- Company founded as Standard Games (later Service Games) in Honolulu, Hawaii, by Martin Bromely, Irving Bromberg, and James Humpert to provide coin-operated amusements for American servicemen on military bases.
- The company moves to Tokyo, Japan.
- The name "SErvice GAmes of Japan" is registered.
- Rosen Enterprises, Inc. and Service Games merge in 1965 to become Sega Enterprises.
- The company is purchased by Gulf and Western Industries.
- The company releases its first video game console: the SG-1000 and also the first laserdisc game.
- The company is bought by CSK and renamed Sega Enterprises Ltd., headquartered it in Japan.
- Hit by the video game crash of 1983, Gulf & Western sells the U.S. assets of Sega to Bally Manufacturing Corporation. The Japanese assets of Sega were purchased for $38 million by a group of investors led by David Rosen and Hayao Nakayama. Rosen became the head of the American subsidiary in the United States and Nakayama became the new CEO.
- SEGA of America, Inc. is established.
- All the R&D Divisions are separated from the main company and established as semi-autonomous subsidiaries.
- The company name is changed from SEGA Enterprises Ltd. to SEGA Corporation.
- The company discontinues the Dreamcast and ends its run as a video game hardware manufacturer.
- After discussions with Namco, Electronic Arts and Microsoft, the outstanding shares are bought by Sammy Corporation.
- Sammy Corporation buys a controlling share in Sega Corporation at a cost of $1.1 billion, and from the merger Sega Sammy Holdings Inc. is created.
Jan 25, 2005:
- The company sells its second-party developer Visual Concepts, along with its wholly-owned subsidiary Kush Games, to Take Two Interactive for $24 million.
Dec 31, 2014:
- SEGA Corporation absorbs SEGA Networks Co., Ltd..
Apr 01, 2015:
- SEGA Corporation changes its name to SEGA Games Co,, Ltd.