Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
344 institutional managers reported holding ASO for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 66%. 48 opened new positions; 65 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 9.98M | 14.69% | $563.4M | unchanged | 2020 Q4 |
| BlackRock | 9.85M | 14.49% | $555.7M | unchanged | 2020 Q4 |
| Vanguard Group | 7.36M | 10.83% | $415.3M | added +1.1% | 2020 Q4 |
| Dimensional Fund Advisors | 4.03M | 5.93% | $227.4M | added +1.8% | 2021 Q3 |
| LSV Asset Management | 3.05M | 4.49% | $172.1M | unchanged | 2022 Q1 |
| State Street | 2.66M | 3.92% | $150.4M | trimmed -1.9% | 2020 Q4 |
| American Century Companies INC | 2.40M | 3.53% | $135.4M | added +5.2% | 2021 Q2 |
| Geode Capital | 2.09M | 3.08% | $118.2M | added +4.4% | 2020 Q4 |
| Westwood Holdings Group INC | 1.60M | 2.36% | $90.5M | trimmed -10.6% | 2021 Q2 |
| King Luther Capital Management CORP | 1.55M | 2.28% | $87.6M | trimmed -1.3% | 2021 Q3 |
| Morgan Stanley | 1.08M | 1.59% | $60.8M | trimmed -33.1% | 2020 Q4 |
| Royce & Associates | 1.04M | 1.53% | $58.8M | trimmed -9.6% | 2022 Q3 |
| Stephens Investment Management Group LLC | 1.00M | 1.48% | $56.7M | trimmed -18.6% | 2023 Q4 |
| Nomura Asset Management International INC. | 924.1k | 1.36% | $52.2M | added +9.9% | 2025 Q3 |
| Hood River Capital Management LLC | 907.2k | 1.33% | $51.2M | trimmed -1.9% | 2024 Q4 |
| Allianz Asset Management GmbH | 861.4k | 1.27% | $48.6M | added +13.7% | 2021 Q1 |
| Maple Rock Capital Partners INC. (focused) | 840.0k | 1.24% | $47.4M | opened | 2026 Q1 |
| Marshall Wace | 839.6k | 1.24% | $47.4M | added +153.2% | 2025 Q1 |
| Charles Schwab Investment Management | 836.7k | 1.23% | $47.2M | added +1.9% | 2020 Q4 |
| Invesco | 776.1k | 1.14% | $43.8M | trimmed -6.9% | 2021 Q1 |
| UBS | 748.5k | 1.10% | $42.2M | added +45.2% | 2020 Q4 |
| Northern Trust | 688.8k | 1.01% | $38.9M | added +4.5% | 2020 Q4 |
| Goldman Sachs | 586.0k | 0.86% | $33.1M | trimmed -15% | 2020 Q4 |
| BNY Mellon | 584.2k | 0.86% | $33.0M | trimmed -0.9% | 2020 Q4 |
| Bessemer Group INC | 543.1k | 0.80% | $30.7M | added +12.2% | 2023 Q2 |
| Franklin Resources | 533.1k | 0.78% | $30.1M | added +347.4% | 2021 Q3 |
| Greatmark Investment Partners, INC. | 526.0k | 0.77% | $29.7M | added +0.6% | 2024 Q4 |
| Bank OF America CORP /DE/ | 491.1k | 0.72% | $27.7M | trimmed -22.4% | 2020 Q4 |
| Crawford Investment Counsel INC | 456.9k | 0.67% | $25.8M | unchanged | 2022 Q1 |
| Principal Financial Group INC | 438.5k | 0.65% | $24.7M | added +38.1% | 2021 Q2 |
| Pacifica Capital Investments, LLC (focused) | 436.0k | 0.64% | $24.6M | trimmed -3.4% | 2023 Q3 |
| Jane Street | 400.4k | 0.59% | $22.6M | added +6741.9% | 2025 Q4 |
| SEI Investments CO | 335.9k | 0.49% | $19.0M | added +13.2% | 2021 Q2 |
| Heartland Advisors INC | 329.4k | 0.48% | $18.6M | added +1.3% | 2024 Q2 |
| Hodges Capital Management INC. | 322.2k | 0.47% | $18.2M | added +17.3% | 2021 Q2 |
| Systematic Financial Management LP | 313.5k | 0.46% | $17.7M | trimmed -2% | 2021 Q1 |
| Nuveen | 307.3k | 0.45% | $17.3M | trimmed -11.2% | 2020 Q4 |
| Russell Investments Group, LTD. | 283.4k | 0.42% | $16.0M | trimmed -4.2% | 2021 Q1 |
| Hook Mill Capital Partners, LP (focused) | 280.1k | 0.41% | $15.8M | added +100.3% | 2022 Q4 |
| Envestnet Asset Management INC | 266.2k | 0.39% | $15.0M | added +8.7% | 2022 Q1 |
| Baird Financial Group, INC. | 261.4k | 0.39% | $14.8M | added +4.4% | 2022 Q4 |
| Public Sector Pension Investment Board | 238.6k | 0.35% | $13.5M | added +3.5% | 2022 Q1 |
| Point72 | 205.3k | 0.30% | $11.6M | trimmed -87.5% | 2025 Q2 |
| Glenmede Trust CO NA | 193.7k | 0.28% | $10.9M | trimmed -3.8% | 2024 Q1 |
| Deprince Race & Zollo INC | 193.4k | 0.28% | $10.9M | opened | 2026 Q1 |
| Rhumbline Advisers | 192.7k | 0.28% | $10.9M | added +1.9% | 2020 Q4 |
| Cinctive Capital Management LP | 179.0k | 0.26% | $10.1M | added +13.3% | 2025 Q2 |
| Ceredex Value Advisors LLC | 173.2k | 0.26% | $9.8M | trimmed -66.2% | 2025 Q3 |
| Squarepoint Ops LLC | 164.4k | 0.24% | $9.3M | trimmed -50.5% | 2025 Q2 |
| Legal & General Group PLC | 164.3k | 0.24% | $9.3M | trimmed -7.6% | 2020 Q4 |
Largest 50 of 344 shown; the full ranked, searchable register is at boothcheck.com/holders/ASO. 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.