0001104659-26-038546.txt : 20260401 0001104659-26-038546.hdr.sgml : 20260401 20260401163031 ACCESSION NUMBER: 0001104659-26-038546 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20260331 FILED AS OF DATE: 20260401 DATE AS OF CHANGE: 20260401 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: 001-42270 FILM NUMBER: 26828739 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: 001-42270 FILM NUMBER: 26828741 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: 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: 001-42270 FILM NUMBER: 26828742 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: 001-42270 FILM NUMBER: 26828740 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: Zenas BioPharma, Inc. CENTRAL INDEX KEY: 0001953926 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences EIN: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 852 WINTER STREET, SUITE 250 CITY: WALTHAM STATE: MA ZIP: 02451 BUSINESS PHONE: 857-271-2954 MAIL ADDRESS: STREET 1: 852 WINTER STREET, SUITE 250 CITY: WALTHAM STATE: MA ZIP: 02451 FORMER COMPANY: FORMER CONFORMED NAME: Zenas BioPharma (Cayman) Ltd DATE OF NAME CHANGE: 20221108 4 1 tm2610877-1_4seq1.xml OWNERSHIP DOCUMENT X0609 4 2026-03-31 0 0001953926 Zenas BioPharma, Inc. ZBIO 0001802528 Fairmount Funds Management LLC false 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 1 0 0 0 0001769651 Fairmount Healthcare Fund II L.P. false 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 1 0 0 0 0001830177 Kiselak Tomas false 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 1 0 0 0 0001663607 Harwin Peter Evan false 200 BARR HARBOR DRIVE SUITE 400 WEST CONSHOHOCKEN PA 19428 1 0 0 0 0 Common Stock 2026-03-31 4 P 0 150000 20 A 2359025 I By Fairmount Healthcare Fund II L.P. Fairmount Funds Management LLC ("Fairmount") is the investment manager for Fairmount Healthcare Fund II L.P. The managers of Fairmount are Peter Harwin and Tomas Kiselak. Fairmount, Mr. Harwin, and Mr. Kiselak disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein. Fairmount may be deemed a director by deputization of Issuer by virtue of the fact that Tomas Kiselak serves on the board of directors of the Issuer and is also a Managing Member of Fairmount. /s/ Tomas Kiselak, Managing Member of Fairmount Funds Management LLC 2026-04-01 /s/ Tomas Kiselak, Managing Member of Fairmount Healthcare Fund II, L.P. 2026-04-01 /s/ Tomas Kiselak 2026-04-01 /s/ Peter Harwin 2026-04-01