Tyco Integrated Security
Tyco Integrated Security, a business unit of Tyco International, is a company specializing in electronic security products, installation and services. The company's principal place of business in the US is Boca Raton, Florida; and Mississauga Ontario in Canada with over 10,000 employees and nearly 200 offices throughout North America. Corporate history. Tyco Integrated Security has roots in the beginning of the North American commercial security industry. In 1874, 57 district telegraph delivery companies affiliated and became "American District Telegraph" which became known as ADT. In July 1997, Tyco merged by reverse takeover with a smaller publicly  traded security services company named ADT Limited. Upon consummation of the merger, Tyco International Ltd. of Massachusetts became a wholly owned subsidiary of ADT Limited, and simultaneously ADT changed its name to Tyco International Ltd., retaining the former Tyco stock symbol, TYC. A new subsidiary named ADT Security Services was also formed out of the merger. In September 2011 Tyco International, Ltd., directors announced plans to split into three companies. Executive leadership. Mark VanDover - President