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Affiliated Managers Group, Inc.

AMG
Exchange
NYSE
Industry
Investment Advice
SEC CIK
0001004434

No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 567 institutions reported holding it in 13F filings for Q2 2026, worth $8.53B in total; Southeastern Asset Management (Longleaf) is the only superinvestor holding it.

Other share classesMGRMGRBMGRDMGRE

Superinvestors holding AMG, Q2 2026

1 superinvestor reports holding Affiliated Managers Group, Inc. on Form 13F, worth $1.88M in total. Weight is Affiliated Managers Group, Inc.'s share of each 13F portfolio; actions compare shares with Q1 2026.

See all superinvestors
Superinvestors holding AMG in Q2 2026
Superinvestor% of portfolioSharesValuevs. previous quarter
Southeastern Asset Management (Longleaf)Mason Hawkins0.1%5,562$1.88MUnchanged

Moves by quarter

Superinvestors that opened, added to, trimmed or sold out of AMG each quarter, comparing shares with the quarter before. A superinvestor that didn't file for a quarter isn't listed, and isn't counted as selling.

  1. Q4 2025

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−18.7%)

  2. Q2 2025

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−98.6%)

  3. Q1 2025

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−31.7%)

  4. Q4 2024

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−3.1%)

  5. Q3 2024

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−8.9%)

  6. Q2 2024

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−5.1%)
    Sold out
    Maverick Capital

  7. Q1 2024

    2 superinvestors holding at quarter end

    New
    Maverick Capital
    Reduced
    Southeastern Asset Management (Longleaf) (−5.0%)

  8. Q4 2023

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−2.8%)

  9. Q3 2023

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−1.4%)
    Sold out
    Maverick Capital

  10. Q2 2023

    2 superinvestors holding at quarter end

    Added
    Maverick Capital (+134.4%)
    Reduced
    Southeastern Asset Management (Longleaf) (−0.3%)

  11. Q1 2023

    2 superinvestors holding at quarter end

    New
    Maverick Capital
    Reduced
    Southeastern Asset Management (Longleaf) (−0.9%)

  12. Q4 2022

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−42.4%)

  13. Q3 2022

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−7.7%)

  14. Q2 2022

    1 superinvestor holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−1.3%)

  15. Q1 2022

    1 superinvestor holding at quarter end

    Added
    Southeastern Asset Management (Longleaf) (+15.5%)
    Sold out
    HHLR Advisors (Hillhouse), Maverick Capital

  16. Q4 2021

    3 superinvestors holding at quarter end

    Reduced
    Southeastern Asset Management (Longleaf) (−3.9%), Maverick Capital (−88.9%)

  17. Q3 2021

    3 superinvestors holding at quarter end

    Added
    Southeastern Asset Management (Longleaf) (+5.9%), Maverick Capital (+7.5%)

  18. Q2 2021

    3 superinvestors holding at quarter end

    Added
    Southeastern Asset Management (Longleaf) (+18.9%), Maverick Capital (+10.2%)