| 1960 |
- Nihon Goraku Bussan Co., Ltd. established
- SEGA 1000, Japan's first domestically-made jukebox, produced
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| 1964 |
- Merged with Nihon Kikai Seizo Co., Ltd.
- Commercial arcade machine production enterprise begins
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| 1965 |
- Merged with Rosen Enterprises, Ltd.
- Commercial arcade operations begin
- Name changed to SEGA Enterprises, Ltd.
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| 1966 |
- "Periscope" becomes a hit worldwide
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| 1969 |
- Becomes a subsidiary of American conglomerate, Gulf and Western Industries, Inc.
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| 1971 |
- Released "WINNER", the first pinball machine made in Japan.
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| 1983 |
- 8-bit home video game console, "SG-1000", released
- Released the first-in-Japan Laser Disc game "ASTRON BELT".
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| 1984 |
- SEGA becomes a subsidiary of the CSK Group after its Japanese assets are purchased
- SEGA Europe, Ltd. established to market commercial arcade machines to Europe
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| 1985 |
- SEGA Enterprises, Inc. (USA) established to market commercial arcade machines to America
- World's first motion simulator game, "Hang-On", released
- "UFO Catcher" claw machine released for commercial arcades
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| 1986 |
- SEGA of America, Inc. established to market consoles to America
- Listed as a major security
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| 1988 |
- Listed in the Second Section of the Tokyo Stock Exchange
- 16-bit home video game console, "Mega Drive (Sega Genesis)", released
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| 1990 |
- Listed in the First Section of the Tokyo Stock Exchange
- World's first 360-degree, spinning arcade machine, "R360", released
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| 1991 |
- "Sonic the Hedgehog" series first debuts
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| 1992 |
- 3D polygonal arcade game, "Virtua Racing", released
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| 1993 |
- World's first 3DCG fighting game, "Virtua Fighter", makes its debut
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| 1994 |
- The toy business company ESPAL Co., Ltd. was acquired by SEGA ENTERPRISES LTD., and changed its name to Sega-Yonezawa Co., Ltd.
- 32-bit home video game console, "Sega Saturn", released
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| 1995 |
- SEGA Logistics Service Co., Ltd. established to specialize in distribution
- SEGA/ATLUS' "Print Club (Purikura)®" makes its debut
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| 1996 |
- "Tokyo Joypolis" opens near Tokyo
- "Sakura Taisen (Sakura Wars)" series first debuts on consoles
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| 1998 |
- Transferred TOY Business of SEGA ENTERPRISES LTD. to Sega-Yonezawa Co., Ltd., and changed its name to SEGA Toys Co., Ltd.
- "Dreamcast" home video game console released
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| 1999 |
- Launched first title in the Derby Owners Club series of amusement arcade game machines.
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| 2000 |
- Name changed to SEGA Corporation
- First console-based online RPG, "Phantasy Star Online", released
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| 2002 |
- "Bee SHIBUYA" opens as the company's first darts bar
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| 2003 |
- Establishment of DARTSLIVE Co., Ltd.
- First card game marketed towards children, "Mushiking: The King of Beetles", makes its debut
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| 2004 |
- SEGA and SAMMY join to establish SEGA SAMMY HOLDINGS INC.
- ALL.Net networking system established
- Arcade card game marketed towards girls, "Love and Berry: Dress Up and Dance!", makes its debut
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| 2005 |
- Purchase of American game developer, Creative Assembly
- "Ryu Ga Gotoku (Yakuza)" series first debuts on consoles
- "Sangokushi Taisen (Three Kingdoms)" TCG first appears in arcades
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| 2006 |
- Purchase of American game developer, Sports Interactive
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| 2007 |
- "Mario & Sonic at the Olympic Games™ (Beijing 2008)" debuts on consoles
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| 2009 |
- Establishment of SEGA SAMMY VISUAL ENTERTAINMENT INC. (Currently MARZA ANIMATION PLANET INC.)
- "Border Break" first appears in arcades
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| 2010 |
- Made SEGA TOYS CO., LTD., and TMS ENTERTAINMENT CO., LTD. into subsidiaries. (SEGA SAMMY HOLDINGS)
- "Kingdom Conquest" launched for iOS
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| 2012 |
- SEGA Networks Co., Ltd. established
- SEGA Entertainment, Inc. established
- Online RPG, "Phantasy Star Online 2", launched
- Arcade music game "maimai" begins operating
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| 2013 |
- ATLUS. CO., LTD., known for the "Shin Megami Tensei" and "Persona" series, joins SEGA Group.
- "Puyopuyo!! Quest" launched for smart devices
- "Chain Chronicle" launched for smart devices
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| 2015 |
- Reorganized the Group through an incorporation-type demerger, which designated SEGA CORPORATION as transferor and established SEGA Holdings Co., Ltd., SEGA Interactive Co., Ltd.
- Changed SEGA CORPORATION's name to SEGA Games Co., Ltd., after merging SEGA CORPORATION with SEGA Networks Co., Ltd.
- Made SEGA TOYS CO., LTD., TMS ENTERTAINMENT CO., LTD., and MARZA ANIMATION PLANET INC. into subsidiaries. (SEGA Holdings)
- Medieval fantasy RPG, "Hortensia Saga: Ao no Kishidan", launched
- Arcade music game "CHUNITHM" begins operating
- "goPlay" released as a global publishing support service for games on smart devices
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| 2016 |
- SEGA joins with Lancers, Inc. to establish digital marketing company, XD CO., LTD (Currently SEGA XD CO., LTD).
- "KanColle Arcade" begins operating
- Original "Sonic the Hedgehog" game inducted into The Strong museum Hall of Fame in the US
- Became the first Japanese console maker to sell directly in the Taiwanese market
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| 2018 |
- All SEGA-SAMMY Group assets moved to the Osaki Garden Tower (Shinagawa-ku, Tokyo)
- Arcade RPG game "Fate / Grand Order Arcade" begins operating
- "Puyopuyo" series approved for a Japan eSports Pro License
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| 2019 |
- Full stock purchase of a British game developer, Two Point Studios
- SEGA Group subsidiary becomes XD CO., LTD. following asset purchase from Dentsu, Inc.
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| 2020 |
- SEGA Games and SEGA Interactive merged into the SEGA Corporation
- SEGA Holdings Co., Ltd. changes name to SEGA GROUP CORPORATION.
- XD CO., LTD changes its name to SEGA XD CO., LTD.
- Online RPG, "Phantasy Star Online 2", released globally
- Released feature film Sonic the Hedgehog
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| 2021 |
- Implemented absorption merger between SEGA CORPORATION and SEGA GROUP CORPORATION, with SEGA CORPORATION as the surviving company.
- Transferred part of SEGA ENTERTAINMENT Ltd. to GENDA Inc.
*All remaining shares transferred to GENDA Inc. on Jan. 28, 2022.
- Sega Sapporo Studio Co., Ltd. established
- SEGA of America, Netflix and WildBrain work to produce, "SONIC PRIME", the new animated series based on "Sonic the Hedgehog"
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| 2022 |
- SEGA Singapore Pte. Ltd. established
- "Sonic the Hedgehog 2" movie released
- "Sonic Frontiers" released globally
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| 2023 |
- Purchase of Finnish global mobile-first games company, Rovio Entertainment Corporation
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| 2024 |
- Foundation of SEGA FAVE CORPORATION thorugh a merger between SEGA's Amusement Machine business and SEGA TOYS CO., LTD.
- Premiere of Like a Dragon: Yakuza on Prime Video.
- Released the third installment of Sonic film series, Sonic the Hedgehog 3.
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