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