Rallybio Corporation, a clinical-stage biotechnology company, engages in discovering, developing, manufacturing, and delivering therapies that enhance the lives of patients suffering from severe and rare diseases. Its lead product candidate is RLYB212, a preclinical-stage monoclonal anti-HPA-1a antibody for the prevention of fetal and neonatal alloimmune thrombocytopenia (FNAIT). The company is also developing RLYB211, a polyclonal anti-HPA-1a antibody that is in a Phase 1/2 clinical trial for the prevention of FNAIT; RLYB114, a pegylated C5 inhibitor in preclinical development for the treatment of complement-mediated ophthalmic diseases; and RLYB116, a subcutaneously administered inhibitor of complement factor 5, or C5, for the treatment of patients with paroxysmal nocturnal hemoglobinuria and generalized myasthenia gravis. The company also has discovery-stage programs that are focused on the identification of small molecule therapeutics for patients with rare metabolic diseases. Rallybio has collaboration with Exscientia for the development of small molecule therapeutics for rare diseases. Rallybio Corporation was incorporated in 2018 and is headquartered in New Haven, Connecticut. Rallybio Corporation operates as a subsidiary of Rallybio Holdings, LLC.