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Form 3 Korsana Biosciences, For: Sep 08 Filed by: Violin Jonathan

September 10, 2026 5:37 PM
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
Violin Jonathan
(Last) (First) (Middle)
C/O KORSANA BIOSCIENCES, INC.
203 CRESCENT STREET, SUITE 503
(Street)
WALTHAM MA 02453
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
09/08/2026 		3. Issuer Name and Ticker or Trading Symbol
Korsana Biosciences, Inc. [ KRSA ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
X Officer (give title below) Other (specify below)
See Remarks
 5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 207,400 (1) (2)
D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) (1) (3) 10/26/2035 Common Stock 1,048,244 4.15 D
Stock Option (Right to Buy) (1) (4) 06/29/2036 Common Stock 1,984,157 8.06 D
Explanation of Responses:
1. Effective as of September 8, 2026 (the "Effective Time"), (i) Cariboos Merger Sub Corp., a wholly owned subsidiary of Cyclerion Therapeutics, Inc. ("Cyclerion"), merged with and into Korsana Biosciences, Inc. ("Pre-Merger Korsana"), with Pre-Merger Korsana continuing as a wholly owned subsidiary of Cyclerion and the surviving corporation of the merger (the "First Merger"), and (ii) immediately thereafter, Pre-Merger Korsana merged with and into Cariboos Merger Sub II, LLC, a second wholly owned subsidiary of Cyclerion ("Second Merger Sub"), with Second Merger Sub being the surviving entity of the merger under the name Korsana Biosciences Operating Company, LLC (the "Second Merger" and, together with the First Merger, the "Merger"). At the Effective Time, Cyclerion changed its name to "Korsana Biosciences, Inc." (hereinafter, the "Issuer").
2. Represents shares of the Issuer's common stock received by the Reporting Person in the Merger in exchange for the shares of Pre-Merger Korsana's common stock held by the Reporting Person prior to the Merger. Each share of Pre-Merger Korsana's restricted common stock held at the Effective Time was exchanged for 0.2074 restricted shares of the Issuer's common stock. Of these shares of common stock, 142,588 remain subject to forfeiture restrictions and vest in equal monthly installments through June 1, 2029, subject to the Reporting Person's continued service to the Issuer on each such vesting date.
3. Represents options to purchase shares of the Issuer's common stock received by the Reporting Person in the Merger in exchange for options of Pre-Merger Korsana held by the Reporting Person prior to the Merger. This option vested as to 25% on June 1, 2026 and vests in equal monthly installments thereafter through June 1, 2029, subject to the Reporting Person's continued service to the Issuer on each such vesting date.
4. Represents options to purchase shares of the Issuer's common stock received by the Reporting Person in the Merger in exchange for options of Pre-Merger Korsana held by the Reporting Person prior to the Merger. This option will vest as to 25% on June 18, 2027 and in equal monthly installments thereafter through June 18, 2030, subject to the Reporting Person's continued service to the Issuer on each such vesting date.
Remarks:
Chief Executive Officer and President
Exhibit 24 - Power of Attorney
/s/ Mark Vignola, as attorney-in-fact for Jonathan Violin 09/10/2026
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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ATTACHMENTS / EXHIBITS

EX-24

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