Exhibit 99.1 News Release Puma Biotechnology Reports Third Quarter 2026 Financial Results - Third quarter U.S. NERLYNX sales driven by increased year-over-year demand - Raising 2026 net income guidance LOS ANGELES, Calif., Nov. 5, 2026 - Puma Biotechnology, Inc. (NASDAQ: PBYI), a biopharmaceutical company, announced financial results for the third quarter ended September 30, 2026. Unless otherwise stated, all comparisons are for the third quarter of 2026 compared to the third quarter of 2025. Product revenu ...