As of November 6, 2026, MediaAlpha, Inc. is a publicly traded company (NYSE: MAX). The largest holder reporting an active stake on Schedule 13D is White Mountains Insurance Group, Ltd., at 24.3%. No bankruptcy or receivership appears in its SEC Form 8-K filings. Founder or officer holdings: Eugene Nonko, a director (9.8%). Passive holders reporting on Schedule 13G include Divisadero Street Capital Management, LP (5.8%) (Schedule 13D/A, November 5, 2026).
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Is MediaAlpha, Inc. a real, registered company?
- MediaAlpha, Inc. files with the SEC under CIK 1818383 (its SEC filings).
- Its shares are listed under the ticker MAX on NYSE (SEC company record).
- Incorporated in Delaware; business address in Los Angeles, California, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MediaAlpha, Inc. in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is Patrick Thompson, Chief Financial Officer (Form 8-K filed 2026-09-03). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names White Mountains Insurance Group, Ltd. (filed 2026-11-05).
Who are MediaAlpha, Inc.'s owners and officers?
MediaAlpha, Inc.: incorporated in Delaware; business address in Los Angeles, California; industry Services-Business Services, NEC (Schedule 13D/A, 2026-11-05).
| Report | Holder | Share |
|---|---|---|
| Schedule 13D/A, 2026-11-05 | White Mountains Insurance Group, LTD. | 24.3% |
| Schedule 13D/A, 2026-10-30 | White Mountains Insurance Group, LTD. | 35.1% |
| Schedule 13D/A, 2026-08-26 | Eugene Nonko | 9.8% |
| Schedule 13G, 2026-07-28 | Divisadero Street Capital Management, LP | 5.8% |
| Schedule 13D/A, 2026-05-01 | White Mountains Insurance Group, LTD. | 33.03% |
| Schedule 13G/A, 2025-11-12 | Insignia Capital Partners Gp, L.L.C. | 0% |
| Schedule 13G/A, 2025-10-31 | The Vanguard Group | 4.61% |
| Schedule 13D/A, 2025-08-08 | White Mountains Insurance Group, LTD. | 31.7% |
Questions about who owns MediaAlpha, Inc.
Who owns MediaAlpha, Inc.?
On this page, 3 holders' latest ownership filings report 5% or more of MediaAlpha, Inc.: White Mountains Insurance Group, LTD. (24.3%, Schedule 13D/A, filed 2026-11-05), Eugene Nonko (9.8%, Schedule 13D/A, filed 2026-08-26) and Divisadero Street Capital Management, LP (5.8%, Schedule 13G, filed 2026-07-28).
Who are the largest shareholders of MediaAlpha, Inc.?
By the share each holder's latest filing reports, the largest holders of MediaAlpha, Inc. on this page are White Mountains Insurance Group, LTD. (24.3%), Eugene Nonko (9.8%) and Divisadero Street Capital Management, LP (5.8%).
When did White Mountains Insurance Group, LTD. buy into MediaAlpha, Inc.?
The filings give report dates, not purchase dates. The earliest filing from White Mountains Insurance Group, LTD. on this page is the Schedule 13D/A, filed 2025-08-08, reporting 31.7%; its latest, Schedule 13D/A filed 2026-11-05, reports 24.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-03 | Patrick Thompson | Chief Financial Officer | departed |
Which insiders own MediaAlpha, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- White Mountains Insurance Group Ltd., a 10% owner: 12,356,223 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-11-05).
- WM Hinson (Bermuda) Ltd., a 10% owner: 12,356,223 shares, held indirectly (the form names the holder only in its footnotes), on a joint filing (Form 4, 2026-11-05).
- , a director: 1,893,707 shares (Form 4, 2026-11-04).
- , a director: 1,112,864 shares, 654,436 held directly and 458,428 indirectly (Form 4, 2026-11-04).
- Patrick Thompson: 1,080,127 shares (Form 4, 2026-08-17).
Shares only: the company's cover page does not give one share count for a single class, so no percentage is worked out.
How much has MediaAlpha, Inc. raised?
No fundraising or offering filing from MediaAlpha, Inc. is on file with us.
Keep reading
More on MediaAlpha, Inc. and the records around it.
MediaAlpha, Inc. elsewhere on the record
- 5%+ stake filings Nov 2026
- Leadership changes Sep 2026
Companies that share a holder
- Divisadero Street Capital Management, LP also filed stake reports on 22 other companies: Rush Street Interactive, Inc. (Sep 2026), Build-a-Bear Workshop, Inc (Aug 2026), Citi Trends, Inc. (Aug 2026)
- The Vanguard Group also filed stake reports on 2384 other companies: BellRing Brands, Inc. (Sep 2026), CAL-MAINE FOODS INC (Sep 2026), FTAI Aviation Ltd. (Sep 2026)
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