White Mountains Insurance Group Ltd - Aug 8, 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
56.3M shares
Disclosed Ownership
17.9M shares
Ownership
31.7%
Form type
SCHEDULE 13D/A
Date filed
8/8/2025, 04:22 PM
Date of event
Aug 8, 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. 31.7% 17.9M 900K 17M /s/ Robert L. Seelig Robert L. Seelig - Executive Vice President and General Counsel 0000776867
WM Hinson (Bermuda) Ltd. 30.1% 17M 0 17M /s/ John G. Sinkus John G. Sinkus - Vice President 0001979065