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See how Context works →On the price, the facts of the public record◇Significant stake declared (13D)●Results filed
With an account, also○dividends▲splits◌next earningswith an account
End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.
Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Sep 23, 2026Notice of sale · Form 144ERROL B DE SOUZA · Director · $171.6KOpen the filing ↗
- Sep 22, 2026Notice of sale · Form 144ERROL B DE SOUZA · Director · $3.5KOpen the filing ↗
- Sep 18, 2026Notice of sale · Form 144ERROL B DE SOUZA · Director · $74.8KOpen the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year244
SEC filings on record36042 flagged findings
Reported transactions (Form 4)28since May 19, 2023 · and 20 other holdings
Corporate events (8-K)30since Jun 4, 2021
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
Regulatory history
Topics detected in its SEC reports, with the original excerpt.
Each topic is assigned by a classifier over the full filing; the excerpts show where it was detected and are not always enough to verify it. Open the filing to read it in full.
- 2026-06-09share offering or dilution eventrecentOpen filing ↗“…offering. In connection with the 2025 Equity Private Placement, the Company entered into a Registration Rights Agreement with the…”
- 2026-06-09listing compliance noticerecentOpen filing ↗“…not currently subject to any panel monitor, grace period, or other conditional listing status arising out of the Prior Nasdaq…”
+1 more passage from the same document
- “…investors or investment funds. As a result, the trading liquidity of Cyclerion Common Stock may not necessarily improve. The reverse…”
- 2026-06-09capital return (buybacks/dividends)recentOpen filing ↗“…in estimates are reflected in reported results in the period in which they become known. Cash and Cash Equivalents The Company…”
+1 more passage from the same document
- “…December 31, 2025, in exchange for executive services and such issuance was determined to be a related party transaction (see Note…”
- 2026-06-09Department of Justice inquiryrecentOpen filing ↗“…the expiration or termination of any applicable waiting period (and any extension thereof) under the HSR Act and the absence of any…”
+1 more passage from the same document
- “…delays, issuance of warning letters and other types of enforcement letters, product recalls, product seizures, total or…”
- 2026-06-09merger or acquisition eventrecentOpen filing ↗“…PROXY STATEMENT/PROSPECTUS SUBJECT TO COMPLETION, DATED JUNE 9, 2026 PROPOSED MERGER YOUR VOTE IS VERY IMPORTANT To the…”
+1 more passage from the same document
- “…cash equivalents of $134.2 million. Based on its current operating plan, Korsana has concluded its existing cash and cash…”
- 2026-06-09reverse splitrecentOpen filing ↗“…In March 2023, the Company entered into a stock purchase agreement with the Company’s former Chief Executive Officer (the “CEO”)…”
+1 more passage from the same document
- “…Agreement In March 2023, the Company entered into a stock purchase agreement with the Company’s former Chief Executive Officer (the…”
- 2026-05-12share offering or dilution eventrecentOpen filing ↗“…offering. In connection with the 2025 Equity Private Placement, the Company entered into a Registration Rights Agreement with the…”
+1 more passage from the same document
- “…stock, warrants and units of any combination thereof for an aggregate initial offering price not to exceed $25.0 million. The…”
- 2026-05-12merger or acquisition eventrecentOpen filing ↗“…proceeds of $ 2.1 million under the Sales Agreement, after deducting commissions paid to Guggenheim Securities of $ 0.1 million.…”
+1 more passage from the same document
- “…of $ 0.1 million. During the three months ended March 31, 2026, the Company sold 405,000 shares of common stock under the Sales…”
16 older entries not shown
Original excerpts from SEC filings, untranslated. Not advice and not a prediction.
Reverse splits in 5 years
2 reverse splits in 5 years (1:20 on May 16, 2023, 1:7 on Sep 9, 2026) · 1:140 cumulative
The other times: of 246 securities that repeated a reverse split in 5 years, a year later the median was worth 0.10× the price on the day of the split; 189 lost more than half and 21 rose (243 with a price a year later).
Our own series, not the whole market: based on the splits we have on record (provider and SEC); an unrecorded one does not count. Historical distribution, not a prediction.
The 25 most recent filings (of 360)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Oct 15, 26SCHEDULE 13G/A ↗Passive stake · J. Wood Capital Advisors LLC · 0.1% · event on Sep 30, 26 · amendment new
- Oct 15, 26DEF 14A ↗Shareholder meeting and votes new
- Oct 7, 26SCHEDULE 13G/A ↗Passive stake · FMR LLC · 6.9% · event on Sep 30, 26 · amendment
- Oct 5, 26PRE 14A ↗Shareholder meeting and votes
Notice of proposed sale · 3 Form 144 filingsshow all 3hide
- Sep 23, 26Form 144 ↗Notice of proposed sale
- Sep 22, 26Form 144 ↗Notice of proposed sale
- Sep 18, 26Form 144 ↗Notice of proposed sale
- Sep 18, 26SCHEDULE 13G ↗Passive stake · GENERAL ATLANTIC, L.P. · 6.8% · event on Sep 8, 26
- Sep 16, 26SCHEDULE 13G ↗Passive stake · Wellington Biomedical Innovation Master Investors (Cayman) II, L.P. · 6.1% · event on Sep 9, 26
- Sep 15, 26SCHEDULE 13D ↗Stake with intent to influence · Venrock Healthcare Capital Partners III, L.P. · 9.9% · event on Sep 8, 26
- Sep 11, 26SCHEDULE 13D ↗Stake with intent to influence · Fairmount Funds Management LLC · 20.0% · event on Sep 8, 26
- Sep 11, 268-K ↗Current report · Entered a material agreement
Insider transaction · 8 Form 3 filingsshow all 8hide
- Aug 27, 268-K ↗Current report · Shareholder vote results · Other events
360 filings on record, the oldest from Nov 6, 18.
Listing the 25 most recent filings of the 360 on record.
42119
7 material agreements entered2024 – 2026show all 7hide
- Sep 11, 26Entered a material agreement+11 more in the same filing8-K 1.01 ↗
- Apr 1, 26Entered a material agreement+4 more in the same filing8-K 1.01 ↗
- Jan 6, 26Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Sep 23, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- May 7, 25Entered a material agreement+1 more in the same filing8-K 1.01 ↗
- Mar 25, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Dec 17, 24Entered a material agreement+2 more in the same filing8-K 1.01 ↗
5 senior executive changes2023show all 5hide
- Dec 4, 23A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Dec 1, 23A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Nov 24, 23A senior executive left or was appointed8-K 5.02 ↗
- Oct 23, 23A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Jun 27, 23A senior executive left or was appointed8-K 5.02 ↗
- May 25, 23Sold unregistered shares+2 more in the same filing8-K 3.02 ↗
- May 12, 23Entered a material agreement+5 more in the same filing8-K 1.01 ↗
- Nov 29, 22Listing notice (8-K 3.01)8-K 3.01 ↗
- Oct 6, 22Restructuring plan with committed costs+2 more in the same filing8-K 2.05 ↗
- Sep 30, 22A senior executive left or was appointed8-K 5.02 ↗
- Jul 26, 22A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Jun 3, 22Listing notice (8-K 3.01)8-K 3.01 ↗
- Oct 28, 21A senior executive left or was appointed8-K 5.02 ↗
- Aug 19, 21A senior executive left or was appointed8-K 5.02 ↗
- Jun 4, 21Entered a material agreement+2 more in the same filing8-K 1.01 ↗
The record reaches back to Mar 19, 19.
Stress disclosures older than the timeline above. They are individual events from the record, not a complete timeline: there may be more between them.
- Oct 30, 19Restructuring plan with committed costs+3 more in the same filing8-K 2.05 ↗
The full record holds 4 stress filings.
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Schedule 13D: stake and stated purpose
Filed by holders above 5% of a share class who cannot use the short form. It includes the investor's stated purpose: read it before assuming they seek influence.
- Fairmount Funds Management LLC20.0%Sep 8, 26SCHEDULE 13D ↗5 co-filers on this document — the figure is the largest single stake, not their sum.
- Peter M. Hecht19.4%Jul 16, 26SCHEDULE 13D/A ↗1 earlier filing
- Venrock Healthcare Capital Partners III, L.P.9.9%Sep 8, 26SCHEDULE 13D ↗9 co-filers on this document — the figure is the largest single stake, not their sum.
Schedule 13G: short-form filing
The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.
- BALYASNY ASSET MANAGEMENT L.P.7.3%Jun 30, 26SCHEDULE 13G ↗5 co-filers on this document — the figure is the largest single stake, not their sum.
- ADAR1 Capital Management, LLC7.0%Jun 30, 26SCHEDULE 13G ↗2 co-filers on this document — the figure is the largest single stake, not their sum.
- FMR LLC6.9%Sep 30, 26SCHEDULE 13G/A ↗2 co-filers on this document — the figure is the largest single stake, not their sum. · 2 earlier filings
- GENERAL ATLANTIC, L.P.6.8%Sep 8, 26SCHEDULE 13G ↗17 co-filers on this document — the figure is the largest single stake, not their sum.
- Wellington Biomedical Innovation Master Investors (Cayman) II, L.P.6.1%Sep 9, 26SCHEDULE 13G ↗
show 3 more holdershide
- American Endowment Foundation4.9%Dec 31, 24SCHEDULE 13G/A ↗
- Tyndall Capital Partners, L.P.4.8%Jun 30, 25SCHEDULE 13G/A ↗1 earlier filing
- J. Wood Capital Advisors LLC0.1%Sep 30, 26SCHEDULE 13G/A ↗2 co-filers on this document — the figure is the largest single stake, not their sum. · 1 earlier filing
Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.
Sale intention announced
On Sep 23, ERROL B DE SOUZA filed notice of intent to sell up to $172K. That is about 0.01% of shares outstanding.
A notice is not a sale: it may not go ahead, may happen in part, or at a different price.
No sale of theirs is on record yet in Form 4; the 90-day window is still open.
View notice (Form 144) ↗+2 more recent notices
Stock compensation, tax and giftsshow the 15 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Aug 14, 26Compensation$184KRegina Margaret GraulSee Remarks↗
- Aug 14, 26Tax$184KRegina Margaret GraulSee Remarks↗
- Aug 14, 26Compensation$59KRHONDA M. CHICKOChief Financial Officer↗
- Jul 16, 26Otheramount n/aPeter M Hecht↗
- Mar 25, 25Compensation$25KMichael J Higgins↗
- Mar 25, 25Compensation$500KPeter M Hecht↗
- Jan 1, 24Compensationamount n/aRegina Margaret GraulPresident↗
- Jan 1, 24Compensationamount n/aPeter M Hecht↗
- Dec 1, 23Compensationamount n/aPeter M Hecht↗
- Nov 30, 23Compensationamount n/aSteven Hyman↗
- Nov 30, 23Compensationamount n/aERROL B DESOUZA↗
- Nov 30, 23Compensationamount n/aERROL B DESOUZA↗
- Nov 30, 23Compensationamount n/aPeter M Hecht↗
- Nov 30, 23Compensationamount n/aTERRANCE MCGUIRE↗
- May 19, 23Compensation$2.0MPeter M HechtChief Executive Officer↗
The full record holds 17 transactions and goes back to May 19, 23.
Its sector and its market
Korsana Biosciences, Inc. among Health Care companies
The profile shows what is on record. Context and Radar place the company among those of its sector and region.
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- SEC records
- 360 documents on file, from Nov 6, 2018 to Oct 15, 2026.
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Which SEC documents appear here?
Those filed with the SEC by the company, its insiders and its major shareholders, within our coverage: periodic reports (10-K, 10-Q, 20-F), material events (8-K), proposed sale notices (Form 144), insider transactions (Form 4) and stakes above 5% (13D/13G). Each links to the original on EDGAR.
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