AMG

AFFILIATED MANAGERS GROUP

$302.80-3.22 (-1.05%)

Closing price as of May 8, 2026

8 superinvestors own AMG

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

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Ariel Investments	Ariel Investments (Bobrinskoy & Rogers)	3.30%	1,064,030	$294.4M	2026Q1	Reduced
Meridian / ArrowMark	Meridian Contrarian Fund	0.73%	107,864	$23.4M	2013Q4	Reduced
Viking Global Investors	Viking Global Investors	0.22%	67,000	$8.5M	2007Q3	Added
Mason Hawkins	Longleaf Partners – Southeastern Asset Management	0.08%	5,562	$1.5M	2026Q1	Held
Ruane Cunniff	Sequoia Fund	0.03%	16,645	$2.7M	2017Q1	Held
Kenneth Fisher	Fisher Asset Management	0.02%	253,263	$70.1M	2026Q1	Added
Jensen Investment Management	Jensen Investment Management	0.01%	6,860	$572K	2019Q3	Held
Dodge & Cox	Dodge & Cox	0.00%	2,400	$572K	2025Q3	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 AMG 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.