Reston, Virginia-based Leidos Holdings, Inc. (LDOS) operates as an IT services company, serving defense, intelligence, civil, and health markets. With a market cap of 23.4 billion, the company provides solutions related to cybersecurity, data analytics, operations & logistics, software development, and more. Companies worth 10 billion or more are generally described as "large-cap stocks." Leidos Holdings fits right into that category, with its market cap exceeding this threshold, reflecting its substant ...