Exhibit 99.1 Rhythm Pharmaceuticals Reports Second Quarter 2025 Financial Results and Business Update -- Second quarter 2025 net product revenue from global sales of IMCIVREE® (setmelanotide) of $48.5 million -- -- U.S. and EU regulatory submissions for setmelanotide in acquired hypothalamic obesity on track to be completed in the third quarter of 2025 -- -- Bivamelagon Phase 2 trial met primary endpoint with statistically significant, clinically meaningful BMI reductions in patients with acquired hypothala ...