Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
385 institutional managers reported holding STM for the quarter ended Mar 31, 2026. Together they hold about 12% of shares outstanding; the top 10 hold 6%. 114 opened new positions; 44 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| VAN ECK Associates CORP | 11.66M | 1.26% | $402.7M | added +10.7% | 2018 Q3 |
| Citadel Advisors | 6.91M | 0.75% | $238.6M | added +361.9% | ≤2013 |
| Slate Path Capital LP (focused) | 6.13M | 0.66% | $211.6M | added +16% | 2025 Q4 |
| Morgan Stanley | 5.35M | 0.58% | $184.6M | trimmed -13.2% | ≤2013 |
| BlackRock | 4.93M | 0.53% | $170.3M | trimmed -40.4% | 2020 Q3 |
| Millennium Management | 4.47M | 0.48% | $154.4M | added +516.9% | 2020 Q1 |
| Goldman Sachs | 4.27M | 0.46% | $147.5M | trimmed -6.2% | ≤2013 |
| Invesco | 3.99M | 0.43% | $137.7M | trimmed -23.4% | 2023 Q4 |
| FIL LTD | 2.96M | 0.32% | $102.3M | trimmed -4.7% | 2025 Q2 |
| Dimensional Fund Advisors | 2.94M | 0.32% | $101.4M | trimmed -4.1% | ≤2013 |
| Two Sigma | 2.74M | 0.30% | $94.7M | trimmed -23.9% | 2021 Q1 |
| Duquesne Family Office | 2.61M | 0.28% | $90.2M | added +237.8% | 2025 Q4 |
| BNP Paribas Financial Markets | 2.45M | 0.27% | $84.7M | added +44.3% | 2019 Q1 |
| Analog Century Management LP (focused) | 2.33M | 0.25% | $80.6M | opened | 2020 Q4 |
| Hill City Capital, LP (focused) | 2.30M | 0.25% | $79.4M | opened | 2026 Q1 |
| Marshall Wace | 2.25M | 0.24% | $77.8M | added +36.7% | 2025 Q4 |
| UBS | 2.10M | 0.23% | $72.7M | added +52.3% | ≤2013 |
| Balyasny Asset Management | 2.08M | 0.23% | $71.8M | opened | 2026 Q1 |
| Penserra Capital Management LLC | 1.60M | 0.17% | $55.2M | added +5.3% | 2019 Q4 |
| Defiance ETFs, LLC | 1.60M | 0.17% | $55.2M | added +5.3% | 2025 Q4 |
| Barclays PLC | 1.52M | 0.17% | $52.6M | added +2.1% | ≤2013 |
| Citigroup INC | 1.43M | 0.15% | $49.5M | added +44.8% | ≤2013 |
| Rafferty Asset Management, LLC | 1.40M | 0.15% | $48.5M | trimmed -23.4% | 2021 Q3 |
| Jane Street | 1.20M | 0.13% | $41.4M | opened | 2016 Q3 |
| Brandes Investment Partners, LP | 1.10M | 0.12% | $38.0M | trimmed -29.9% | 2024 Q4 |
| Grantham, Mayo, Van Otterloo & CO. LLC | 962.0k | 0.10% | $33.2M | trimmed -5.7% | 2017 Q1 |
| Alyeska Investment Group | 956.4k | 0.10% | $33.0M | opened | 2026 Q1 |
| Bank OF America CORP /DE/ | 918.6k | 0.10% | $31.7M | trimmed -34.3% | ≤2013 |
| Nishkama Capital, LLC (focused) | 838.7k | 0.09% | $29.0M | opened | 2026 Q1 |
| FMR (Fidelity) | 825.2k | 0.09% | $28.5M | added +7% | 2017 Q1 |
| Susquehanna International Group | 679.3k | 0.07% | $23.5M | added +2275.7% | 2013 Q3 |
| Woodline Partners LP | 671.1k | 0.07% | $23.2M | trimmed -65% | 2024 Q2 |
| Mackenzie Financial CORP | 634.6k | 0.07% | $21.9M | added +13.6% | 2024 Q3 |
| Northern Trust | 614.9k | 0.07% | $21.2M | added +10.7% | ≤2013 |
| Voloridge Investment Management | 609.7k | 0.07% | $21.1M | trimmed -38.1% | 2024 Q3 |
| Talos Eurisko Asset Management LP (focused) | 592.3k | 0.06% | $20.5M | opened | 2026 Q1 |
| Manufacturers Life Insurance Company, THE | 553.7k | 0.06% | $19.1M | opened | 2026 Q1 |
| Healthcare OF Ontario Pension Plan Trust Fund | 550.8k | 0.06% | $19.0M | trimmed -8.2% | 2025 Q2 |
| Hardman Johnston Global Advisors LLC | 542.0k | 0.06% | $18.7M | added +45.5% | 2025 Q3 |
| Robeco Institutional Asset Management B.v. | 528.4k | 0.06% | $18.3M | trimmed -6.7% | 2023 Q2 |
| Strategic Wealth Partners, LTD. | 477.1k | 0.05% | $16.5M | added +73.1% | 2025 Q4 |
| Walleye Capital LLC | 431.6k | 0.05% | $14.9M | added +86.5% | 2023 Q4 |
| Tidal Investments LLC | 417.1k | 0.04% | $14.4M | added +3741% | 2023 Q3 |
| ExodusPoint | 392.2k | 0.04% | $13.5M | added +680.7% | 2025 Q2 |
| Point72 | 384.6k | 0.04% | $13.3M | opened | 2024 Q3 |
| Beaconlight Capital, LLC (focused) | 384.5k | 0.04% | $13.3M | opened | 2025 Q3 |
| Wells Fargo & COMPANY/MN | 366.8k | 0.04% | $12.7M | trimmed -12.1% | ≤2013 |
| Mmcap International INC. SPC | 309.9k | 0.03% | $10.7M | opened | 2026 Q1 |
| American Century Companies INC | 299.2k | 0.03% | $10.3M | trimmed -15.1% | 2019 Q4 |
| Foresight Global Investors, INC. (focused) | 296.9k | 0.03% | $10.3M | trimmed -38.5% | 2025 Q1 |
Largest 50 of 385 shown; the full ranked, searchable register is at boothcheck.com/holders/STM. 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.