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- 1978 Jul.
- World Publishing Co Ltd established, to publish learning materials.
- 1983 Dec.
- Company name changed to National Institute of Education Ltd.
- 1988 Dec.
- Merged with World Miner K.K. and changed company name to Zenken Honsha K.K.
- 2000 Jan.
- Started IT business (Internet fusion tutoring school Sosai Gakuin (now Z NET SCHOOL) is established).
- 2005 Mar.
- Started e-marketing business (media business launched).
- 2007 May.
- Spun off language business and established ZENKEN CAREER CENTRE Co.
- 2009 Dec.
- ZENKEN CAREER CENTRE CORPORATION changed its name to LINGUAGE CORPORATION.
- 2013 Jul.
- Linguage Corporation launches Linguage Speak, an English conversation lesson service through SKYPE.
- 2014 Jul.
- Linguage Corporation opens its first Linguage English conversation school in Shinjuku Nishiguchi.
- 2015 Apr.
- Zenken Plaza II is completed and real estate business is launched.
- 2016 May.
- Sciseed Inc. is acquired for the purpose of providing fee-based employment placement services.
- 2016 Jun.
- Merged with Lingage Co.
- 2017 Apr.
- Sciseed Inc. launches its AI business.
- 2017 Oct.
- Linguage Japanese Language School opens.
- 2018 Jan.
- Diversity Division is established as an overseas IT human resources business.
- 2019 Jun.
- ZENKEN INDIA LLP is established in the Indian IT city of Bengaluru
- 2020 Feb.
- Head office relocated to Nishi-Shinjuku 6-chome, Shinjuku-ku, Tokyo.
- 2021 Jun.
- Shares listed on the Tokyo Stock Exchange Mothers.
- 2021 Oct.
- English conversation school business transferred.
- 2022 Apr.
- Zenken Care Co Ltd is established to operate flagship facilities utilizing overseas nursing care personnel.
- 2022 Jul.
- Overseas care personnel business is launched.
- 2023 May.
- Sciseed Inc. is transferred.
- 2023 Oct.
- Company name changed to Zenken Corporation.