Quick Takeaways
- WHITE MOUNTAINS INSURANCE GROUP LTD filed SCHEDULE 13D/A for MediaAlpha, Inc. Class A Common Stock, par value $0.01 per share (MAX).
- Disclosed ownership: 32%.
- Date of event: 08 Aug 2025.
WHITE MOUNTAINS INSURANCE GROUP LTD - 08 Aug 2025 SCHEDULE 13D/A Report for MediaAlpha, Inc. Class A Common Stock, par value $0.01 per share (MAX)
- Filing Manager
- WHITE MOUNTAINS INSURANCE GROUP LTD
- Reporting Manager
- White Mountains Insurance Group, Ltd.
- Symbol
- MAX
- Shares outstanding
- 56,330,013 shares
- Disclosed Ownership
- 17,856,614 shares
- Ownership
- 32%
- Form type
- SCHEDULE 13D/A
- Filing time
- 08 Aug 2025, 16:22:12 UTC
- Date of event
- 08 Aug 2025
- Next filing
- 01 May 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"WHITE MOUNTAINS INSURANCE GROUP LTD disclosed 32% ownership in MediaAlpha, Inc. Class A Common Stock, par value $0.01 per share (MAX) on 08 Aug 2025."
What Changed
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 08 Aug 2025, 16:22.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| White Mountains Insurance Group, Ltd. | 32% | 17,856,614 | 900,000 | 16,956,614 | /s/ Robert L. Seelig | Robert L. Seelig - Executive Vice President and General Counsel | 0000776867 |
| WM Hinson (Bermuda) Ltd. | 30% | 16,956,614 | 0 | 16,956,614 | /s/ John G. Sinkus | John G. Sinkus - Vice President | 0001979065 |