Nippon Telegraph and Telephone Corporation, known as NTT, is Japan's largest telecommunications conglomerate and one of the world's largest telecommunications companies by revenue. The group operates through subsidiaries including NTT Docomo, Japan's largest mobile carrier, NTT East and NTT West for fixed-line and broadband services, and NTT Data for IT services and system integration. The Japanese government retains a significant ownership stake in NTT, reflecting its role in national communications infrastructure.

For international investors, Nippon Telegraph and Telephone — NTT — is Japan's dominant telecommunications and IT services group, operating fixed-line, broadband, and mobile networks domestically through NTT Docomo while also providing enterprise IT solutions and data center services globally. The company's NTT Ltd. international IT services business serves multinational corporations across major global markets, adding international revenue diversification beyond Japan's telecommunications infrastructure. NTT's scale, infrastructure ownership, and transformation toward global IT services represent the core of its long-term investment thesis.