Pfizer Ltd is a major drug manufacturing company that focuses on a global portfolio of medical products. The company works across developed and emerging markets to advance treatments through its to segments, Pfizer Innovative Health and Pfizer Essential Health. The vast majority of the company's revenue is derived from the manufacture and sale of biopharmaceutical products. Most of the company's sales are generated by its Innovative Health segment. While the company operates across a wide span of international markets, most of the company's revenue is generated in the United States.