +4.5% | 136,500 | $1.8M |
| Squarepoint Ops LLC | 0.00% | Add +305.4% | 124,288 | $1.6M |
| Man Group plc | 0.00% | New | 110,876 | $1.4M |
| HRT Financial LP | 0.00% | New | 109,023 | $1.4M |
| Boothbay Fund Management, LLC | 0.04% | Add +53.0% | 108,143 | $1.4M |
| Barclays PLC | 0.00% | Add +6.5% | 91,424 | $1.2M |
| Russell Investments Group, Ltd. | 0.00% | Add +75.9% | 90,843 | $1.2M |
| XTX Topco Ltd | 0.03% | Add +212.0% | 90,702 | $1.2M |
| Ieq Capital, LLC | 0.00% | Add +10.8% | 88,136 | $1.1M |
| Bank of New York Mellon Corp | 0.00% | Reduce -11.9% | 87,312 | $1.1M |
| Tudor Investment Corporation | 0.01% | New | 83,330 | $1.1M |
| Nomura Holdings Inc. | 0.00% | Add +55.4% | 82,313 | $1.1M |
| Lighthouse Investment Partners, LLC | 0.04% | Reduce -76.8% | 82,050 | $1.1M |
| Sei Investments Co. | 0.00% | Add +30.5% | 81,844 | $1.1M |
| ExodusPoint Capital Management, LP | 0.01% | New | 81,791 | $1.1M |
| Susquehanna International Group, LLP | 0.00% | Add +26.2% | 80,990 | $1.0M |
| Globeflex Capital L P | 0.16% | New | 80,233 | $1.0M |
| Allianz Asset Management GmbH | 0.00% | No change | 70,176 | $909K |
| Mariner, LLC | 0.00% | Add +12.9% | 69,891 | $905K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -30.9% | 72,285 | $884K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Reduce -8.9% | 65,085 | $843K |
| Blair William & Co. | 0.00% | Reduce -9.1% | 60,146 | $779K |
| Two Sigma Investments, LP | 0.00% | Add +165.8% | 59,860 | $775K |
| UBS Group AG | 0.00% | Reduce -56.8% | 59,689 | $773K |
| Swiss National Bank | 0.00% | No change | 58,700 | $760K |
| Amundi | 0.00% | New | 58,616 | $759K |
| Bank of America Corp. | 0.00% | Reduce -29.1% | 58,164 | $753K |
| Raymond James Financial Inc. | 0.00% | Add +27.3% | 52,708 | $683K |
| Rhumbline Advisers | 0.00% | Reduce -9.5% | 48,522 | $628K |
| State of Wisconsin Investment Board | 0.00% | Add +50.2% | 46,842 | $607K |
| Gsa Capital Partners LLP | 0.05% | New | 46,784 | $606K |
| Mackenzie Financial Corp. | 0.00% | Add +184.3% | 42,975 | $559K |
| Quantinno Capital Management LP | 0.00% | Add +147.8% | 42,748 | $554K |
| Cwm, LLC | 0.00% | Add +10.2% | 42,278 | $548K |
| Allspring Global Investments Holdings, LLC | 0.00% | Add +9.6% | 42,950 | $513K |
| Verition Fund Management LLC | 0.00% | Reduce -4.7% | 39,303 | $509K |
| Gotham Asset Management | 0.00% | Reduce -7.8% | 39,123 | $507K |
| State of Wyoming | 0.06% | Reduce -16.0% | 38,832 | $503K |
| AlphaQuest LLC | 0.03% | Add +280.0% | 37,463 | $485K |
| Wells Fargo & Company | 0.00% | Add +81.2% | 37,072 | $480K |
| Thrivent Financial for Lutherans | 0.00% | New | 36,379 | $471K |
| Principal Financial Group Inc. | 0.00% | Add +43.2% | 35,403 | $458K |
| PharVision Advisers, LLC | 0.22% | Add +39.0% | 34,034 | $441K |
| Alliancebernstein L.P. | 0.00% | Reduce -12.2% | 33,930 | $439K |
| Legal & General Group Plc | 0.00% | Reduce -0.3% | 33,817 | $438K |
| Deutsche Bank AG | 0.00% | Add +4.0% | 31,640 | $410K |
| T. Rowe Price Associates Inc. | 0.00% | Add +7.8% | 31,014 | $402K |
| Versor Investments LP | 0.06% | New | 29,318 | $380K |
| Two Sigma Advisers, LP | 0.00% | Add +31.8% | 26,896 | $348K |
| Fox Run Management, L.L.C. | 0.05% | New | 26,035 | $337K |
| Invesco Ltd. | 0.00% | Add +32.1% | 26,024 | $337K |
| Cannell & Spears LLC | 0.01% | Reduce -0.6% | 25,550 | $331K |
| California State Teachers Retirement System | 0.00% | Reduce -16.0% | 25,504 | $330K |
| Creative Planning | 0.00% | Add +29.4% | 25,272 | $327K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +30.8% | 26,437 | $313K |
| Graham Capital Management, L.P. | 0.01% | New | 23,427 | $303K |
| Brookwood Investment Group LLC | 0.04% | New | 22,841 | $296K |
| Mangrove Partners Im, LLC | 0.02% | New | 22,700 | $294K |
| MetLife Investment Management, LLC | 0.00% | No change | 21,402 | $277K |
| Cerity Partners LLC | 0.00% | Reduce -24.8% | 20,777 | $269K |
| Point72 Asset Management | 0.00% | New | 18,751 | $243K |
"% of holder's portfolio" is MAX's weight in each manager's 13F, not the share of Mediaalpha Inc. Class A the manager owns.