Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
220 institutional managers reported holding OSW for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 54%. 45 opened new positions; 34 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Ariel Investments, LLC | 15.43M | 15.08% | $354.2M | added +10.1% | 2020 Q1 |
| BlackRock | 9.94M | 9.72% | $228.1M | added +34.7% | 2019 Q3 |
| Nomura Asset Management International INC. | 4.47M | 4.37% | $102.5M | added +47.2% | 2025 Q4 |
| Bank OF America CORP /DE/ | 3.99M | 3.90% | $91.5M | added +395% | 2019 Q2 |
| Reinhart Partners, LLC. | 3.88M | 3.80% | $89.2M | added +77.6% | 2025 Q4 |
| Vanguard Group | 3.84M | 3.76% | $88.2M | added +27.4% | 2019 Q2 |
| State Street | 3.82M | 3.73% | $87.6M | added +69.4% | 2019 Q2 |
| Channing Capital Management, LLC | 3.78M | 3.70% | $86.8M | added +17.8% | 2020 Q3 |
| Victory Capital Management INC | 3.72M | 3.64% | $85.4M | added +5.5% | 2023 Q4 |
| Geode Capital | 2.52M | 2.46% | $57.8M | unchanged | 2019 Q2 |
| FMR (Fidelity) | 2.42M | 2.36% | $55.4M | trimmed -44.3% | 2021 Q3 |
| Dimensional Fund Advisors | 2.34M | 2.28% | $53.6M | added +1.2% | 2020 Q4 |
| First Trust Advisors LP | 2.31M | 2.26% | $53.1M | trimmed -27.2% | 2024 Q2 |
| Wellington Management | 2.17M | 2.12% | $49.7M | added +3.1% | 2023 Q4 |
| Raymond James Financial INC | 2.16M | 2.11% | $49.5M | trimmed -3.7% | 2023 Q1 |
| Loomis Sayles & CO L P | 1.93M | 1.89% | $44.4M | trimmed -7.7% | 2024 Q4 |
| NEW South Capital Management INC | 1.78M | 1.74% | $40.9M | trimmed -3.5% | 2019 Q1 |
| American Century Companies INC | 1.71M | 1.67% | $39.2M | trimmed -22.5% | 2022 Q4 |
| Select Equity Group | 1.66M | 1.63% | $38.2M | added +4% | 2021 Q1 |
| Capital International Investors | 1.53M | 1.49% | $35.1M | unchanged | 2023 Q3 |
| Bessemer Group INC | 1.47M | 1.44% | $33.7M | added +30.3% | 2024 Q3 |
| NEW York State Common Retirement Fund | 1.43M | 1.40% | $32.8M | added +12.6% | 2019 Q1 |
| Neumeier Poma Investment Counsel LLC (focused) | 1.32M | 1.29% | $30.3M | trimmed -1.9% | 2024 Q3 |
| Northern Trust | 1.31M | 1.28% | $30.0M | added +14.3% | 2019 Q1 |
| Palisade Capital Management, LP | 1.30M | 1.27% | $29.9M | trimmed -7.4% | 2020 Q1 |
| Goldman Sachs | 1.18M | 1.16% | $27.2M | added +18% | 2019 Q1 |
| Pinnacle Associates LTD | 1.09M | 1.07% | $25.1M | trimmed -5.7% | 2020 Q4 |
| Renaissance Technologies | 1.06M | 1.04% | $24.4M | trimmed -10% | 2022 Q1 |
| Davenport & CO LLC | 1.01M | 0.99% | $23.3M | trimmed -36.4% | 2019 Q1 |
| Charles Schwab Investment Management | 920.5k | 0.90% | $21.1M | added +8.4% | 2019 Q2 |
| Morgan Stanley | 895.0k | 0.88% | $20.5M | added +54.7% | 2019 Q1 |
| Nixon Capital, LLC (focused) | 890.3k | 0.87% | $20.4M | added +1.1% | 2024 Q1 |
| Emerald Advisers, LLC | 884.9k | 0.86% | $20.3M | trimmed -3.1% | 2023 Q4 |
| Royal Bank OF Canada | 868.0k | 0.85% | $19.9M | trimmed -14.7% | 2019 Q2 |
| Aberdeen Group plc | 863.6k | 0.84% | $19.8M | added +1.4% | 2025 Q4 |
| Healthcare OF Ontario Pension Plan Trust Fund | 825.5k | 0.81% | $18.9M | opened | 2026 Q1 |
| Champlain Investment Partners, LLC | 745.6k | 0.73% | $17.1M | trimmed -20% | 2025 Q1 |
| Public Sector Pension Investment Board | 741.3k | 0.72% | $17.0M | opened | 2026 Q1 |
| Fenimore Asset Management INC | 691.0k | 0.68% | $15.9M | trimmed -13% | 2024 Q2 |
| Emerald Mutual Fund Advisers Trust | 600.0k | 0.59% | $13.8M | unchanged | 2023 Q3 |
| BNP Paribas Financial Markets | 596.2k | 0.58% | $13.7M | trimmed -7% | 2019 Q2 |
| UBS | 592.5k | 0.58% | $13.6M | added +3.6% | 2019 Q1 |
| BNY Mellon | 559.4k | 0.55% | $12.8M | added +77.7% | 2019 Q1 |
| Principal Financial Group INC | 539.4k | 0.53% | $12.4M | added +814.1% | 2024 Q1 |
| Franklin Resources | 520.3k | 0.51% | $11.9M | trimmed -41.1% | 2019 Q1 |
| Nuveen | 499.1k | 0.49% | $11.5M | trimmed -14.2% | 2020 Q2 |
| Oberweis Asset Management INC/ | 485.7k | 0.47% | $11.1M | added +1.8% | 2023 Q4 |
| Public Employees Retirement System OF Ohio | 410.7k | 0.40% | $9.4M | unchanged | 2024 Q3 |
| Pier Capital, LLC | 405.1k | 0.40% | $9.3M | trimmed -2% | 2022 Q3 |
| State OF Wisconsin Investment Board | 357.5k | 0.35% | $8.2M | trimmed -10.4% | 2024 Q2 |
Largest 50 of 220 shown; the full ranked, searchable register is at boothcheck.com/holders/OSW. 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.