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Our Management Philosophy is “respect for people,” “technological orientation,” and “active consistency.”
In 1970, the year TENOX CORPORATION was founded, Japan was recording strong economic growth while paying little attention to the environment and human rights. It has been 55 years since TENOX CORPORATION (ten strong warriors, or oxen) was established to counter this trend and realize a peaceful society with little pollution. Even now, we always undertake our routine work holding this philosophy close to our hearts.

The mission of each employee is to develop solutions that only TENOX can provide and are kind to people.
Last fiscal year, we developed the new construction method CP-X, which dramatically reduces residual soil, a social problem, in the field of concrete piles. Furthermore, we are moving forward with research to control soil liquefaction, which can cause massive damage when earthquakes hit. We also aim to contribute to efforts to mitigate global warming by developing construction methods that produce little C02 emissions and the world’s first electric small pile driver.
That is truly active consistency. We will continue to pursue solutions that only TENOX can provide through technology.

We expect to have made steady progress with the Medium-Term Management Plan in fiscal 2024, the first year of the plan.
As for business performance, we will produce results related to solutions to social problems that only TENOX can provide and share them with our numerous stakeholders.

I hope for your even greater support.

Sunao Wakao
Tenox

Management Philosophy

The Company’s business purpose (mission) is to deliver peace of mind and safety to all people who use construction and civil engineering structures.
Therefore, in order to proceed with our work, we require trust from of all our stakeholders, customers, suppliers, cooperating companies, shareholders, and employees.
Society is constantly changing. The Company must actively respond to such changes and constantly provide new products and services. Technical certifications are held by more than 100 employees at the Company. As a technically proficient group, we will constantly embrace the challenge of expectations from society.

Company Profile

Corporate Name
TENOX CORPORATION
Established
July 8, 1970
Paid-in capital
¥1,710,900,000
Head Office Address
Huric Mita Bldg., 5-25-11 Shiba, Minato-ku, Tokyo 108-8380
TEL / FAX
03-3455-7790　03-3455-7683
Representative
Sunao Wakao, President and Representative Director
Business Activities
Sales of concrete piles and steel pipe piles; contracting for pile
driving construction and contracting for ground improvement construction
Construction License
Scaffolding and Earthwork business : Minister of Land, Infrastructure, Transport and Tourism (General-2) No.13763
Civil Engineering : Business Minister of Land, Infrastructure, Transport and Tourism (Special-2) No.13763
Paving business : Minister of Land, Infrastructure, Transport and Tourism (Special-2) No.13763
Landscaping and Gardening business : Minister of Land,Infrastructure, Transport and Tourism (Special-2) No.13763
No. of Employees
Employees　369 (consolidated; as of March 31, 2025)
Net Sales
Over ¥23,717 million (consolidated; for the fiscal year ended March 31, 2025)
Main Banks
Mizuho Bank (Akasaka Branch)
Sumitomo Mitsui Banking Corporation (Marunouchi Branch)
Sumitomo Mitsui Trust Bank (Shiba Sales Department)

List of officers

President and Representative Director Sunao Wakao
Director, Executive Officer Katsunori Takahashi Overseas Manager
Director, Executive Officer Naoya Matayoshi in charge of development
Director, Executive Officer Atsushi Taniyama Management General Manager
Director, Executive Officer Masaya Sano Planning Manager
Director, Executive Officer Toru Kurokawa Pile Business General Manager and Civil Engineering Sales Manager
Outside Director Full-time Audit and Supervisory Committee Member Toshiyuki Mizui
Outside Director Audit and Supervisory Committee Member Miki Suzuki
Outside Director Audit and Supervisory Committee Member Tomokazu Kubo
Managing Executive Officer Takashi Horikiri in charge of construction
Executive Officer Katsuhisa Kodama Greater Tokyo Area Business General Manager
Executive Officer Yuji Hirayama Technology General Manager and Technology Department Manager and Technology Group Manager
Executive Officer Kazuyuki Sakamoto Regional Business General Manager and Osaka Sales Office Manager
Executive Officer Yumenari Shimizu TENOX ASIA COMPANY LIMITED General Director

History

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1970〜1980
July 1970
Established Tenox Corporation in Minato Ward, Tokyo. Started sales and construction of concrete piles as an agent of Asahi Kasei Corporation.
December 1972
Moved head office to 2-4-1 Akasaka, Minato Ward, Tokyo.
October 1976
Entered into a basic contract as a dealer of Asahi Kasei Construction Materials Corporation.
February1977
Obtained a patent for the construction method of ready-made piles (inner excavation method).
March 1977
Established the construction machinery lease company Tenox Engineering Co., Ltd., in Minato Ward, Tokyo.
July 1977
Opened the Nagoya Sales Office in Nagoya City, Aichi Prefecture in order to expand sales in the Chubu region.
March 1980
Partnered with Shin-Nippon Seitetsu Co., Ltd. (currently Nippon Steel Corporation) for research and development of vibration-low and noise-low pile foundation methods using steel pipe piles and steel pipe sheet piles.
May 1980
Acquired certification from the Minister of Construction for the CMJ construction method that was jointly researched and developed with Asahi Kasei Construction Materials Corporation.
1981〜1990
April 1982
Established THAI TENOX CO., LTD. in Bangkok Thailand.
October 1983
Formed a research and development partnership with Sumitomo Cement Co., Ltd. (currently Sumitomo Osaka Cement Co., Ltd.) to use the soft ground hardening material in a low-rise building foundation method utilizing the Tenocolumn method.
March 1984
Obtained a patent for the Tenocolumn method.
May 1985
Acquired certification from the Minister of Construction for the TN method that was jointly researched and developed together with Shin-Nippon Seitetsu Co., Ltd. (currently Nippon Steel Corporation).
August 1985
Opened the Shonan Equipment Center in Higashi Katsushika County, Chiba Prefecture.
July 1986
Opened the Funabashi Equipment Center in Funabashi City, Chiba Prefecture.
May 1987
Opened the Osaka Sales Office in Osaka City, Osaka Prefecture to expand sales in the Kansai region.
December 1987
Established Tenox Kyushu Corporation and opened the Kyushu Sales Office in Omuta City, Fukuoka Prefecture in order to expand sales in the Kyushu region and to improve the construction system (moved to Fukuoka City in July 1988).
August 1988
Partnered with Housing and Urban Development Corporation (currently Urban Renaissance Agency), Nippon Steel Corporation, and Kubota Corporation to conduct research and development on Gantetsu Pile Method (Steel Pipe-Soil Cement Composite Pile method) .
August 1988
Partnered with Misawa Homes Co., Ltd. to acquire certification from the Minister of Construction for detached house soil improvement based on the Tenocolumn method, and to conduct research and development aimed at practical application.
Nobember 1988
Opened the Hokuriku Sales Office in Kanazawa City, Ishikawa Prefecture to expand sales in the Hokuriku region (reorganized into the Hokuriku Branch Office in April 2011).
February 1989
Opened the Chushikoku Sales Office in Hiroshima City, Hiroshima Prefecture to expand sales in the Chugoku region and in Shikoku.
July 1989
Opened the Tohoku Sales Office in Sendai City, Miyagi Prefecture to expand sales in the Tohoku region.
September 1989
Together with Misawa Homes Co., Ltd., acquired certification from the Minister of Construction for detached house soil improvement based on Tenocolumn method.
December 1990
Opened the Hokkaido Sales Office in Sapporo City, Hokkaido Prefecture to expand sales in the Hokkaido region.
1991〜2000
May 1991
Partnered with the Railway Technical Research Institute (currently a public interest incorporated foundation) and Tokyu Construction Co., Ltd., to research and develop an existing embankment reinforcement method (Radish Anchor Method) for agitated mixing piles.
June 1991
Partnered with Saga University for research and development of a lightweight soil method.
Nobember 1991
Performed over-the-counter registration of shares with Japan Securities Dealers Association.
February 1993
Acquired certification from the Minister of Construction for super-large diameter piles in the CMJ method.
March 1995
Moved head office to 6-13-7 Akasaka, Minato Ward, Tokyo.
March 1995
Acquired technology review and certification for the Gantetsu Pile method through the General Civil Engineering Method/Technology Review and Certification Project operated by the Japan Institute of Country-ology and Engineering.
September 1995
Added Yamamotogumi K.K. (Higashi Katsushika Gun, Chiba) to the group and changed its name to Tenox Giken Co., Ltd.
April 1997
Merged Tenox Engineering Co., Ltd. into Tenox Giken Co., Ltd., as one part of the reorganization of subsidiaries.
April 1997
Established Integrated Geotechnology Institute., Ltd., through a joint investment with Railway Technical Research Institute (currently a public interest incorporated foundation) primarily to achieve such goals as developing construction methods related to strengthening and improving soil.
Nobember 1997
Acquired technology review and certification for the radish anchor (large diameter rod reinforcement) construction method through the Advanced Construction Engineering Method/Technology Review and Certification Project operated by the Advanced Construction Technology Center.
May 1998
Integrated the Shonan Equipment Center and the Funabashi Equipment Center and reopened the former Funabashi Equipment Center as the Tokyo Equipment Center.
October 1998
Acquired certification from the Minister of Construction for the Gantetsu Pile method in regards to allowable bearing capacity as foundation pile.
October 1998
Acquired technology review and certification for the Tenocolumn (deep mixing) construction method through the Advanced Construction Engineering Method/Technology Review and Certification Project operated by the Advanced Construction Technology Center.
2001〜2010
March 2001
Merged with Prospec LLC in order to clarify shareholder composition.
July 2002
Acquired certification from the Minister of Land, Infrastructure, Transport and Tourism for the ATTcolumn.
July 2003
Acquired additional certification from the Minister of Land, Infrastructure, Transport and Tourism for increasing the diameter of the ATTcolumn.
December 2004
Canceled over-the-counter registration with the Japan Securities Dealers Association and listed shares on the JASDAQ Securities Exchange.
June 2005
Acquired certification from the Minister of Land, Infrastructure, Transport and Tourism for the TN-X construction method.
December 2005
Sold shares of THAI TENOX CO., LTD .as part of business restructuring and made the company into a non-consolidated subsidiary.
February 2010
Acquired construction technology performance certification for the Pure Pile method (Pile-type Ground Improvement Method for Detached house) jointly developed with JIO Corporation through the construction technology certification project operated by General Building Research Corporation of Japan.
April 2010
Listed on Osaka Stock Exchange’s JASDAQ market following merger of JASDAQ Securities Exchange and Osaka Stock Exchange.
2011〜2020
December 2011
Moved head office to the 5-25-11 Shiba, Minato Ward, Tokyo.
February 2012
Acquired construction technology performance certification for the Pure Pile method II.
February 2012
Developed Base Balance Method that makes it possible to implement soil liquefaction countermeasures for detached homes at a low cost, which was supervised by Tokai University Professor Emeritus Mamoru Fujii.
April 2013
Closed the Akita Branch Office and opened the North Tohoku Branch Office in Morioka City, Iwate Prefecture.
July 2013
Listed on the Tokyo Stock Exchange’s JASDAQ (standard) market following merger of Tokyo Stock Exchange and Osaka Stock Exchange.
October 2013
Renewed the technology review and certification for the TENOCOLUMN method through the Advanced Construction Engineering Method/Technology Review and Certification Project operated by the Advanced Construction Technology Center (added TENOCOLUMN-ECO that uses an ultra-high concentrated solidifying material liquid with a water/solidifying material ratio (W/C) of up to 45%).
March 2014
Obtained General Technical certification for ATT Column method by Japan Society of Civil Engineers.
March 2015
Obtained patent for Pure Pile method.
April 2015
Opened the Koriyama Branch Office in Koriyama City, Fukushima Prefecture.
April 2015
Transformed Tenox Kyushu Corporation and its subsidiary TENOX KYUSYU VIETNAM CO., LTD. from consolidated subsidiaries into equity-method subsidiaries.
September 2015
Established TENOX ASIA COMPANY LIMITED in Ho Chi Minh City, Socialist Republic of Vietnam.
January 2017
Removed Tenox Kyushu Corporation as an equity-method subsidiary following the transfers of some of its shares.
August 2018
Acquired technical certification for the Tenocolumn method in Vietnam.
March 2019
Acquired construction technology performance certification for Pure Pile method III.
June 2020
Renewed the technology review and certification for the TENOCOLUMN Method through the Advanced Construction Engineering Method/Technology Review and Certification Project operated by the Advanced Construction Technology Center (added TENOCOLUMN VCCS, a construction management system with remote monitoring and backup function).
July 2020
Celebrated 50-year anniversary.
October 2020
Acquired and transformed into subsidiaries Hiroshimagumi Co., Ltd., and Kametake Sangyo Co., Ltd., in order to enter the pile removal business and reinforce the construction system and sales capabilities in the Kansai region (Acquired Kametake Sangyo Co., Ltd. and merged it with Hiroshimagumi Co., Ltd., the surviving company, in February 2021).
December 2020
Formed a business and capital partnership with Nippon Hume Corporation.
2021〜
January 2021
Formed a business and capital partnership with Nippon Concrete Industries Co., Ltd.
October 2021
Acquired construction technology performance certification for SDS Pure Pile method (method for calculating bearing capacity based on screwdriver sounding test results).
April 2022
Listed on the Standard Market of the Tokyo Stock Exchange.
April 2022
Acquired Ohmishima Bussan Co., Ltd., and transformed it into a subsidiary in order to reinforce construction system and sales capabilities in the Shizuoka region (non-equity-method non-consolidated subsidiary).
March 2024
Completed electric small pile driver DHJ-15E protype jointly developed with Nippon Sharyo, Ltd., as one part of the company’s initiatives to achieve a sustainable society in the structure foundation work.
July 2024
Acquired construction method-related construction technology inspection certification for the TN-X Method (CP-X Method) from the Center for Better Living.
November 2024
Acquired General Technical certification for a method for calculating allowable bearing capacity of a foundation pile used in the CP-X method ( precast concrete pile method with high bearing capacity , where soil inside the pile is removed during driving) jointly developed with Nippon Hume Corporation from the Center for Better Living.
January 2025
Acquired construction method-related construction technology inspection certification for the TENOCUBE Method (shallow soil stabilization) from the Advanced Construction Technology Center.
January 2025
Acquired construction technology performance certification for the method for calculating the vertical bearing capacity of pile-type ground improvement for Pure Pile Mass IV construction method jointly developed with Japan Home Shield Corporation from the General Building Research Corporation of Japan.
June 2025
Concluded a memorandum of understanding regarding the acquisition of concrete pile manufacturing plant with SINO-PACIFIC CONSTRUCTION CONSULTANCY CO., LTD. (Ho Chi Minh City, Vietnam)

Organization chart

Business information

Construction Business

The four companies Tenox Corporation , Tenox Giken Co., Ltd. , Hiroshimagumi Co.,Ltd. and OHMISHIMA BUSSAN CO.,Ltd are engaged in a construction business that specializes in foundation construction. For Tenox Corporation, Tenox Giken mainly provides Tenox with Foundation construction contract and equipment rentals. Overseas, the business is operated by TENOX ASIA COMPANY LIMITED.

General Civil Engineering Consulting Business

The Integrated Geotechnology Institute Limited operates business related to general civil engineering consulting and a mediation business for construction work.

Other businesses

We are engaged in real estate rental business, etc.