Affiliated Managers AMG Institutional Ownership

Ownership Summary

Affiliated Managers Group, Inc. (NYSE:AMG) showed up in the 13F filings of 539 institutional investors as of March 2026.

• These investors held 93.3% of outstanding shares in March 2026, down from 94.6% in December 2025.
• They increased total shares held in AMG by 8.98% quarter over quarter, and investors in Affiliated Managers increased 34.75% from a year ago.
• Among the 539 funds, 304 bought more Affiliated Managers shares, 136 sold down, and 99 held their ground.
• Combined, these investors held 25.01Mn shares in AMG for March 2026, up by 2.06Mn shares quarter on quarter, and down 4.03Mn shares year over year.
• As of March 31, 2026, the biggest holder of Affiliated Managers is BlackRock, Inc. at 2.87Mn shares, representing 10.7% of shares outstanding.
• The largest buyers of Affiliated Managers for the quarter ending March 2026 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 March 2026 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).
• Business Quant data shows the 10 biggest positions in Affiliated Managers as of March 2026 are held by 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).