Exhibit 99.1 Rigel Reports First Quarter 2025 Financial Results and Provides Business Update SOUTH SAN FRANCISCO, Calif., May 6, 2025 /PRNewswire/ -- Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL), a commercial stage biotechnology company focused on hematologic disorders and cancer, today reported financial results for the first quarter ended March 31, 2025, including sales of TAVALISSE (fostamatinib disodium hexahydrate), GAVRETO (pralsetinib) and REZLIDHIA (olutasidenib), and recent business progress. · Net p ...