IDXX

IDEXX LABORATORIES

13 superinvestors own IDXX

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Terry Smith	Fundsmith	7.18%	4,429,104	$965.3M	2018Q2	New
Polen Capital Management	Polen Capital Management	2.70%	695,811	$391.0M	2026Q1	Reduced
Wallace Weitz	Weitz Investment Management	1.38%	35,300	$19.8M	2026Q1	Held
Henry Ellenbogen	Durable Capital Partners	1.37%	364,757	$153.2M	2025Q1	Added
Meridian / ArrowMark	Meridian Contrarian Fund	0.53%	135,113	$16.4M	2014Q1	Reduced
Christopher Davis	Davis Selected Advisers	0.08%	264,392	$19.3M	2015Q4	Reduced
Jensen Investment Management	Jensen Investment Management	0.04%	3,570	$2.0M	2026Q1	Held
Mairs & Power	Mairs & Power Growth Fund	0.01%	2,080	$1.2M	2026Q1	Reduced
Ruane Cunniff	Sequoia Fund	0.00%	2,365	$370K	2017Q4	Reduced
Dodge & Cox	Dodge & Cox	0.00%	3,600	$211K	2007Q4	New
First Eagle Investment Management	First Eagle Investment Management	0.00%	4,000	$486K	2014Q1	Held
Bill Nygren	Oakmark Select Fund – Harris Associates	0.00%	482	$271K	2026Q1	Added
Kenneth Fisher	Fisher Asset Management	0.00%	599	$337K	2026Q1	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 IDXX 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.