Florida Trend’s list of the 350 biggest companies in Florida includes two privately-held and four Volusia County firms: NASCAR, ICI Homes, Brown & Brown, TopBuild Corp., International Speedway Corp. and Consolidated-Tomoka Land Company. Sparton Corporation's sonobuoy manufacturing facility is located in DeLeon Springs here in Volusia County. Teledyne Oil and Gas, the world leader in subsea electrical and fiber optic interconnect systems for offshore oil and gas, defense, oceanographic and telecommunication applications is based in Daytona Beach, and Hawaiian Tropic sun care products are manufactured in Ormond Beach. Boston Whaler, Edgewater Power Boats and Everglades Boats are all based in Edgewater. Raydon, one of the world’s leading developers of simulation training products and solutions is headquartered in Port Orange. DaVita Labs and Medtronic, a global healthcare products company, are located in DeLand. Frontier Communications and Sykes Enterprises have contact centers in DeLand, which is also home to some of the world’s leading parachute manufacturers and the U. S. headquarters of Kingspan.