Comparable stake leader
Peter M. Hecht
SEC ownership of Cyclerion Therapeutics, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001755237.
Disclosed value leader
Kalehua Capital Management LLC
Comparable rows
25/41
Latest evidence
14 Aug 2026
- Public ticker
- CYCN on Nasdaq
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Peter M. Hecht
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
25 of 41
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Peter M. Hecht
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
14 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001755237
- Issuer location
- Cambridge, MA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Cyclerion Therapeutics, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Peter M. Hecht
Disclosed value leader
Kalehua Capital Managemen...
Comparable rows
25/41
Latest evidence
14 Aug 2026
3/4/5
13D/G
13F
Lead comparable stake: 19%
16 rows are not safely comparable across share classes.
13D/G row: Peter M. Hecht
Showing 1-8 of 41 holder rows.
Quick read
Peter M. Hecht leads the comparable SEC ownership view at 19%.
25 of 41 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Peter M. Hecht's linked filing trail.
Comparable ownership
Top 5
Peter M. Hecht
19%
FMR LLC
15%
BALYASNY ASSET MANAGEMENT L.P.
7.3%
ADAR1 Capital Management, LLC
7%
J. WOOD CAPITAL ADVISORS LLC
5.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 41 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Peter M. Hecht |
3/4/5
13D/G
Director, 10%+ Owner
|
19%
from 13D/G
|
$3,086,022
910,336 shares
mixed-class rows
|
— | 16 Jul 2026 |
| FMR LLC |
13F
13D/G
Company
|
15%
from 13D/G
|
$2,201,963
649,547 shares
|
— | 30 Jun 2026 |
| BALYASNY ASSET MANAGEMENT L.P. |
13D/G
13F
Company
|
7.3%
|
$1,247,818
317,511 shares
|
$0 | 30 Jun 2026 |
| ADAR1 Capital Management, LLC |
13D/G
13F
Company
|
7%
|
$1,174,115
298,757 shares
|
$0 | 30 Jun 2026 |
| J. WOOD CAPITAL ADVISORS LLC |
13D/G
|
5.4%
|
$496,363
181,818 shares
|
$0 | 25 Mar 2025 |
| American Endowment Foundation |
13D/G
|
4.9%
|
$492,196
133,026 shares
|
$0 | 31 Dec 2024 |
| TYNDALL CAPITAL PARTNERS L P |
13D/G
|
4.8%
|
$487,287
155,187 shares
|
-$30,113 | 30 Jun 2025 |
| Kalehua Capital Management LLC |
13F
Company
|
39%
|
$5,598,077
1,651,350 shares
|
— | 30 Jun 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 02 Sep 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to Cyclerion Therapeutics, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Peter M. Hecht
Net 12M change
$0
Latest report
14 Aug 2026
Recent insider transactions for Cyclerion Therapeutics, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Rhonda M. Chicko | CYCN | Common Stock, no par value | Options Exercise | 138888.9% | 25,000 | 25,018 | 14 Aug 2026 | Direct | ||
| Rhonda M. Chicko | CYCN | Option to Purchase | Options Exercise | -100% | -25,000 | 0 | 14 Aug 2026 | Direct | ||
| Regina Margaret Graul | CYCN | Common Stock, no par value | Tax liability | -31.1% | -48,629 | 107,523 | 14 Aug 2026 | Direct | ||
| Regina Margaret Graul | CYCN | Common Stock, no par value | Options Exercise | 55.7% | 55,849 | 156,152 | 14 Aug 2026 | Direct | ||
| Regina Margaret Graul | CYCN | Option to Purchase | Options Exercise | -100% | -55,849 | 0 | 14 Aug 2026 | Direct | ||
| Peter M. Hecht | CYCN | Common Stock | Conversion of derivative security | 62.8% | 351,037 | 910,240 | 16 Jul 2026 | Direct | ||
| Peter M. Hecht | CYCN | Series A Convertible Preferred Stock | Conversion of derivative security | -100% | -351,037 | 0 | 16 Jul 2026 | Direct |
* marks a reported price that did not pass the local price check.