Cyclerion Therapeutics, Inc. - CYCN
Detailed investor-level table based on 13F positions.
Early Q1 2026 data: only 2 institutional holders reported so far. The full shareholder list will grow as more funds file with the SEC.
Methodology:
Market value and % of portfolio use SEC reported VALUE ($000).
For PUT/CALL positions this reflects reported underlying exposure, not premium cash paid/received.
Details.
Rows: 0
| Investor | History | Status | Shares held | Market value ($000) | % of portfolio | Previous % | Rank | Change in shares | % change in shares | Source | Date reported |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Siren, L.L.C. | History | Reduced | 115,603 | 146 | 0.0% | 0.01% | 1 | -552 | -0.48% | Q4 2025 | Feb 13, 2026 |
| GEODE CAPITAL MANAGEMENT, LLC | History | Added to | 43,302 | 55 | 0.0% | 0.0% | 2 | +6,144 | 16.53% | Q4 2025 | Feb 09, 2026 |
| TWO SIGMA INVESTMENTS, LP | History | Added to | 41,555 | 52 | 0.0% | 0.0% | 3 | +28,262 | 212.61% | Q4 2025 | Feb 17, 2026 |
| TWO SIGMA ADVISERS, LP | History | New | 28,300 | 35 | 0.0% | — | 4 | +28,300 | New | Q4 2025 | Feb 17, 2026 |
| VANGUARD GROUP INC | History | No change | 23,490 | 29 | 0.0% | 0.0% | 5 | 0 | 0.0% | Q4 2025 | Jan 29, 2026 |
| BlackRock, Inc. | History | No change | 16,797 | 21 | 0.0% | 0.0% | 6 | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| XTX Topco Ltd | History | New | 10,027 | 12 | 0.0% | — | 7 | +10,027 | New | Q4 2025 | Feb 17, 2026 |
| CITIGROUP INC | History | New | 8,204 | 10 | 0.0% | — | 8 | +8,204 | New | Q4 2025 | Feb 13, 2026 |
| FMR LLC | History | Reduced | 4,740 | 6 | 0.0% | 0.0% | 9 | -6 | -0.13% | Q4 2025 | Feb 17, 2026 |
| Tower Research Capital LLC (TRC) | History | Added to | 3,154 | 4 | 0.0% | 0.0% | 10 | +826 | 35.48% | Q4 2025 | Feb 17, 2026 |
| DRW Securities, LLC | History | Closed out | 0 | 0 | — | 0.0% | — | -43,617 | -100.0% | Q3 2025 | Nov 14, 2025 |
| MORGAN STANLEY | History | Reduced | 1 | 0 | — | 0.0% | — | -648 | -99.85% | Q4 2025 | Feb 13, 2026 |
| UBS Group AG | History | Added to | 376 | 0 | — | — | — | +327 | 667.35% | Q4 2025 | Jan 29, 2026 |
| BANK OF AMERICA CORP /DE/ | History | Added to | 107 | 0 | — | — | — | +85 | 386.36% | Q4 2025 | Feb 17, 2026 |
| WHI TRUST Co LLC | History | New | 72 | 0 | — | — | — | +72 | New | Q4 2025 | Feb 05, 2026 |
| BARCLAYS PLC | History | Closed out | 0 | 0 | — | — | — | -5 | -100.0% | Q3 2025 | Mar 31, 2026 |
| GROUP ONE TRADING LLC | History | No change | 192 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 12, 2026 |
| MAI Capital Management | History | No change | 100 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 13, 2026 |
| BNP PARIBAS FINANCIAL MARKETS | History | No change | 5 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 10, 2026 |
| OSAIC HOLDINGS, INC. | History | No change | 130 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Feb 17, 2026 |
| Activest Wealth Management | History | No change | 100 | 0 | — | — | — | 0 | 0.0% | Q4 2025 | Jan 30, 2026 |