MRK

Merck & Co. Inc.

$120.29

Closing price as of Mar 31, 2026

10 superinvestors own MRK

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Kahn Brothers Group	Kahn Brothers Group	8.02%	430,103	$45.3M	2025Q4	Reduced
Bill Nygren	Oakmark Select Fund – Harris Associates	1.87%	14,088,705	$1.5B	2025Q4	Added
David Tepper	Appaloosa Management	1.76%	2,113,620	$74.6M	2011Q2	Reduced
Sarah Ketterer	Causeway Capital Management	1.51%	1,044,617	$110.0M	2025Q4	Reduced
Kenneth Fisher	Fisher Asset Management	0.89%	24,873,327	$2.6B	2025Q4	Added
Prem Watsa	Fairfax Financial Holdings	0.87%	172,900	$18.2M	2025Q4	New
Mairs & Power	Mairs & Power Growth Fund	0.05%	51,999	$5.5M	2025Q4	Held
David Katz	Matrix Asset Advisors	0.03%	2,862	$301K	2025Q4	Held
Dodge & Cox	Dodge & Cox	0.01%	138,205	$14.5M	2025Q4	Reduced
Richard Pzena	Pzena Investment Management	0.00%	3,324	$350K	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 MRK 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.