Mediaalpha Inc. Class AMAX
13F holders, Q1 2026 (March 31)163holders −9
29new positions
41sold out
5famous investors
$9.32avg. 13F price*
At the end of Q1 2026, 163 institutions reported holding Mediaalpha Inc. Class A (MAX) in their 13F filings, down 9 from Q4 2025. 29 opened new positions and 41 sold out. The largest holders were White Mountains Insurance Group Ltd. ($166.1M), BlackRock, Inc. ($32.3M) and Clearline Capital LP ($24.1M). 5 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio), David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Mediaalpha Inc. Class A
- CUSIP
- 58450V104
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 29 | $14.4M |
| Exits | 41 | $24.0M |
All 13F filers, Q4 2025 → Q1 2026: 7,332,748 shares bought and 6,204,958 shares sold, net +1,127,790 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 163 holders
| White Mountains Insurance Group Ltd. | 52.99% | No change | 17,856,614 | $166.1M |
| BlackRock, Inc. | 0.00% | Reduce -2.1% | 3,476,687 | $32.3M |
| Clearline Capital LP | 1.87% | Add +99.1% | 2,590,670 | $24.1M |
| JPMorgan Chase & Co. | 0.00% | Add +27.6% | 1,745,679 | $16.5M |
| Vanguard Capital Management LLC | 0.00% | — | 1,385,729 | $12.9M |
| J. Goldman & Co LP | 0.51% | Add +50.4% | 1,182,673 | $11.0M |
| Geode Capital Management, LLC | 0.00% | Add +37.7% | 1,070,084 | $10.0M |
| Arrowstreet Capital, Limited Partnership | 0.01% | Add +24.1% | 1,061,981 | $9.9M |
| Jacobs Asset Management, LLC | 5.15% | Add +31.1% | 924,443 | $8.6M |
| Acadian Asset Management LLC | 0.01% | Add +39.8% | 847,199 | $7.9M |
| State Street Corp. | 0.00% | Add +14.6% | 838,161 | $7.8M |
| Shay Capital LLC | 1.02% | Add +31.1% | 775,000 | $7.2M |
| Jacobs Levy Equity Management, Inc. | 0.03% | Add +7.1% | 750,054 | $7.0M |
| Renaissance Technologies | 0.01% | Reduce -31.2% | 719,300 | $6.7M |
| Morgan Stanley | 0.00% | Reduce -26.8% | 703,018 | $6.5M |
| Nuveen, LLC | 0.00% | Add +5.2% | 701,399 | $6.5M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -14.5% | 623,421 | $5.8M |
| Dimensional Fund Advisors LP | 0.00% | Add +94.1% | 620,669 | $5.8M |
| Vanguard Portfolio Management LLC | 0.00% | — | 546,745 | $5.1M |
| Speece Thorson Capital Group Inc. | 1.06% | New | 499,011 | $4.6M |
| AQR Capital Management | 0.00% | Reduce -40.1% | 481,951 | $4.5M |
| Philadelphia Financial Management of San Francisco, LLC | 1.43% | New | 480,000 | $4.5M |
| Qube Research & Technologies Ltd | 0.01% | Add +46.2% | 415,280 | $3.9M |
| Franklin Resources Inc. | 0.00% | Add +4.6% | 343,709 | $3.2M |
| D. E. Shaw & Co. | 0.00% | Reduce -13.9% | 342,058 | $3.2M |
| Triad Investment Management | 3.67% | Add +21.2% | 333,864 | $3.1M |
| HRT Financial LP | 0.01% | Add +202.1% | 329,332 | $3.1M |
| Alliancebernstein L.P. | 0.00% | Add +505.5% | 205,440 | $2.7M |
| Jane Street Group, LLC | 0.00% | Reduce -21.4% | 283,008 | $2.6M |
| Bank of America Corp. | 0.00% | Add +380.9% | 279,704 | $2.6M |
| Charles Schwab Investment Management Inc. | 0.00% | Reduce -2.0% | 274,339 | $2.6M |
| Northern Trust Corp. | 0.00% | Add +1.7% | 271,824 | $2.5M |
| Pacer Advisors, Inc. | 0.01% | Reduce -1.8% | 258,250 | $2.4M |
| Citadel Advisors | 0.00% | Add +35.2% | 229,323 | $2.1M |
| Vanguard Fiduciary Trust Co. | 0.00% | — | 227,112 | $2.1M |
| Stoic Point Capital Management LLC | 2.03% | Add +6.6% | 221,041 | $2.1M |
| Squarepoint Ops LLC | 0.00% | Add +73.4% | 215,541 | $2.0M |
| Susquehanna International Group, LLP | 0.00% | Add +134.3% | 189,736 | $1.8M |
| Teacher Retirement System of Texas | 0.01% | Add +1588.2% | 185,325 | $1.7M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +177.3% | 180,511 | $1.7M |
| Two Sigma Investments, LP | 0.00% | Add +192.8% | 175,289 | $1.6M |
| Y-Intercept (Hong Kong) Ltd | 0.03% | Reduce -24.8% | 158,170 | $1.5M |
| UBS Group AG | 0.00% | Add +157.8% | 153,883 | $1.4M |
| Caption Management, LLC | 0.07% | New | 149,048 | $1.4M |
| XTX Topco Ltd | 0.02% | Add +61.9% | 146,838 | $1.4M |
| Principal Financial Group Inc. | 0.00% | Add +288.7% | 137,613 | $1.3M |
| Man Group plc | 0.00% | Add +23.3% | 136,707 | $1.3M |
| Gsa Capital Partners LLP | 0.06% | Add +133.6% | 109,268 | $1.0M |
| Balyasny Asset Management L.P. | 0.00% | Reduce -40.9% | 108,808 | $1.0M |
| Quantinno Capital Management LP | 0.00% | Add +150.9% | 107,274 | $998K |
| State of Wisconsin Investment Board | 0.00% | Add +126.6% | 106,160 | $987K |
| PDT Partners, LLC | 0.05% | Reduce -45.6% | 90,022 | $837K |
| Victory Capital Management Inc. | 0.00% | Reduce -88.0% | 87,269 | $812K |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.4% | 86,955 | $809K |
| Divisadero Street Capital Management, LP | 0.04% | Reduce -89.8% | 86,907 | $808K |
| Russell Investments Group, Ltd. | 0.00% | Reduce -6.5% | 84,894 | $794K |
| Algert Global LLC | 0.01% | New | 84,510 | $786K |
| Globeflex Capital L P | 0.11% | No change | 80,233 | $746K |
| Amundi | 0.00% | Add +33.3% | 78,104 | $726K |
| Allianz Asset Management GmbH | 0.00% | No change | 70,176 | $653K |
| Swiss National Bank | 0.00% | No change | 58,700 | $546K |
| Mariner, LLC | 0.00% | Reduce -16.3% | 58,489 | $544K |
| BNP Paribas Financial Markets | 0.00% | Reduce -79.4% | 56,206 | $523K |
| Blair William & Co. | 0.00% | Reduce -6.9% | 55,975 | $521K |
| Rhumbline Advisers | 0.00% | Reduce -1.3% | 47,884 | $445K |
| Millennium Management | 0.00% | Reduce -93.7% | 47,041 | $437K |
| Allspring Global Investments Holdings, LLC | 0.00% | Add +11.5% | 47,885 | $435K |
| Barclays PLC | 0.00% | Reduce -50.4% | 45,364 | $422K |
| Dynamic Technology Lab Private Ltd | 0.07% | New | 43,595 | $405K |
| State of Wyoming | 0.05% | Add +10.7% | 43,001 | $400K |
| Brooklyn Investment Group | 0.01% | Add +229.9% | 39,724 | $369K |
| Vanguard Global Advisers, LLC | 0.00% | — | 37,688 | $350K |
| Fox Run Management, L.L.C. | 0.06% | Add +41.9% | 36,955 | $349K |
| T. Rowe Price Associates Inc. | 0.00% | Add +19.6% | 37,076 | $345K |
| Sei Investments Co. | 0.00% | Reduce -56.3% | 35,738 | $332K |
| Deutsche Bank AG | 0.00% | Add +10.9% | 35,088 | $326K |
| Ieq Capital, LLC | 0.00% | Reduce -62.6% | 32,921 | $306K |
| Quantbot Technologies LP | 0.01% | New | 29,119 | $271K |
| Legal & General Group Plc | 0.00% | Reduce -18.6% | 27,533 | $256K |
| FMR LLC | 0.00% | Add +463.0% | 27,174 | $253K |
| Bridgefront Capital, LLC | 0.06% | New | 26,170 | $243K |
| Abel Hall, LLC | 0.05% | New | 25,424 | $236K |
| Cannell & Spears LLC | 0.00% | Reduce -0.6% | 25,400 | $236K |
| California State Teachers Retirement System | 0.00% | Reduce -1.0% | 25,252 | $235K |
| Los Angeles Capital Management LLC | 0.00% | Reduce -67.2% | 23,740 | $221K |
| Invesco Ltd. | 0.00% | Reduce -9.2% | 23,627 | $220K |
| Elkhorn Partners Limited Partnership | 0.14% | New | 23,000 | $214K |
| Cwm, LLC | 0.00% | Reduce -47.0% | 22,425 | $209K |
| MetLife Investment Management, LLC | 0.00% | No change | 21,402 | $199K |
| Jupiter Asset Management Ltd. | 0.00% | New | 21,172 | $197K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Reduce -20.9% | 20,916 | $196K |
| State of Tennessee, Department of Treasury | 0.00% | Add +60.6% | 20,728 | $193K |
| Creative Planning | 0.00% | Reduce -21.1% | 19,946 | $185K |
| SG Americas Securities, LLC | 0.00% | Add +23.2% | 19,473 | $181K |
| Cornerstone Investment Partners, LLC | 0.01% | Add +29.8% | 19,008 | $177K |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 0.00% | No change | 18,642 | $173K |
| Ameriprise Financial Inc. | 0.00% | New | 17,807 | $166K |
| Eventide Asset Management, LLC | 0.00% | New | 17,509 | $165K |
| VANGUARD ASSET MANAGEMENT, Ltd | 0.00% | — | 17,425 | $162K |
| Mercer Global Advisors Inc. | 0.00% | Reduce -4.8% | 16,155 | $150K |
"% of holder's portfolio" is MAX's weight in each manager's 13F, not the share of Mediaalpha Inc. Class A the manager owns.