Cyclerion Therapeutics, Inc. - Common Stock, no par value (CYCN)
CUSIP: 23255M204
Q4 2025 13F Holders as of 31 Dec 2025
- Type / Class
- Equity / Common Stock, no par value
- Shares outstanding
- 3,367,000
- Total 13F shares
- 296,254
- Share change
- +37,995
- Total reported value
- $376,255
- Price per share
- $1.27
- Number of holders
- 18
- Value change
- +$3,325
- Number of buys
- 8
- Number of sells
- 4
Quarterly Holders Quick Answers
What is CUSIP 23255M204?
CUSIP 23255M204 identifies CYCN - Cyclerion Therapeutics, Inc. - Common Stock, no par value in SEC institutional holdings data.
Need full ownership history?
Open the full security ownership history page.
Next holder-history checks
These links keep the next click tied to holder verification, nearby quarters, or outside-13F ownership context.
- Back to full security ownership history for the broader multi-quarter picture.
- Latest 13F filings for newly reported positions across managers.
- Latest Schedule 13D/13G reports for ownership changes outside the 13F cadence.
- SEC investors directory for manager drilldown.
Explore More Reporting Periods
Jump to adjacent filing periods for faster comparison and easier crawl discovery.
Recent filing periods for CUSIP 23255M204:
Top shareholders of CYCN - Cyclerion Therapeutics, Inc. - Common Stock, no par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Peter M. Hecht |
13D/G
3/4/5
|
Director, 10%+ Owner |
28%
|
1,028,086
|
$3,803,918 | $0 | 25 Mar 2025 | |
| J. WOOD CAPITAL ADVISORS LLC |
13D/G
|
— |
5.4%
|
181,818
|
$496,363 | $0 | 25 Mar 2025 | |
| American Endowment Foundation |
13D/G
|
— |
4.9%
|
133,026
|
$492,196 | $0 | 31 Dec 2024 | |
| TYNDALL CAPITAL PARTNERS L P |
13D/G
|
— |
4.8%
|
155,187
|
$487,287 | -$30,113 | 30 Jun 2025 | |
| Regina M. Graul |
3/4/5
|
President and Chief Executive Officer, Director |
—
mixed-class rows
|
156,152
mixed-class rows
|
$340,529 | — | 05 Aug 2024 | |
| Siren, L.L.C. |
13F
|
Individual |
3.4%
|
116,155
|
$267,157 | — | 30 Sep 2025 | |
| Terrance McGuire |
3/4/5
|
Director |
—
class O/S missing
|
42,010
|
$142,624 | — | 30 Nov 2023 | |
| Errol B. Desouza |
3/4/5
|
Director |
—
class O/S missing
|
30,000
|
$101,850 | — | 30 Nov 2023 | |
| DRW Securities, LLC |
13F
|
Company |
1.3%
|
43,617
|
$100,319 | — | 30 Sep 2025 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
1.1%
|
37,158
|
$85,487 | — | 30 Sep 2025 | |
| Michael J. Higgins |
3/4/5
|
Director |
—
class O/S missing
|
30,740
|
$84,535 | — | 25 Mar 2025 | |
| Dina Katabi |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
$67,900 | — | 30 Nov 2023 | |
| Steven Hyman |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
$67,900 | — | 30 Nov 2023 | |
| VANGUARD GROUP INC |
13F
|
Company |
0.7%
|
23,490
|
$54,027 | — | 30 Sep 2025 | |
| BlackRock, Inc. |
13F
|
Company |
0.5%
|
16,797
|
$38,633 | — | 30 Sep 2025 | |
| TWO SIGMA INVESTMENTS, LP |
13F
|
Company |
0.39%
|
13,293
|
$30,574 | — | 30 Sep 2025 | |
| FMR LLC |
13D/G
13F
|
Company |
0.2%
|
4,740
|
$17,538 | $0 | 31 Dec 2024 | |
| Tower Research Capital LLC (TRC) |
13F
|
Company |
0.07%
|
2,328
|
$5,354 | — | 30 Sep 2025 | |
| MORGAN STANLEY |
13F
|
Company |
0.02%
|
649
|
$1,493 | — | 30 Sep 2025 | |
| GROUP ONE TRADING LLC |
13F
|
Company |
0.01%
|
192
|
$442 | — | 30 Sep 2025 | |
| OSAIC HOLDINGS, INC. |
13F
|
Company |
0%
|
130
|
$304 | — | 30 Sep 2025 | |
| Activest Wealth Management |
13F
|
Company |
0%
|
100
|
$230 | — | 30 Sep 2025 | |
| MAI Capital Management |
13F
|
Company |
0%
|
100
|
$230 | — | 30 Sep 2025 | |
| UBS Group AG |
13F
|
Company |
0%
|
49
|
$113 | — | 30 Sep 2025 | |
| BANK OF AMERICA CORP /DE/ |
13F
|
Company |
0%
|
22
|
$50 | — | 30 Sep 2025 | |
| BARCLAYS PLC |
13F
|
Company |
0%
|
5
|
$12 | — | 30 Sep 2025 | |
| BNP PARIBAS FINANCIAL MARKETS |
13F
|
Company |
0%
|
5
|
$12 | — | 30 Sep 2025 | |
| Andreas Busch |
3/4/5
|
Chief Scientific Officer |
—
class O/S missing
|
135,000
|
— | — | 20 Jan 2022 | |
| Anjeza Gjino |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
135,000
|
— | — | 20 Jan 2022 | |
| Cheryl Gault |
3/4/5
|
Chief Operating Officer |
—
class O/S missing
|
135,000
|
— | — | 20 Jan 2022 | |
| Rhonda M. Chicko |
3/4/5
|
Chief Financial Officer |
—
class O/S missing
|
25,000
|
— | — | 07 Aug 2025 | |
| George H. Conrades |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
— | — | 14 Jun 2022 | |
| Marsha Fanucci |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
— | — | 14 Jun 2022 | |
| Michael Mendelsohn |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
— | — | 14 Jun 2022 | |
| Ole Isacson |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
— | — | 14 Jun 2022 | |
| Stephanie Lovell |
3/4/5
|
Director |
—
class O/S missing
|
20,000
|
— | — | 14 Jun 2022 | |
| Kevin Churchwell |
3/4/5
|
Director |
—
class O/S missing
|
10,000
|
— | — | 24 Jun 2021 |
Institutional Holders of Cyclerion Therapeutics, Inc. - Common Stock, no par value (CYCN) as of Q4 2025
As of 31 Dec 2025,
Cyclerion Therapeutics, Inc. - Common Stock, no par value (CYCN) was held by
18 institutional
shareholders
that filed Form 13F with the SEC.
Together, they reported ownership of
296,254 shares.
The largest 10 holders included
Siren, L.L.C., GEODE CAPITAL MANAGEMENT, LLC, TWO SIGMA INVESTMENTS, LP, TWO SIGMA ADVISERS, LP, VANGUARD GROUP INC, BlackRock, Inc., XTX Topco Ltd, CITIGROUP INC, FMR LLC, and Tower Research Capital LLC (TRC).
This page lists
18
institutional shareholders reporting positions in this security
for the Q4 2025 filing period.
| Investor | Option | Weight % | Change % | Value $ | * Price | Shares | Share Change | Activity | Report Period |
|---|
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
17
Q4 2025 holders
18
Holder diff
1
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 Value $ | Q4 2025 Value $ | Value Diff $ | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.
An asterisk sign (*) next to the price indicates that the price is likely invalid.