KT Corporation is Korea's largest integrated telecom company. Its core business is providing mobile and fixed-line connectivity services to consumers and businesses across Korea. Mobile services are KT's largest revenue line, with roughly 13.6 million direct subscribers and a 29% market share in a stable three-player oligopoly alongside SK Telecom and LG U+. KT also leases its network to MVNOs, adding roughly 8.4 million additional subscribers. On the fixed-line side, KT is Korea's dominant broadband provider with a 40% market share and a nationwide fiber optic network spanning roughly 968,000 km, giving it a structural cost advantage over competitors. KT also leads in IPTV through its Genie tv service, with roughly 9.5 million subscribers and a 43% market share. KT earns primarily recurring subscription revenue, with growth driven by subscriber additions, higher-tier plan adoption, and cross-selling through bundled mobile, broadband, and IPTV packages. Beyond core telecom, KT operates BC Card, Korea's largest merchant payment network by transaction volume, in which KT holds a roughly 70% stake. KT is also pushing into cloud and AI services through its kt cloud subsidiary, which grew revenue 27% in 2025 by expanding AI-capable data center capacity and targeting enterprise and government customers. KT is building out AI models and partnerships with Microsoft, Meta, and Palantir to position itself as an enterprise AI platform provider, though its core connectivity business remains the foundation of its revenue base.