Enanta Pharmaceuticals to Present Topline Results from its Phase 2b Study Evaluating Zelicapavir for the Treatment of Respiratory Syncytial Virus (RSV) in High-Risk Adults

About this update from Enanta Pharmaceuticals, Inc.

WATERTOWN, Mass., September 26, 2025 --( BUSINESS WIRE )-- Enanta Pharmaceuticals, Inc. (NASDAQ:ENTA), a clinical-stage biotechnology company dedicated to creating small molecule drugs for viral infections and immunological diseases, today announced the company will hold a conference call and webcast on Monday, September 29 at 8:30 a.m. ET to share topline results from RSVHR, a Phase 2b study evaluating zelicapavir for the treatment of respiratory syncytial virus (RSV) in high-risk adults. Conference Call and Webcast Information The live webcast can be accessed at " Events & Presentations " in the investors section of Enanta’s website. To participate by phone, please register for the call here . It is recommended that participants register a day in advance or at a minimum of 15 minutes before the call. Once registered, participants will receive an email with the dial-in information. The archived webcast will be available on Enanta’s website for approximately 30 days following the event. About Enanta Pharmaceuticals, Inc. Enanta is using its robust, chemistry-driven approach and drug discovery capabilities to become a leader in the discovery and development of small molecule drugs with an emphasis on indications in virology and immunology. Enanta’s clinical programs are currently focused on respiratory syncytial virus (RSV) and its earlier-stage immunology pipeline aims to develop treatments for inflammatory diseases by targeting key drivers of the type 2 immune response, including KIT and STAT6 inhibition. Glecaprevir, a protease inhibitor discovered by Enanta, is part of one of the leading treatment regimens for curing chronic and acute hepatitis C virus (HCV) infection and is sold by AbbVie in numerous countries under the tradenames MAVYRET ® (U.S.) and MAVIRET ® (ex-U.S.) (glecaprevir/pibrentasvir). A portion of Enanta’s royalties from HCV products developed under its collaboration with AbbVie contribute ongoing funding to Enanta’s operations. Please visit www.enanta.com for more information. View source version on businesswire.com: https://www.businesswire.com/news/home/20250926821731/en/ Contacts Media and Investors Contact: Jennifer Viera 617-744-3848 [email protected]

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