BSX

BOSTON SCIENTIFIC CORP

15 superinvestors own BSX

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
David Einhorn	Greenlight Capital	9.79%	32,668,000	$294.0M	2009Q4	New
John Armitage	Egerton Capital	5.58%	5,385,084	$513.5M	2025Q4	Added
David Tepper	Appaloosa Management	5.44%	7,797,503	$41.6M	2011Q4	New
Lee Ainslie	Maverick Capital	3.01%	2,944,254	$280.7M	2025Q4	New
David Katz	Matrix Asset Advisors	2.37%	2,395,407	$36.7M	2007Q2	Added
Polen Capital Management	Polen Capital Management	1.64%	4,019,552	$383.3M	2025Q4	Reduced
Bill Miller	Miller Value Partners	1.57%	3,008,850	$17.1M	2012Q2	Reduced
Viking Global Investors	Viking Global Investors	0.64%	2,509,808	$239.3M	2025Q4	Reduced
Kenneth Fisher	Fisher Asset Management	0.30%	9,138,216	$871.3M	2025Q4	Added
William Von Mueffling	Cantillon Capital Management	0.14%	191,180	$4.7M	2005Q4	Added
Stephen Mandel	Lone Pine Capital	0.14%	201,703	$19.2M	2025Q4	New
Mairs & Power	Mairs & Power Growth Fund	0.01%	10,176	$970K	2025Q4	Reduced
Meridian / ArrowMark	Meridian Contrarian Fund	0.01%	23,000	$311K	2014Q1	Reduced
Bill Nygren	Oakmark Select Fund – Harris Associates	0.00%	255,935	$1.5M	2012Q4	Reduced
Dodge & Cox	Dodge & Cox	0.00%	88,885	$8.5M	2025Q4	Held

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 BSX 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.