NGNE - Earnings announcements

All participants experienced a 2-point improvement in the clinician-rated Clinical Global Impression-Improvement (CGI-I) scale from baseline All participants improved in the caregiver-completed Rett Syndrome Behavior Questionnaire (RSBQ), ranging from 28 to 52 percent improvement from baseline All participants with disruptions in sleep, constipation, and dysphagia at baseline demonstrated objective improvements Gains in skill and developmental milestones were consistent, durable, deepened over time and demonstrated improvements not expected based on natural history data Low-dose NGN-401 well-tolerated with favorable safety profile Company plans to provide an update of registration

Company to host webcast to review data on November 11 at 4:30 p.m. ET Late-breaker poster to be presented during Child Neurology Society Meeting on November 12 Neurogene Inc. (NASDAQ:NGNE), a clinical-stage company founded to bring life-changing genetic medicines to patients and families affected by rare neurological diseases, today announced that it will host a webcast to present interim efficacy data from the low-dose cohort of its ongoing Phase 1/2 clinical trial of NGN-401 gene therapy for pediatric patients with Rett syndrome on November 11, 2024 at 4:30 p.m. ET. Safety data from the low- and high-dose cohorts will also be shared. These data will also be presented in a late-breaking