Gossamer Bio, Inc., a clinical-stage biopharmaceutical company, focuses on discovering, acquiring, developing, and commercializing therapeutics in the disease areas of immunology, inflammation, and oncology in the United States. The company is developing GB002, an inhaled, small molecule, platelet-derived growth factor receptor, or PDGFR, colonystimulating factor 1 receptor, or CSF1R, and c-KIT inhibitor for the treatment of pulmonary arterial hypertension; GB004, a gut-targeted, oral small molecule for the treatment of inflammatory bowel disease; GB5121, an oral, irreversible, covalent, small molecule inhibitor of Bruton's Tyrosine Kinase for the treatment of primary central nervous system lymphoma; and GB7208, an oral, small molecule, BTK inhibitor for the treatment of multiple sclerosis. It has license agreements with Pulmokine, Inc. to develop and commercialize GB002 and related backup compounds; and Aerpio Pharmaceuticals, Inc. to develop and commercialize GB004 and related compounds. The company was formerly known as FSG, Bio, Inc. and changed its name to Gossamer Bio, Inc. in 2017. Gossamer Bio, Inc. was incorporated in 2015 and is headquartered in San Diego, California.
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- Vertex Pharmaceuticals, but focused on inflammatory and immunological diseases instead of cystic fibrosis.
- An earlier-stage Amgen, specializing in developing new drugs for inflammatory and immunological diseases.
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- Seralutinib (GB002): A small molecule inhibitor in Phase 3 clinical trials for the treatment of pulmonary arterial hypertension (PAH).
- GB7208: An oral BTK inhibitor currently in Phase 2 development for the treatment of relapsing multiple sclerosis (RMS).
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As a clinical-stage biopharmaceutical company, Gossamer Bio (GOSS) is primarily focused on the discovery, development, and clinical trials of drug candidates and does not currently have major customers from product sales. The company has explicitly stated in its financial filings that it has not generated any revenue from product sales to date.
The company's revenue primarily comes from financing activities (e.g., equity raises) to fund its research and development. However, in terms of collaboration revenue, their 2023 Annual Report (10-K) indicates they recognized a minimal amount of collaboration revenue primarily from research activities under a license agreement with the following company:
- Novartis AG (symbol: NVS)
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Faheem Hasnain, Co-Founder, Chairman, and Chief Executive Officer
Mr. Hasnain is the Co-Founder, Chairman, and Chief Executive Officer of Gossamer Bio. Prior to co-founding Gossamer Bio, he served as President, CEO, and a Director of Receptos, Inc. from November 2010 to August 2015, which was then acquired by Celgene Corporation. He was also the President and Chief Executive Officer and a director of Facet Biotech Corporation from December 2008 until its acquisition by Abbott Laboratories in April 2010. Mr. Hasnain also held leadership roles at PDL BioPharma, Inc., Biogen Idec Inc., Bristol Myers Squibb, and GlaxoSmithKline.
Bryan Giraudo, Chief Operating Officer & Chief Financial Officer
Mr. Giraudo has served as the Chief Financial Officer of Gossamer Bio since May 2018 and Chief Operating Officer since September 2021. He has completed nearly $1.0 billion in financings for Gossamer since its inception, including Series B, IPO, and additional debt and equity financings. Prior to joining Gossamer, Mr. Giraudo was a Senior Managing Director at Leerink Partners from 2009 to April 2018, where he was responsible for their western North America and Asia Pacific biotechnology and medical technology banking practice. Before Leerink, he was a Managing Director at Merrill Lynch & Co.'s Global Healthcare Investment Banking Group.
Richard Aranda, M.D., Chief Medical Officer
Dr. Aranda has served as the Chief Medical Officer of Gossamer Bio since June 2021, having previously been the Senior Vice President and Head of Clinical Development since joining the company in February 2018.
Christian Waage, Executive Vice President, Technical Operations & Administration
Mr. Waage serves as the Executive Vice President of Technical Operations & Administration at Gossamer Bio.
Deanna Weber, Executive Vice President, Human Resources
Ms. Weber is the Executive Vice President of Human Resources at Gossamer Bio. She brings over 25 years of diverse Human Resources experience from the Biotechnology and Fortune 500 sectors.
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The key risks to Gossamer Bio (GOSS) are primarily associated with its status as a clinical-stage biopharmaceutical company developing therapies for serious conditions.
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Clinical Trial and Regulatory Risk: Gossamer Bio's future largely hinges on the successful outcome of its lead asset, seralutinib, which is currently in Phase 3 clinical trials for pulmonary arterial hypertension (PAH) and pulmonary hypertension associated with interstitial lung disease (PH-ILD). Negative results from these late-stage trials, or any significant delays in their commencement, enrollment, or completion, could materially harm the business and lead to a negative stock reaction. Furthermore, even with successful trials, there remains the risk of failing to obtain necessary regulatory approvals from agencies like the FDA for commercialization.
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Competition: Gossamer Bio faces substantial competitive pressure in the PAH/PH-ILD therapeutic area. Merck's Winrevair (sotatercept), which has already received FDA approval and demonstrated impressive clinical data, poses a significant competitive threat to seralutinib. Additionally, established and potentially lower-cost generic therapies could challenge the market adoption of a new inhibitor like seralutinib.
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Financial Risk and Need for Additional Capital: As a clinical-stage company, Gossamer Bio is not yet profitable and has consistently reported net losses and negative free cash flow. The extensive costs associated with conducting late-stage clinical trials contribute to a high cash burn rate, creating a risk of dilution as the company may need to raise additional equity. An inability to secure further funding could force the company to delay, limit, or even terminate the development and potential commercialization of seralutinib. The company has also reported negative stockholders' equity.
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The strong efficacy and impending market approval of Merck's sotatercept for pulmonary arterial hypertension (PAH) represent a clear emerging threat. Sotatercept, with a novel mechanism of action (targeting Activin receptor type IIA) and demonstrated significant improvements in clinical worsening and survival in its Phase 3 STELLAR trial, is poised to enter the PAH market potentially before Gossamer Bio's lead candidate, Seralutinib (GB002), has completed its Phase 3 trials and gained approval. This could significantly constrain the future market opportunity and pricing power for Seralutinib by setting a new, higher standard of care and capturing substantial market share early, even if Seralutinib is successful in its own trials.
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Gossamer Bio (symbol: GOSS) focuses primarily on the development of seralutinib (GB002), an inhaled tyrosine kinase inhibitor. This product candidate is being developed for two main indications: Pulmonary Arterial Hypertension (PAH) and Pulmonary Hypertension associated with Interstitial Lung Disease (PH-ILD).
The addressable markets for seralutinib are:
- Pulmonary Arterial Hypertension (PAH): The global PAH market is projected to reach $11.2 billion by 2030. In the U.S. alone, there are approximately 50,000 PAH patients. The U.S. PAH treatment market was valued at approximately $3.9 billion in 2022 and is expected to increase. DelveInsight estimates the U.S. PAH market was approximately $6 billion in 2024. Another estimate for the broader pulmonary hypertension market, which includes PAH, suggests it could exceed $7 billion globally by 2030.
- Pulmonary Hypertension associated with Interstitial Lung Disease (PH-ILD): This market is globally estimated to include 400,000 patients. The U.S. PH-ILD market was valued at $1.1 billion in 2023 and is anticipated to grow considerably through 2034. Gossamer Bio believes seralutinib could capture a share in a $3 billion total addressable market (TAM) for PH-ILD.
Gossamer Bio also has other product candidates in its pipeline. GB004 was being developed for inflammatory bowel disease, including ulcerative colitis and Crohn's disease, but Phase 2 study results in ulcerative colitis did not show statistically significant or clinically meaningful differences. Another candidate, GB5121, is an oral, CNS-penetrant BTK inhibitor for the treatment of PCNSL (Primary Central Nervous System Lymphoma) and other CNS oncology indications. The global BTK inhibitor market, which includes the class of drug GB5121 belongs to, was estimated at $9.4 billion in 2024 and is projected to grow to $28.9 billion by 2034. The North American BTK inhibitor market alone was $3.8 billion in 2024, with the U.S. contributing $3.1 billion in 2023. However, a specific addressable market size for GB5121's targeted indications (PCNSL) within this broader market was not identified.
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Expected Drivers of Future Revenue Growth for Gossamer Bio (GOSS)
Over the next 2-3 years, Gossamer Bio's revenue growth is expected to be primarily driven by the advancement and potential commercialization of its lead product candidate, seralutinib, along with its strategic collaboration.
- Successful Commercialization of Seralutinib for Pulmonary Arterial Hypertension (PAH): Gossamer Bio's most significant revenue driver is the successful outcome of the Phase 3 PROSERA study for seralutinib in pulmonary arterial hypertension (PAH). Topline results from this study are anticipated in February 2026. Positive results, leading to subsequent regulatory approvals and market launch, would mark the company's transition from a clinical-stage to a commercial-stage entity, generating product sales revenue.
- Advancement of Seralutinib for Pulmonary Hypertension Associated with Interstitial Lung Disease (PH-ILD): The initiation and progression of the Phase 3 SERENATA trial for seralutinib in PH-ILD, with site activations expected in the fourth quarter of 2025, represent another key driver. Successful clinical development and eventual commercialization in this indication would expand the addressable market for seralutinib and contribute significantly to future revenue streams.
- Leveraging the Strategic Partnership with Chiesi: Gossamer Bio's ongoing strategic partnership with Chiesi is a crucial element for future revenue. This collaboration currently contributes through cost reimbursements and is expected to be instrumental in the successful commercial launch of seralutinib for PAH, assuming regulatory approval. The partnership provides financial support and commercialization expertise, which will facilitate market penetration and revenue generation.
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Share Issuance
- Gossamer Bio's total shares outstanding increased by 4.01% in the last year.
- The company's shares outstanding grew from approximately 226.6 million as of December 31, 2024, to about 231.3 million as of September 30, 2025.
- Gossamer Bio has an option to acquire Respira Therapeutics Inc. through the potential issuance of 1.5 million shares of its common stock, representing less than 1% of outstanding shares.
Inbound Investments
- Gossamer Bio recognized $88.8 million in one-time license revenue during the second quarter of 2024, stemming from its collaboration with Chiesi.
- Revenue from the collaboration with Chiesi was $13.3 million for the third quarter ended September 30, 2025, and $11.5 million for the second quarter ended June 30, 2025, including cost reimbursement revenue.
Outbound Investments
- On September 24, 2025, Gossamer Bio entered into a strategic option agreement to acquire Respira Therapeutics Inc.
- The potential acquisition of Respira Therapeutics would involve the issuance of 1.5 million shares of Gossamer Bio common stock upon exercise of the option.
Capital Expenditures
- Capital expenditures for Gossamer Bio were reported as approximately $79,000 (negative outflow) in the last 12 months.
- Historically, capital expenditures were around $1.5 million in 2020, $1.55 million in 2021, and $0.41 million in 2022.
- The company expects its current cash, cash equivalents, and marketable securities to be sufficient to fund operating and capital expenditures into 2027.
