REGN

REGENERON PHARMACEUTICALS

12 superinvestors own REGN

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Michael Burry	Scion Asset Management	19.52%	215,000	$112.9M	2025Q2	New
Mason Hawkins	Longleaf Partners – Southeastern Asset Management	4.97%	130,662	$101.0M	2026Q1	Reduced
Harry Burn	Sound Shore	3.91%	150,960	$116.6M	2026Q1	Reduced
Dodge & Cox	Dodge & Cox	1.89%	4,458,238	$3.4B	2026Q1	Reduced
Carl Icahn	Icahn Capital Management	1.27%	2,508,001	$44.6M	2007Q3	New
Viking Global Investors	Viking Global Investors	0.20%	97,739	$62.0M	2025Q1	Added
Meridian / ArrowMark	Meridian Contrarian Fund	0.02%	3,048	$861K	2014Q2	Held
Kenneth Fisher	Fisher Asset Management	0.00%	5,059	$3.9M	2026Q1	Added
Christopher Davis	Davis Selected Advisers	0.00%	0	$406K	2001Q1	Held
Richard Pzena	Pzena Investment Management	0.00%	794	$547K	2022Q3	Reduced
Bill Nygren	Oakmark Select Fund – Harris Associates	0.00%	878	$631K	2023Q2	Reduced
Polen Capital Management	Polen Capital Management	0.00%	1,383	$966K	2022Q1	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 REGN 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.