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AFFILIATED MANAGERS GROUP, INC.

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Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

AFFILIATED MANAGERS GROUP, INC.

CIK 0001004434AMGMGRMGRBMGRD· quarter ending 2026-06-30
Shares outstanding
25,859,933
as of 2026-08-05 · 10-Q cover page, filed 2026-08-07
Held by 13F filers
179,200
selection includes debt or preferreds — no % of shares outstanding
Holders
3
+0 vs 2026-03-31 · 0 new, 0 exited
Value
$4.1M
shares -1.9% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-07, as of 2026-08-05)

ClassListedShares outstandingHeld by 13F filers% of classHoldersCUSIP
Common stockAMG · NYSE25,859,93325,232,65897.6%567008252108

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine
CountCUSIPClass (as filers write it)HoldersShares heldClass shares% of classValueOptionsMapped via
008252108COM56725,232,65825,859,93397.6%$8.5B7 call / 6 put13DGholders →
008252827Prefnot common3179,200——$4.1M—NPORTholders →
008252850PUBLICnot common2647——$13K—NPORTholders →
008252843PUBLICnot common2673——$11K—NPORTholders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 5 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (3 of 3 · 008252827)

change vs 2026-03-31
#FilerShares / principal% of classValueChange
1SHIKIAR ASSET MANAGEMENT INC81,000—$1.9M-3,450 (-4.1%)
2IAT REINSURANCE CO LTD.80,000—$1.8M—
3Sterling Capital Management LLC18,200—$413K—

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting personFormFiledEventShares% of class
Morgan StanleySCHEDULE 13G/A2026-08-122026-06-301,458,3795.5%
Atlanta Capital Management Company, LLCSCHEDULE 13G/A2026-08-122026-06-301,238,4464.7%
Vanguard Capital ManagementSCHEDULE 13G2026-04-292026-03-311,386,7445.19%
Vanguard Portfolio ManagementSCHEDULE 13G2026-04-282026-03-311,368,4305.12%
The Vanguard GroupSCHEDULE 13G/A2026-03-262026-03-1300%
Gerald W. HakalaSCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Jeffrey A. HakalaSCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Jeremy J. ModellSCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Modell Capital LLCSCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Clarkston Companies, Inc.SCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Clarkston Capital Partners, LLCSCHEDULE 13G/A2026-02-132025-12-31904,1193.21%
Eaton Vance Atlanta Capital SMID-Cap FundSCHEDULE 13G/A2025-11-072025-09-301,276,0514.5%
Israel A. EnglanderSCHEDULE 13G/A2025-10-302025-09-301,017,1133.6%
Millennium Group Management LLCSCHEDULE 13G/A2025-10-302025-09-301,017,1133.6%
Millennium Management LLCSCHEDULE 13G/A2025-10-302025-09-301,017,1133.6%
Integrated Core Strategies (US) LLCSCHEDULE 13G/A2025-10-302025-09-30974,5963.4%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.