CSG Systems is a SaaS software company that provides billing, revenue management, customer engagement, and payments solutions. CSG's roots are in telecom and cable, where it serves as the core billing and subscriber management backbone for major communications service providers, including Charter and Comcast, which together represent roughly 36% of revenue. CSG organizes its business into three areas: Revenue Management and Digital Monetization (its core telecom billing business, including the Ascendon cloud-native billing platform and a configure-price-quote solution for complex B2B order management); Transformational Customer Experiences, centered on CSG Xponent, a customer journey analytics and orchestration platform; and Payments, which serves roughly 163,000 active merchants with a cloud-based platform supporting ACH, cards, and digital wallets. CSG earns revenue primarily through long-term recurring SaaS and managed services contracts, and management notes that CSG typically enters each year with over 90% revenue visibility. Because CSG's systems are mission-critical — managing the full lifecycle from billing to payment collection — customers tend to stay for decades, creating high switching costs. CSG is gradually diversifying beyond telecom into financial services, healthcare, insurance, retail, and government, targeting non-CSP verticals for more than 35% of revenue by end of 2026. CSG is in the process of being acquired by NEC for $80.70 per share in cash, with the deal expected to close in 2026.