Exhibit 99.1 Climb Bio Reports First Quarter 2026 Financial Results and Provides Business Updates Robust B-cell depletion observed with budoprutug subcutaneous formulation in healthy volunteers, supporting continued development CLYM116 modeling and initial Phase 1 safety data to be presented at ERA 2026 with initial Phase 1 PK/PD data expected mid-2026 Budoprutug pMN, ITP, and SLE clinical trials enrolling to plan; anticipate data from all ongoing trials in 2026 Secured $110 million private placement led by ...