**Sutro Biopharma Announces Corporate Restructuring to Extend Cash Runway** SOUTH SAN FRANCISCO, Calif., September 29, 2025 - Sutro Biopharma Inc. (NASDAQ: STRO), a biotechnology company specializing in antibody drug conjugates (ADCs) for cancer treatment, has announced a major organizational restructuring. The company will reduce its workforce by approximately one-third to focus resources on advancing its three key ADC programs and research collaborations. This move, combined with anticipated near-term milestone payments, is expected to extend the company's financial runway into at least mid-2027. Sutro plans to advance its next-generation Tissue Factor-targeting exatecan ADC, STRO-004, into clinical trials this year, with initial data expected in 2026. CEO Jane Chung said the changes will help the company reach critical development milestones and deliver value to patients and shareholders.