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Who owns MediaAlpha (MAX) stock

147 funds reported MediaAlpha (MAX) shares in their latest 13F filings, worth $606M in all. The largest holder is White Mountains Insurance Group ($224M). Last quarter 62 funds added to their stakes and 81 cut them.

Largest holders of MAX (13F)Largest holders of MAX (13F)White Mountains Insurance Group$224MBlackRock$42.6MClearline Capital LP$34.1MVanguard Group$33.3MVanguard Capital Management LLC$16.0MGeode Capital Management, LLC$13.4MDivisadero Street Capital Managem…$12.8MJacobs Levy Equity Management$12.2MAcadian Asset Management LLC$12.0MJacobs Asset Management, LLC$11.6M

Largest holders (13F)

FundSharesValueChangeQuarter
White Mountains Insurance Group17,856,614$224Munchanged2026-06-30
BlackRock3,392,357$42.6Mdecrease2026-06-30
Clearline Capital LP2,713,890$34.1Mincrease2026-06-30
Vanguard Group2,570,992$33.3Mdecrease2025-12-31
Vanguard Capital Management LLC1,276,369$16.0Mdecrease2026-06-30
Geode Capital Management, LLC1,068,308$13.4Mdecrease2026-06-30
Divisadero Street Capital Management, LP1,019,988$12.8Mincrease2026-06-30
Jacobs Levy Equity Management971,232$12.2Mincrease2026-06-30
Acadian Asset Management LLC957,095$12.0Mincrease2026-06-30
Jacobs Asset Management, LLC919,761$11.6Mdecrease2026-06-30
State Street862,235$10.8Mincrease2026-06-30
Arrowstreet Capital, Limited Partnership829,958$10.4Mdecrease2026-06-30
Morgan Stanley821,170$10.3Mincrease2026-06-30
Nuveen, LLC752,447$9.5Mincrease2026-06-30
Dimensional Fund Advisors LP701,914$8.8Mincrease2026-06-30

MediaAlpha's latest quarter

MediaAlpha, Q3 2026: revenue $376M (+23% year over year), operating margin 7.7%, net earnings $25.8M, operating cash flow $21.6M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most MAX stock?

By the latest 13F filings: White Mountains Insurance Group ($224M); BlackRock ($42.6M); Clearline Capital LP ($34.1M); Vanguard Group ($33.3M); Vanguard Capital Management LLC ($16.0M).

What is the short interest in MAX?

3,219,791 shares were sold short at the 2026-10-15 settlement, 13.71% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.