Cyclerion Therapeutics, Inc. (CYCN) ownership: Top institutional holder: Siren, L.L.C. ($146816.00). Insider activity: Net Seller (0 buys, 20 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| Siren, L.L.C. | 115603.00 | $146816.00 | 2025-12-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 84550.00 | $129800.00 | 2026-03-31 |
| TWO SIGMA INVESTMENTS, LP | 41555.00 | $52775.00 | 2025-12-31 |
| TWO SIGMA ADVISERS, LP | 28300.00 | $35941.00 | 2025-12-31 |
| RENAISSANCE TECHNOLOGIES LLC | 10611.00 | $34167.00 | 2024-12-31 |
| VANGUARD GROUP INC | 23490.00 | $29832.00 | 2025-12-31 |
| CITADEL ADVISORS LLC | 18261.00 | $28031.00 | 2026-03-31 |
| BlackRock, Inc. | 16797.00 | $26035.00 | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-08-14 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2026-07-16 | |
| Sell | null | 2025-08-07 |
Back to CYCN overview · CYCN earnings · All congressional trades
Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.