| 1958-02 |
Established: February 1958. |
| 1968-02 |
February 1968: (Yamau Cement Industry Co., Ltd.) reorganized into Yamau Cement Products Industry Co., Ltd. Factory: Fukuoka Factory |
| 1968-02 |
Yamau Cement Industry Co., Ltd. reorganized into Yamau Cement Products Industry Co., Ltd. Factory: Fukuoka Factory. |
| 1971-11 |
November 1969: Established Miyazaki Factory in Higashimorokata District, Miyazaki Prefecture (now Miyazaki City), starting production of small road and agricultural civil engineering concrete products |
| 1971-11 |
Established Miyazaki Factory in Higashimorokata District, Miyazaki Prefecture (now Miyazaki City), and began manufacturing small-scale road and agricultural civil engineering concrete products. |
| 1973-05 |
May 1970: Established Yamau General Development Co., Ltd. in Fukuoka City, Fukuoka Prefecture, developing, designing, constructing, and managing concrete products |
| 1973-09 |
Established Takasaki Factory in Kitamorokata District, Miyazaki Prefecture (now Miyazaki City), and began manufacturing large-scale road and agricultural civil engineering concrete products. |
| 1973-11 |
September 1973: Established Takasaki Factory in Kitamorokata District, Miyazaki Prefecture (Miyazaki City), starting production of large road and agricultural civil engineering concrete products |
| 1974-09 |
September 1974: Yamau Saichi Precon Co., Ltd. and Yamau Precon Co., Ltd. merged, changing the company name to Yamau Co., Ltd. Factories: Saga First Factory (April 1979 renamed Saga Factory), Kagoshima Factory |
| 1974-09 |
Absorbed and merged Yamau Aichi Precast Co., Ltd. and Yamau Precast Co., Ltd., changing the corporate name to Yamau Co., Ltd. Factories: Saga First Factory (renamed Saga Factory in April 1984), Kagoshima Factory. |
| 1976-05 |
Established Yamau Comprehensive Development Co., Ltd. in Fukuoka City, Fukuoka Prefecture, and engaged in development, design, construction, and management of concrete products. |
| 1976-09 |
September 1976: Established Yamau Trading Co., Ltd. in Fukuoka City, Fukuoka Prefecture, starting sales of civil engineering and construction materials |
| 1976-09 |
Established Yamau Trading Co., Ltd. in Fukuoka City, Fukuoka Prefecture, and began selling civil engineering and construction-related materials. |
| 1977-10 |
October 1977: Entered into a sales partnership with Asahi Concrete Industry Co., Ltd. to mutually supply concrete products |
| 1977-10 |
Entered a sales partnership with Asahi Concrete Industry Co., Ltd. to mutually supply concrete products. |
| 1979-08 |
August 1979: Obtained ministerial approval for general construction business |
| 1979-08 |
Obtained ministerial approval for general construction business. |
| 1980-01 |
January 1980: Acquired Asahi Concrete Industry Co., Ltd. and made it a subsidiary. Factories: Kawanami Factory, Kitakyushu Factory |
| 1980-01 |
Acquired Asahi Concrete Industry Co., Ltd. and made it a subsidiary. Factories: Kawanami Factory, Kitakyushu Factory. |
| 1980-08 |
August 1980: Established Kagoshima Building Materials Factory in Aira District, Kagoshima Prefecture (now Kirishima City), starting production of landscape-related products |
| 1980-08 |
Established Kenbai Kagoshima Factory in Aira District, Kagoshima Prefecture (now Kirishima City), and began manufacturing landscape-related products. |
| 1980-11 |
November 1980: Established Rejikon Factory in Jiyu District, Miyazaki Prefecture (now integrated into Kawanami Factory), starting production of resin concrete products |
| 1981-10 |
October 1981: Established Oita Factory in Ogi District, Oita Prefecture (now Usuki City), and Saga Second Factory in Kasaoka District, Saga Prefecture (now Saga Factory), starting production of road and agricultural civil engineering concrete products |
| 1981-11 |
Established Rejicon Factory in Jiyu District, Miyazaki Prefecture (now merged into Kawanami Factory) and began manufacturing resin concrete products. |
| 1982-10 |
Established Oita Factory in Ono District, Oita Prefecture (now Usuki City) and Saga Second Factory in Kasa District, Saga Prefecture (now Saga Factory) and began manufacturing road and agricultural civil engineering concrete products. |
| 1985-10 |
October 1985: Acquired Yamau General Development Co., Ltd. and made it a subsidiary |
| 1985-10 |
Acquired Yamau Comprehensive Development Co., Ltd. and made it a subsidiary. |
| 1987-04 |
Established Tokyo and Osaka offices to expand into Honshu. |
| 1990-04 |
April 1987: Established Tokyo Sales Office and Osaka Sales Office to expand into Honshu |
| 1990-06 |
June 1990: Established Hamamatsu plant in Iwata-gun, Shizuoka Prefecture, and began manufacturing landscape-related products. |
| 1990-06 |
Established Hamamatsu Factory in Iwata District, Shizuoka Prefecture and began manufacturing landscape-related products. |
| 1992-04 |
April 1992: Absorbed merger of Asahi Concrete Industry Co., Ltd., YamaU Trading Co., Ltd., and YamaU Comprehensive Development Co., Ltd. |
| 1992-04 |
Absorbed and merged Asahi Concrete Industry Co., Ltd., Yamau Trading Co., Ltd., and Yamau Comprehensive Development Co., Ltd. |
| 1993-11 |
November 1993: Established Okayama plant in Ato-gun, Okayama Prefecture, and Iwaki plant in Iwaki City, Fukushima Prefecture, and began manufacturing landscape-related products. |
| 1993-11 |
Established Okayama Factory in Aka District, Okayama Prefecture and Iwaki Factory in Iwaki City, Fukushima Prefecture, and began manufacturing landscape-related products. |
| 1995-10 |
October 1995: Registered as a listed security for over-the-counter trading with the Japan Securities Association. |
| 1995-10 |
Registered as a listed securities dealer with the Japan Securities Dealers Association. |
| 2000-10 |
October 2000: Obtained ISO 9001 certification. |
| 2000-10 |
Obtained ISO 9001 certification. |
| 2001-11 |
November 2001: Established new headquarters building in Hakata-ku, Fukuoka City, Fukuoka Prefecture, and relocated the head office. |
| 2001-11 |
Established a new corporate building in Fukuoka City (Sagaraku), Fukuoka Prefecture and relocated the headquarters. |
| 2002-10 |
October 2002: Closed the Okayama plant. |
| 2002-10 |
Closed the Okayama plant. |
| 2003-05 |
May 2003: As part of business restructuring, fully withdrew from Honshu operations, closing the Iwaki plant, Hamamatsu plant, and other Honshu facilities. |
| 2003-05 |
As part of restructuring, fully withdrew from the Honshu business, closing the Iwaki plant, Hamamatsu plant, and other Honshu offices. |
| 2003-11 |
November 2003: Established YamaU Asahi Co., Ltd. as a joint venture with Asahi Mesh Industry Co., Ltd. |
| 2003-11 |
Established Yamau Asahi Co., Ltd. as a joint venture with Asahi Mesh Industry Co., Ltd. |
| 2004-06 |
June 2004: Established YamaU Trust Co., Ltd., a subsidiary contracted for concrete product manufacturing (reorganized from YamaU Trust Co., Ltd.). |
| 2004-06 |
Established Yamau Trust Co., Ltd., a subcontracting subsidiary for our concrete product manufacturing (reorganized into Yamau Trust Co., Ltd.). |
| 2004-12 |
December 2004: Listed shares on the JASDAQ Securities Exchange following its establishment. |
| 2004-12 |
With the establishment of the JASDAQ Securities Exchange, listed shares on the exchange. |
| 2005-04 |
April 2005: Established NeoTrust Co., Ltd., a subsidiary contracted for concrete product manufacturing. |
| 2005-04 |
Established Neo Trust Co., Ltd., a subcontracting subsidiary for our concrete product manufacturing. |
| 2006-06 |
June 2006: Established PIO Co., Ltd. and PIO Tech Co., Ltd. as new business ventures. |
| 2006-06 |
Established PIO Co., Ltd. and PIO Tech Co., Ltd. as new business initiatives. |
| 2006-08 |
August 2006: Established Kukan Sales Co., Ltd. (renamed from Fukuoka Precon Sales Co., Ltd.) following a business partnership with Kukan Co., Ltd. |
| 2006-08 |
Established Kukan Sales Co., Ltd. (renamed to Fukuoka Precon Sales Co., Ltd.) in connection with a business partnership with Kukan Co., Ltd. |
| 2007-04 |
April 2007: YamaU Trust Co., Ltd. and YamaU Asahi Co., Ltd. merged, with YamaU Trust Co., Ltd. as the surviving company. |
| 2007-04 |
Yamau Trust Co., Ltd. and Neo Trust Co., Ltd. merged, with Yamau Trust Co., Ltd. as the surviving company. |
| 2007-06 |
June 2007: Established Mecc Co., Ltd. as a new business venture. |
| 2007-06 |
Established Mecc Co., Ltd. as a new business initiative. |
| 2007-09 |
September 2007: Established Creative Mold Co., Ltd. to manufacture and sell concrete product forms. |
| 2007-09 |
Established Creative Mold Co., Ltd. to manufacture and sell concrete product formwork. |
| 2008-01 |
January 2008: Acquired Koyo System Equipment Co., Ltd. and made it a subsidiary. |
| 2008-01 |
Acquired Koyo System Equipment Co., Ltd. and made it a subsidiary. |
| 2009-01 |
January 2009: Acquired Oita Fuji Co., Ltd. and made it a subsidiary. |
| 2009-01 |
Acquired Oita Fuji Co., Ltd. and made it a subsidiary. |
| 2009-03 |
March 2009: Sold all shares of PIO Co., Ltd. and PIO Tech Co., Ltd. |
| 2009-03 |
Sold all shares of PIO Co., Ltd. and PIO Tech Co., Ltd. |
| 2010-04 |
April 2010: Listed on the Osaka Securities Exchange (JASDAQ market) following the merger of the JASDAQ Securities Exchange and the Osaka Securities Exchange. |
| 2010-04 |
With the merger of the JASDAQ Securities Exchange and the Osaka Securities Exchange, listed on the Osaka Securities Exchange (JASDAQ market). |
| 2010-10 |
October 2010: Established Miyazaki Precon Co., Ltd. and made it a subsidiary. |
| 2010-10 |
October 2010: Listed on the Osaka Securities Exchange Hercules, and following the integration of the JASDAQ and NE markets of the same exchange, listed shares on Osaka Securities Exchange JASDAQ (Standard). |
| 2010-10 |
Established Miyazaki Precon Co., Ltd. and made it a subsidiary. |
| 2010-10 |
Listed on the Osaka Securities Exchange Hercules, and following the integration of the JASDAQ and NE markets on the same exchange, listed shares on the Osaka Securities Exchange JASDAQ (Standard). |
| 2011-10 |
October 2011: Established the Kanto Division in Nihonbashi, Chuo-ku, Tokyo. |
| 2011-10 |
Established the Kanto Business Division in Nihonbashi, Chuo-ku, Tokyo. |
| 2012-04 |
April 2012: Acquired Kaisei Kogyo Co., Ltd. and made it a subsidiary. |
| 2012-04 |
Acquired Kaisei Industrial Co., Ltd. and made it a subsidiary. |
| 2012-07 |
July 2012: Established the Kumamoto Branch Office in Kumamoto City, Kumamoto Prefecture. |
| 2012-07 |
Established a Kumamoto sales office in Kumamoto City, Kumamoto Prefecture. |
| 2013-07 |
July 2013: Following the integration of the physical markets of the Tokyo and Osaka Stock Exchanges, listed shares on the Tokyo Stock Exchange JASDAQ (Standard). |
| 2013-07 |
Following the integration of the physical markets of the Tokyo Stock Exchange and Osaka Stock Exchange, shares were listed on the Tokyo Stock Exchange JASDAQ (Standard). |
| 2013-12 |
December 2013: Established Repair Engine Co., Ltd. and made it a subsidiary. |
| 2013-12 |
Established RepaEngine Co., Ltd. and made it a subsidiary. |
| 2015-06 |
June 2015: Acquired Daiei Development Co., Ltd. and made it a subsidiary. |
| 2015-06 |
Acquired Daiei Development Co., Ltd. and made it a subsidiary. |
| 2016-10 |
October 2016: Established Kumamoto Yamau Co., Ltd. |
| 2016-10 |
Established Kumamoto Yamau Co., Ltd. |
| 2017-04 |
April 2017: Yamau Trust Co., Ltd., Yamau Asahi Co., Ltd., and Creative Mold Co., Ltd. merged, with Yamau Trust Co., Ltd. as the surviving company. |
| 2017-04 |
Yamau Trust Co., Ltd., Yamau Asahi Inc., and Creative Mold Co., Ltd. merged into Yamau Trust Co., Ltd. as the surviving company. |
| 2019-04 |
April 2019: Miyazaki Precon Co., Ltd. was absorbed and merged. |
| 2019-04 |
Absorbed Miyazaki Precon Co., Ltd. |
| 2020-03 |
Acquired Nakaigai Road Co., Ltd. and made it a subsidiary. |
| 2021-03 |
April 2021: Yamau Co., Ltd. changed its name to Yamau Holdings Co., Ltd. and transitioned to a holding company structure. Through a newly established split, Yamau Co., Ltd. was established and made a subsidiary. |
| 2021-04 |
April 2021: Moved headquarters to Chuo-ku, Fukuoka City, Fukuoka Prefecture. |
| 2021-04-01 |
April 1, 2021: Changed corporate name from Yamau Co., Ltd. due to becoming a holding company. |
| 2021-04 |
Changed its name from Yamau Co., Ltd. to Yamau Holdings Co., Ltd. and transitioned to a holding company structure. Established Yamau Co., Ltd. through a spin‑off and made it a subsidiary. |
| 2021-04 |
Moved headquarters to Chuo‑ku, Fukuoka City, Fukuoka Prefecture. |
| 2022-04 |
April 2022: Moved from JASDAQ (Standard) to the Standard market due to a review of market classifications by the Tokyo Stock Exchange. |
| 2022-04 |
April 2022: Yamau Co., Ltd. as the surviving company absorbed and merged Fukuoka Precon Sales Co., Ltd. |
| 2022-04 |
Moved from JASDAQ (Standard) to the Standard market due to a review of market classifications at the Tokyo Stock Exchange. |
| 2022-04 |
Merged Fukuoka Precon Sales Co., Ltd. into Yamau Co., Ltd. as the surviving company. |
| 2023-04 |
April 2023: Yamau Co., Ltd. as the surviving company absorbed and merged Yamau Trust Co., Ltd. |
| 2023-04 |
Merged Yamau Trust Co., Ltd. into Yamau Co., Ltd. as the surviving company. |
| 2024-04 |
April 2024: Yamau Co., Ltd. as the surviving company absorbed and merged Repair Engine Co., Ltd. |
| 2024-04 |
Merged RepaEngine Co., Ltd. into Yamau Co., Ltd. as the surviving company. |
