13F-HR: White Mountains Insurance Group Q1 2026 Holdings

White Mountains Insurance Group Ltd. reports its Q1 2026 holdings, primarily in MediaAlpha Inc. CL A and SPDR S&P 500 ETF Trust.

Summary

• This filing details the holdings of White Mountains Insurance Group Ltd. as of March 31, 2026.
• The total value of reported holdings is $313,368,520.
• The primary holdings are in MediaAlpha Inc. CL A and SPDR S&P 500 ETF Trust.
• White Mountains Insurance Group Ltd. has sole voting authority over all reported shares.

Sentiment

Score: 5

Explanation: StockSavvy.ai views this as a neutral filing, as it is a routine disclosure of holdings without new strategic information or performance data.

Positives

• Significant investment in MediaAlpha Inc. CL A valued at $166,066,510.
• Substantial investment in SPDR S&P 500 ETF Trust valued at $147,302,010.
• Sole voting authority over all reported holdings indicates strong control and conviction.

Risks

• Concentration risk due to significant investment in a single company (MediaAlpha Inc.).
• Market risk associated with the SPDR S&P 500 ETF Trust, which is subject to overall stock market fluctuations.

Future Outlook

This filing is a snapshot of holdings as of a specific date and does not contain forward-looking statements or guidance.

Industry Context

StockSavvy.ai notes that this Form 13F filing from White Mountains Insurance Group Ltd. reflects typical portfolio management strategies for institutional investors, balancing concentrated positions in specific companies like MediaAlpha Inc. with diversified exposure through ETFs like the SPDR S&P 500.

Stakeholder Impact

• Shareholders: The filing provides transparency into the company's investment strategy and portfolio composition, which can influence investor confidence.
• Regulators: Compliance with SEC reporting requirements is maintained.

Key Dates

Keywords

Form 13F, White Mountains Insurance Group, MediaAlpha Inc., SPDR S&P 500 ETF Trust, Institutional Holdings, Investment Portfolio, SEC Filing, Equity Holdings