LeonaBio, Inc. is a clinical-stage biopharmaceutical company developing novel therapeutics for high unmet medical needs, including treatment-resistant metastatic breast cancer and amyotrophic lateral sclerosis. Its lead products are lasofoxifene and ATH-1105, small molecule therapies with the potential to address devastating diseases where current options are limited or ineffective. The pipeline includes ATH-1105 for amyotrophic lateral sclerosis (Phase 1), ATH-1020 for diabetic neuropathy (Phase 1), ATH-1017 for Alzheimer's and Parkinson's diseases (Phase 2), and preclinical compounds. The company was formerly known as Athira Pharma, Inc., changed its name to LeonaBio, Inc. in January 2026, was incorporated in 2011, and is headquartered in Bothell, Washington.