Rallybio Corporation, a clinical-stage biotechnology company, engages in development and commercialization of life-transforming therapies for patients suffering from severe and rare diseases. Its lead product candidate is RLYB212, a monoclonal anti-HPA-1a antibody that has completed Phase I clinical trial for the prevention of fetal and neonatal alloimmune thrombocytopenia (FNAIT); and RLYB211 for the prevention of FNAIT. The company is also developing RLYB114, a pegylated complement factor 5 (C5)-targeted Affibody molecule in preclinical development for the treatment of complement-mediated ophthalmic diseases; RLYB116, an inhibitor of complement component 5 (C5) to treat several diseases of complement dysregulation which has completed phase 1 trial; and RLYB331, a preclinical antibody, for the treatment of severe anemia with ineffective erythropoiesis and iron overload. It entered into a strategic alliance with AbCellera to discover, develop, and commercialize novel antibody-based therapeutics for rare diseases. Rallybio has collaboration with Exscientia for the development of small molecule therapeutics for rare diseases; and collaboration agreement with Johnson & Johnson to provide pregnant individuals therapeutic solutions at risk of fetal and neonatal alloimmune thrombocytopenia. The company was founded in 2018 and is headquartered in New Haven, Connecticut.