Vir Biotechnology Announces AASLD The Liver Meeting® Presentation & New England Journal of Medicine Publication of Phase 2 Data Demonstrating Tobevibart & Elebsiran Combination Deliver High Rates of Undetectable HDV RNA with Favorable Safety Profile

• SOLSTICE trial data demonstrate that 66% of chronic hepatitis delta participants receiving a monthly dose of tobevibart and elebsiran achieved undetectable HDV RNA at Week 48
• Combination well-tolerated: No grade 3 or higher treatment-related adverse events and no treatment-related discontinuations
• ECLIPSE registrational program evaluating the combination of tobevibart and elebsiran for chronic hepatitis delta fully underway, with topline data expected in the first quarter of 2027
• Data presented at AASLD The Liver Meeting® and simultaneously published in the New England Journal of Medicine

SAN FRANCISCO--(BUSINESS WIRE)-- Vir Biotechnology, Inc. (Nasdaq: VIR) today announced that Week 48 endpoint analysis from the Company’s Phase 2 SOLSTICE trial for chronic hepatitis delta (CHD) demonstrated that participants receiving a monthly dose of the combination of tobevibart and elebsiran achieved robust and sustained rates of hepatitis delta virus (HDV) RNA target not detected (TND), including those participants with cirrhosis and high baseline HDV RNA. The combination also showed alanine aminotransferase (ALT) reductions over time and a favorable safety profile. These data were presented in an oral session at the American Association for the Study of Liver Diseases (AASLD) The Liver Meeting ®, in Washington, D.C., and simultaneously published in the New England Journal of Medicine.

“Achieving undetectable HDV RNA is a key endpoint in clinical trials, and HDV RNA undetectability is associated with better outcomes for people living with chronic hepatitis delta,” said Tarik Asselah, M.D., Ph.D., Professor of Hepatology at the Hôpital Beaujon, APHP, Clichy, France, and at the University of Paris-Cité, and Head of the unit Viral Hepatitis UMR1149 at INSERM, France. “The combination of tobevibart and elebsiran has consistently demonstrated impressive hepatitis delta virologic suppression in the SOLSTICE Phase 2 trial, and these 48-week data are encouraging as they continue to support its potential to deliver meaningful patient benefit.”

Data demonstrate that 66% (21/32) of participants with CHD receiving a monthly dose of the combination of tobevibart and elebsiran achieved and sustained HDV RNA TND at 48 weeks. Additionally, approximately 90% of participants achieved reduction in hepatitis B surface antigen (HBsAg) to values