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SEC FORM 3 SEC Form 3
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*
Fairmount Funds Management LLC
(Last) (First) (Middle)
200 BARR HARBOR DRIVE, SUITE 400
(Street)
WEST CONSHOHOCKEN PA 19428
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
09/11/2023 		3. Issuer Name and Ticker or Trading Symbol
Dianthus Therapeutics, Inc. /DE/ [ DNTH ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director X 10% Owner
Officer (give title below) Other (specify below)
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X 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 1,819,579(1)(2) I See footnote(3)
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
1. Name and Address of Reporting Person*
Fairmount Funds Management LLC
(Last) (First) (Middle)
200 BARR HARBOR DRIVE, SUITE 400
(Street)
WEST CONSHOHOCKEN PA 19428
(City) (State) (Zip)
1. Name and Address of Reporting Person*
Kiselak Tomas
(Last) (First) (Middle)
200 BARR HARBOR DRIVE, SUITE 400
(Street)
WEST CONSHOHOCKEN PA 19428
(City) (State) (Zip)
1. Name and Address of Reporting Person*
Harwin Peter Evan
(Last) (First) (Middle)
200 BARR HARBOR DRIVE, SUITE 400
(Street)
WEST CONSHOHOCKEN PA 19428
(City) (State) (Zip)
Explanation of Responses:
1. Effective as of September 11, 2023 (the "Effective Time"), a wholly-owned subsidiary of Magenta Therapeutics, Inc. ("Magenta"), merged (the "Merger") with and into Dianthus Therapeutics, Inc. ("Dianthus") resulting in, among other things, Dianthus becoming a wholly owned subsidiary of Magenta. At the Effective Time, Magenta effected a name change to "Dianthus Therapeutics, Inc." (hereinafter, the "Issuer").
2. Represents the number of shares of common stock of the Issuer received by the Reporting Persons in the Merger in exchange for the shares of Dianthus held by the Reporting Persons prior to the Merger. Each share of Dianthus common stock held at the Effective Time was exchanged for 0.2181 shares of the Issuer's common stock, which gives effect to the reverse stock split of common stock effected by the Issuer and the Merger exchange ratio.
3. Consists of (i) 58,129 shares of common stock held of record by Fairmount Healthcare Fund LP, (ii) 1,699,304 shares of common stock held of record by Fairmount Healthcare Fund II LP and (iii) 62,146 shares of common stock held of record by Fairmount SPV III, LLC. Fairmount Funds Management LLC ("Fairmount") is the investment manager for Fairmount Healthcare Fund LP and Fairmount Healthcare Fund II LP and is the Class A Member for Fairmount SPV III, LLC. The general partner of Fairmount is Fairmount Funds Management GP LLC ("Fairmount GP"), of which Peter Harwin and Tomas Kiselak are the managing members. Fairmount, Fairmount GP, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.
Remarks:
Exhibit 24 - Power of Attorney Fairmount, Fairmount Healthcare Fund LP, Fairmount Healthcare Fund II LP and Fairmount SPV III, LLC may each be deemed a director by deputization of the Issuer by virtue of the fact that Tomas Kiselak serves on the board of directors of the Issuer and is a Managing Member of Fairmount.
/s/ Tomas Kiselak, Managing Member of Fairmount Funds Management LLC 09/13/2023
/s/ Tomas Kiselak 09/13/2023
/s/ Peter Harwin 09/13/2023
** 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 5 (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.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
EX-24

 

POWER OF ATTORNEY

Know all by these presents that the undersigned hereby constitutes and appoints each of Marino Garcia, Ryan Savitz, Edward Carr, Adam Veness, Branden Berns, and Ryan Murr, and any of their substitutes, signing singly, as the undersigned’s true and lawful attorney-in-fact to:

1.
prepare, execute in the undersigned’s name and on the undersigned’s behalf, and submit to the U.S. Securities and Exchange Commission (the “SEC”) a Form ID, including amendments thereto, and any other document necessary or appropriate to obtain codes, passwords, and passphrases enabling the undersigned to make electronic filings with the SEC of reports require by the Securities Exchange Act of 1934 or any rule or regulation of the SEC;
2.
execute for and on behalf of the undersigned, in the undersigned’s capacity as a director, officer and/or ten percent stockholder of Dianthus Therapeutics, Inc. (the “Company”), Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;
3.
do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any securities exchange or similar authority; and
4.
take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that each such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned also ratifies hereby any action previously taken by each attorney-in-fact that would have been authorized by this power of attorney if it has been in effect at the time such action was taken. The undersigned acknowledges that each attorney-in-fact, in serving in such capacity at the request of the undersigned, is not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned’s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to each of the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of August 24, 2023.

/s/ Tomas Kiselak

Tomas Kiselak