Pfizer Inc. is an American multinational pharmaceutical and biotechnology corporation headquartered on 42nd Street in Manhattan, New York City. The company was established in 1849 in New York by two German entrepreneurs, Charles Pfizer and his cousin Charles F. Erhart. Pfizer develops and produces medicines and vaccines for immunology, oncology, cardiology, endocrinology, and neurology. The company has several blockbuster drugs or products that each generate more than US$1 billion in annual revenues. In 2020, 52% of the company's revenues came from the United States, 6% came from each of China and Japan, and 36% came from other countries. Pfizer was a component of the Dow Jones Industrial Average stock market index from 2004 to August 2020. The company ranks 64th on the Fortune 500 and 49th on the Forbes Global 2000.

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