SCHEDULE: MediaAlpha Shareholder Update: White Mountains Adjusts Stake

White Mountains Insurance Group and WM Hinson have updated their Schedule 13D filing to reflect a change in their beneficial ownership percentage of MediaAlpha, Inc. Class A Common Stock due to an increase in the total number of outstanding shares.

Summary

• This filing is an amendment (Amendment No. 7) to a Schedule 13D, jointly filed by White Mountains Insurance Group, Ltd. and WM Hinson (Bermuda) Ltd. concerning their beneficial ownership of MediaAlpha, Inc. Class A Common Stock.
• The primary purpose of this amendment is to report a change in the percentage of outstanding Class A Shares beneficially owned by the Reporting Persons, solely due to an increase in the total number of outstanding Class A Shares as disclosed by MediaAlpha in its Form 10-Q filed on October 28, 2026.
• White Mountains Insurance Group, Ltd. beneficially owns 17,856,614 Class A Shares, representing approximately 35.1% of the class. WM Hinson (Bermuda) Ltd. beneficially owns 16,956,614 Class A Shares, representing approximately 33.3% of the class.
• Robert L. Seelig holds 10,000 Class A Shares, and John G. Sinkus holds 750 Class A Shares, representing approximately 0.02% and less than 0.01% respectively.

Sentiment

Score: 3

Explanation: StockSavvy.ai views this as a neutral to slightly negative filing, primarily an administrative update to reflect changes in outstanding shares rather than a strategic or financial performance announcement.

Positives

• The filing clarifies the ownership percentages, providing transparency to the market regarding significant shareholder holdings.
• The reporting persons have updated their filings promptly following the issuer's disclosure of outstanding share changes.

Negatives

• The filing does not contain new financial performance data or strategic initiatives, indicating it's an administrative update rather than a performance-driven announcement.
• The change in percentage ownership is solely due to an increase in outstanding shares, not an active acquisition or disposition of shares by the reporting persons.

Risks

• The filing does not explicitly mention any new risks. However, the underlying reason for the percentage change (increase in outstanding shares) could imply dilution or other capital-related activities by the issuer, which could indirectly impact existing shareholders.
• Potential for future changes in beneficial ownership percentages, as this filing is an amendment and further updates may occur.

Future Outlook

The filing does not contain forward-looking statements or guidance. It is an update to reflect a change in ownership percentage based on previously disclosed information by the issuer.

Management Comments

• "The purpose of this Amendment No. 7 is to report a change in the percentage of the Class A Shares beneficially owned by the Reporting Persons solely due to the change in the number of outstanding Class A Shares as disclosed in the Issuer's Form 10-Q filed with the Commission on October 28, 2026."
• "The filing of this Amendment No. 7 shall not be construed as an admission that any Reporting Person is the beneficial owner of any of the Class A Shares that such Reporting Person may be deemed to beneficially own."
• "Each of the Reporting Persons disclaims membership in a group with each other Stockholders' Agreement Party."

Industry Context

StockSavvy.ai notes that Schedule 13D filings are crucial for tracking significant ownership changes in public companies. This particular amendment is administrative, reflecting changes in the total share count rather than active trading by the reporting entities, which is common for large institutional holders adjusting to issuer-driven share adjustments.

Legal Proceedings

• During the last five years, neither Reporting Person nor, to the knowledge of the Reporting Persons after reasonable inquiry, any of the individuals listed in Annex A hereto has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).
• During the last five years, neither Reporting Person nor, to the knowledge of the Reporting Persons after reasonable inquiry, any of the individuals listed in Annex A hereto was a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

Stakeholder Impact

• Shareholders: The change in percentage ownership is administrative and does not reflect new share purchases or sales by the reporting persons. However, the underlying increase in outstanding shares by the issuer could lead to dilution, impacting existing shareholders' proportional ownership.
• Management: The filing provides transparency on significant ownership, which is a key aspect of corporate governance and stakeholder relations.

Next Steps

• Continued monitoring of MediaAlpha, Inc. for further filings from White Mountains Insurance Group, Ltd. and WM Hinson (Bermuda) Ltd.
• Review of MediaAlpha, Inc.'s financial reports for context on the increase in outstanding shares.

Key Dates

Keywords

Schedule 13D, Beneficial Ownership, MediaAlpha, White Mountains Insurance Group, WM Hinson, Class A Common Stock, Shareholder