Exhibit 99.1 Foghorn Therapeutics Provides First Quarter 2025 Financial and Corporate Update FHD-909 (LY4050784) advancing in Phase 1 dose escalation trial in SMARCA4 (BRG1) mutated cancers, with non-small cell lung cancer (NSCLC) as the primary target population Data presented at AACR show synergistic activity with FHD-909 in combination with pembrolizumab and KRAS inhibitors and support clinical exploration Selective CBP degrader on track for IND-enabling studies, targeting IND in 2026 Continued progress ...