Activist & passive stakes

Investors crossing the 5% ownership line, from SEC Schedule 13D (activist) and 13G (passive) filings. Newest first.

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Filing

Stake type

Min % owned

Amendments only.1–2 of 2

ActivistAmendment 8
Nov 6, 2026
MAX · MediaAlpha, Inc.
White Mountains Insurance Group, Ltd.
24.3% · 12,356,223 shSEC
ActivistAmendment 7
Oct 31, 2026
MAX · MediaAlpha, Inc.
White Mountains Insurance Group, Ltd.
35.1% · 17,856,614 shSEC

Filing	Symbol	Holder	% Owned	Shares	Filed	SEC filing
ActivistAmendment 8	MAX	White Mountains Insurance Group, Ltd. in MediaAlpha, Inc.	24.3%	12,356,223	Nov 6, 2026	SEC
ActivistAmendment 7	MAX	White Mountains Insurance Group, Ltd. in MediaAlpha, Inc.	35.1%	17,856,614	Oct 31, 2026	SEC