22 institutions reported holding $249,026 of CYCLERION THERAPEUTICS INC (CYCN) in SEC 13F filings for 2026-03-31. Largest institutional holders: GEODE CAPITAL MANAGEMENT, LLC ($129,800), CITADEL ADVISORS LLC ($28,031), BlackRock, Inc. ($26,035), VANGUARD CAPITAL MANAGEMENT LLC ($24,770), Kovack Advisors, Inc. ($15,500). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GEODE CAPITAL MANAGEMENT, LLC | $129,800 | 84,550 | Added |
| 2 | CITADEL ADVISORS LLC | $28,031 | 18,261 | New |
| 3 | BlackRock, Inc. | $26,035 | 16,797 | Hold |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $24,770 | 16,137 | New |
| 5 | Kovack Advisors, Inc. | $15,500 | 10,000 | New |
| 6 | VANGUARD FIDUCIARY TRUST CO | $11,287 | 7,353 | New |
| 7 | FMR LLC | $7,276 | 4,740 | Hold |
| 8 | UBS Group AG | $5,256 | 3,391 | Added |
| 9 | GROUP ONE TRADING LLC | $295 | 192 | Hold |
| 10 | OSAIC HOLDINGS, INC. | $201 | 130 | Hold |
| 11 | Activest Wealth Management | $155 | 100 | Hold |
| 12 | MAI Capital Management | $155 | 100 | Hold |
| 13 | CITIGROUP INC | $137 | 89 | Trimmed |
| 14 | WHI TRUST Co LLC | $112 | 72 | Hold |
| 15 | BNP PARIBAS FINANCIAL MARKETS | $8 | 5 | Hold |
| 16 | Caitong International Asset Management Co., Ltd | $6 | 4 | New |
| 17 | MORGAN STANLEY | $2 | 1 | Hold |
| 18 | TWO SIGMA INVESTMENTS, LP | $0 | 0 | Exited |
| 19 | BANK OF AMERICA CORP /DE/ | $0 | 0 | Exited |
| 20 | XTX Topco Ltd | $0 | 0 | Exited |
| 21 | Tower Research Capital LLC (TRC) | $0 | 0 | Exited |
| 22 | Siren, L.L.C. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31