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Leidos Holdings, Inc. (LDOS) is a technology and engineering firm specializing in national security, defense, health, and civil markets. Headquartered in Reston, Virginia, Leidos provides scientific, systems-integration, IT, and technical services to government and commercial clients. Its market capitalization stands at around $23.8 billion.
Shares of the defense contractor have outperformed the broader market. LDOS stock has gained 13.2% over the past 52 weeks and 29.5% on a year-to-date (YTD) basis, compared to the S&P 500 Index’s ($SPX) 11% gains over the past year and 12.3% uptick in 2025.