IBKR

INTERACTIVE BROKERS GROUP IN

6 superinvestors own IBKR

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Bryan Lawrence	Oakcliff Capital	28.42%	1,030,740	$66.3M	2025Q4	Held
Robert Vinall	RV Capital GmbH	11.27%	752,478	$48.4M	2025Q4	Reduced
John Armitage	Egerton Capital	4.85%	6,939,581	$446.3M	2025Q4	Added
William Von Mueffling	Cantillon Capital Management	4.44%	12,759,904	$820.6M	2025Q4	Added
Meridian / ArrowMark	Meridian Contrarian Fund	0.01%	8,800	$566K	2025Q4	Held
Kenneth Fisher	Fisher Asset Management	0.00%	9,260	$596K	2025Q4	Added

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 IBKR 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.