AFFILIATED MANAGERS GROUP (AMG) Stock Institutional Trading Activity


AFFILIATED MANAGERS GROUP (AMG) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Ariel Appreciation Fund, Renaissance Technologies LLC, Longleaf Partners, Sequoia Financial Advisors, and Dodge & Cox Stock Fund. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

Explore more:

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Longleaf PartnersSell-1,2765,562$1,603,413
Q4 2025Renaissance Technologies LLCSell-48,20019,100$5,506,148
Q4 2025Ariel Appreciation FundSell-81,6011,182,223$340,811,246
Q3 2025Sequoia Financial AdvisorsBuy8202,459$586,319
Q3 2025Renaissance Technologies LLCBuy22,90067,300$16,046,339
Q3 2025Ariel Appreciation FundSell-91,2511,263,824$301,333,556
Q3 2025Dodge & Cox Stock FundSell-6002,400$572,232
Q2 2025Sequoia Financial AdvisorsSell-2,2561,639$322,522
Q2 2025Longleaf PartnersSell-472,9336,838$1,345,514
Q2 2025Renaissance Technologies LLCSell-2,60044,400$8,736,588
Q2 2025Ariel Appreciation FundSell-52,0761,355,075$266,638,107
Q1 2025Renaissance Technologies LLCBuy1,60047,000$7,897,410
Q1 2025Longleaf PartnersSell-222,716479,771$80,615,921
Q1 2025Ariel Appreciation FundSell-16,7761,407,151$236,443,583
Q1 2025Dodge & Cox Stock FundSell-3,5003,000$504,090
Q4 2024Renaissance Technologies LLCSell-54,40045,400$8,395,368
Q4 2024Longleaf PartnersSell-22,342702,487$129,903,896
Q4 2024Ariel Appreciation FundSell-28,2341,423,927$263,312,581
Q4 2024Dodge & Cox Stock FundBuy6,5006,500$1,201,980
Q3 2024Renaissance Technologies LLCBuy9,60099,800$17,744,440
Q3 2024Longleaf PartnersSell-70,420724,829$128,874,600
Q3 2024Ariel Appreciation FundBuy9,3441,452,161$258,194,226
Q2 2024Renaissance Technologies LLCBuy33,50090,200$14,091,946
Q2 2024Ariel Appreciation FundBuy115,8081,442,817$225,411,300
Q2 2024Longleaf PartnersSell-42,629795,249$124,241,751
Q1 2024Renaissance Technologies LLCSell-48,30056,700$9,496
Q1 2024Ariel Appreciation FundBuy84,3131,327,009$222,234,197
Q1 2024Longleaf PartnersSell-44,497837,878$140,319,429
Q4 2023Renaissance Technologies LLCBuy89,700105,000$15,899
Q4 2023Sequoia Financial AdvisorsBuy3,8953,895$589,788

Frequently asked questions about AMG activity

  • Which institutional owners are buying AMG?

    Institutional owners buying AMG include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in AMG activity?

    "Buy" means an investor increased their reported position in AMG compared to the prior reporting period. This reflects growing exposure to AFFILIATED MANAGERS GROUP (AMG) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in AMG increasing?

    Institutional interest in AMG can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.