ADP is one of the world's largest providers of Human Capital Management (HCM) software and services. At its core, ADP helps businesses pay their employees and manage HR needs — payroll is the foundation, with a broader suite of HR tools layered on top covering benefits administration, talent management, time and attendance, compliance, and retirement services. ADP serves over 1.1 million clients, pays over 42 million workers across 140+ countries, and processes roughly 1 in 6 U.S. paychecks. ADP operates two segments: Employer Services (ES), which serves businesses of all sizes and generates over 80% of revenue, and its Professional Employer Organization (PEO) business, ADP TotalSource, a co-employment arrangement for small and mid-sized businesses where ADP takes on employer responsibilities for payroll, benefits, and HR compliance. ADP's revenue is highly recurring, driven by client count, pricing, pays per control (which tracks the U.S. labor market), and float income earned on client funds held in transit — ADP moved over $3.3 trillion in FY25, generating roughly $1.19B in float income. ADP sells primarily through a direct salesforce, with indirect channels and embedded payroll partnerships (e.g., via Fiserv's Clover platform) playing a growing role in the small business market. ADP's growth strategy centers on next-gen AI-enabled platforms like ADP Lyric HCM for global enterprises, expanding HR outsourcing offerings, and growing its international footprint through organic investment and tuck-in acquisitions.