TMO

THERMO FISHER SCIENTIFIC INC

22 superinvestors own TMO

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Lindsell Train	Lindsell Train	10.13%	689,503	$399.5M	2025Q4	Reduced
Wallace Weitz	Weitz Investment Management	4.64%	134,950	$78.2M	2025Q4	New
Stephen Mandel	Lone Pine Capital	3.09%	587,696	$323.6M	2022Q4	Reduced
John Armitage	Egerton Capital	3.03%	562,479	$293.5M	2023Q2	Added
William Von Mueffling	Cantillon Capital Management	2.74%	873,322	$506.0M	2025Q4	Added
Alex Roepers	Atlantic Investment Management	2.25%	370,000	$17.7M	2010Q3	Reduced
Chris Hohn	TCI Fund Management	2.22%	1,517,639	$882.1M	2024Q1	Reduced
Viking Global Investors	Viking Global Investors	1.22%	793,187	$459.6M	2025Q4	Added
David Katz	Matrix Asset Advisors	1.11%	21,341	$12.4M	2025Q4	Reduced
Robert Olstein	Olstein Capital Management	0.76%	6,400	$4K	2025Q4	New
Kenneth Fisher	Fisher Asset Management	0.55%	2,792,421	$1.6B	2025Q4	Added
Daniel Loeb	Third Point	0.40%	50,000	$29.0M	2025Q4	Reduced
Hillman Capital Management	Hillman Value Fund	0.23%	634	$367K	2025Q4	Reduced
AKO Capital	AKO Capital	0.14%	26,427	$11K	2025Q2	Reduced
Christopher Davis	Davis Selected Advisers	0.01%	0	$8.3M	2007Q3	Reduced
Bill & Melinda Gates Foundation	Bill & Melinda Gates Foundation Trust	0.01%	5,675	$2.9M	2023Q3	New
Mairs & Power	Mairs & Power Growth Fund	0.01%	1,241	$719K	2025Q4	Reduced
Polen Capital Management	Polen Capital Management	0.01%	2,307	$1.3M	2025Q4	Reduced
Dodge & Cox	Dodge & Cox	0.01%	25,741	$14.9M	2025Q4	Held
Ruane Cunniff	Sequoia Fund	0.00%	2,873	$408K	2015Q4	Held
Bill Nygren	Oakmark Select Fund – Harris Associates	0.00%	541	$313K	2025Q4	Held
First Eagle Investment Management	First Eagle Investment Management	0.00%	200	$38K	2017Q4	Reduced

Recent insider activity — TMO

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.

Congressional trades — TMO

STOCK Act disclosures · last 12 months

Congressional trade data coming soon.

We are sourcing STOCK Act disclosures and will display them here shortly.

Learn more

What Is SEC Form 4?

Understand the insider trade filings behind TMO 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.