Gossamer Bio (GOSS) Earnings Call Presentation

Seralutinib Partnership with Chiesi - Chiesi will provide a $160 million immediate development reimbursement to Gossamer[13] - Gossamer and Chiesi will split US profits 50/50, with mid-to-high teens royalties to Gossamer ex-US[13] - Regulatory milestones could reach up to $146 million, and sales milestones up to $180 million[13] - R&D costs will be split 50/50 worldwide, with Gossamer leading global development and US commercialization of PAH & PH-ILD[13] - Gossamer has a pro forma cash position of approximately $396 million[20, 38] Seralutinib in PAH - Seralutinib is in an ongoing registrational Phase 3 trial for PAH, with topline results expected in Q4 2025[13, 24, 26] - The PROSERA Phase 3 study is a double-blind, placebo-controlled trial with 175 patients per arm[26] - The US has approximately 30,000 to 50,000 PAH patients, with a 5-year survival rate of 57%[13, 22, 23, 35] Seralutinib in PH-ILD - The US has approximately 60,000 to 100,000 PH-ILD patients[13, 29, 35] - The median 5-year survival for PH-ILD patients is 23%[13, 35] - A Phase 3 study in PH-ILD is expected to begin in mid-2025[13, 20] - Only one therapy is approved for PH-ILD in the US[29, 30, 35]