Exhibit 99.1 Allakos Provides Business Update and Reports First Quarter 2024 Financial Results SAN CARLOS, Calif., May 9, 2024 (GLOBE NEWSWIRE) – Allakos Inc. (the “Company”) (Nasdaq: ALLK), a biotechnology company developing antibodies for the treatment of allergic, inflammatory and proliferative diseases, today provided a business update and reported financial results for the first quarter ended March 31, 2024. Recent Allakos Events • Completed dosing in the single ascending dose (SAD) cohorts and multipl ...