Exhibit 99.1 Alkermes Contacts: For Investors: Sandy Coombs +1 781 609 6377 For Media: Katie Joyce +1 781 249 8927 Alkermes plc Reports Second Quarter 2025 Financial Results — Second Quarter Revenues of $390.7 Million — — GAAP Net Income of$87.1 Million and Diluted GAAP Earnings per Share of $0.52 — — Company Reiterates 2025 Financial Expectations — — Alkermes to Present Detailed Vibrance-1 Results at Upcoming World Sleep Congress — DUBLIN, July 29, 2025 — Alkermes plc (Nasdaq: ALKS) today reported financi ...