| 1973-05 |
Established Y.E.S.I. Inc. in Akishima City, Tokyo, with a capital of 2,100 thousand yen. |
| 1973-05 |
Y.A.C. Co., Ltd. was established at Akishima, Tokyo with a capital of 2.1 million yen. |
| 1973-06 |
Entered the industrial packaging machinery industry. Started development and sales of packaging machines for the food industry and the cleaning industry. |
| 1973-06 |
Entered the industrial package business and started selling packaging equipment to the food and cleaning industries. |
| 1973-06 |
Entered the industrial packaging machinery industry. Started development and sales of packaging machines for the food industry and the cleaning industry. |
| 1975-08 |
Relocated headquarters to Tachikawa City, Tokyo. |
| 1975-08 |
Corporate head quarter moves to Tachikawa City, Tokyo. |
| 1976-05 |
Completed the Akishima Factory in Akishima City, Tokyo. |
| 1976-05 |
Built the Akishima factory in Akishima City, Tokyo. |
| 1977-01 |
Entered the semiconductor industry. |
| 1977-07 |
Entered the semiconductor business. |
| 1982-05 |
Completed the headquarters factory and relocated headquarters to Akishima City, Tokyo. |
| 1982-05 |
Built the headquarters factory in Akishima. |
| 1984-02 |
Developed and started sales of POS systems for liquor stores. |
| 1984-02 |
Developed and started selling POS systems for liquor stores. |
| 1985-08 |
Entered the magnetic disk industry. |
| 1985-08 |
Started magnetic memory disk business. |
| 1988-07 |
Completed the expansion of the headquarters factory in Akishima City, Tokyo. |
| 1988-07 |
Corporate main factory extends floors. |
| 1991-04 |
Established a representative office in Santa Clara, California, USA. |
| 1991-04 |
Opens California Representative Office at Santa Clara, California. |
| 1992-03 |
Established a Technical Center in Akishima City, Tokyo. |
| 1992-03 |
Builds Technical Center at Akishima City, Tokyo. |
| 1994-06 |
Registered shares on the over-the-counter market with the Japan Securities Dealers Association (currently JASDAQ Securities Exchange). |
| 1994-06 |
Started to traded on counter of Japan Securities Dealers Association (present “JQ”). |
| 1995-10 |
Established HYAC Corporation in California, USA, with a capital of 200 thousand US dollars. Established YAC Systems Singapore Pte Ltd in Singapore with a capital of 300 thousand Singapore dollars. |
| 1995-10 |
Established YAC Systems Singapore Pte. Ltd. at Singapore with a capital of S$300 thousand. |
| 1995-10 |
Established HYAC Corporation in California, USA, with capital of 200 thousand USD as a manufacturer and seller of various automation equipment. Also established YAC Systems Singapore Pte Ltd in Singapore with capital of 300 thousand SGD. |
| 1997-11 |
Completed the Akishima Second Factory. |
| 1997-11 |
Builds the 2nd Akishima Factory. |
| 2000-04 |
Merged with Plasma System Inc. and acquired the handler division from M.C. Electronics Inc. |
| 2000-04 |
Merged with Plasma System co., Ltd. |
| 2001-10 |
Acquired the business of industrial cleaning machinery from Fuji Vehicle Corporation and Fuji Washer Corporation. |
| 2001-10 |
Purchases industrial laundry equipment business from Fuji car Mfg group. |
| 2006-08 |
Made Yoshimura Seiki Corporation a consolidated subsidiary and renamed it Y.E.S.I. Niigata Seiki Corporation. |
| 2006-08 |
Acquires and consolidates Yoshimura Machinery Co., Ltd and changes the corporate name to YAC Niigata Machinery Co., Ltd. |
| 2006-10 |
The company's shares are listed on the Second Section of the Tokyo Stock Exchange. |
| 2006-10 |
Listed on TSE2. |
| 2007-12 |
Designated on the First Section of the Tokyo Stock Exchange. |
| 2007-12 |
Listed on TSE1. |
| 2009-05 |
Transferred the solar cell business division from S.E.S. Corporation. |
| 2009-05 |
Purchases Photo Voltaic business from S.E.S. Co., Ltd. |
| 2009-12 |
Established a local subsidiary in South Korea. |
| 2009-12 |
Establishes subsidiary in Korea. |
| 2010-05 |
Established a local subsidiary in China, Waye Xin (Shanghai) International Trading Co., Ltd. |
| 2010-05 |
Established YAC (Shanghai) International Trade Co., Ltd. in Shanghai, P.R.C. |
| 2011-04 |
Made Denco Corporation a consolidated subsidiary. |
| 2011-04 |
Acquired and consolidated Denko Co., Ltd. and changed name into YAC Denko Co., Ltd. |
| 2012-01 |
Changed the company name from Denco Corporation to Y.E.I. Denco Corporation. |
| 2012-01 |
DENKO Co., Ltd. changes corporate name to YAC DENKO Co., Ltd. |
| 2013-03 |
Made International Electric Heating Industry Co., Ltd. a consolidated subsidiary and renamed it "YAC International Electric Heating Co., Ltd.". |
| 2013-03 |
Acquired and consolidated Kokusai Dennetsu Co., Ltd and changed name into YAC Kokusai Dennetsu Co., Ltd. |
| 2013-11 |
Acquired and consolidated Ohkura Electric Co., Ltd. |
| 2013-11 |
Made Okura Electric Co., Ltd. a consolidated subsidiary. |
| 2014-06 |
Established Y.E.I. Dastec Corporation. |
| 2014-06 |
Established YAC Dastech Co., Ltd. |
| 2014-07 |
Made Y.E.I. Foton Corporation a consolidated subsidiary. |
| 2014-07 |
Acquired and consolidated Pheton Co., Ltd. and changed name into YAC Pheton Co., Ltd. |
| 2014-10 |
Established Shaoxing Micro Waye Xin Electronic Equipment Co., Ltd. |
| 2014-11 |
Established Shaoxing Weiaixin Electronic Equipment Co., Ltd. |
| 2014-11 |
Established Shaoxing Weiaixin Electronic Equipment Co., Ltd. |
| 2015-07 |
Made Japan Garter Corporation a consolidated subsidiary. |
| 2015-07 |
Acquired and consolidated Nihon Garter Co., Ltd. |
| 2015-10 |
Established a local subsidiary in Taiwan, Taiwan Micro Waye Xin Technology Co., Ltd. |
| 2015-10 |
Established T.Y.A.C.CORP. |
| 2016-01 |
Merged with Y.E.I. Foton Corporation. |
| 2016-01 |
Merged with YAC Phoeton Co., Ltd. |
| 2016-09 |
Acquired shares of Miyuki Elex Corporation (now Y.E.I. Elex Corporation) and made it a consolidated subsidiary. |
| 2016-09 |
Acquired and consolidated Miyuki Elecs Co., Ltd. |
| 2017-02 |
Transferred the ion beam application equipment business from Hitachi Ibaraki Technical Service Co., Ltd. |
| 2017-02 |
Acquired ion beam application equipment manufacturing business from Hitachi Ibaraki Technical Service Ltd. |
| 2017-04 |
Shifted to a holding company system and changed the company name to Y.E.I. Holdings Co., Ltd. |
| 2017-04 |
Transition to holding company system and changed name to Y.A.C. HOLDINGS CO., LTD. |
| 2018-04 |
Completed the construction of the Fuji factory in Minami-Tsuru District, Yamanashi Prefecture. |
| 2018-04 |
Built Fuji factory at Minamitsuru-Gun, Yamanashi. |
| 2019-04 |
Started a business unit system by classifying 13 consolidated subsidiaries into four business areas. |
| 2019-04 |
Started Business Unit system by dividing 13 consolidated companies into 4 business field. |
| 2020-03 |
Acquired shares of Daiichi Corporation (Saitama Prefecture, Sayama City) and made it a consolidated subsidiary. |
| 2020-03 |
Acquired shares of Daiichi Co., Ltd. (Sayama, Saitama) and made it a consolidated subsidiary. |
| 2020-10 |
Y.E.S. Gutter Corporation (Surviving Company) merged with Daiichi Corporation (Dissolved Company). |
| 2020-10 |
Discontinued the business unit system. |
| 2020-10 |
YAC Garter Co., Ltd. (surviving company) merged with Daiichi Co., Ltd. (disappearing company). |
| 2020-10 |
Terminated business unit system. |
| 2021-04 |
Y.E.S. Denko Corporation (Surviving Company) merged with YAC International Electric Heating Corporation (Dissolved Company). |
| 2021-04 |
YAC Denko Co., Ltd. (surviving company) and YAC Kokusai Dennetsu Co., Ltd. (disappearing company) merged. |
| 2022-04 |
Transitioned from the First Section of the Tokyo Stock Exchange to the Prime Market. |
| 2022-04 |
Moved from the First Section of the Tokyo Stock Exchange to the Prime Market. |
| 2022-10 |
Y.E.S. Machinery Corporation (Surviving Company) merged with Y.E.S. Niigata Seiki Corporation (Dissolved Company). |
| 2022-10 |
Y.A.C. Machinery Co., Ltd. (surviving company) and YAC Niigata Machinery Co., Ltd. (disappearing company) merged. |
| 2023-04 |
Y.E.S. Denko Corporation (Surviving Company) merged with Y.E.S. Technologies Corporation (Dissolved Company). |
| 2023-04 |
Acquired shares of JE International Corporation and GD Tech Corporation, and made them consolidated subsidiaries. |
| 2023-04 |
YAC Denko Co., Ltd. (surviving company) and Y.A.C. Technology Co., Ltd. (disappearing company) merged. |
| 2023-04 |
Acquired shares of JE International Corporation and GD tech Co., Ltd. and made them consolidated subsidiaries. |
| 2023-05 |
Signed a capital partnership agreement with LINUS BIOTECHNOLOGY, INC. in the United States. |
| 2023-05 |
Concluded an agreement on capital alliance with Linus Biotechnology Inc. |
| 2023-05 |
Signed a capital alliance agreement with LINUS BIOTECHNOLOGY, INC. in the United States. |
| 2023-09 |
Ohkura Electric Co., Ltd. acquires all shares of Hosyo-Sangyo Inc. and makes it a consolidated subsidiary. |
| 2023-09 |
Acquired all shares of Takaho Sangyo Co., Ltd. and made it a consolidated subsidiary. |
| 2024-04 |
Established Y.E.S. Bio Corporation and made it a consolidated subsidiary. |
| 2024-04 |
YAC BIO Inc. is established and becomes a wholly owned subsidiary. |
| 2025-01 |
Acquired some shares of TT Holdings Corporation (which wholly owns Topcon Techno House Corporation) and made it a consolidated subsidiary. |
| 2025-01 |
Partial acquisition of TT Holdings, Inc. shares, which owns 100% of the shares of Topcon Technohouse Corporation, to make it a consolidated subsidiary. |
| 2025-04 |
Topcon Techno House Corporation changed its name to Techno Optis Corporation. |
| 2025-04 |
Topcon Technohouse Corporation changed its name to TechnoOptis Co., Ltd. |
| 2025-07 |
Acquired additional shares of Techno Optis Corporation (wholly owned by TT Holdings Corporation) and made it a wholly owned subsidiary. |
| 2025-07 |
Acquired additional shares of TT Holdings, Inc., which owns 100% of the shares of TechnoOptis Co., Ltd. to make it a wholly owned subsidiary. |
| 2026-01 |
Merged Techno Optis Corporation (Surviving Company) with TT Holdings Corporation (Dissolved Company). |
| 2026-01 |
TechnoOptis Co., Ltd. (surviving company) and TT Holdings, Inc. (disappearing company) merged. |
| 2026-03 |
Acquired subsidiaries Sanwa Electric Instruments Corporation and Sanwa Test Mechs Corporation. |
| 2026-03 |
Acquisition of Sanwa Electric Instrument Co., Ltd. and Sanwa Tesmex Co., Ltd. as subsidiaries. |
| 2026-03 |
Acquisition of Sanwa Electric Instrument Co., Ltd. and Sanwa Tesmex Co., Ltd. as subsidiaries. |
