SCHEDULE 13G/A

AFFILIATED MANAGERS GROUP INC

Common Stock, par value $0.01 per share · CUSIP: 008252108

Event date: 2025-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Integrated Core Strategies (US) LLC

  Shares: 974,596.00 · Class: 3.4%

• Millennium Management LLC

  Shares: 1,017,113.00 · Class: 3.6%

• Millennium Group Management LLC

  Shares: 1,017,113.00 · Class: 3.6%

• Israel A. Englander

  Shares: 1,017,113.00 · Class: 3.6%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.