Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
611 institutional managers reported holding AOS for the quarter ended Mar 31, 2026. Together they hold about 84% of shares outstanding; the top 10 hold 43%. 76 opened new positions; 97 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 15.45M | 11.10% | $1.02B | added +2.2% | ≤2013 |
| FMR (Fidelity) | 7.93M | 5.70% | $522.9M | added +38.4% | ≤2013 |
| BlackRock | 7.36M | 5.29% | $485.1M | unchanged | ≤2013 |
| State Street | 5.76M | 4.14% | $379.7M | trimmed -2.6% | ≤2013 |
| Invesco | 4.73M | 3.40% | $311.9M | added +3.7% | ≤2013 |
| Impax Asset Management Group plc | 4.28M | 3.07% | $282.1M | trimmed -8% | 2021 Q1 |
| American Century Companies INC | 4.22M | 3.03% | $278.0M | added +5.5% | 2019 Q3 |
| Geode Capital | 3.94M | 2.83% | $259.7M | added +12.6% | ≤2013 |
| Morgan Stanley | 3.58M | 2.57% | $236.1M | added +23.1% | ≤2013 |
| ProShare Advisors LLC | 2.31M | 1.66% | $152.3M | trimmed -1.5% | ≤2013 |
| First Trust Advisors LP | 2.17M | 1.56% | $143.0M | added +10.4% | ≤2013 |
| Earnest Partners LLC | 2.03M | 1.46% | $133.7M | trimmed -2.1% | 2017 Q4 |
| Dimensional Fund Advisors | 1.96M | 1.41% | $129.2M | added +3.4% | ≤2013 |
| Bank OF America CORP /DE/ | 1.69M | 1.21% | $111.3M | trimmed -2.8% | ≤2013 |
| UBS | 1.48M | 1.06% | $97.6M | trimmed -32.8% | ≤2013 |
| BNY Mellon | 1.43M | 1.02% | $94.0M | added +3.1% | ≤2013 |
| SEI Investments CO | 1.35M | 0.97% | $88.8M | unchanged | ≤2013 |
| 1832 Asset Management L.p. | 1.25M | 0.90% | $82.2M | added +3.3% | 2019 Q3 |
| Sarasin & Partners LLP | 1.20M | 0.86% | $79.2M | trimmed -9.4% | 2024 Q3 |
| Goldman Sachs | 1.19M | 0.86% | $78.7M | trimmed -5.7% | ≤2013 |
| Northern Trust | 1.18M | 0.85% | $77.9M | trimmed -1% | ≤2013 |
| Madison Asset Management, LLC | 1.14M | 0.82% | $75.3M | trimmed -5.5% | 2025 Q4 |
| Natixis Advisors, LLC | 1.09M | 0.78% | $71.8M | added +1.8% | ≤2013 |
| Charles Schwab Investment Management | 1.09M | 0.78% | $71.8M | trimmed -1.3% | ≤2013 |
| Gates Capital Management, INC. (focused) | 1.09M | 0.78% | $71.7M | opened | 2026 Q1 |
| Jones Financial Companies Lllp | 1.07M | 0.77% | $70.3M | added +15088.7% | 2023 Q3 |
| Boston Trust Walden CORP | 1.05M | 0.76% | $69.3M | trimmed -2.4% | 2019 Q3 |
| Nomura Asset Management CO LTD | 990.1k | 0.71% | $65.3M | trimmed -16.1% | 2016 Q2 |
| AQR Capital | 978.1k | 0.70% | $64.5M | trimmed -23.5% | ≤2013 |
| Quantinno Capital Management LP | 910.1k | 0.65% | $60.0M | added +70.6% | 2023 Q2 |
| Caisse de depot et placement du Quebec | 907.5k | 0.65% | $59.8M | added +6.7% | 2016 Q3 |
| Vest Financial, LLC | 815.9k | 0.59% | $53.8M | added +0.5% | 2020 Q4 |
| Talaria Asset Management Pty LTD (focused) | 783.9k | 0.56% | $51.7M | opened | 2026 Q1 |
| Royal Bank OF Canada | 770.1k | 0.55% | $50.8M | trimmed -13.3% | ≤2013 |
| Renaissance Technologies | 744.4k | 0.54% | $49.1M | added +17.7% | 2020 Q1 |
| Wells Fargo & COMPANY/MN | 734.0k | 0.53% | $48.4M | added +10% | ≤2013 |
| Pictet Asset Management Holding SA | 703.1k | 0.51% | $46.4M | trimmed -67.8% | ≤2013 |
| Arrowstreet Capital | 607.4k | 0.44% | $40.0M | trimmed -10.1% | 2023 Q3 |
| Welch & Forbes LLC | 579.8k | 0.42% | $38.2M | trimmed -1% | 2020 Q2 |
| Manufacturers Life Insurance Company, THE | 548.5k | 0.39% | $36.2M | trimmed -3.4% | ≤2013 |
| Envestnet Asset Management INC | 527.3k | 0.38% | $34.8M | added +3.1% | ≤2013 |
| Schwartz Investment Counsel INC | 517.7k | 0.37% | $34.1M | unchanged | 2019 Q1 |
| Legal & General Group PLC | 502.3k | 0.36% | $33.1M | added +2.9% | 2015 Q1 |
| Cibc Asset Management INC | 479.6k | 0.34% | $31.6M | trimmed -3.4% | 2015 Q2 |
| KBC Group NV | 457.1k | 0.33% | $30.1M | trimmed -25% | 2014 Q1 |
| Eurizon Capital SGR S.p.A. | 456.2k | 0.33% | $30.1M | added +1.1% | 2025 Q4 |
| Jacobs Levy Equity Management, INC | 441.9k | 0.32% | $29.1M | trimmed -2.7% | 2025 Q4 |
| Deutsche Bank AG\ | 436.2k | 0.31% | $28.8M | added +22.1% | ≤2013 |
| Berkshire Asset Management LLC/PA | 397.4k | 0.29% | $26.2M | added +2.2% | 2025 Q1 |
| Arbejdsmarkedets Tillaegspension | 387.1k | 0.28% | $25.5M | added +10.6% | 2025 Q4 |
Largest 50 of 611 shown; the full ranked, searchable register is at boothcheck.com/holders/AOS. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.