Exhibit 99.1 Agenus Reports Q1 2025 Financial Results and Key Business Updates May 12, 2025 LEXINGTON, Mass.--(BUSINESS WIRE)-- Agenus Inc. ("Agenus" or the "Company") (NASDAQ: AGEN), a leader in immuno-oncology, today reported financial and operational results for the first quarter of 2025, and shared key clinical and strategic milestones supporting the advancement of its botensilimab (BOT) and balstilimab (BAL) program. "The growing strength of our BOT/BAL data across multiple hard-to-treat cancers reinfo ...