Upstream Bio, Inc. UPB

– Verekitug, 100 mg dosed every 12 weeks, reduced AAER by 56% compared to placebo in patients with severe asthma – – Verekitug also delivered clinically meaningful improvements in lung function (FEV1) and exhaled nitric oxide (FeNO) with every 12-week dosing – – The Company remains on track to initiate Phase 3 trials in severe asthma and CRSwNP in Q1 2027, designed to deliver best-in-class efficacy in both indications by evaluating a 400 mg quarterly regimen of verekitug in broad patient populat

Upstream Bio (UPB) is on track to initiate Phase 3 clinical trials of verekitug in severe asthma and

– Following productive FDA discussions, Upstream Bio will study 400 mg of verekitug administered every 12 weeks, versus placebo, in severe asthma and CRSwNP with one pivotal Phase 3 trial in each indication – – The Company’s Phase 3 strategy is designed to deliver best-in-class efficacy across both indications by evaluating a high-dose, quarterly regimen of verekitug in broad patient populations – – The Company remains on track to initiate both Phase 3 trials in Q1 2027 – WALTHAM, Mass., Sept. 0

– Company rapidly advancing toward Q1 2027 initiation of Phase 3 trials designed to deliver best-in-class efficacy with convenient quarterly dosing in both severe asthma and CRSwNP; End-of-Phase 2 interactions with FDA on track – – Completed enrollment in Phase 2 trial in COPD; data expected in the second half of 2027 – – Clinical data presentations continue to emphasize differentiated profile of verekitug in multiple indications – WALTHAM, Mass., Aug. 11, 2026 (GLOBE NEWSWIRE) -- Upstream Bio,

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– Verekitug, administered once every three months, led to clinically meaningful improvements in nasal polyp score (NPS) in approximately 80% of participants – – Majority of verekitug-treated participants experienced clinically meaningful improvements across key secondary endpoints, including 72% in nasal congestion and 83% in CRSwNP total symptom score – WALTHAM, Mass., June 14, 2026 (GLOBE NEWSWIRE) -- Upstream Bio, Inc. (Nasdaq: UPB), a clinical-stage company developing treatments for inflamma

WALTHAM, Mass., June 03, 2026 (GLOBE NEWSWIRE) -- Upstream Bio, Inc. (Nasdaq: UPB), a clinical-stage company developing treatments for inflammatory diseases, with an initial focus on severe respiratory disorders, today announced that Rand Sutherland, MD, Chief Executive Officer of Upstream Bio, will participate in a fireside chat at the Goldman Sachs 47th Annual Global Healthcare Conference on Wednesday, June 10, 2026, at 10:40 a.m. ET. A live webcast of the presentation will be available under

– Verekitug led to statistically significant and clinically meaningful improvement in asthma symptom control as measured by the Asthma Control Questionnaire-6 (ACQ-6) in participants with CRSwNP and comorbid asthma – – Verekitug led to improvements in nasal polyp score (NPS) in participants with and without comorbid asthma, as well as rapid and sustained reductions in blood and nasal type 2 inflammatory biomarkers – WALTHAM, Mass., May 18, 2026 (GLOBE NEWSWIRE) -- Upstream Bio, Inc. (Nasdaq: UPB

– Company rapidly advancing Phase 3 programs designed to deliver best-in-class efficacy with convenient quarterly dosing in severe asthma and CRSwNP – – End-of-Phase 2 meetings with FDA planned for mid-2026; Phase 3 initiations in both indications expected in Q1 2027 – – Phase 2 VENTURE trial in COPD ongoing; Company to cap further enrollment; data now expected in the second half of 2027 – – Upcoming data presentations at ATS and EAACI to further elaborate the clinical profile of verekitug – WAL

WALTHAM, Mass., April 17, 2026 (GLOBE NEWSWIRE) -- Upstream Bio, Inc. (Nasdaq: UPB), a clinical-stage company developing treatments for inflammatory diseases, with an initial focus on severe respiratory disorders, today announced two upcoming poster presentations at the American Thoracic Society (ATS) 2026 International Conference in Orlando, FL, on Monday, May 18, 2026. The presentations feature new data from the Phase 2 VIBRANT trial evaluating verekitug, the only known antagonist to the thymi

– Company to pursue Phase 3 development strategy designed to deliver best-in-class efficacy with a high-dose quarterly regimen in broad patient populations in both severe asthma and CRSwNP – – Company plans to initiate dosing in Phase 3 trials in both severe asthma and CRSwNP in Q1 2027 – – Reported positive top-line results from Phase 2 VALIANT trial of verekitug in patients with severe asthma in February 2026, demonstrating significant improvements in asthma exacerbations and lung function – –

– Primary endpoint of endoscopic nasal polyp score (NPS) showed reduction of -1.95 (p < 0.0001) in new analysis with adjustment for concomitant rescue therapy use – – Secondary endpoints also provided strong efficacy data in new analyses, including reduction in nasal congestion score (NCS) by -0.96 (p < 0.0001) – WALTHAM, Mass., March 01, 2026 (GLOBE NEWSWIRE) -- Upstream Bio, Inc. (Nasdaq:UPB), a clinical-stage company developing treatments for inflammatory diseases, with an initial focus on se