0001728117-26-000088.txt : 20260904 0001728117-26-000088.hdr.sgml : 20260904 20260904165038 ACCESSION NUMBER: 0001728117-26-000088 CONFORMED SUBMISSION TYPE: D PUBLIC DOCUMENT COUNT: 1 ITEM INFORMATION: Rule 506(b) provides a "safer harbor" for a private offering FILED AS OF DATE: 20260904 DATE AS OF CHANGE: 20260904 EFFECTIVENESS DATE: 20260904 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Gossamer Bio, Inc. CENTRAL INDEX KEY: 0001728117 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] ORGANIZATION NAME: 03 Life Sciences EIN: 475461709 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: D SEC ACT: 1933 Act SEC FILE NUMBER: 021-596541 FILM NUMBER: 261362657 BUSINESS ADDRESS: STREET 1: 3115 MERRYFIELD ROW STREET 2: SUITE 120 CITY: SAN DIEGO STATE: CA ZIP: 92121 BUSINESS PHONE: (858) 684-1300 MAIL ADDRESS: STREET 1: 3115 MERRYFIELD ROW STREET 2: SUITE 120 CITY: SAN DIEGO STATE: CA ZIP: 92121 D 1 primary_doc.xml X0708 D LIVE 0001728117 Gossamer Bio, Inc. 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 (858) 684-1300 DELAWARE None None Corporation true Faheem Hasnain 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Executive Officer Director Russell Cox 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director Thomas Daniel 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director Skye J. Drynan 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director Sandra Milligan 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director Steven D. Nathan 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director John Quisel 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Director Bryan Giraudo 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Executive Officer Christian Waage 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Executive Officer Robert Smith 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Executive Officer Caryn Peterson 3115 Merryfield Row, Suite 120 San Diego CA CALIFORNIA 92121 Executive Officer Biotechnology Decline to Disclose 06b false 2026-08-20 false true true false 0 Leerink Partners LLC 39011 None None 53 State St., 40th Floor Boston MA MASSACHUSETTS 02109 All States true Cantor Fitzgerald & Co. 134 None None 110 East 59th St., 4th Floor New York NY NEW YORK 10022 All States false 150000000 25000000 125000000 false 38 1375000 true 0 0 false Gossamer Bio, Inc. /s/ Bryan Giraudo Bryan Giraudo COO & CFO 2026-09-04