Affiliated Managers Group

AMG • NYSE

Affiliated Managers Group is a asset management company in the financial services sector on NYSE, led by Jay C. Horgen, with a market cap of $7.8B. As of Q3 2025, 93% of shares are held by 438 institutional investors, with BlackRock, Inc. as the largest holder at 9.93%.

Chief Executive OfficerJay C. Horgen

Market Cap$7.8B

Asset Management

Financial Services

Employees4.0K

Websiteamg.com

Country

United States of America

Overview

Overview of institutional ownership in AMG as of Q3 2025 with a market cap of $6.8B

All Institutions

Institutions: 438
Value Held: $6.3B
Shares Held: 26.4M
Avg Position: $14.4M
Median Position: $706.3K

Hedge Funds

Hedge Funds: 35
Value Held: $735.6M
Shares Held: 3.1M
Avg Position: $21.0M
Median Position: $1.8M

Ownership Breakdown

Institutional (non-HF)

82.01%

$5.6B

Hedge Funds

10.86%

$735.6M

Retail & Other

7.13%

$483.0M

Based on market cap of $6.8B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in AMG as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
B BlackRock, Inc. Institution	-	$672.8M 0.01% of portfolio	9.93% 2.8M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
VANGUARD GROUP INC Institution	Salim Ramji CEO	$661.0M 0.01% of portfolio	9.76% 2.8M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$462.9M 0.03% of portfolio	6.83% 1.9M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
ARIEL INVESTMENTS, LLC Long Only Manager	John Washington Rogers CEO	$301.3M 3.22% of portfolio	4.45% 1.3M shares	Q3 2018 Held for 7y 2m	$9.4B
Clarkston Capital Partners LLC Long Only Manager	Jeffrey Anthony Hakala CEO	$293.8M 6.33% of portfolio	4.34% 1.2M shares	Q4 2018 Held for 6y 11m	$4.6B
Robeco Investment Management, Inc. Long Only Manager	Joseph Francis Feeney CEO	$276.0M 0.28% of portfolio	4.07% 1.2M shares	Q2 2024 Held for 1y 5m	$97.8B
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	Dan Michael Berkovitz Chairman	$242.5M 0.20% of portfolio	3.58% 1.0M shares	≤ Q2 2013 Held for 12y 5m+	$121.98B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$229.8M 0.01% of portfolio	3.39% 963.7K shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$163.1M 0.03% of portfolio	2.41% 684.1K shares	≤ Q2 2013 Held for 12y 5m+	$466.32B
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	Kenneth Cordele Griffin CEO	$153.8M 0.13% of portfolio	2.27% 645.1K shares	≤ Q2 2013 Held for 12y 5m+	$122.08B

Net Capital Flow

Institutional buying and selling activity for AMG in Q3 2025

Traded: +$14.9M
Buyers: 201
Sellers: 193
Total Bought: +$446.4M
Total Sold: −$431.4M
Avg Position: $13.2M

Biggest Buyers

Institution	Net Bought	Current Position
A Alyeska Investment Group, L.P. Hedge Fund•Multi-Strategy	+$70.4M +295.1K shares	$70.4M 295.1K shares
UBS Group AG Institution	+$41.2M +172.8K shares	$83.5M 350.2K shares
Holocene Advisors, LP Hedge Fund•Long/Short	+$36.5M +153.0K shares	$60.5M 253.9K shares
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC Fund of Funds	+$23.5M +98.6K shares	$24.1M 100.9K shares
RAYMOND JAMES FINANCIAL INC RIA/Wealth	+$17.9M +75.1K shares	$46.0M 192.9K shares
ALLIANCEBERNSTEIN L.P. Long Only Manager	+$17.7M +74.1K shares	$27.4M 115.0K shares
R ROYAL BANK OF CANADA Institution	+$14.9M +62.4K shares	$19.3M 81.1K shares
C Concentric Capital Strategies, LP Hedge Fund•Long/Short	+$14.3M +60.2K shares	$14.3M 60.2K shares
A Allianz Asset Management AG Institution	+$12.0M +50.2K shares	$93.7M 393.2K shares
LYRICAL ASSET MANAGEMENT LP Private Equity	+$9.7M +40.8K shares	$138.3M 579.8K shares

Biggest Sellers

Institution	Net Sold	Current Position
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$131.7M −552.2K shares	$242.5M 1.0M shares
Clarkston Capital Partners LLC Long Only Manager	−$48.4M −203.0K shares	$293.8M 1.2M shares
Bridgewater Associates, LP Hedge Fund•Global Macro	−$22.9M −95.9K shares	$3.4M 14.3K shares
ARIEL INVESTMENTS, LLC Long Only Manager	−$21.8M −91.3K shares	$301.3M 1.3M shares
MORGAN STANLEY RIA/Wealth	−$18.1M −76.0K shares	$462.9M 1.9M shares
FIRST TRUST ADVISORS LP ETF Provider	−$17.5M −73.2K shares	$38.5M 161.5K shares
JACOBS LEVY EQUITY MANAGEMENT, INC Hedge Fund•Quant	−$14.8M −62.1K shares	$9.1M 38.4K shares
L LGT CAPITAL PARTNERS LTD. Institution	−$12.3M −51.7K shares	$2.4M 10.1K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$11.4M −47.6K shares	$26.9M 112.6K shares
BARCLAYS PLC Institution	−$11.3M −47.5K shares	$11.3M 47.3K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited AMG in Q3 2025

New Positions: 26
New Value: $28.6M
Exited Positions: 37
Exited Value: $38.2M

New Positions

Institution	Position Value
C Concentric Capital Strategies, LP Hedge Fund•Long/Short	$14.3M 60.2K shares
P PARAGON ASSOCIATES & PARAGON ASSOCIATES II JOINT VENTURE Institution	$5.4M 22.5K shares
M Mubadala Investment Co PJSC Institution	$3.1M 13.0K shares
IEQ CAPITAL, LLC RIA/Wealth	$2.5M 10.5K shares
Williamson Legacy Group, LLC RIA/Wealth	$964.9K 4.0K shares
MANNING & NAPIER ADVISORS LLC RIA/Wealth	$296.0K 1.2K shares
SYON CAPITAL LLC RIA/Wealth	$235.8K 989.0 shares
COOKSON PEIRCE & CO INC RIA/Wealth	$233.9K 981.0 shares
Cooper Financial Group RIA/Wealth	$226.7K 951.0 shares
T TRANSCEND WEALTH COLLECTIVE, LLC RIA/Wealth	$226.3K 949.0 shares

Exited Positions

Institution	Previous Position
T TEXAS PERMANENT SCHOOL FUND Institution	$5.1M 25.7K shares
I Invenomic Capital Management LP Hedge Fund•Long/Short	$4.4M 22.4K shares
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	$3.7M 18.9K shares
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$3.2M 16.5K shares
B BASSWOOD CAPITAL MANAGEMENT, L.L.C. Hedge Fund•Long/Short	$3.1M 16.0K shares
X XTX Topco Ltd Institution	$2.4M 12.0K shares
NGAM ADVISORS, L.P. Long Only Manager	$2.3M 11.9K shares
Point72 Europe LLP Digital Asset Manager	$2.1M 10.8K shares
B Bastion Asset Management Inc. Institution	$1.8M 9.8K shares
Q Qube Research & Technologies Ltd Institution	$1.6M 7.9K shares

Options Activity

Institutions with the largest Call and Put options positions in AMG as of Q3 2025

Call Positions: 5
Call Value: $4.0M
Put Positions: 4
Put Value: $3.1M

Call Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$3.1M 131.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$667.6K 28.0 contracts
W WOLVERINE TRADING, LLC Institution	$238.7K 10.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	- - contracts
P PUFF WEALTH MANAGEMENT, LLC Institution	- - contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$2.5M 106.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$381.5K 16.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$166.9K 7.0 contracts
Walleye Trading LLC RIA/Wealth	- - contracts

Most Committed Institutions

Institutions with AMG as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
Kiltearn Partners LLP Long Only Manager	Murdoch Ross Murchison CEO	13.56% $67.7M	1.00% 283.8K shares	Q4 2018 Held for 6y 11m	$498.9M
P PARAGON ASSOCIATES & PARAGON ASSOCIATES II JOINT VENTURE Institution	-	9.55% $5.4M	0.08% 22.5K shares	Q3 2025 Held for 2 months	$56.1M
Clarkston Capital Partners LLC Long Only Manager	Jeffrey Anthony Hakala CEO	6.33% $293.8M	4.34% 1.2M shares	Q4 2018 Held for 6y 11m	$4.6B
BRUNI J V & CO /CO RIA/Wealth	John Roy Brock President	6.14% $60.8M	0.90% 255.0K shares	≤ Q2 2013 Held for 12y 5m+	$990.7M
Goodman Financial CORP RIA/Wealth	Steven Robert Goodman President	3.73% $19.1M	0.28% 80.3K shares	Q3 2024 Held for 1y 2m	$513.7M
ARIEL INVESTMENTS, LLC Long Only Manager	John Washington Rogers CEO	3.22% $301.3M	4.45% 1.3M shares	Q3 2018 Held for 7y 2m	$9.4B
Channing Capital Management, LLC Long Only Manager	Rodney Bernard Herenton CEO	2.67% $101.3M	1.50% 425.0K shares	Q4 2020 Held for 4y 11m	$3.8B
W Wallace Capital Management Inc. Hedge Fund•Multi-Strategy	Christopher Lee Thomason President	1.98% $16.0M	0.24% 66.9K shares	Q3 2019 Held for 6y 2m	$804.5M
LYRICAL ASSET MANAGEMENT LP Private Equity	Andrew Brian Wellington CIO	1.95% $138.3M	2.04% 579.8K shares	Q1 2017 Held for 8y 8m	$7.1B
C CWC Advisors, LLC. RIA/Wealth	Thane Alan Cleland CEO	1.90% $3.9M	0.06% 16.3K shares	Q3 2024 Held for 1y 2m	$204.2M