MBI

M B I A Inc

13 superinvestors own MBI

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Kahn Brothers Group	Kahn Brothers Group	2.15%	2,056,434	$12.2M	2026Q1	Added
Thomas Gayner	Markel Group	2.00%	635,765	$38.8M	2007Q3	Reduced
Third Avenue Management	Third Avenue Management	0.84%	125,624	$2.2B	2004Q3	Added
William Von Mueffling	Cantillon Capital Management	0.75%	689,041	$42.1M	2007Q3	Held
David Katz	Matrix Asset Advisors	0.30%	21,010	$1.6M	2000Q4	Added
Tweedy Browne Co.	Tweedy Browne Value Fund	0.18%	75,273	$4.6M	2007Q3	Reduced
Bill Ackman	Pershing Square Capital Management	0.16%	873,000	$3.8M	2008Q2	Added
Bill Miller	Miller Value Partners	0.02%	67,600	$723K	2018Q3	Held
David Einhorn	Greenlight Capital	0.01%	12,880	$157K	2008Q1	New
Bill Nygren	Oakmark Select Fund – Harris Associates	0.01%	9,300	$568K	2007Q3	Reduced
Dodge & Cox	Dodge & Cox	0.00%	18,825	$1.1M	2007Q3	Reduced
Christopher Davis	Davis Selected Advisers	0.00%	0	$1.4M	2009Q3	Reduced
Ruane Cunniff	Sequoia Fund	0.00%	5,100	$302K	2003Q4	New

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 MBI 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.