Philadelphia is the largest city in Pennsylvania and the sixth-most-populous city in the United States. Philadelphia's economic sectors include manufacturing, oil refining, food processing, health care and biotechnology, tourism and financial services.. The city is home to the Philadelphia Stock Exchange and several Fortune 500 companies, including cable television and internet provider Comcast, insurance companies Colonial Penn, CIGNA and Lincoln Financial Group, energy company Sunoco, food services company Aramark and Crown Holdings Incorporated, chemical makers Rohm and Haas Company and FMC Corporation, pharmaceutical companies Wyeth and GlaxoSmithKline, Boeing Rotorcraft Systems, and automotive parts retailer Pep Boys. Early in the 20th Century, it was also home to the pioneering brass era automobile company Biddle.
