Chesapeake Utilities Corporation is a publicly held American energy services company focusing on distribution of natural gas and propane in Delaware, Maryland and Florida. The corporate headquarters are located in Dover, Delaware. In Delaware, the company operates the only natural gas distribution system in Kent and Sussex Counties. The company serves all consumer types in Delaware and Maryland, but markets primarily to commercial and industrial customers in Florida, where it operates as Peninsula Energy Services Company, Inc. (PESCO). The Dover Gas and Light Company was formed in 1859. This company was incorporated in Delaware in 1947 as Chesapeake Utilities Corporation and has made at least thirteen corporate acquisitions since that time. Trading of common stock on the NASDAQ Exchange (formerly traded as CHPK) began in 1985 and on the New York Stock Exchange (currently traded as CPK) in 1993. The company is involved in a number of other businesses through wholly owned subsidiaries. The subsidiary Eastern Shore Natural Gas Company conducts natural gas transmission operations in Pennsylvania and Delaware, while subsidiaries Sharp Energy and Xeron are involved in propane distribution to all customer types.