\n\u201cWe are proud to be progressing through the final stages of the PROSERA Phase 3 Study. This is a pivotal moment for our team, and I am continually impressed by the focus, diligence, and professionalism that everyone brings to this important work. We look forward to sharing top-line results with the community in February of next year,\u201d said Faheem Hasnain, Chairman, Co-Founder, and CEO of Gossamer Bio.\n<\/p>\n
\n\u201cAt the same time, we are encouraged by the engagement from the PH-ILD community as we begin to activate the first clinical sites in the SERANATA Phase 3 study. We are grateful for the opportunity to collaborate closely with physicians and patients to better understand the challenges for those living with this challenging and under-treated disease. We are excited to begin enrollment, and we are hopeful that our collective efforts will ultimately improve the lives of patients living with PH-ILD.\u201d\n<\/p>\n
Seralutinib (GB002): Inhaled PDGFR, CSF1R and c-KIT Inhibitor<\/b><\/p>\n
Seralutinib: Pulmonary Arterial Hypertension<\/b><\/p>\n Seralutinib: Pulmonary Hypertension Associated with Interstitial Lung Disease<\/b><\/p>\n Vardenafil: Inhaled Phosphodiesterase Type 5 (PDE5) Inhibitor<\/b><\/p>\n Financial Results for Quarter Ended September 30, 2025<\/b><\/p>\n About Gossamer Bio<\/b><\/p>\n \nGossamer Bio is a late-stage, clinical biopharmaceutical company focused on the development and commercialization of seralutinib for the treatment of pulmonary arterial hypertension and pulmonary hypertension associated with interstitial lung disease. Its goal is to be an industry leader in, and to enhance the lives of patients living with, pulmonary hypertension.\n<\/p>\n Forward-Looking Statements<\/b><\/p>\n \nGossamer cautions you that statements contained in this press release regarding matters that are not historical facts are forward-looking statements. These statements are based on the Company\u2019s current beliefs and expectations. Such forward-looking statements include, but are not limited to, statements regarding: the anticipated timing of a data readout from our Phase 3 PROSERA Study; the potential or likelihood for a meaningful data readout from our PROSERA Study; the development potential and market opportunity of seralutinib in PAH, PH-ILD and other indications; the ability to successfully transition to a commercial organization, the anticipated timing on commencing the Phase 3 SERENATA study in PH-ILD and clinical work for inhaled vardenafil; the potential exercise of the option to acquire Respira, the related issuances of shares of Gossamer\u2019s common stock, and the timing thereof; and the expected timeframe for funding our operating plan with current cash, cash equivalents and marketable securities. The inclusion of forward-looking statements should not be regarded as a representation by Gossamer that any of its plans will be achieved. Actual results may differ from those set forth in this press release due to the risks and uncertainties inherent in Gossamer\u2019s business, including, without limitation: potential delays in the commencement, enrollment and completion of clinical trials; disruption to our operations from unexpected events, including clinical trial delays; the Company\u2019s dependence on third parties in connection with product manufacturing, research and preclinical and clinical testing; the results of preclinical studies and early clinical trials with seralutinib are not necessarily predictive of future results; the success of Gossamer\u2019s clinical trials and preclinical studies for seralutinib; regulatory developments in the United States and foreign countries; unexpected adverse side effects or inadequate efficacy of seralutinib that may limit its development, regulatory approval and\/or commercialization, or may result in clinical holds, recalls or product liability claims; Gossamer\u2019s ability to obtain and maintain intellectual property protection for seralutinib; Gossamer\u2019s ability to comply with its obligations in collaboration agreements with third parties or the agreements under which it licenses intellectual property rights from third parties; unstable market and economic conditions and adverse developments with respect to financial institutions and associated liquidity risk may adversely affect our business and financial condition and the broader economy and biotechnology industry; Gossamer may use its capital resources sooner than it expects; and other risks described in the Company\u2019s prior press releases and the Company\u2019s filings with the Securities and Exchange Commission (SEC), including under the heading \u201cRisk Factors\u201d in the Company\u2019s annual report on Form 10-K and any subsequent filings with the SEC. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and Gossamer undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement, which is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.\n<\/p>\n Gossamer Bio Statement of Operations<\/b><\/p>\n Condensed Consolidated Statement of Operations<\/b><\/p>\n (in thousands, except share and per share amounts)<\/b><\/p>\n (unaudited)<\/b><\/p>\n<\/td>\n<\/tr>\n \n\u00a0\n<\/p>\n<\/td>\n Three months ended September 30,<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n Nine months ended September 30,<\/b><\/p>\n<\/td>\n<\/tr>\n \n\u00a0\n<\/p>\n<\/td>\n 2025<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n 2024<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n 2025<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n 2024<\/b><\/p>\n<\/td>\n<\/tr>\n Revenue:<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nRevenue from sale of licenses\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n88,751\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nRevenue from contracts with collaborators\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n13,294\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n9,480\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n34,672\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n16,571\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n Total revenue<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n13,294\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n9,480\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n34,672\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n105,322\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n Operating expenses:<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nResearch and development\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n45,542\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n34,897\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n125,158\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n102,375\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nIn process research and development\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n7,476\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n7,476\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nGeneral and administrative\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n9,390\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n8,502\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n26,727\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n26,738\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nTotal operating expenses\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n62,408\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n43,399\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n159,361\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n129,113\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n Loss from operations<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (49,114<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (33,919<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (124,689<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (23,791<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n<\/tr>\n \nOther income (expense)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nInterest income\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n687\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n430\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n1,523\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n2,523\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nInterest expense\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n(2,748\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n(2,734\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n(8,238\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n(8,779\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n<\/tr>\n \nOther income, net\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n2,954\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n4,288\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n8,272\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n9,851\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n \nTotal other income, net\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n893\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n1,984\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n1,557\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n3,595\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n Loss before provision for income taxes<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (48,221<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (31,935<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (123,132<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n (20,196<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n<\/tr>\n \nProvision (benefit) for income taxes\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n(1,132\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u2014\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n3,303\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n Net Loss<\/b><\/p>\n<\/td>\n $<\/b><\/p>\n<\/td>\n (48,221<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n $<\/b><\/p>\n<\/td>\n (30,803<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n $<\/b><\/p>\n<\/td>\n (123,132<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n $<\/b><\/p>\n<\/td>\n (23,499<\/b><\/p>\n<\/td>\n )<\/b><\/p>\n<\/td>\n<\/tr>\n \nNet loss per share, basic and diluted\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n(0.21\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n(0.14\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n(0.54\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n$\n<\/p>\n<\/td>\n \n(0.10\n<\/p>\n<\/td>\n \n)\n<\/p>\n<\/td>\n<\/tr>\n \nWeighted average common shares outstanding, basic diluted\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n227,981,475\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n226,346,058\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n227,362,592\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n \n226,101,727\n<\/p>\n<\/td>\n \n\u00a0\n<\/p>\n<\/td>\n<\/tr>\n<\/table>\n\n
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\n \n \n \n \n \n \u00a0<\/td>\n<\/tr>\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n