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.
Security
MediaAlpha, Inc. Class A Common Stock, par value $0.01 per share
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
SEC
View on sec.gov

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