United Therapeutics Corporation
A maker of medicines for rare lung conditions such as pulmonary arterial hypertension, sold under brands like Remodulin and Tyvaso. Founder Martine Rothblatt launched the company in 1996 after her young daughter was diagnosed with the disease, turning a personal fight into a career. The firm is also known for a futuristic goal: gene-edited pig organs for human transplants, an approach that has made it a familiar name in xenotransplantation.