Affiliated Managers Group, Inc. (AMG) Ownership
AMG ownership summary
as of October 18, 2026- Institutions
- 100.6% of shares outstanding
- Insiders
- 4.23% of shares outstanding
- Shares outstanding
- 25.9M
- Float
- 24.8M shares available to trade
- Short interest
- 5.25% 1.0M shares short
- Days to cover
- 3.31 short interest up 16.2% vs prior month
- Institutions 100.57%
- Insiders 4.23%
AMG top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 10.72% | 2.8M | $1.06B | −94,929 (−3.3%) | June 30, 2026 |
| 2 | Morgan Stanley - Brokerage Accounts | 5.75% | 1.5M | $570.7M | −245,293 (−14.2%) | June 30, 2026 |
| 3 | Vanguard Portfolio Management, LLC | 5.38% | 1.4M | $534.1M | +32,043 (+2.4%) | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 4.45% | 1.2M | $441.7M | −23,661 (−2.0%) | June 30, 2026 |
| 5 | Boston Partners Global Investors, Inc | 3.87% | 1.0M | $384.5M | +30,720 (+3.2%) | June 30, 2026 |
| 6 | Ariel Investments, LLC | 3.87% | 1000K | $383.6M | −64,354 (−6.0%) | June 30, 2026 |
| 7 | State Street Corp | 3.42% | 883K | $339.0M | −43,410 (−4.7%) | June 30, 2026 |
| 8 | Millennium Management LLC | 3.38% | 875K | $335.8M | +869,748 (+16,202.5%) | June 30, 2026 |
| 9 | Fuller & Thaler Asset Management Inc | 3.32% | 858K | $329.2M | +97,543 (+12.8%) | June 30, 2026 |
| 10 | Dimensional Fund Advisors, Inc. | 2.59% | 670K | $257.2M | −48,118 (−6.7%) | June 30, 2026 |
| 11 | Geode Capital Management, LLC | 2.28% | 591K | $226.7M | −45,021 (−7.1%) | June 30, 2026 |
| 12 | LSV Asset Management | 2.06% | 534K | $204.8M | +56,800 (+11.9%) | June 30, 2026 |
| 13 | Lyrical Asset Management LP | 1.83% | 473K | $181.5M | −29,235 (−5.8%) | June 30, 2026 |
| 14 | Allianz Asset Management AG | 1.76% | 454K | $174.2M | −34,753 (−7.1%) | June 30, 2026 |
| 15 | Bank of America Corp | 1.67% | 432K | $165.9M | +22,842 (+5.6%) | June 30, 2026 |
| 16 | Amvescap Plc. | 1.47% | 381K | $146.1M | +64,133 (+20.3%) | June 30, 2026 |
| 17 | NORGES BANK | 1.40% | 361K | $138.7M | −33,086 (−8.4%) | June 30, 2026 |
| 18 | Northern Trust Corp | 1.25% | 323K | $123.8M | −26,212 (−7.5%) | June 30, 2026 |
| 19 | Jane Street Group LLC | 1.20% | 309K | $118.6M | +56,629 (+22.4%) | June 30, 2026 |
| 20 | Channing Capital Management, LLC | 1.17% | 303K | $116.1M | −158 (−0.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 1.2M shares and 12 cut 688K.
AMG top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | iShares Core S&P Mid-Cap ETF | 3.56% | 921K | $353.5M | −324 (−0.0%) | September 30, 2026 |
| 2 | FullerThaler Behavioral Sm-Cp Eq R6 | 3.15% | 816K | $313.1M | +86,190 (+11.8%) | June 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.08% | 796K | $305.4M | −2,961 (−0.4%) | August 31, 2026 |
| 4 | Eaton Vance Atlanta Capital SMID-Cap I | 2.94% | 761K | $292.1M | −8,300 (−1.1%) | August 31, 2026 |
| 5 | JHancock Disciplined Value Mid Cap I | 2.58% | 666K | $255.6M | −10,848 (−1.6%) | August 31, 2026 |
| 6 | Vanguard Small Cap Index | 2.14% | 553K | $212.1M | −24,491 (−4.2%) | September 30, 2026 |
| 7 | Vanguard MStar Small Cap Value Index | 1.39% | 360K | $138.1M | −6,764 (−1.8%) | September 30, 2026 |
| 8 | Ariel Fund Investor | 1.09% | 281K | $107.8M | — | September 30, 2026 |
| 9 | Vanguard Strategic Equity Inv | 0.84% | 216K | $83.1M | +50,628 (+30.5%) | June 30, 2026 |
| 10 | PIMCO RAE US Small Instl | 0.81% | 211K | $80.8M | −24,121 (−10.3%) | June 30, 2026 |
| 11 | Invesco S&P MidCap Momentum ETF | 0.80% | 207K | $79.5M | — | September 30, 2026 |
| 12 | State Street® SPDR® S&P MIDCAP 400® ETF | 0.74% | 191K | $73.4M | −1,947 (−1.0%) | September 30, 2026 |
| 13 | FI Instl US Sm & Md-Cp Cor Eq USD | 0.59% | 152K | $58.2M | +4,586 (+3.1%) | August 31, 2026 |
| 14 | iShares S&P Mid-Cap 400 Growth ETF | 0.58% | 149K | $57.3M | −160 (−0.1%) | September 30, 2026 |
| 15 | State Street SPDR Port S&P 400 Md CpETF | 0.53% | 137K | $52.5M | −192 (−0.1%) | September 30, 2026 |
| 16 | Schwab US Small-Cap ETF™ | 0.53% | 136K | $52.2M | +90 (+0.1%) | September 30, 2026 |
| 17 | DFA US Small Cap I | 0.51% | 133K | $51.0M | — | August 31, 2026 |
| 18 | Fidelity Extended Market Index | 0.50% | 128K | $49.2M | −1,535 (−1.2%) | August 31, 2026 |
| 19 | iShares Russell Mid-Cap ETF | 0.41% | 105K | $40.4M | +190 (+0.2%) | September 30, 2026 |
| 20 | Fidelity Mid Cap Index | 0.38% | 97K | $37.2M | +362 (+0.4%) | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
AMG insider transactions
latest 3| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-09 | Kavita Padiyar | Sell | $278.24 | 2,200 | $612,128 |
| 2026-03-06 | Thomas M Wojcik | Sell | $286.30 | 8,000 | $2.3M |
| 2025-09-09 | Thomas M Wojcik | Sell | $231.03 | 16,000 | $3.7M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
AMG shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns AMG
Institutional investors own 100.6% of Affiliated Managers's shares and insiders 4.23%. The largest holder is BlackRock Inc with 10.72% of the shares (2.8M), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 12 reduced their stake in the latest filings. Short interest is 5.25% of the float, or 3.31 days of average trading volume. The share count fell 46.2% since 2014.
Related: AMG analyst forecast, AMG key metrics, AMG dividend history. See the AMG stock overview for the latest quote and news.
AMG ownership FAQ
Who owns the most Affiliated Managers stock?
The largest shareholders of Affiliated Managers are BlackRock Inc (10.72%), Morgan Stanley - Brokerage Accounts (5.75%), Vanguard Portfolio Management, LLC (5.38%), Vanguard Capital Management, LLC (4.45%), Boston Partners Global Investors, Inc (3.87%).
What percentage of Affiliated Managers is owned by institutions?
Institutions hold 100.6% of Affiliated Managers's shares outstanding; insiders hold 4.23%.
Which funds own Affiliated Managers?
The largest fund holders of Affiliated Managers are iShares Core S&P Mid-Cap ETF (3.56%), FullerThaler Behavioral Sm-Cp Eq R6 (3.15%), Vanguard MStar Total Stk Mkt Idx Invest (3.08%), Eaton Vance Atlanta Capital SMID-Cap I (2.94%), JHancock Disciplined Value Mid Cap I (2.58%).
What is Affiliated Managers's short interest?
1.0M shares of Affiliated Managers were sold short, 5.25% of the float; at the average daily volume it would take 3.31 days to cover.
Are insiders buying or selling Affiliated Managers?
Of the latest 3 reported insider transactions in Affiliated Managers (since September 9, 2025), 0 were purchases and 3 were sales.
How many shares of Affiliated Managers are outstanding?
Affiliated Managers has 25.9M shares outstanding, of which 24.8M are in the public float.