| 1905年08月 |
Founded as Tokyo Tsukishima Kikai Seisakusho. |
| 1917年05月 |
Changed to a stock company and named Tsukishima Kikai Co., Ltd. |
| 1937年12月 |
The company merged with Dai-ni Tsukishima Kikai Co., Ltd. (former Tsurumi Factory), which was located in Tsurumi ward, Yokohama City. |
| 1949年05月 |
The company's shares were listed on the Tokyo Stock Exchange (listed in the First Section in October, 1961). |
| 1949年10月 |
The Osaka satellite office was opened (current Osaka Sales Branch Office). |
| 1961年10月 |
The company's shares were listed on the Second Section of the Osaka Securities Exchange (listed in the First Section in November, 1966). |
| 1961年10月 |
Laboratory was opened in Chuo ward, Tokyo. |
| 1971年04月 |
The pollution control-related equipment operation and management division was spun off and a subsidiary, Tsukishima Maintenance Co., Ltd., was founded. |
| 1974年03月 |
Company was accredited by Minister of Construction (special-48), No. 3484, due to changes in the Construction Industry Act. |
| 1976年01月 |
The Ichikawa Factory was opened. |
| 1979年04月 |
The construction work division was spun off and a subsidiary, Tsukishima Plant Construction Co., Ltd., was founded. |
| 1979年04月 |
The design, manufacturing, and sales divisions of sorting machine, attritor, and metal work machinery and instruments were spun off and Tsukishima Machine Sales Co., Ltd. was founded. |
| 1985年12月 |
The Tsurumi Factory was closed due to consolidation of production systems. |
| 1990年11月 |
The laboratory was relocated and newly opened in Ichikawa City, Chiba. |
| 1991年02月 |
Tsukishima Engineering Malaysia Sdn. Bhd. was founded in Malaysia as a local business office. |
| 1993年04月 |
TSK Engineering (Thailand) Co., Ltd.(currently a consolidated subsidiary) was founded in Thailand as a local business office. |
| 1994年11月 |
TSK Engineering Taiwan Co., Ltd. was founded in Taiwan as a local business office. |
| 1998年12月 |
The company acquired 20% of total issued shares of Kanuma Kankyo-bika Center (current SUN ECO THERMAL Co., Ltd. as a consolidated subsidiary), providing the company's entrance into the waste-disposal industry. |
| 2000年10月 |
The Environment Process Development Center was opened in Ichikawa City, Chiba. |
| 2000年11月 |
Tsukishima Maintenance Co., Ltd. and Tsukishima Plant Construction Co., Ltd. merged to form Tsukishima Techno Maintenance Service Co., Ltd. (currently a consolidated subsidiary). |
| 2005年03月 |
The company acquired 74.6% of total issued shares of Nittetu Chemical Engineering Ltd. (current Tsukishima Kankyo Engineering Ltd.), making it a consolidated subsidiary. |
| 2005年08月 |
Tsukishima Techno Machinery Co., Ltd. and former Tsukishima Machine Sales Co., Ltd. were merged to enhance and reinforce the company's equipment service business; Tsukishima Techno Machinery Co., Ltd. was the surviving company. |
| 2006年04月 |
Samukawa Water Service Co., Ltd. (currently a consolidated subsidiary), founded through investments made by the company, Tsukishima Techno Maintenance Service Co., Ltd., and others, was fully established. Operations began in the Samukawa Water Purification Plant Drainage special business of the Public Enterprises Agency of Kanagawa Prefecture pursuant to the Act on Promotion of Private Finance Initiative (PFI Act). |
| 2008年12月 |
The company merged with Tsukishima Fudosan Co., Ltd., a non-consolidated company. |
| 2011年03月 |
TSK Engineering China Co., Ltd. was founded in China as a local business office. (currently a consolidated subsidiary) |
| 2012年07月 |
Tsukishima Techno Solution Co., Ltd. acquired the industrial machinery business from Tsukishima Techno Machinery Co., Ltd. and changed its name to Tsukishima Machine Sales Co., Ltd. (currently a consolidated subsidiary). |
| 2012年07月 |
Tsukishima Kikai Co., Ltd. merged with Tsukishima Techno Machinery Co., Ltd. in an absorption type merger. |
| 2013年12月 |
Headquarters were relocated to the current location. The Environment Process Development Center was closed and that function was integrated with Ichikawa Research & Development Center. |
| 2014年10月 |
The company acquired the entire issued share capital of DAIDO CHEMICAL ENGINEERING CORP., making it a subsidiary. |
| 2014年12月 |
The company acquired 83.33% share capital of BOKELA GmbH (incorporated in Germany), making it a subsidiary. |
| 2017年04月 |
Following the completion of the Inuyama Water Purification Plant, other two water purification plants, and power generation facilities for the Aichi Public Enterprise Bureau pursuant to the Act on Promotion of Private Finance Initiative (PFI Act), operations began at Owari Water & Energy Co., Ltd. (currently a consolidated subsidiary). |
| 2017年07月 |
The company acquired the issued share capital of SANSHIN KOGYO Co., Ltd., making it a subsidiary. |
| 2019年04月 |
The Muroran Factory was opened. |
| 2021年04月 |
Following completion of the sewage sludge fuel conversion facility at the Toba Sewage Treatment Plant ordered by the city of Kyoto as a DBO project, operations began at Biocoal Kyoto Toba Co., Ltd. (currently a consolidated subsidiary), which was founded through investments made by the company and Tsukishima Techno Maintenance Service Co., Ltd. |
| 2022年04月 |
Following the restructuring of the Tokyo Stock Exchange's market segments, the company transitioned to the Prime Market. |
| 2023年04月 |
Tsukishima Kikai Co., Ltd. transitioned to a holding company structure and was renamed Tsukishima Holdings Co., Ltd. The water environment business was succeeded by Tsukishima Aqua Solutions, while the industrial business was succeeded by Tsukishima Kikai. |
| 2023年04月 |
Ichihara Biocycle Co., Ltd. (currently a consolidated subsidiary), which was established through joint investment by the company and others, commenced operations following the completion of facility development for the Matsugashima Terminal Treatment Plant Sewage Sludge Solid Fuel Project. This project was commissioned by the City of Ichihara as a DBO (Design-Build-Operate) initiative. |
| 2023年10月 |
Tsukishima Aqua Solution Co., Ltd. merges with JFE Engineering Corporation's domestic water engineering business; renamed Tsukishima JFE Aqua Solution Co., Ltd. |
| 2023年10月 |
In addition to Tsukisima & J Aqua Machine and Service Co., Ltd. (formerly JFE Aqua Service Equipment Co., Ltd.), seven special purpose companies (SPCs) involved in PFI and DBO projects were newly consolidated. |
| 2024年04月 |
Oyama Energy Cycle Co., Ltd. (currently a consolidated subsidiary), established through investment by Tsukishima JFE Aqua Solutions Co., Ltd. and others, commenced operations following the completion of facility development for sludge treatment and resource recovery at the Oyama Water Treatment Center. This project was commissioned by the City of Oyama as a PFI project. |
| 2024年10月 |
Tsukishima Kankyo Engineering Ltd.'s acquisition of DAIDO CHEMICAL ENGINEERING CORP. |
| 2025年02月 |
Following the completion of Sewage sludge and other resource utilization project at Iwaki City Chubu Purification Center and related facilities ordered by the city of Iwaki as a Promotion of Private Finance Initiative (PFI Act), operations commenced at Green Cycle Power IWAKI Co., Ltd. (currently a consolidated subsidiary), which was established through investments from the Tsukishima JFE Aqua Solution Co., Ltd. and others. |
