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Affiliated Managers Group, Inc.

AMG
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NYSE
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SEC CIK
0001004434

No open-market purchases or sales by Affiliated Managers Group, Inc. insiders were filed in the last 90 days; 571 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 classesMGRMGRBMGRDMGRE

SEC filings

10-K, 10-Q, 8-K, 20-F and 40-F reports Affiliated Managers Group, Inc. filed with the SEC, newest first.

Livermore lists each filing's form, 8-K items and dates only. To read a filing, open it on SEC.gov; an 8-K's press release or other attachments, such as exhibit 99.1 for Item 2.02, are in the filing index.

SEC filings by Affiliated Managers Group, Inc.
FiledForm8-K itemsPeriodDocumentFiling index
Nov 9, 202610-Q–Sep 30, 2026SECIndex
Nov 9, 20268-K2.028.019.01Nov 9, 2026SECIndex
Aug 7, 202610-Q–Jun 30, 2026SECIndex
Jul 30, 20268-K2.028.019.01Jul 30, 2026SECIndex
Jun 9, 20268-K1.012.039.01Jun 9, 2026SECIndex
May 28, 20268-K5.07May 27, 2026SECIndex
May 7, 202610-Q–Mar 31, 2026SECIndex
May 1, 20268-K2.028.019.01May 1, 2026SECIndex
Feb 26, 20268-K5.027.019.01Feb 22, 2026SECIndex
Feb 17, 202610-K–Dec 31, 2025SECIndex
Feb 12, 20268-K2.028.019.01Feb 12, 2026SECIndex
Feb 12, 20268-K5.02Feb 10, 2026SECIndex
Dec 11, 20258-K1.012.039.01Dec 8, 2025SECIndex
Dec 8, 20258-K8.01Dec 8, 2025SECIndex
Nov 6, 202510-Q–Sep 30, 2025SECIndex
Nov 3, 20258-K2.028.019.01Nov 3, 2025SECIndex
Aug 14, 20258-K5.027.019.01Aug 11, 2025SECIndex
Aug 7, 202510-Q–Jun 30, 2025SECIndex
Jul 31, 20258-K2.028.019.01Jul 31, 2025SECIndex
Jun 6, 20258-K5.027.019.01Jun 3, 2025SECIndex
May 22, 20258-K5.07May 22, 2025SECIndex
May 8, 202510-Q–Mar 31, 2025SECIndex
May 8, 20258-K2.028.019.01May 8, 2025SECIndex
Mar 7, 20258-K8.019.01Mar 7, 2025SECIndex
Feb 14, 202510-K–Dec 31, 2024SECIndex
Feb 6, 20258-K2.028.019.01Feb 6, 2025SECIndex
Feb 3, 20258-K5.02Jan 30, 2025SECIndex
Nov 15, 20248-K1.012.039.01Nov 15, 2024SECIndex
Nov 7, 202410-Q–Sep 30, 2024SECIndex
Nov 4, 20248-K2.028.019.01Nov 4, 2024SECIndex
Aug 20, 20248-K1.012.039.01Aug 15, 2024SECIndex
Aug 2, 20248-K5.02Aug 2, 2024SECIndex
Aug 2, 202410-Q–Jun 30, 2024SECIndex
Jul 29, 20248-K2.028.019.01Jul 29, 2024SECIndex
May 24, 20248-K5.07May 22, 2024SECIndex
May 7, 202410-Q–Mar 31, 2024SECIndex
May 6, 20248-K2.028.019.01May 6, 2024SECIndex
Mar 25, 20248-K5.027.019.01Mar 22, 2024SECIndex
Mar 20, 20248-K1.012.039.01Mar 14, 2024SECIndex
Feb 16, 202410-K–Dec 31, 2023SECIndex
Feb 5, 20248-K2.028.019.01Feb 5, 2024SECIndex
Nov 6, 202310-Q–Sep 30, 2023SECIndex
Nov 6, 20238-K2.028.019.01Nov 6, 2023SECIndex
Sep 25, 20238-K5.029.01Sep 25, 2023SECIndex
Aug 7, 202310-Q–Jun 30, 2023SECIndex
Jul 26, 20238-K2.028.019.01Jul 26, 2023SECIndex
May 30, 20238-K5.07May 25, 2023SECIndex
May 8, 202310-Q–Mar 31, 2023SECIndex
May 1, 20238-K2.028.019.01May 1, 2023SECIndex
Feb 17, 202310-K–Dec 31, 2022SECIndex