J:COM

JCOM Co., Ltd.
Native name	JCOM株式会社
Romanized name	Jeikomu kabushiki-gaisha
Formerly	Jupiter Telecommunications Co., Ltd. (1995-2021)
Company type	Private
Traded as	TYO: 4817
Industry	Telecommunications; Mass media;
Headquarters	Marunouchi, Chiyoda, Tokyo, Japan
Owner	KDDI (50%); Sumitomo Corporation (50%);
Subsidiaries	Asmik Ace; J:COM BS; J Sports; Jupiter Golf Network [ja]; Warner Bros. Discovery Japan [ja] (minority stake);
Website	jcom.co.jp; jcom.co.jp/corporate;

J:COM Co., Ltd. is a Japanese company headquartered in Chiyoda, Tokyo, whose main operation is an MSO (multiple-system) cable operator in Sapporo, Sendai, Tokyo, Osaka and Fukuoka. It is a consolidated subsidiary of KDDI, and is a 50/50 joint venture with Sumitomo Corporation.

Previously known as Jupiter Communications, the company uses the brand name J:COM, and many of its subsidiaries have the J:COM name.

History

The company was created in December 1994 by Tele-Communications Inc., one of the largest MSOs in the world at the time. The company would initially offer cable systems and would later branch out to telephone services.^[1] The company expected to set up its telephony services by mid-1996, as well as trialing interactive television services.^[2] TCI, on its behalf, had problems with Japanese bureaucracy, as well as problems faced by smaller cable companies to provide digital services even after deregulation in 1993, enabling more foreign control.^[2] In 1999, it signed an agreement with @Home Internet to provide internet services for its subscribers.^[3]

Liberty Global sold its stake to KDDI in January 2010.^[4]

On December 1, 2023, it added Paramount+ to its services, alongside WOWOW.^[5] In June 2025, it took over satellite channel BS Shochiku Tokyu, saving it from closure, and renaming it J:COM BS.^[6]