4686 on Tokyo Stock Exchange

JustSystems

Logo: Public domain, via Wikimedia Commons4

Japanese software company

JustSystems Corporation (Japanese: 株式会社ジャストシステム, Hepburn: Kabushiki-gaisha Jasuto-Shisutemu) is a Japanese software development house. The company's main products were a word processor, Ichitaro ("JohnnyOne"), a Japanese input method, ATOK. In 2010s, they focus on correspondence education and enterprise software.2 It was founded by Kazunori Ukigawa.1 Its shares trade on Tokyo Stock Exchange under the symbol 4686.1 Wikipedia text CC BY-SA 4.0

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Last updated Oct 21, 2026.

Overview

Jun 2, 1981Founded1

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  • Ticker4686 on Tokyo Stock Exchange1
  • Industrysoftware industry1
  • HeadquartersTokushima1
  • Founded inTokushima1
  • Websitewww.justsystems.com
  • Legal formkabushiki gaisha1
  • LEI5299006DS4ZV570NR1923
  • StatusActive3
  • LEI statusLapsed (not renewed)3
  • Registered address川内町平石若松108番地4, 771-0189 徳島市, Japan3
  • Registered withNational Tax Agency, 74800010008613
Justsystems Headquarter Office
Photo: Tamago915, CC BY-SA 4.0, via Wikimedia Commons6

JustSystems Corporation (Japanese: 株式会社ジャストシステム, Hepburn: Kabushiki-gaisha Jasuto-Shisutemu) is a Japanese software development house. The company's main products were a word processor, Ichitaro ("JohnnyOne"), a Japanese input method, ATOK. In 2010s, they focus on correspondence education and enterprise software.2

The story

Founded by Kazunori Ukigawa on Jun 2, 1981, in Tokushima.1

JustSystems was founded in 1979 by Hatsuko and Kazunori Ukigawa, and was incorporated in June 1981. Early in the company's history, it created one of the first computer input methods for Japanese users, allowing kanji characters to be entered with a QWERTY keyboard. In the mid-1990s, JustSystems founded the Justsystem Pittsburgh Research Center near Carnegie Mellon University. In 1996, JustSystems purchased Claritech, a Carnegie Mellon startup run by David Evans, and renamed it JustSystems Evans Research (JSERI). In 1997, JustSystems went public and was listed on the JASDAQ Securities Exchange.

In 2006, JustSystems purchased the XMetaL XML authoring suite from Blast Radius to complement its xfy XML development platform. In 2009, Keyence Corporation became the largest shareholder of JustSystems. Later that year, Kazunori and Hatsuko Ukigawa resigned from the company.

From Wikipedia’s article on JustSystems, shared under CC BY-SA 4.0.5

Leadership

Who has led JustSystems, and when. Pick a name to see everywhere that person has worked.

Subsidiaries and ownership

Owners

From Wikidata.1

Timeline

  1. Jun 2, 1981Founded Founded in Tokushima1

Sources

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