Exhibit 99.1 Jade Biosciences Reports Second Quarter 2025 Financial Results and Provides Corporate Update San Francisco and Vancouver, British Columbia – August 13, 2025 – Jade Biosciences, Inc. ("Jade") (Nasdaq: JBIO), a biotechnology company focused on developing best-in-class therapies for autoimmune diseases, today announced financial results for the quarter ending June 30, 2025, and provided a corporate update. "We've had a productive second quarter, in which we closed our reverse merger and significan ...