# CYCLERION THERAPEUTICS INC COM

CYCLERION THERAPEUTICS INC COM is a security (CUSIP 23255M204) tracked across SEC portfolio filings. 14 institutional managers reported $258K on Form 13F as of 2026-06-30; 4 registered fund positions totaling $784K via N-PORT as of 2026-05-31.

## Summary

- Issuer: CYCLERION THERAPEUTICS INC
- Class: COM
- CUSIP: 23255M204
- Asset category: EC
- 13F holders: 14
- 13F value: $258K
- 13F period: 2026-06-30
- N-PORT fund positions: 4
- N-PORT value: $784K
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $130K | 84,550 |
| BlackRock, Inc. | New York, NY | $57K | 16,797 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $30K | 23,490 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $28K | 18,261 |
| FMR LLC | BOSTON, MA | $7K | 4,740 |
| UBS Group AG | Zurich, V8 | $5K | 3,391 |
| [Activest Wealth Management](https://search.stillhousedata.com/firm/156150) | AVENTURA, FL | $339 | 100 |
| [GROUP ONE TRADING, L.P.](https://search.stillhousedata.com/firm/37484) | CHICAGO, IL | $295 | 192 |
| OSAIC HOLDINGS, INC. | PHOENIX, AZ | $201 | 130 |
| MAI Capital Management | INDEPENDENCE, OH | $155 | 100 |
| WHI TRUST Co LLC | CHICAGO, IL | $112 | 72 |
| BNP PARIBAS ARBITRAGE, SNC | PARIS, I0 | $8 | 5 |
| MORGAN STANLEY | NEW YORK, NY | $2 | 1 |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | BIRMINGHAM, AL | — | 0 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [Fidelity Growth Company Fund](https://search.stillhousedata.com/fund/S000007119) | Fidelity Mt. Vernon Street Trust | $688K | 0.07% |
| [Fidelity Nasdaq Composite Index ETF](https://search.stillhousedata.com/fund/S000006011) | Fidelity Commonwealth Trust | $67K | 0.06% |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $25K | 0.00% |
| [Fidelity Advisor Health Care Fund](https://search.stillhousedata.com/fund/S000005329) | Fidelity Advisor Series VII | $5K | 0.02% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/23255M204.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.