Affiliated Managers Group, Inc.

AMG

Exchange: NYSE
Industry: Investment Advice
SEC CIK: 0001004434

SEC filings (opens in a new tab)

No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 567 institutions reported holding it in 13F filings for Q2 2026, worth $8.53B in total; Southeastern Asset Management (Longleaf) is the only superinvestor holding it.

Other share classesMGR MGRB MGRD MGRE

Q4 2025 vs. Q3 2025

How the institutions holding Affiliated Managers Group, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of AMG: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	451	10	511	+70
Shares	26.5M	15.5K	25.9M	−548.8K (−2.1%)
Value	$6.32B	$3.68M	$7.47B	+$1.16B (+18.3%)

10 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (100)

Institutions that held Affiliated Managers Group, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to AMG in Q4 2025
Institution	Shares	Value	% of portfolio
Norges Bank	394,559	$113.7M	0.01%
Artisan Partners Limited Partnership	130,112	$37.5M	0.06%
Nomura Asset Management International Inc.	122,905	$35.4M	0.05%
Arbejdsmarkedets Tillaegspension	85,807	$24.7M	0.63%
Lord, Abbett & Co. LLC	77,328	$22.3M	0.07%
Loomis Sayles & Co L P	74,280	$21.4M	0.03%
Freestone Grove Partners LP	73,413	$21.2M	0.15%
BW Gestao de Investimentos Ltda.	42,000	$12.1M	0.43%
Qube Research & Technologies Ltd	39,246	$11.3M	0.02%
Schonfeld Strategic Advisors LLC	28,720	$8.28M	0.04%
Longaeva Partners L.P.	26,553	$7.65M	0.91%
Brant Point Investment Management LLC	25,000	$7.21M	1.74%
EAM Investors, LLC	19,138	$5.52M	0.61%
Chase Investment Counsel Corp	17,215	$4.96M	1.39%
Altar Rock LLC	15,542	$4.48M	5.37%
Karl Kapital LLC	14,898	$4.29M	3.81%
Prana Capital Management, LP	14,885	$4.29M	0.16%
Capital Fund Management S.A.	10,926	$3.15M	0.03%
Amundi	10,335	$2.98M	0.00%
Nomura Holdings Inc	9,000	$2.59M	0.01%
Convergence Investment Partners, LLC	7,066	$2.04M	0.41%
Crossmark Global Holdings, Inc.	6,127	$1.77M	0.03%
Asset Management One Co.,Ltd.	5,920	$1.73M	0.00%
Susquehanna Fundamental Investments, LLC	5,374	$1.55M	0.05%
Private Client Services, LLC	5,294	$1.53M	0.48%
Altfest L J & Co Inc	4,089	$1.18M	0.13%
Numerai GP LLC	3,736	$1.08M	0.13%
Lecap Asset Management Ltd	3,685	$1.06M	0.42%
Evolve Private Wealth, LLC	3,399	$979.9K	0.06%
EP Wealth Advisors, LLC	2,992	$862.4K	0.00%
Axq Capital, LP	2,404	$693.0K	0.16%
Kathmere Capital Management, LLC	2,025	$583.8K	0.04%
Hudson Bay Capital Management LP	1,800	$518.9K	0.00%
Massar Capital Management, LP	1,730	$498.7K	0.10%
Boothbay Fund Management, LLC	1,514	$436.5K	0.01%
BTC Capital Management, Inc.	1,499	$432.7K	0.03%
Investors Towarzystwo Funduszy Inwestycyjnych Spolka Akcyjna	1,500	$432.4K	0.16%
Glenmede Trust Co NA	1,492	$430.1K	0.00%
Levin Capital Strategies, L.P.	1,454	$419.2K	0.04%
CenterBook Partners LP	1,388	$400.1K	0.02%
Index Technologies Group LLC	1,378	$397.3K	0.41%
Natixis	1,281	$369.3K	0.00%
Fulton Bank, N.A.	1,262	$363.8K	0.01%
Laird Norton Trust Company, LLC	1,155	$333.0K	0.01%
Guggenheim Capital LLC	1,100	$317.1K	0.00%
Bailard, Inc.	1,076	$310.2K	0.01%
North Dakota State Investment Board	975	$281.1K	0.01%
Inceptionr LLC	967	$278.8K	0.08%
Elevated Financial Group LLC	956	$275.6K	0.10%
Great Valley Advisor Group, Inc.	924	$266.4K	0.01%
Skopos Labs, Inc.	911	$266.1K	0.01%
Magnetar Financial LLC	912	$262.9K	0.00%
U.S. Capital Wealth Advisors, LLC	880	$253.7K	0.01%
PCM Encore, LLC	877	$252.8K	0.05%
Sagewood Asset Management LP	870	$250.8K	0.09%
Investment Partners Asset Management, Inc.	836	$241.0K	0.15%
Exchange Traded Concepts, LLC	824	$237.5K	0.00%
R Squared Ltd	814	$234.7K	0.11%
Nicolet Bankshares Inc	803	$231.5K	0.04%
First Nebraska Trust Co	799	$230.3K	0.02%
Johnson Investment Counsel Inc	789	$227.5K	0.00%
Inscription Capital, LLC	788	$227.2K	0.02%
Mangrove Partners	775	$223.4K	0.02%
Baron Wealth Management LLC	771	$222.3K	0.07%
Ashton Thomas Private Wealth, LLC	769	$221.7K	0.01%
DGS Capital Management, LLC	763	$220.0K	0.04%
Ironwood Investment Counsel, LLC	745	$214.8K	0.03%
Wedmont Private Capital	671	$206.5K	0.01%
JBF Capital, Inc.	700	$201.8K	0.03%
Integrated Quantitative Investments LLC	700	$201.8K	0.04%
Basepoint Wealth LLC	347	$100.0K	0.06%
Torren Management, LLC	283	$81.6K	0.04%
Tema ETFs LLC	252	$72.6K	0.01%
Highlander Partners, L.P.	235	$67.7K	0.02%
CFG Wealth Management Services, Inc.	207	$59.7K	0.05%
Caitong International Asset Management Co., Ltd	146	$42.1K	0.01%
Ancora Advisors, LLC	119	$34.3K	0.00%
SageView Advisory Group, LLC	104	$30.0K	0.00%
Leonteq Securities AG	104	$30.0K	0.00%
Elyxium Wealth, LLC	75	$21.6K	0.01%
Atlas Capital Advisors LLC	59	$17.0K	0.00%
Pinnacle Wealth Planning Services, Inc.	37	$10.7K	0.00%
Aster Capital Management (DIFC) Ltd	30	$8.65K	0.00%
Keating Financial Advisory Services, Inc.	21	$6.05K	0.00%
Signature Equity Partners, LLC	18	$5.19K	0.00%
Basecamp Wealth Advisors LLC	17	$4.90K	0.00%
Marquette Asset Management, LLC	13	$3.75K	0.00%
Manchester Capital Management LLC	11	$3.17K	0.00%
ZRC Wealth Management, LLC	10	$2.88K	0.00%
Investors Portfolio Services LLC	9	$2.62K	0.00%
North Star Investment Management Corp.	9	$2.60K	0.00%
Ares Financial Consulting, LLC	8	$2.31K	0.00%
Optima Capital LLC	7	$2.02K	0.00%
Cape Investment Advisory, Inc.	5	$1.44K	0.00%
Spire Wealth Management	3	$865	0.00%
Cornerstone Planning Group LLC	2	$627	0.00%
Larson Financial Group LLC	2	$577	0.00%
SHP Wealth Management	2	$577	0.00%
Murphy & Mullick Capital Management Corp	2	$577	0.00%
Wealth Enhancement Trust Services, Inc.	1	$288	0.00%

Sold out (30)

Institutions that held Affiliated Managers Group, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of AMG in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Macquarie Group Ltd	87,601	$20.9M
Paragon Associates & Paragon Associates II Joint Venture	22,467	$5.36M
Oppenheimer Asset Management Inc.	15,728	$3.75M
Healthcare of Ontario Pension Plan Trust Fund	12,100	$2.89M
Two Sigma Investments, LP	7,495	$1.79M
Interval Partners, LP	6,703	$1.60M
Redwood Investment Management, LLC	5,032	$1.20M
Point72 Asset Management, L.P.	3,779	$901.0K
Kovitz Investment Group Partners, LLC	3,577	$852.8K
Landscape Capital Management, L.L.C.	3,126	$745.3K
Dodge & Cox	2,400	$572.2K
AdvisorShares Investments LLC	2,365	$563.9K
Empowered Funds, LLC	2,335	$556.7K
Toroso Investments, LLC	1,731	$412.7K
Farringdon Capital, Ltd.	896	$213.6K
KBC Group NV	873	$208.0K
Ci Investments Inc.	629	$150.0K
Principal Securities, Inc.	315	$75.0K
BI Asset Management Fondsmaeglerselskab A/S	216	$52.0K
Rise Advisors, LLC	75	$17.9K
Wealthspire Advisors, LLC	63	$15.0K
Optiver Holding B.V.	52	$12.4K
North Capital, Inc.	30	$7.15K
Caldwell Sutter Capital, Inc.	19	$4.53K
Mather Group, LLC.	17	$4.05K
Tortoise Investment Management, LLC	13	$3.10K
JPL Wealth Management, LLC	9	$2.15K
S&T Bank	8	$1.91K
Cloud Capital Management, LLC	5	$1.00K
Logan Capital Management Inc	4	$954

Not filed for Q4 2025 yet (10)

Institutions that held Affiliated Managers Group, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding AMG in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Cubist Systematic Strategies, LLC	7,215	$1.72M
Point72 Hong Kong Ltd	2,287	$545.3K
Glenmede Investment Management, LP	1,792	$427.3K
Point72 Asia (Singapore) Pte. Ltd.	1,416	$337.6K
Point72 (DIFC) Ltd	1,358	$323.9K
Lingohr & Partner Asset Management GmbH	843	$201.0K
Shell Asset Management Co	460	$110.0K
Hemington Wealth Management	49	$11.0K
FSA Wealth Management LLC	23	$5.48K
Binnacle Investments Inc	12	$2.86K