Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
197 institutional managers reported holding PSO for the quarter ended Mar 31, 2026. Together they hold about 4% of shares outstanding; the top 10 hold 3%. 33 opened new positions; 28 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Morgan Stanley | 4.00M | 0.61% | $52.5M | added +0.7% | ≤2013 |
| BlackRock | 2.68M | 0.41% | $35.3M | added +8.2% | 2020 Q4 |
| Goldman Sachs | 2.41M | 0.37% | $31.7M | added +7.2% | ≤2013 |
| Arrowstreet Capital | 1.65M | 0.25% | $21.6M | added +72.5% | 2023 Q4 |
| LMR Partners LLP | 1.37M | 0.21% | $18.0M | added +70.4% | 2025 Q4 |
| Invesco | 1.08M | 0.17% | $14.2M | trimmed -3.5% | 2024 Q1 |
| Dimensional Fund Advisors | 1.01M | 0.15% | $13.3M | unchanged | ≤2013 |
| D. E. Shaw | 828.9k | 0.13% | $10.9M | added +164.3% | 2025 Q3 |
| Northern Trust | 794.5k | 0.12% | $10.4M | added +7.5% | ≤2013 |
| Optiver | 614.9k | 0.09% | $8.1M | trimmed -21.9% | 2025 Q3 |
| AllianceBernstein | 544.1k | 0.08% | $7.2M | unchanged | 2025 Q2 |
| BNP Paribas Financial Markets | 527.3k | 0.08% | $6.9M | added +0.6% | 2024 Q4 |
| Quantinno Capital Management LP | 512.9k | 0.08% | $6.7M | added +16.8% | 2022 Q4 |
| Jane Street | 484.3k | 0.07% | $6.4M | added +185.4% | 2022 Q2 |
| Pacer Advisors, INC. | 468.6k | 0.07% | $6.2M | added +17.7% | 2025 Q3 |
| 13D Management LLC (focused) | 458.3k | 0.07% | $6.0M | unchanged | 2020 Q2 |
| FMR (Fidelity) | 434.2k | 0.07% | $5.7M | added +18% | 2018 Q3 |
| Renaissance Group LLC | 369.7k | 0.06% | $4.9M | trimmed -1.6% | 2024 Q3 |
| Connor, Clark & Lunn Investment Management LTD. | 342.3k | 0.05% | $4.5M | opened | 2026 Q1 |
| Point72 | 309.1k | 0.05% | $4.1M | added +22.1% | 2024 Q1 |
| Creative Planning | 265.6k | 0.04% | $3.5M | added +41% | 2022 Q3 |
| ABC Arbitrage SA | 225.0k | 0.04% | $3.0M | trimmed -37.1% | 2025 Q3 |
| QRG Capital Management, INC. | 177.8k | 0.03% | $2.3M | added +13.4% | 2023 Q3 |
| Charles Schwab Investment Management | 174.9k | 0.03% | $2.3M | trimmed -10.9% | 2023 Q2 |
| Bank OF Montreal /CAN/ | 173.2k | 0.03% | $2.3M | trimmed -21.5% | 2024 Q2 |
| Aquatic Capital Management LLC | 160.7k | 0.03% | $2.1M | added +491.3% | 2021 Q4 |
| Tower Research Capital LLC (TRC) | 153.4k | 0.02% | $2.0M | trimmed -1.6% | 2022 Q2 |
| HRT Financial LP | 148.7k | 0.02% | $2.0M | opened | 2024 Q2 |
| Mariner, LLC | 142.3k | 0.02% | $1.9M | trimmed -2.5% | 2022 Q1 |
| Campbell & CO Investment Adviser LLC | 142.1k | 0.02% | $1.9M | added +110% | 2025 Q2 |
| Ethic INC. | 140.9k | 0.02% | $1.9M | added +3.5% | 2021 Q4 |
| Schonfeld Strategic Advisors | 140.2k | 0.02% | $1.8M | trimmed -55.2% | 2025 Q3 |
| Crossmark Global Holdings, INC. | 139.3k | 0.02% | $1.8M | trimmed -1.2% | 2017 Q3 |
| Cerity Partners LLC | 136.7k | 0.02% | $1.8M | trimmed -4.3% | 2022 Q2 |
| Pathstone Holdings, LLC | 128.6k | 0.02% | $1.7M | added +2.1% | 2023 Q4 |
| AQR Capital | 119.3k | 0.02% | $1.6M | added +3.6% | 2024 Q1 |
| Geode Capital | 115.2k | 0.02% | $1.5M | trimmed -28% | 2013 Q4 |
| Vanguard Group | 112.6k | 0.02% | $1.5M | added +0.8% | 2020 Q3 |
| UBS | 95.5k | 0.01% | $1.3M | added +14.2% | ≤2013 |
| Natixis Advisors, LLC | 86.4k | 0.01% | $1.1M | added +9% | 2021 Q4 |
| Laird Norton Wetherby Trust Company, LLC | 83.8k | 0.01% | $1.1M | added +8.3% | 2017 Q2 |
| American Century Companies INC | 77.5k | 0.01% | $1.0M | unchanged | 2021 Q2 |
| Engineers Gate Manager LP | 73.9k | 0.01% | $971k | added +141.2% | 2025 Q2 |
| Bank OF America CORP /DE/ | 71.3k | 0.01% | $937k | trimmed -50.9% | ≤2013 |
| Abacus Wealth Partners, LLC | 69.3k | 0.01% | $911k | trimmed -5.9% | 2025 Q4 |
| Citadel Advisors | 63.0k | 0.01% | $828k | added +84.6% | 2025 Q1 |
| Millennium Management | 62.4k | 0.01% | $820k | trimmed -36.8% | 2022 Q4 |
| Mercer Global Advisors INC /ADV | 62.3k | 0.01% | $819k | added +37.9% | 2023 Q3 |
| Barclays PLC | 62.3k | 0.01% | $819k | unchanged | 2025 Q4 |
| Brooklyn Investment Group | 60.3k | <0.01% | $793k | trimmed -9% | 2024 Q4 |
Largest 50 of 197 shown; the full ranked, searchable register is at boothcheck.com/holders/PSO. 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.