Leidos (formerly known as Science Applications International Corporation (SAIC)) is a leading US systems integrator, providing solutions and services relating to information technology, engineering, and science. The company is working to solve the world’s toughest challenges in its four key lines of business: civil, defense, health, and intelligence. It was founded in 1969 and has headquarters in Virginia. Leidos is one of the largest IT services providers within the defence industry after merging with aerospace giant Lockheed Martin in 2016. It has several wholly and majority-owned subsidiaries, including Dynetics, Gibbs & Cox, QTC, Varec, and 1901 Group. Together with its subsidiaries, the business serves the US Department of Defence and Homeland Security, as well as the National Security Agency (NSA). Leidos stock is listed on the New York Stock Exchange and is a constituent of the S&P 500 index. Start spread betting or trading CFDs on our Leidos share price.