Affiliated Managers Group, Inc. (AMG) Institutional Ownership

Ownership Summary

Affiliated Managers Group, Inc. (NYSE:AMG) is held by 501 institutional investors per 13F filings through December 2025.

• Their combined ownership stood at 80.5% of outstanding shares in December 2025, down from 82.0% in September 2025.
• They increased total shares held in AMG by 0.49% quarter over quarter, and investors in Affiliated Managers increased 24.63% from a year ago.
• Of these 501 holders, 239 added to their stakes in Affiliated Managers, 170 trimmed positions, and 92 made no changes.
• Institutional investors collectively held 26.57Mn shares in Affiliated Managers as of December 2025, up by 128.31K shares quarter on quarter, and down 4.8Mn shares year over year.
• As of December 31, 2025, BlackRock, Inc. held the largest stake in Affiliated Managers with 2.87Mn shares, accounting for 8.69% of total shares outstanding.
• Leading buyers of Affiliated Managers shares for the quarter ending December 2025 were VANGUARD PORTFOLIO MANAGEMENT LLC (1.36Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.17Mn), Invesco Ltd. (219.77K), JANE STREET GROUP, LLC (212.43K), PRICE T ROWE ASSOCIATES INC /MD/ (183.62K).
• Leading sellers of Affiliated Managers shares for the quarter ending December 2025 were MILLENNIUM MANAGEMENT LLC (790.64K), FULLER & THALER ASSET MANAGEMENT, INC. (610.96K), Clarkston Capital Partners, LLC (590.41K), NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO (193.38K), UBS Group AG (166.3K).
• According to Business Quant data, leading holders of AMG for December 2025 are BlackRock, Inc. (2.87Mn), Morgan Stanley (1.73Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (1.36Mn), VANGUARD CAPITAL MANAGEMENT LLC (1.17Mn), ARIEL INVESTMENTS, LLC (1.06Mn), Boston Partners (971.25K), State Street Corp (926.73K), FULLER & THALER ASSET MANAGEMENT, INC. (760.21K), DIMENSIONAL FUND ADVISORS LP (718.31K), GEODE CAPITAL MANAGEMENT, LLC (635.78K).