White Mountains Insurance Group’s MediaAlpha MAX Stock Holding History

White Mountains Insurance Group’s Portfolio MAX Stock Details MAX Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$166M	Hold	17,856,614	–	–	52.99%	1
2025 Q4	$231M	Hold	17,856,614	–	–	88.28%	1
2025 Q3	$203M	Hold	17,856,614	–	–	100%	1
2025 Q2	$196M	Hold	17,856,614	–	–	100%	1
2025 Q1	$165M	Hold	17,856,614	–	–	57.7%	1
2024 Q4	$202M	Hold	17,856,614	–	–	47.31%	2
2024 Q3	$323M	Hold	17,856,614	–	–	59.53%	1
2024 Q2	$235M	Sell	17,856,614 -5,000,200	-22%	-$92M	53%	1
2024 Q1	$466M	Hold	22,856,814	–	–	75.44%	1
2023 Q4	$255M	Hold	22,856,814	–	–	64.91%	1
2023 Q3	$189M	Hold	22,856,814	–	–	42.82%	2
2023 Q2	$236M	Buy	22,856,814 +5,916,816	+35%	+$53.5M	46.37%	2
2023 Q1	$254M	Hold	16,939,998	–	–	41.52%	2
2022 Q4	$169M	Hold	16,939,998	–	–	33.55%	2
2022 Q3	$148M	Hold	16,939,998	–	–	76.15%	1
2022 Q2	$167M	Hold	16,939,998	–	–	100%	1
2022 Q1	$280M	Hold	16,939,998	–	–	100%	1
2021 Q4	$262M	Hold	16,939,998	–	–	100%	1
2021 Q3	$316M	Hold	16,939,998	–	–	100%	1
2021 Q2	$713M	Hold	16,939,998	–	–	100%	1
2021 Q1	$600M	Sell	16,939,998 -3,592,204	-17%	-$178M	100%	1
2020 Q4	$802M	Buy	+20,532,202	New	+$796M	100%	1

Other funds holding MAX

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Clearline Capital New York $1.93B AUM 38.13% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

JGC

J. Goldman & Co New York $3.44B AUM 33.8% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Arrowstreet Capital Boston, Massachusetts $185B AUM 39.58% 1-Year Est. Return

JAM

Jacobs Asset Management New York $167M AUM 22.68% 1-Year Est. Return

Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

White Mountains Insurance Group's MAX Position: Q1 2026 in Review

White Mountains Insurance Group held its MediaAlpha (MAX) position steady in Q1 2026 at 17,856,614 shares worth $166M. The position accounts for 52.99% of the portfolio, ranked #1.

White Mountains Insurance Group first reported a position in MAX in Q4 2020 and has held it in 22 quarters since. The position peaked at $802M in Q4 2020. 162 funds tracked by Wall St. Rank hold MAX as of Q1 2026.

White Mountains Insurance Group held 17,856,614 shares of MediaAlpha worth $166M as of Q1 2026.
White Mountains Insurance Group left its MediaAlpha share count unchanged in Q1 2026.
MediaAlpha made up 52.99% of White Mountains Insurance Group's portfolio in Q1 2026, its #1 holding.
White Mountains Insurance Group first reported a position in MediaAlpha in Q4 2020 and has held it in 22 quarters since.
White Mountains Insurance Group's MediaAlpha position peaked at $802M in Q4 2020.
162 funds tracked by Wall St. Rank held MediaAlpha as of Q1 2026.

Based on White Mountains Insurance Group's 13F filing for Q1 2026, filed 12 May 2026.