0000950170-24-039590.txt : 20240401 0000950170-24-039590.hdr.sgml : 20240401 20240401182123 ACCESSION NUMBER: 0000950170-24-039590 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20240401 FILED AS OF DATE: 20240401 DATE AS OF CHANGE: 20240401 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Fairmount Funds Management LLC CENTRAL INDEX KEY: 0001802528 ORGANIZATION NAME: STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38541 FILM NUMBER: 24811522 BUSINESS ADDRESS: STREET 1: 200 BARR HARBOR DRIVE STREET 2: SUITE 400 CITY: WEST CONSHOHOCKEN STATE: PA ZIP: 19428 BUSINESS PHONE: 267-262-5300 MAIL ADDRESS: STREET 1: 200 BARR HARBOR DRIVE STREET 2: SUITE 400 CITY: WEST CONSHOHOCKEN STATE: PA ZIP: 19428 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Kiselak Tomas CENTRAL INDEX KEY: 0001830177 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-38541 FILM NUMBER: 24811521 MAIL ADDRESS: STREET 1: 200 BARR HARBOR DRIVE STREET 2: SUITE 400 CITY: WEST CONSHOHOCKEN STATE: PA ZIP: 19428 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Dianthus Therapeutics, Inc. /DE/ CENTRAL INDEX KEY: 0001690585 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 300 TECHNOLOGY SQUARE STREET 2: 8TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 BUSINESS PHONE: 857-201-2700 MAIL ADDRESS: STREET 1: 300 TECHNOLOGY SQUARE STREET 2: 8TH FLOOR CITY: CAMBRIDGE STATE: MA ZIP: 02139 FORMER COMPANY: FORMER CONFORMED NAME: Magenta Therapeutics, Inc. DATE OF NAME CHANGE: 20161121 4 1 ownership.xml 4 X0508 4 2024-04-01 0001690585 Dianthus Therapeutics, Inc. /DE/ DNTH 0001802528 Fairmount Funds Management LLC 200 BARR HARBOR DRIVE, SUITE 400 WEST CONSHOHOCKEN PA 19428 true false false false 0001830177 Kiselak Tomas 200 BARR HARBOR DRIVE, SUITE 400 WEST CONSHOHOCKEN PA 19428 true false true false false Common Stock 2024-04-01 4 J false 58857 D 0 I By Fairmount Healthcare Fund LP Common Stock 2024-04-01 4 J false 58857 A 2700691 I By Fairmount Healthcare Fund II LP Common Stock 62146 I By Fairmount SPV III, LLC On April 1, 2024, in connection with the wind down of Fairmount Healthcare Fund LP ("Fund I"), all shares of common stock held by Fund I were transferred to Fairmount Healthcare Fund II LP ("Fund II"). Fairmount Funds Management LLC ("Fairmount") is the investment manager for Fund I. 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 securities held by Fund I for purposes of Rule 16a-1(a)(2), except to the extent of their pecuniary interest therein. Fairmount is the investment manager for Fund II. Fairmount, Fairmount GP, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the securities held by Fund II for purposes of Rule 16a-1(a)(2), except to the extent of their pecuniary interest therein. Fairmount is the Class A Member for Fairmount SPV III, LLC. Fairmount, Fairmount GP, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the securities held by Fairmount SPV III, LLC for purposes of Rule 16a-1(a)(2), except to the extent of their pecuniary interest therein. Fairmount, Fund I, Fund II 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 2024-04-01 /s/ Tomas Kiselak 2024-04-01