CYCN - Company ID 0001755237
Cyclerion Therapeutics, Inc. has filed 344 public company documents between 2018 and 2026. The most frequent type is insider trade (88 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Type | Filing | Filed | Period covered | Open |
|---|---|---|---|---|
| 10-Q | Quarterly report | 2mo ago2026-05-12 | 2026-03-31 | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 2mo ago2026-05-07 | - | View filing |
| 10-K/A | Annual report (amended) | 2mo ago2026-04-30 | 2025-12-31 | View filing |
| S-4 | S-4 | 2mo ago2026-04-20 | - | View filing |
| 425 | 425 | 3mo ago2026-04-01 | - | View filing |
| 8-K | Major company event | 3mo ago2026-04-01 | 2026-04-01 | View filing |
| 10-K | Annual report | 3mo ago2026-03-30 | 2025-12-31 | View filing |
| 8-K | Major company event | 4mo ago2026-02-17 | 2026-02-17 | View filing |
| 8-K | Major company event | 6mo ago2026-01-06 | 2026-01-03 | View filing |
| 8-K | Major company event | 7mo ago2025-12-01 | 2025-12-01 | View filing |
| 10-Q | Quarterly report | 8mo ago2025-11-12 | 2025-09-30 | View filing |
| 10-K/A | Annual report (amended) | 8mo ago2025-11-12 | 2024-12-31 | View filing |
| SCHEDULE 13G | SCHEDULE 13G | 8mo ago2025-10-17 | - | View filing |
| 8-K | Major company event | 9mo ago2025-09-23 | 2025-09-19 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 11mo ago2025-08-14 | - | View filing |
| 4 | Insider trade | 11mo ago2025-08-11 | 2025-08-07 | View filing |
| 10-Q | Quarterly report | 11mo ago2025-08-05 | 2025-06-30 | View filing |
| 8-K | Major company event | 1y ago2025-06-18 | 2025-06-16 | View filing |
| EFFECT | EFFECT | 1y ago2025-05-15 | - | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2025-05-15 | - | View filing |
| CORRESP | Company correspondence | 1y ago2025-05-13 | - | View filing |
| UPLOAD | SEC correspondence | 1y ago2025-05-12 | - | View filing |
| 8-K | Major company event | 1y ago2025-05-07 | 2025-05-07 | View filing |
| 424B5 | Prospectus supplement | 1y ago2025-05-07 | - | View filing |
| S-3 | Securities registration | 1y ago2025-05-06 | - | View filing |
| 10-Q | Quarterly report | 1y ago2025-05-06 | 2025-03-31 | View filing |
| DEFA14A | Proxy materials | 1y ago2025-04-29 | - | View filing |
| DEF 14A | Proxy statement | 1y ago2025-04-29 | 2025-06-16 | View filing |
| SCHEDULE 13D/A | SCHEDULE 13D/A | 1y ago2025-03-28 | - | View filing |
| 4 | Insider trade | 1y ago2025-03-27 | 2025-03-25 | View filing |
| 4 | Insider trade | 1y ago2025-03-27 | 2025-03-25 | View filing |
| 8-K | Major company event | 1y ago2025-03-25 | 2025-03-21 | View filing |
| 10-K | Annual report | 1y ago2025-03-04 | 2024-12-31 | View filing |
| EFFECT | EFFECT | 1y ago2025-02-12 | - | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2025-02-12 | - | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2025-02-12 | - | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2025-02-12 | - | View filing |
| CORRESP | Company correspondence | 1y ago2025-02-10 | - | View filing |
| UPLOAD | SEC correspondence | 1y ago2025-02-07 | - | View filing |
| S-3 | Securities registration | 1y ago2025-02-04 | - | View filing |
| 8-K | Major company event | 1y ago2024-12-17 | 2024-12-13 | View filing |
| SCHEDULE 13G/A | SCHEDULE 13G/A | 1y ago2024-12-06 | - | View filing |
| 4 | Insider trade | 1y ago2024-11-25 | 2024-11-21 | View filing |
| 10-Q | Quarterly report | 1y ago2024-11-14 | 2024-09-30 | View filing |
| 8-K | Major company event | 1y ago2024-08-07 | 2024-08-07 | View filing |
| 4 | Insider trade | 1y ago2024-08-07 | 2024-08-05 | View filing |
| 10-Q | Quarterly report | 1y ago2024-08-07 | 2024-06-30 | View filing |
| SC 13G/A | Passive ownership stake (update) | 2y ago2024-07-12 | - | View filing |
| 8-K | Major company event | 2y ago2024-06-14 | 2024-06-14 | View filing |
| 10-Q | Quarterly report | 2y ago2024-05-07 | 2024-03-31 | View filing |