WAKIX® (pitolisant) Net Revenue Increased ~25% Year-over-Year to $134.2 Million for Second Quarter 2023 Average Number of Patients on WAKIX Increased by ~350 Sequentially to ~5,450 for Second Quarter 2023 Exited Second Quarter 2023 With ~5,600 Patients on WAKIX Completed Enrollment in Phase 3 Idiopathic Hypersomnia (IH) INTUNE Study; On-track for Topline Data in Fourth Quarter 2023 Plans to Initiate Prader-Willi Syndrome (PWS) Phase 3 Study in Fourth Quarter 2023 Board of Directors Authorized $1