WTM

White Mountains

7 superinvestors own WTM

Based on latest 13F filings — data is 45–90 days delayed

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Thomas Gayner	Markel Group	3.89%	145,300	$75.5M	2007Q3	Held
Mason Hawkins	Longleaf Partners – Southeastern Asset Management	2.04%	18,864	$41.4M	2026Q1	Reduced
Chuck Akre	Akre Capital Management	0.16%	3,959	$2.4M	2006Q1	Added
Bruce Berkowitz	Fairholme Capital	0.02%	7,374	$2.5M	2009Q4	Reduced
Third Avenue Management	Third Avenue Management	0.02%	32,428	$61.6M	2004Q3	Added
Christopher Davis	Davis Selected Advisers	0.00%	0	$514K	2008Q4	Held
Dodge & Cox	Dodge & Cox	0.00%	300	$374K	2022Q2	Reduced

Open-market purchases (P) and sales (S) from SEC Form 4 filings · last 12 months

No open-market insider trades in the last 12 months.

Form 4 filings for option exercises and other transaction types are excluded.

STOCK Act disclosures · last 12 months

Congressional trade data coming soon.

We are sourcing STOCK Act disclosures and will display them here shortly.

What Is SEC Form 4?

Understand the insider trade filings behind WTM activity.

What Is a 13F Filing?

How superinvestors disclose their quarterly holdings.

Insider Cluster Buying

Why multiple insiders buying together is a strong signal.

Superinvestor Consensus

The most widely held stocks across all tracked institutions.