13F

Stock

Cyclerion Therapeutics, Inc.

CYCN · held by 19 managers

Reported value

$376.3K

Holders

19

+0 new · −1 exited

Holders’ est. mark

−$22

Price effect on 2 books still in the name

Largest holder

$146.8K

Siren, L.L.C.

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
Siren, L.L.C.115.6K$146.8KHeld
GEODE CAPITAL MANAGEMENT, LLC43.3K$55KHeld
TWO SIGMA INVESTMENTS, LP41.6K$52.8KHeld
TWO SIGMA ADVISERS, LP28.3K$35.9KHeld
Vanguard23.5K$29.8KHeld
BlackRock, Inc.16.8K$21.3KHeld
XTX Topco Ltd10K$12.7KHeld
CITIGROUP INC8.2K$10.4KHeld
Fidelity4.74K$6.02KHeld
Tower Research Capital LLC (TRC)3.15K$4.01KHeld
UBS Group AG376$478Held
GROUP ONE TRADING LLC192$244Held
OSAIC HOLDINGS, INC.130$165Held
BANK OF AMERICA CORP /DE/107$136−$22Added$86
Activest Wealth Management100$127Held
MAI Capital Management100$127Held
WHI TRUST Co LLC72$91Held
BNP PARIBAS FINANCIAL MARKETS5$6Held
MORGAN STANLEY1$2−$0Cut−$1.49K

Who left

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.