Who owns MediaAlpha, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of MAX from SEC Form 13F filings across 153 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 153 institutions disclosed 48.7M shares of MediaAlpha, Inc. worth $610.7M — about 90.5% of shares outstanding; the largest disclosed holder is WHITE MOUNTAINS INSURANCE GROUP LTD. Source: SEC Form 13F filings, parsed by EvidInvest.
153
13F holders
$610.7M
value, 2026 filers
90.5%
of shares outstanding (48.7M sh)
21
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of MAX's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | WHITE MOUNTAINS INSURANCE GROUP LTD | 17.9M | $224.5M | 57.0% | 33.2% | 0.0% |
| 2 | BlackRock, Inc. | 3.4M | $42.6M | 0.0% | 6.3% | -2.4% |
| 3 | Clearline Capital LP | 2.7M | $34.1M | 2.0% | 5% | +4.8% |
| 4 | JPMORGAN CHASE & CO | 1.9M | $23.3M | 0.0% | 3.5% | +7.7% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 1.3M | $16.0M | 0.0% | 2.4% | -7.9% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $13.4M | 0.0% | 2% | -0.2% |
| 7 | Divisadero Street Capital Management, LP | 1.0M | $12.8M | 0.3% | 1.9% | +1073.7% |
| 8 | JACOBS LEVY EQUITY MANAGEMENT, INC | 971,232 | $12.2M | 0.0% | 1.8% | +29.5% |
| 9 | ACADIAN ASSET MANAGEMENT LLC | 957,095 | $12.0M | 0.0% | 1.8% | +13.0% |
| 10 | JACOBS ASSET MANAGEMENT, LLC | 919,761 | $11.6M | 7.3% | 1.7% | -0.5% |
| 11 | STATE STREET CORP | 862,235 | $10.8M | 0.0% | 1.6% | +2.9% |
| 12 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 829,958 | $10.4M | 0.0% | 1.5% | -21.8% |
| 13 | MORGAN STANLEY | 821,170 | $10.3M | 0.0% | 1.5% | +16.8% |
| 14 | Nuveen, LLC | 752,447 | $9.5M | 0.0% | 1.4% | +7.3% |
| 15 | DIMENSIONAL FUND ADVISORS LP | 701,914 | $8.8M | 0.0% | 1.3% | +13.1% |
| 16 | J. Goldman & Co LP | 598,070 | $7.5M | 0.2% | 1.1% | -49.4% |
| 17 | CITADEL ADVISORS LLC | 589,696 | $7.4M | 0.0% | 1.1% | +157.1% |
| 18 | RENAISSANCE TECHNOLOGIES LLC | 574,407 | $7.2M | 0.0% | 1.1% | -20.1% |
| 19 | Shay Capital LLC | 570,000 | $7.2M | 0.5% | 1.1% | -26.5% |
| 20 | JANE STREET GROUP, LLC | 551,625 | $6.9M | 0.0% | 1% | +94.9% |
| 21 | D. E. Shaw & Co., Inc. | 535,926 | $6.7M | 0.0% | 1% | +56.7% |
| 22 | SPEECE THORSON CAPITAL GROUP INC | 489,098 | $6.1M | 1.3% | 0.9% | -2.0% |
| 23 | EVR Research LPNEW | 440,000 | $5.5M | 2.7% | 0.8% | new |
| 24 | VANGUARD PORTFOLIO MANAGEMENT LLC | 433,046 | $5.4M | 0.0% | 0.8% | -20.8% |
| 25 | GOLDMAN SACHS GROUP INC | 428,866 | $5.4M | 0.0% | 0.8% | -31.2% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.