Exhibit 99.1 Agios Reports Business Highlights and First Quarter 2024 Financial Results – Topline Data Readout from the Phase 3 ENERGIZE-T Study of Mitapivat in Adults with Transfusion- Dependent Alpha- or Beta-Thalassemia now expected in Q2 2024 – – Announced Positive Results from the Phase 3 ENERGIZE Study of Mitapivat in Adults with Non-Transfusion- Dependent Alpha- or Beta-Thalassemia in January – – Phase 3 Readouts from Mitapivat RISE UP Study in Sickle Cell Disease, ACTIVATE-KIDS and ACTIVATE KIDS-T i ...