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AMG · Affiliated Managers Group, Inc. · Holdings

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$376.35 +4.92 (+1.32%)
Market Cap
$9.52B
Shares
25.86M
Volume · Oct 5 37.27K Avg daily vol (3M) 272.16K

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.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 573
Total Value: $8,592,802,593
Total Shares: 25,561,554
Showing 1–100 of 588 holdings by value · page 1 of 6

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 572 13F filers
Top Holder
10.9%
Sep 2023 → Jun 2026 · range 10.5% – 11.9%
of institutional value
Top 5
30.7%
Sep 2023 → Jun 2026 · range 30.7% – 43.0%
of institutional value
Top 10
47.6%
Sep 2023 → Jun 2026 · range 47.6% – 61.1%
of institutional value
HHI
323
Sep 2023 → Jun 2026 · range 323 – 497
Broadly held
Showing 100 of 588
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1004434 CUSIP 008252108 13F (30d) 20 filings 12 filers Visit website Investor relations