CLB

CORE LABORATORIES COMMON

8 superinvestors own CLB

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
William Von Mueffling	Cantillon Capital Management	3.27%	745,323	$102.8M	2013Q1	Added
Ariel Investments	Ariel Investments (Bobrinskoy & Rogers)	2.48%	13,170,388	$221.1M	2026Q1	Reduced
AKO Capital	AKO Capital	0.60%	1,365,005	$53.2M	2021Q2	Added
Meridian / ArrowMark	Meridian Contrarian Fund	0.05%	50,000	$5.8M	2018Q3	Reduced
FPA / Steven Romick	FPA Crescent Fund – First Pacific Advisors	0.04%	29,600	$1.9M	2006Q3	Reduced
Polen Capital Management	Polen Capital Management	0.01%	3,094	$524K	2013Q3	Reduced
Kenneth Fisher	Fisher Asset Management	0.00%	736,747	$12.4M	2026Q1	Reduced
Mairs & Power	Mairs & Power Growth Fund	0.00%	8,685	$275K	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 CLB 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.