Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
225 institutional managers reported holding REX for the quarter ended Mar 31, 2026. Together they hold about 80% of shares outstanding; the top 10 hold 52%. 38 opened new positions; 16 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 5.49M | 16.65% | $250.3M | unchanged | ≤2013 |
| Vanguard Group | 2.71M | 8.20% | $123.3M | added +6.9% | ≤2013 |
| Dimensional Fund Advisors | 1.90M | 5.75% | $86.4M | trimmed -3.5% | ≤2013 |
| Renaissance Technologies | 1.52M | 4.62% | $69.4M | trimmed -4.5% | ≤2013 |
| State Street | 1.45M | 4.40% | $66.2M | added +8.2% | ≤2013 |
| Systematic Financial Management LP | 1.11M | 3.36% | $50.5M | trimmed -6.6% | 2013 Q3 |
| Mangrove Partners IM, LLC | 1.02M | 3.08% | $46.3M | unchanged | 2025 Q3 |
| Geode Capital | 835.5k | 2.53% | $38.1M | added +20.1% | ≤2013 |
| D. E. Shaw | 643.9k | 1.95% | $29.3M | added +2.8% | 2023 Q4 |
| American Century Companies INC | 596.6k | 1.81% | $27.2M | trimmed -15.3% | 2022 Q2 |
| Morgan Stanley | 550.6k | 1.67% | $25.1M | trimmed -4.6% | ≤2013 |
| Invesco | 528.9k | 1.60% | $24.1M | trimmed -1.8% | ≤2013 |
| Brown Advisory INC | 512.1k | 1.55% | $23.3M | trimmed -44.7% | 2017 Q4 |
| Arrowstreet Capital | 447.6k | 1.36% | $20.4M | added +6.4% | 2023 Q4 |
| Northern Trust | 447.2k | 1.35% | $20.4M | added +17.6% | ≤2013 |
| Charles Schwab Investment Management | 446.2k | 1.35% | $20.3M | trimmed -5.8% | ≤2013 |
| Bridgeway Capital Management, LLC | 316.8k | 0.96% | $14.4M | trimmed -8.2% | ≤2013 |
| Hotchkis & Wiley Capital Management LLC | 301.1k | 0.91% | $13.7M | trimmed -28.4% | 2017 Q4 |
| Nuveen | 254.3k | 0.77% | $11.6M | trimmed -6.1% | 2019 Q2 |
| Goldman Sachs | 240.2k | 0.73% | $10.9M | trimmed -6.4% | ≤2013 |
| UniSuper Management Pty LTD | 202.7k | 0.61% | $9.2M | unchanged | 2025 Q4 |
| BNY Mellon | 192.0k | 0.58% | $8.8M | trimmed -3.6% | ≤2013 |
| Qube Research & Technologies LTD | 179.1k | 0.54% | $8.2M | trimmed -15.8% | 2022 Q4 |
| AQR Capital | 173.4k | 0.53% | $7.9M | added +20.4% | 2021 Q1 |
| Empowered Funds, LLC | 164.2k | 0.50% | $7.5M | added +5% | 2023 Q2 |
| Principal Financial Group INC | 163.4k | 0.49% | $7.4M | added +0.8% | 2015 Q3 |
| AWH Capital, L.p. (focused) | 147.5k | 0.45% | $6.7M | unchanged | 2025 Q2 |
| UBS | 146.0k | 0.44% | $6.7M | added +23.5% | ≤2013 |
| Panagora Asset Management INC | 129.8k | 0.39% | $5.9M | trimmed -14.8% | 2019 Q4 |
| Citadel Advisors | 121.9k | 0.37% | $5.6M | added +59.9% | 2022 Q3 |
| South Dakota Investment Council | 121.7k | 0.37% | $5.5M | unchanged | 2020 Q1 |
| Jane Street | 119.1k | 0.36% | $5.4M | added +233% | 2022 Q4 |
| Public Sector Pension Investment Board | 101.4k | 0.31% | $4.6M | added +3.3% | 2015 Q3 |
| Bessemer Group INC | 95.2k | 0.29% | $4.3M | unchanged | 2025 Q1 |
| Bank OF America CORP /DE/ | 88.8k | 0.27% | $4.0M | added +8.7% | ≤2013 |
| Rhumbline Advisers | 85.8k | 0.26% | $3.9M | added +1.8% | ≤2013 |
| Ameriprise Financial INC | 84.6k | 0.26% | $3.9M | trimmed -21.5% | ≤2013 |
| Teacher Retirement System OF Texas | 77.4k | 0.23% | $3.5M | added +47.3% | 2023 Q4 |
| Walnut Level Capital LLC (focused) | 71.2k | 0.22% | $3.2M | unchanged | 2023 Q4 |
| Legal & General Group PLC | 65.2k | 0.20% | $3.0M | trimmed -1.9% | 2014 Q3 |
| Swiss National Bank | 58.7k | 0.18% | $2.7M | unchanged | 2014 Q2 |
| SEI Investments CO | 57.1k | 0.17% | $2.6M | added +27.7% | 2019 Q1 |
| HRT Financial LP | 54.1k | 0.16% | $2.5M | trimmed -5.9% | 2024 Q4 |
| ExodusPoint | 54.1k | 0.16% | $2.5M | added +433.5% | 2025 Q2 |
| Point72 | 50.3k | 0.15% | $2.3M | added +3.9% | 2025 Q4 |
| Janus Henderson | 49.8k | 0.15% | $2.3M | unchanged | 2023 Q1 |
| Millennium Management | 46.9k | 0.14% | $2.1M | trimmed -21.2% | 2022 Q4 |
| Winton Group | 46.0k | 0.14% | $2.1M | added +6.9% | 2023 Q2 |
| Hennion & Walsh Asset Management, INC. | 46.0k | 0.14% | $2.1M | added +56.8% | 2025 Q3 |
| Barclays PLC | 44.9k | 0.14% | $2.0M | trimmed -46.3% | ≤2013 |
Largest 50 of 225 shown; the full ranked, searchable register is at boothcheck.com/holders/REX. 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.