Exhibit 99.1 Akebia Therapeutics Reports First Quarter 2024 Financial Results and Recent Business Highlights Akebia to host conference call at 8:00 a.m. ET on May 9 • Vafseo® (vadadustat) tablets FDA approved on March 27, 2024 • Vafseo launch activities underway with availability expected in January 2025 • Auryxia® (ferric citrate) net product revenues were $31.0 million for the first quarter 2024, Akebia expects 2024 Auryxia net product revenue growth versus 2023 CAMBRIDGE, Mass.—May 9, 2024—Akebia Therape ...