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AMG · Affiliated Managers Group, Inc.

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$355.47 -8.10 (-2.23%)
Market Cap
$9.40B
Shares
25.86M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 564
Total Value: $8,584,022,936
Total Shares: 25,443,470

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 564 13F filers · Δ vs Mar 31, 2026
Top Holder
10.9%
Sep 2023 → Jun 2026 · range 10.5% – 11.9%
−0.6 pts
Top 5
30.8%
Sep 2023 → Jun 2026 · range 30.8% – 43.0%
−2.1 pts
Top 10
47.7%
Sep 2023 → Jun 2026 · range 47.7% – 61.1%
−1.3 pts
HHI
324
Sep 2023 → Jun 2026 · range 324 – 497
Broadly held−20

Quarterly Activity

vs Mar 31, 2026
New
79
Increased
160
Decreased
216
Sold Out
66
Unchanged
109
Holder count: +13
Institutional value: +24.5%
Shares held: +1.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 578
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1004434 CUSIP 008252108 13F (30d) 525 filings 500 filers Visit website Investor relations