0000950170-25-062123.txt : 20250501 0000950170-25-062123.hdr.sgml : 20250501 20250501181657 ACCESSION NUMBER: 0000950170-25-062123 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20250429 FILED AS OF DATE: 20250501 DATE AS OF CHANGE: 20250501 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Harwin Peter Evan CENTRAL INDEX KEY: 0001663607 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40544 FILM NUMBER: 25904845 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: Fairmount Healthcare Fund II L.P. CENTRAL INDEX KEY: 0001769651 ORGANIZATION NAME: STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-40544 FILM NUMBER: 25904847 BUSINESS ADDRESS: STREET 1: 200 BARR HARBOR DRIVE STREET 2: SUITE 400 CITY: WEST CONSHOHOCKEN STATE: PA ZIP: 19428 BUSINESS PHONE: (267) 760-4066 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: 001-40544 FILM NUMBER: 25904846 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: 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: 001-40544 FILM NUMBER: 25904848 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 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Jade Biosciences, Inc. CENTRAL INDEX KEY: 0001798749 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences EIN: 831377888 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 221 CRESCENT ST. STREET 2: BUILDING 23, SUITE 105 CITY: WALTHAM STATE: MA ZIP: 02453 BUSINESS PHONE: (781) 312-3013 MAIL ADDRESS: STREET 1: 221 CRESCENT ST. STREET 2: BUILDING 23, SUITE 105 CITY: WALTHAM STATE: MA ZIP: 02453 FORMER COMPANY: FORMER CONFORMED NAME: Aerovate Therapeutics, Inc. DATE OF NAME CHANGE: 20200103 4 1 ownership.xml 4 X0508 4 2025-04-29 0001798749 Jade Biosciences, Inc. JBIO 0001802528 Fairmount Funds Management LLC 200 BARR HARBOR DRIVE, SUITE 400 WEST CONSHOHOCKEN PA 19428 true false true false 0001769651 Fairmount Healthcare Fund II L.P. 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 true false true false 0001830177 Kiselak Tomas 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 true false true false 0001663607 Harwin Peter Evan 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 true false true false false Stock Option (Right to Buy) 10.14 2025-04-29 4 A false 23017 0 A 2035-04-29 Common Stock 23017 23017 D This option represents a right to purchase 23,017 shares of the Issuer's common stock, which vests in full on the earlier of (i) April 29, 2026 or (ii) the date of the next annual meeting of the Issuer's stockholders, in each case, subject to the recipient's continued service to the Issuer. Under Mr. Kiselak's arrangement with Fairmount Funds Management LLC ("Fairmount"), Mr. Kiselak holds the option for one or more investment vehicles managed by Fairmount (each, a "Fairmount Fund"). Mr. Kiselak is obligated to turn over to Fairmount any net cash or stock received from the option for the benefit of such Fairmount Fund. Mr. Kiselak therefore disclaims beneficial ownership of the option and underlying common stock. Fairmount disclaims beneficial ownership of any of the reported securities, except to the extent of its pecuniary interest therein. Fairmount, Fairmount Healthcare Fund II LP and Fairmount Healthcare Co-Invest IV L.P. 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 manager of Fairmount. /s/ Tomas Kiselak, Managing Member of Fairmount Funds Management LLC 2025-05-01 /s/ Tomas Kiselak, Managing Member of Fairmount Healthcare Fund II L.P. 2025-05-01 /s/ Tomas Kiselak 2025-05-01 /s/ Peter Harwin 2025-05-01