Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
216 institutional managers reported holding OUST for the quarter ended Mar 31, 2026. Together they hold about 48% of shares outstanding; the top 10 hold 29%. 42 opened new positions; 46 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 5.29M | 8.56% | $97.3M | added +3% | 2021 Q2 |
| Vanguard Group | 4.93M | 7.97% | $90.6M | added +4.4% | 2021 Q2 |
| State Street | 1.63M | 2.64% | $30.0M | added +3.3% | 2021 Q2 |
| Geode Capital | 1.45M | 2.35% | $26.7M | added +2% | 2021 Q2 |
| Penn Capital Management Company, LLC | 969.6k | 1.57% | $17.8M | added +25.1% | 2022 Q1 |
| Tao Capital Management LP (focused) | 845.3k | 1.37% | $15.5M | unchanged | 2021 Q1 |
| D. E. Shaw | 842.1k | 1.36% | $15.5M | trimmed -1.2% | 2023 Q4 |
| Goldman Sachs | 826.2k | 1.34% | $15.2M | added +121.5% | 2021 Q4 |
| Morgan Stanley | 733.0k | 1.19% | $13.5M | added +4.2% | 2021 Q1 |
| Handelsbanken Fonder AB | 610.0k | 0.99% | $11.2M | trimmed -14.8% | 2025 Q2 |
| NEW York State Common Retirement Fund | 588.2k | 0.95% | $10.8M | added +22.6% | 2021 Q2 |
| Mirae Asset Global Etfs Holdings LTD. | 525.2k | 0.85% | $9.7M | added +1968.2% | 2024 Q3 |
| Charles Schwab Investment Management | 488.3k | 0.79% | $9.0M | unchanged | 2021 Q2 |
| Northern Trust | 485.9k | 0.79% | $8.9M | added +5% | 2021 Q2 |
| Arrowstreet Capital | 485.3k | 0.79% | $8.9M | opened | 2025 Q3 |
| Dimensional Fund Advisors | 483.9k | 0.78% | $8.9M | added +7.2% | 2023 Q4 |
| UBS | 322.2k | 0.52% | $5.9M | trimmed -18.4% | 2021 Q1 |
| Ameriprise Financial INC | 280.2k | 0.45% | $5.2M | added +32.2% | 2023 Q1 |
| Bastion Asset Management INC. | 274.1k | 0.44% | $5.0M | opened | 2025 Q3 |
| Susquehanna International Group | 256.4k | 0.41% | $4.7M | opened | 2021 Q1 |
| FMR (Fidelity) | 234.9k | 0.38% | $4.3M | added +17.3% | 2022 Q1 |
| AQR Capital | 231.4k | 0.37% | $4.3M | trimmed -7.7% | 2024 Q3 |
| Lord, Abbett & CO. LLC | 230.3k | 0.37% | $4.2M | trimmed -18.6% | 2025 Q3 |
| Citadel Advisors | 217.5k | 0.35% | $4.0M | trimmed -31.4% | 2021 Q1 |
| Bank OF America CORP /DE/ | 217.4k | 0.35% | $4.0M | added +114.6% | 2021 Q1 |
| Russell Investments Group, LTD. | 216.7k | 0.35% | $4.0M | trimmed -12% | 2022 Q1 |
| Silvercrest Asset Management Group LLC | 211.0k | 0.34% | $3.9M | added +25.6% | 2025 Q4 |
| CPP Investment Board | 209.7k | 0.34% | $3.9M | added +1.8% | 2025 Q2 |
| SEI Investments CO | 193.8k | 0.31% | $3.6M | added +87.8% | 2025 Q2 |
| AWM Investment Company, INC. | 186.0k | 0.30% | $3.4M | opened | 2026 Q1 |
| Essex Investment Management CO LLC | 184.6k | 0.30% | $3.4M | added +1.8% | 2024 Q1 |
| Janus Henderson | 177.9k | 0.29% | $3.3M | added +706% | 2025 Q3 |
| Walleye Capital LLC | 177.5k | 0.29% | $3.3M | added +17745500% | 2024 Q4 |
| Deutsche Bank AG\ | 171.7k | 0.28% | $3.2M | added +4% | 2024 Q2 |
| BNY Mellon | 154.4k | 0.25% | $2.8M | trimmed -1.1% | 2021 Q2 |
| Herald Investment Management LTD | 150.0k | 0.24% | $2.8M | trimmed -25% | 2025 Q1 |
| Nuveen | 132.7k | 0.21% | $2.4M | trimmed -54.1% | 2024 Q2 |
| First Trust Advisors LP | 132.7k | 0.21% | $2.4M | trimmed -46.6% | 2025 Q4 |
| Renaissance Technologies | 132.6k | 0.21% | $2.4M | opened | 2024 Q2 |
| Group ONE Trading LLC | 131.9k | 0.21% | $2.4M | added +190.6% | 2025 Q1 |
| SG Americas Securities, LLC | 127.6k | 0.21% | $2.3M | trimmed -53.9% | 2024 Q1 |
| Man Group | 120.0k | 0.19% | $2.2M | added +12.5% | 2025 Q2 |
| Hillsdale Investment Management INC. | 118.7k | 0.19% | $2.2M | added +6.4% | 2025 Q3 |
| Rhumbline Advisers | 118.4k | 0.19% | $2.2M | added +50.1% | 2024 Q2 |
| Franklin Resources | 116.8k | 0.19% | $2.1M | added +13.6% | 2025 Q3 |
| Swiss National Bank | 112.8k | 0.18% | $2.1M | added +4.2% | 2025 Q3 |
| BW Gestao de Investimentos Ltda. | 106.0k | 0.17% | $1.9M | opened | 2026 Q1 |
| Mariner, LLC | 104.0k | 0.17% | $1.9M | unchanged | 2024 Q3 |
| Panagora Asset Management INC | 101.9k | 0.17% | $1.9M | trimmed -17.8% | 2025 Q1 |
| Black Swift Group, LLC | 101.0k | 0.16% | $1.9M | opened | 2026 Q1 |
Largest 50 of 216 shown; the full ranked, searchable register is at boothcheck.com/holders/OUST. 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.