13F-HR: White Mountains Discloses $195M MediaAlpha Stake

White Mountains Insurance Group Ltd. reported a significant holding of 17.86 million Class A shares in MediaAlpha Inc., valued at over $195 million, as of June 30, 2025.

Summary

• White Mountains Insurance Group Ltd. filed a Form 13F-HR for the quarter ended June 30, 2025.
• The report discloses a single holding: 17,856,614 Class A shares of MediaAlpha Inc. (CUSIP: 58450V104).
• The total value of this holding is reported as $195,529,923.
• White Mountains Insurance Group Ltd. exercises sole investment discretion and sole voting authority over all reported shares.

Sentiment

Score: 5

Explanation: The filing is a routine regulatory disclosure of an institutional investment manager's equity holdings, providing factual information without inherent positive or negative sentiment regarding the manager's performance or the held security's future.

Positives

• White Mountains Insurance Group Ltd., a notable institutional investment manager, maintains a substantial equity position in MediaAlpha Inc., potentially signaling confidence in the company's prospects.
• The reported holding represents a significant investment of over $195 million, indicating a material commitment to MediaAlpha Inc.

Negatives

• The filing is a routine disclosure of past holdings and does not provide forward-looking statements, strategic rationale, or management commentary regarding the investment thesis for MediaAlpha Inc.

Future Outlook

NA

Industry Context

NA

Stakeholder Impact

• Shareholders of White Mountains Insurance Group Ltd. gain insight into a portion of the firm's equity investment portfolio.
• Investors and analysts tracking MediaAlpha Inc. can observe significant institutional ownership, which may influence market perception.

Key Dates

Keywords

White Mountains Insurance Group, MediaAlpha Inc., 13F Filing, Institutional Holdings, Equity Investments, Investment Management, Financial Disclosure