Millennium Management Reduces Stake in Affiliated Managers Group

Asset manager sells over 550,000 shares of AMG in Q3

Mar. 17, 2026 at 11:08am

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Millennium Management LLC, an institutional investor, decreased its holdings in shares of Affiliated Managers Group, Inc. (NYSE:AMG) by 35.2% during the third quarter, according to a recent SEC filing. The firm sold 552,213 shares, reducing its stake in the asset manager to 1,017,113 shares, or about 3.62% of the company's stock.

Why it matters

This transaction highlights the shifting investment landscape as large institutional investors adjust their portfolios. Affiliated Managers Group is a prominent asset management firm, and changes to major shareholders can impact the company's operations and market position.

The details

Millennium Management, a hedge fund with over $50 billion in assets under management, sold a significant portion of its AMG holdings in Q3 2025. The firm now owns just 3.62% of the asset manager's outstanding shares, down from 5.62% previously. No specific reasons were given for the reduction in stake.

  • Millennium Management filed the SEC disclosure on March 17, 2026.
  • The stake reduction occurred during the third quarter of 2025.

The players

Millennium Management LLC

A global hedge fund with over $50 billion in assets under management.

Affiliated Managers Group, Inc.

A global asset management holding company that partners with boutique investment firms.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident

“Fifty years is such an accomplishment in San Francisco, especially with the way the city has changed over the years.”

— Gordon Edgar, grocery employee

The takeaway

This transaction reflects the ongoing shifts in the asset management industry as large institutional investors reevaluate their portfolios and holdings. The reduction in Millennium Management's stake in Affiliated Managers Group could signal broader trends in the sector worth monitoring.