0001104659-25-059166.txt : 20250613 0001104659-25-059166.hdr.sgml : 20250613 20250613080033 ACCESSION NUMBER: 0001104659-25-059166 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20250612 FILED AS OF DATE: 20250613 DATE AS OF CHANGE: 20250613 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: VAN NOSTRAND ROBERT L CENTRAL INDEX KEY: 0001225198 ORGANIZATION NAME: FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-33958 FILM NUMBER: 251044774 MAIL ADDRESS: STREET 1: C/O ACHILLION PHARMACEUTICALS, INC. STREET 2: 300 GEORGE STREET CITY: NEW HAVEN STATE: CT ZIP: 06511 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: SELLAS Life Sciences Group, Inc. CENTRAL INDEX KEY: 0001390478 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: 7 TIMES SQUARE STREET 2: SUITE 2503 CITY: NEW YORK STATE: NY ZIP: 10036 BUSINESS PHONE: 6462005278 MAIL ADDRESS: STREET 1: 7 TIMES SQUARE STREET 2: SUITE 2503 CITY: NEW YORK STATE: NY ZIP: 10036 FORMER COMPANY: FORMER CONFORMED NAME: Galena Biopharma, Inc. DATE OF NAME CHANGE: 20110926 FORMER COMPANY: FORMER CONFORMED NAME: RXi Pharmaceuticals Corp DATE OF NAME CHANGE: 20110926 FORMER COMPANY: FORMER CONFORMED NAME: GALENA BIOPHARMA, INC. DATE OF NAME CHANGE: 20110922 4 1 tm2517920-1_4seq1.xml OWNERSHIP DOCUMENT X0508 4 2025-06-12 0 0001390478 SELLAS Life Sciences Group, Inc. SLS 0001225198 VAN NOSTRAND ROBERT L C/O SELLAS LIFE SCIENCES GROUP, INC., 7 TIMES SQUARE, SUITE 2503 NEW YORK NY 10036 1 0 0 0 0 Common Stock 2025-06-12 4 P 0 10000 1.48 A 20400 D /s/ Daniel Bagliebter, Power of Attorney For: Robert L. Van Nostrand 2025-06-13