KDDI

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KDDI Corporation

Headquarters in Iidabashi, Chiyoda, Tokyo
Native name	KDDI株式会社
Romanized name	Keidīdīai kabushiki gaisha
Company type	Public KK
Traded as	TYO: 9433 TOPIX Core 30 Component
Industry	Telecommunications
Founded	1953; 71 years ago (1953) (establishment of Kokusai Denshin Denwa or KDD as a state-owned enterprise)[1][2]
Founder	Government of Japan (for the KDD branch) Kazuo Inamori (for the DDI branch)
Headquarters	Chiyoda, Tokyo, Japan
Key people	Takashi Tanaka(businessman) [jp], CEO Makoto Takahashi(businessman) [jp], President & CEO
Products	Fixed line and mobile telephony, Internet services, digital television
Revenue	JP¥ 5.24 trillion (2020)[3]
Net income	JP¥ 639.77 billion (2020)[3]
Number of employees	44,952 (2020)[3]
Subsidiaries	List Okinawa Cellular Telephone Company (53.9%) JCOM (50%) UQ Communications (32.3%) BIGLOBE Aeon Holdings Chubu Telecommunications Wire and Wireless Telasa (50%) au Financial Holdings Supership Holdings au Energy Holdings KDDI Matomete Office KDDI Digital Divergence Holdings KDDI Engineering KDDI Research KDDI Cableships & Subsea Engineering Japan Telecommunication Engineering Service KDDI America KDDI China KDDI Asia Pacific Telehouse Holdings Kyocera Communication System (23.4%) Mobaoku (33.4%) Kakaku.com (17.4%) Lac (32.4%)
Website	www.kddi.com

KDDI Corporation (KDDI株式会社, KDDI Kabushiki Gaisha) (TYO: 9433) is a Japanese telecommunications operator. It was established in 2000 through the merger of DDI (第二電電, Daini Denden), KDD (ケイディディ), and IDO (日本移動通信, Nippon Idō Tsūshin). In 2001, it merged with a subsidiary named Au, which was formed through the merger of seven automotive and mobile phone companies from the DDI-Cellular Group. As of 2020, it is the second-largest mobile telecommunications provider in Japan in terms of the number of contracts, following NTT Docomo.

KDDI provides mobile cellular services using the Au brand. ISP network services are provided under the au one net brand, while "au Hikari" is the name under which long-distance and international voice and data communications services and Fiber to the Home (FTTH) services are marketed. ADSL broadband services carry the brand name "ADSL One", and IP telephony over copper is branded as "Metal Plus".