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[SCHEDULE 13D/A] MediaAlpha, Inc. Amended Major Shareholder Report

Filing Impact
(Moderate)
Filing Sentiment
(Neutral)
Form Type
SCHEDULE 13D/A

Rhea-AI Filing Summary

White Mountains Insurance Group and its subsidiary WM Hinson (Bermuda) Ltd. report beneficial ownership of 17,856,614 MediaAlpha Class A shares, equal to 33.03% of the outstanding Class A stock. The change in percentage results from an updated MediaAlpha share count disclosed in a recent quarterly report, not from new share purchases or sales.

The filing also notes that White Mountains’s two designees on MediaAlpha’s board, Jennifer Moyer and Christopher Delehanty, have respectively decided not to stand for re‑election and to resign. White Mountains currently has no present intent to designate new directors to fill these vacancies.

Positive

  • None.

Negative

  • None.

Insights

Large 33% stake maintained; two board designees exit without replacements.

White Mountains and WM Hinson continue to hold 17,856,614 MediaAlpha Class A shares, representing 33.03% of the class based on 54,062,155 shares outstanding as of April 24, 2026. The percentage change arises from MediaAlpha’s higher share count.

The amendment also records that White Mountains’s two board designees, Jennifer Moyer and Christopher Delehanty, have stepped down or will not stand for re‑election, and the reporting persons have no present intent to name successors. This reduces their formal board representation even while a sizable economic stake remains.

The filing reiterates complex beneficial ownership relationships and explicit disclaimers of group status and beneficial ownership beyond directly held shares. Future company filings may further clarify how governance dynamics evolve with a major shareholder holding influence primarily through ownership rather than board seats.






58450V104

(CUSIP Number)
Robert L. Seelig, Esq.
23 South Main Street, Suite 3B
Hanover, NH, 03755
(603) 640-2200

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)
04/29/2026

(Date of Event Which Requires Filing of This Statement)


If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D






SCHEDULE 13D






SCHEDULE 13D


White Mountains Insurance Group, Ltd.
Signature:/s/ Robert L. Seelig
Name/Title:Robert L. Seelig - Executive Vice President and General Counsel
Date:05/01/2026
WM HINSON (BERMUDA) LTD.
Signature:/s/ John G. Sinkus
Name/Title:John G. Sinkus - Vice President
Date:05/01/2026