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.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2018Renaissance Technologies LLCBuy558,800962,300$93,767
Q4 2018Longleaf PartnersBuy664,8101,839,616$179,252
Q4 2018Ariel Appreciation FundBuy135,128403,025$39,271
Q3 2018Jensen Investment ManagementBuy1,1304,460$610
Q3 2018Torray FundBuy374,810$658
Q3 2018Renaissance Technologies LLCBuy326,531403,500$55,167
Q3 2018Longleaf PartnersBuy1,174,8061,174,806$160,620
Q3 2018Ariel Appreciation FundBuy267,897267,897$36,627
Q2 2018Jensen Investment ManagementBuy5403,330$495
Q2 2018Torray FundSell-5974,773$710
Q1 2018Jensen Investment ManagementBuy9702,790$529
Q1 2018Torray FundBuy2585,370$1,018
Q4 2017Torray FundBuy9825,112$1,049
Q4 2017Jensen Investment ManagementBuy1,8201,820$374
Q3 2017Torray FundBuy324,130$784
Q2 2017Torray FundSell-1454,098$680
Q2 2017Renaissance Technologies LLCSell-73176,969$12,766
Q1 2017Torray FundSell-4,2124,243$696
Q4 2016Torray FundBuy7,0708,455$1,229
Q4 2016Meritage GroupSell-75,04524,955$3,626
Q4 2016Arbiter Partners Capital ManagementBuy33,58533,585$4,880
Q3 2016Renaissance Technologies LLCBuy20,30077,700$11,243
Q3 2016Meritage GroupBuy100,000100,000$14,470
Q4 2015Renaissance Technologies LLCSell-156,80057,400$9,170
Q3 2015Renaissance Technologies LLCBuy176,200214,200$36,626
Q2 2015Renaissance Technologies LLCSell-132,90038,000$8,307
Q1 2015Renaissance Technologies LLCBuy81,000170,900$36,706
Q4 2014Renaissance Technologies LLCBuy45,40089,900$19,080
Q3 2014Renaissance Technologies LLCSell-77,50044,500$8,916
Q2 2014Torray FundBuy1,3851,385$284

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.