MediaAlpha, Inc. has 6 Schedule 13D or 13G filings on record since 2025-08-08. 3 holders' latest filing reports 5% or more of class a common stock, par value $0.01 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| White Mountains Insurance Group, Ltd. | 33.03% | 17,856,614 | SCHEDULE 13D/A, 2026-05-01 | 2026-04-29 |
| Eugene Nonko | 9.8% | 5,198,121 | SCHEDULE 13D/A, 2026-08-26 | 2026-08-25 |
| Divisadero Street Capital Management, LP | 5.8% | 3,128,988 | SCHEDULE 13G, 2026-07-28 | 2026-07-21 |
| The Vanguard Group | 4.61% | 2,600,621 | SCHEDULE 13G/A, 2025-10-31 | 2025-09-30 |
| Insignia Capital Partners GP, L.L.C. | 0% | 0 | SCHEDULE 13G/A, 2025-11-12 | 2025-09-30 |
Purpose of Transaction (Item 4)
White Mountains Insurance Group, Ltd.
Item 4 is amended and supplemented as follows: On March 31, 2025, Jennifer Moyer, one of White Mountains's two designees on the Issuer's board of directors (the "Board") and the Chair of the Issuer's Nominating and Corporate Governance Committee, informed the Issuer of her decision to not stand for re-election to the Board (the "Moyer Notification"). On December 4, 2025, Christopher Delehanty, White Mountains's second designee on the Board, informed the Issuer of his decision to resign as a member of the Board (the "Delehanty Notification", and, together with the Moyer Notification, the "Notifications"). The Reporting Persons have no present intent to designate directors to fill the vacancies left by the Notifications.Item 4 of the SCHEDULE 13D/A filed 2026-05-01
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-08-08 | White Mountains Insurance Group, Ltd. | 31.7% | SCHEDULE 13D/A |
| 2025-10-31 | The Vanguard Group | 4.61% | SCHEDULE 13G/A |
| 2025-11-12 | Insignia Capital Partners GP, L.L.C. | 0% | SCHEDULE 13G/A |
| 2026-05-01 | White Mountains Insurance Group, Ltd. | 33.03% | SCHEDULE 13D/A |
| 2026-07-28 | Divisadero Street Capital Management, LP | 5.8% | SCHEDULE 13G |
| 2026-08-26 | Eugene Nonko | 9.8% | SCHEDULE 13D/A |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.