# AFFILIATED MANAGERS GROUP COM

AFFILIATED MANAGERS GROUP COM is a security (CUSIP 008252108) tracked across SEC portfolio filings. 572 institutional managers reported $6.7B on Form 13F as of 2026-06-30; 37 registered fund positions totaling $555.0M via N-PORT as of 2026-05-31.

## Summary

- Issuer: AFFILIATED MANAGERS GROUP
- Class: COM
- CUSIP: 008252108
- Asset category: EC
- 13F holders: 572
- 13F value: $6.7B
- 13F period: 2026-06-30
- N-PORT fund positions: 37
- N-PORT value: $555.0M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 572 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| BlackRock, Inc. | New York, NY | $793.5M | 2,867,665 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $773.6M | 2,683,585 |
| MORGAN STANLEY | NEW YORK, NY | $479.4M | 1,732,512 |
| Boston Partners | BOSTON, MA | $339.1M | 1,001,967 |
| ARIEL INVESTMENTS, LLC | CHICAGO, IL | $294.4M | 1,064,030 |
| STATE STREET CORP | BOSTON, MA | $256.4M | 926,733 |
| FULLER & THALER ASSET MANAGEMENT, INC. | San Mateo, CA | $210.4M | 760,213 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $198.7M | 718,313 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $176.0M | 635,778 |
| [LYRICAL ASSET MANAGEMENT LP](https://search.stillhousedata.com/firm/148267) | NEW YORK, NY | $138.9M | 502,121 |
| Allianz Asset Management GmbH | MUNICH, 2M | $135.2M | 488,742 |
| BANK OF AMERICA CORP /DE/ | CHARLOTTE, NC | $113.3M | 409,578 |
| [Channing Capital Management, LLC](https://search.stillhousedata.com/firm/128450) | Chicago, IL | $102.4M | 302,514 |
| NORTHERN TRUST CORP | CHICAGO, IL | $96.5M | 348,882 |
| Bank of New York Mellon Corp | NEW YORK, NY | $95.4M | 281,967 |

## Top fund holders (N-PORT)

_Showing 15 of 37 fund positions by value._

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| State Street SPDR S&P MidCap 400SM ETF Trust | SPDR S&P MIDCAP 400 ETF TRUST | $234.7M | 96.90% |
| [Ariel Fund](https://search.stillhousedata.com/fund/S000005024) | Ariel Investment Trust | $93.0M | 363.26% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $86.9M | 10.66% |
| [VANGUARD STRATEGIC EQUITY FUND](https://search.stillhousedata.com/fund/S000002593) | VANGUARD HORIZON FUNDS | $45.9M | 45.35% |
| [AB DISCOVERY GROWTH FUND, INC.](https://search.stillhousedata.com/fund/S000010117) | AB DISCOVERY GROWTH FUND, INC. | $25.5M | 94.57% |
| [LORD ABBETT MID CAP STOCK FUND INC](https://search.stillhousedata.com/fund/S000001450) | LORD ABBETT MID CAP STOCK FUND INC | $16.3M | 150.26% |
| CALAMOS STRATEGIC TOTAL RETURN FUND | CALAMOS STRATEGIC TOTAL RETURN FUND | $10.4M | 29.97% |
| [Columbia Mid Cap Index Fund](https://search.stillhousedata.com/fund/S000010826) | COLUMBIA FUNDS SERIES TRUST | $6.1M | 23.95% |
| [Large Cap Index Master Portfolio](https://search.stillhousedata.com/fund/S000033023) | Master Investment Portfolio | $4.6M | 1.27% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $4.0M | 0.67% |
| [T. Rowe Price Financial Services Fund, Inc.](https://search.stillhousedata.com/fund/S000002084) | T. ROWE PRICE FINANCIAL SERVICES FUND, INC. | $3.9M | 22.19% |
| [VANGUARD INSTITUTIONAL TOTAL STOCK MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002855) | VANGUARD INSTITUTIONAL INDEX FUNDS | $3.4M | 1.11% |
| [BNY Mellon Midcap Index Fund, Inc.](https://search.stillhousedata.com/fund/S000000078) | BNY MELLON MIDCAP INDEX FUND, INC. | $3.3M | 23.95% |
| [VANGUARD MARKET NEUTRAL FUND](https://search.stillhousedata.com/fund/S000019457) | VANGUARD MONTGOMERY FUNDS | $3.1M | 70.96% |
| [Reinhart Mid Cap PMV Fund](https://search.stillhousedata.com/fund/S000037193) | Managed Portfolio Series | $2.9M | 329.17% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/008252108.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.