| 1957 |
Founded Oriental Consultants Co., Ltd. in 1957. |
| 1957 |
Founded Oriental Consultants Co., Ltd. |
| 1988 |
Established Oriental Center Co., Ltd. in 1988. Since then, group companies have joined and promoted the group strategy. |
| 1988 |
Founded Oriental Center Co., Ltd. in 1988. |
| 1988 |
Established Oriental Center Co., Ltd., followed by participation of group companies to promote group strategy. |
| 1999 |
Formed the Oricon Consulting Group in 1999. |
| 2000 |
Listed on the over-the-counter market of the Japan Securities Association in 2000 (now the Tokyo Stock Exchange Standard Market). |
| 2000 |
Listed on the Tokyo Stock Exchange Standard Market (formerly Japan Securities Dealers Association). |
| 2006-08-28 |
On August 28, 2006, a share transfer from Oriental Consultants Co., Ltd. led to the establishment of the pure holding company ACK Group Co., Ltd. It was listed on the JASDAQ and started with 11 business companies. |
| 2006-08-28 |
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| 2006-08-28 |
On August 28, 2006, established ACK Group, a pure holding company, through share transfer from Oriental Consultants Co., Ltd., to strengthen the management foundation. |
| 2006-08-28 |
Established a pure holding company, ACK Group, through a share transfer from Oriental Consultants Co., Ltd. Listed on the JASDAQ Securities Exchange. Announced the medium-term management plan "ACKG ONE." |
| 2006-08-28 |
Establishment of Oriental Consultants Co., Ltd. |
| 2007 |
In 2007, it established a solid position in the geology and soil-related sector and, aiming for a one-stop service in soil and groundwater pollution control, fully acquired Daisei Foundation Design Co., Ltd. |
| 2007 |
In 2007, fully acquired Taisei Foundation Design Co., Ltd. (now Asano Taisei Foundation Engineering Co., Ltd.). |
| 2007 |
Established a solid position in the geology and soil-related sectors, and fully acquired Taisei Foundation Design Co., Ltd. as a wholly owned subsidiary to provide one-stop services for soil, groundwater contamination countermeasures, and renewal projects. |
| 2008 |
In 2008, Oriental Consultants Co., Ltd. acquired overseas consulting operations from Pacific Consultants International. |
| 2008 |
To expand overseas business, Oriental Consultants Co., Ltd. acquires overseas consulting business from Pacific Consultants International. |
| 2009 |
In 2009, World Co., Ltd. and Oriental Center Co., Ltd. merged and renamed to Aitec Co., Ltd., announcing the medium- to long-term management strategy 'ACKG 2010'. |
| 2009 |
In 2009, merged World Co., Ltd. and Oriental Center Co., Ltd., and changed the company name to A-Tech Co., Ltd. |
| 2009 |
Merged with Escentra Co., Ltd., and changed the company name to ATEK Co., Ltd. Announced the medium- to long-term management strategy "ACKG 2010." |
| 2011 |
In 2011, Yoshii System Research Co., Ltd. and Oriental Shared Services Co., Ltd. merged and renamed to Research and Solution Co., Ltd. Daisei Foundation Design Co., Ltd. and Asano Construction Co., Ltd. merged and renamed to Asano Daisei Foundation Engineering Co., Ltd. |
| 2011 |
In 2011, merged Yoshii System Research Co., Ltd. and Oriental Shared Services Co., Ltd., and changed the company name to Research and Solution Co., Ltd. |
| 2011 |
In 2011, merged Taisei Foundation Design Co., Ltd. and Asano Kenko Co., Ltd., and changed the company name to Asano Taisei Foundation Engineering Co., Ltd. |
| 2011 |
Merged with Yoshii System Research Co., Ltd. and Esared Services Co., Ltd., and changed the company name to Research and Solution Co., Ltd. |
| 2012 |
In 2012, the medium-term management plan 'ACKG2013' was announced, targeting sales of 50 billion yen and operating profit of 2 billion yen in 2020. |
| 2012 |
Announced the medium-term management plan "ACKG2013" in 2012. |
| 2012 |
Announced the medium-term management plan "ACKG2013." Declared sales of 50 billion yen and operating profit of 2 billion yen as goals for 2020. |
| 2014 |
In 2014, measures to strengthen 'ACKG2013' were announced, and the overseas business division was spun off to establish Oriental Consultants Global Co., Ltd. |
| 2014 |
In 2014, announced the medium-term management plan "ACKG2013" (Strengthening). |
| 2014 |
Announced the strengthened medium-term management plan "ACKG2013." Declared three strengthening policies to ensure the achievement of the 2020 goals. Spun off the overseas division of Oriental Consultants Co., Ltd. and established Oriental Consultants Global Co., Ltd. |
| 2015 |
In 2015, under the theme 'Towards Further Growth', the 10th anniversary ceremony and celebration of the establishment of ACK Group Co., Ltd. were held. |
| 2015 |
Held the 10th anniversary ceremony and celebration of the establishment of ACK Group Co., Ltd. in 2015. |
| 2015 |
Held the 10th anniversary ceremony and celebration of ACK Group. |
| 2017 |
In 2017, the Marumari Project, in which Oriental Consultants Global Co., Ltd. participated, won the FIDIC Award 2017 Grand Prize. |
| 2017 |
In 2017, the Marmara Project in Turkey, participated by Oriental Consultants Global, won the FIDIC Award 2017 Grand Prize for the Bosporus Strait Crossing Subway Construction. |
| 2017 |
The subway construction project for the Marmara Province in Turkey received the FIDIC Award 2017 Grand Prize. |
| 2018 |
In 2020, sales of 50 billion yen were achieved two years ahead of schedule, and the company was renamed Oriental Consultants Holdings Co., Ltd. A new vision and medium-term management plan for 2025 were formulated. |
| 2018 |
In 2018, formulated a new vision and medium-term management plan targeting 2025, declaring sales of 70 billion yen and operating profit of 3 billion yen. |
| 2018 |
In 2018, renamed to Oriental Consultants Holdings. |
| 2018 |
Achieved the 2020 sales target two years ahead of schedule and renamed to Oriental Consultants Holdings. Developed new vision and medium-term management plan for 2025. |
| 2022 |
In 2022, business expansion was promoted, and the operating profit target for the fiscal year ending September 2021 was achieved four years ahead of schedule. The goal for 2030 is sales of 110 billion yen and operating profit of 7 billion yen. |
| 2022 |
In 2022, formulated a new vision and medium-term management plan targeting 2030, declaring sales of 110 billion yen and operating profit of 7 billion yen. |
| 2022 |
Promoted business expansion and achieved the operating profit target for the September 2021 term four years ahead of schedule. Developed new vision and medium-term management plan targeting 2030. |
| 2023 |
In 2023, the roadside station 'Maebashi Akagi', participated by Road Station Maebashi Kamikata Co., Ltd., opened, and was selected first place in the national overall category of the 'Roadside Station Grand Prize' in 2025. |
| 2023 |
In 2023, Maebashi City’s new roadside station "Maebashi Akagi," with Road Station Maebashi Maebashi Uebu participating as a business operator, opened. |
| 2023 |
Related company Road Station Maebashi Kamitake opened the "Maebashi Akagi" roadside station. |
| 2024 |
In 2024, based on management responses that considered capital cost and stock price in the '2030 Vision and Medium-Term Management Plan', part of the basic policy was updated. |
| 2024 |
In 2024, updated some basic policies considering capital costs and stock prices, in response to realizing management that emphasizes DX, security enhancement, internal control, and perspectives on capital costs and stock prices, based on the "2030 Vision and Medium-Term Management Plan". |
| 2024 |
Partially updated the contents of the "2030 Vision and Medium-Term Management Plan." |
| 2025 |
In 2025, Oriental Consultants Co., Ltd. won the Grand Prize at the Japan Resilience Award 2025 for the 'One Coin Flood Sensor' and other DX applications, and held a 20th anniversary ceremony. |
| 2025 |
In 2025, Oriental Consultants received the Grand Prix at the Japan Resilience Award 2025 for efforts utilizing DX in flood response with a one-coin flood sensor and 3D pipe interior maps. |
| 2025 |
Held the 20th anniversary ceremony and celebration in 2025. |
| 2025 |
Oriental Consultants Co., Ltd. received the Grand Prix at the Japan Resilience Award 2025. Held the 20th anniversary ceremony. |
