STX

D SEAGATE TECHNOLOGY COMMON

6 superinvestors own STX

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
William Von Mueffling	Cantillon Capital Management	2.23%	3,644,000	$72.8M	2005Q4	Added
John Armitage	Egerton Capital	2.18%	729,325	$200.8M	2025Q4	Reduced
Sarah Ketterer	Causeway Capital Management	0.89%	330,110	$36.2M	2024Q3	Reduced
Viking Global Investors	Viking Global Investors	0.81%	3,186,400	$197.1M	2023Q2	Reduced
FPA / Steven Romick	FPA Crescent Fund – First Pacific Advisors	0.14%	325,000	$6.5M	2005Q4	Added
Kenneth Fisher	Fisher Asset Management	0.00%	959	$376K	2026Q1	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 STX 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.