Leidos vs Paychex
Side-by-side comparison of AI visibility scores, market position, and capabilities
Reston VA defense intelligence and government IT (NYSE: LDOS) $16.7B FY2024 revenue (+8%); NSA/DoD classified IT, VA EHRM $10B+ EHR modernization, Smiths Detection, competing with SAIC and Booz Allen.
About
Leidos Holdings, Inc. is a Reston, Virginia-based defense, intelligence, and civil government IT services company — publicly traded on the New York Stock Exchange (NYSE: LDOS) as an S&P 500 Industrials component — providing national security solutions (IT services for US intelligence community, Department of Defense analytics, cybersecurity), health and civil government services (VA electronic health records, HHS IT systems, FAA air traffic control modernization), and commercial services through approximately 47,000 employees. In fiscal year 2024, Leidos reported revenues of $16.7 billion (+8% year-over-year), with the National Security & Digital segment generating the majority of revenue from classified intelligence community IT programs and Department of Defense cybersecurity and analytics contracts, while Health & Civil generated revenue from the Leidos Digital Modernization contract for the Department of Veterans Affairs electronic health records (replacing VistA legacy EHR with Oracle Cerner's Millennium platform) — a 10-year, $10+ billion program that was simultaneously Leidos's largest contract and largest program execution challenge. CEO Tom Bell (joined 2023, previously from Rolls-Royce North America) has focused Leidos on transitioning from IT services to technology-enabled solutions: augmenting traditional government IT labor with proprietary software products (Leidos AI/ML platforms, cloud migration tools, cybersecurity automation) that generate higher margins than staff augmentation. The $1.65 billion acquisition of the security detection and automation business of Smiths Group (X-ray security screening equipment — baggage scanners for TSA checkpoints) in 2021 expanded Leidos into physical security hardware and detection systems for government and commercial airports.
Rochester NY HCM and payroll platform (NASDAQ: PAYX) at $5.5B+ FY2025 revenue; $4.1B Paycor HCM acquisition (April 2025) adding 49,000 clients competing with ADP for US small and mid-market HR platform.
About
Paychex, Inc. is a Rochester, New York-based human capital management (HCM) and payroll company — publicly traded on NASDAQ (NASDAQ: PAYX) as an S&P 500 component — serving nearly 800,000 clients across the United States and Europe with payroll processing, HR technology, employee benefits administration, retirement services, insurance services, and PEO/ASO solutions through the Paychex Flex cloud platform. In fiscal year 2025, Paychex reported annual revenue exceeding $5.5 billion with more than 16,000 employees. In April 2025, Paychex completed the acquisition of Paycor HCM for approximately $4.1 billion — the largest acquisition in Paychex history — adding 2,900 employees, 49,000 clients, and HCM capabilities for 2.7 million employees, significantly expanding Paychex's presence in the mid-market and enterprise segments. AI-powered Paychex Recruiting CoPilot and HR analytics tools reflect Paychex's technology investment. Founded in 1971 by Tom Golisano in Rochester with $3,000 in initial capital, Paychex pioneered affordable payroll outsourcing for small businesses.
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