Kumamoto Yamau Corporation

September 1973: Established Takasaki Factory in Kitamorokata District, Miyazaki Prefecture (Miyazaki City), started manufacturing large-scale concrete products for roads and agricultural civil engineering.

September 1974: Merged Yamau Sōchi Precast Co., Ltd. and Yamau Precast Co., Ltd., changed company name to Yamau Co., Ltd. Factories: Saga First Factory (renamed Saga Factory in April 1984), Kagoshima Factory.

September 1976: Established Yamau Trading Co., Ltd. in Fukuoka City, started sales of civil engineering and construction-related materials.

October 1977: Formed sales partnership with Asahi Concrete Industry Co., Ltd., to supply concrete products mutually.

August 1979: Obtained general construction business license.

January 1980: Acquired Asahi Concrete Industries Co., Ltd. and made it a subsidiary. Factories: Kawanami Factory, Kitakyushu Factory

August 1980: Established the Kagoshima Building Material Factory in Aira District, Kagoshima Prefecture (now Kirishima City, Kagoshima Prefecture), and started manufacturing landscape-related products.

November 1980: Established a resin concrete factory in Koyu District, Miyazaki Prefecture (now integrated into Kawanami Factory), and started manufacturing resin concrete products.

October 1981: Established Oita Factory in Oita District, Oita Prefecture (now Oita City), and Saga Second Factory (now Saga Factory) in Kanzaki District, Saga Prefecture, and started manufacturing concrete products for roads and agricultural civil engineering.

October 1985: Acquired Yamau General Development Co., Ltd., and made it a subsidiary.

February 1968: Changed organization from Yamau Cement Industry Co., Ltd. to Yamau Cement Products Industry Co., Ltd. Factory: Fukuoka Factory

November 1969: Established Miyazaki Factory in Higashimorokata District, Miyazaki Prefecture (now Miyazaki City), started manufacturing small-scale concrete products for roads and agricultural civil engineering.

April 1987: Established Tokyo Sales Office and Osaka Sales Office to expand into Honshu.

May 1970: Established Yamau General Development Co., Ltd. in Fukuoka City, engaged in development, design, construction, and management of concrete products.

June 1990: Established Hamamatsu Factory in Iwata District, Shizuoka Prefecture, and started manufacturing landscape-related products.

April 1992: Merged with Asahi Concrete Industries Co., Ltd., Yamau Trading Co., Ltd., and Yamau General Development Co., Ltd.

November 1993: Established Okayama Factory in Ato District, Okayama Prefecture, and Iwaki Factory in Iwaki City, Fukushima Prefecture, and started manufacturing landscape-related products.

October 1995: Registered as a over-the-counter traded security with the Japan Securities Dealers Association.

October 2000: Obtained ISO9001 certification.

November 2001: Moved headquarters to a new building in Fukuoka City, Fukuoka Prefecture (Sawara Ward).

October 2002: Closed Okayama Factory.

May 2003: As part of business restructuring, withdrew completely from Honshu operations, closed Iwaki Factory, Hamamatsu Factory, and other Honshu offices.

November 2003: Established Yamau Asahi Co., Ltd. in joint venture with Asahi Mesh Industry Co., Ltd.

June 2004: Established Yamau Trust Co., Ltd. (reorganized into Yamau Trust Co., Ltd.) as a manufacturing subcontractor for concrete products.

Listed on the Jasdaq Securities Exchange upon its establishment.

April 2005: Established Neo Trust Co., Ltd., a manufacturing subcontractor for concrete products.

June 2006: Established Pio Co., Ltd. and Pio Tech Co., Ltd. as new business initiatives.

August 2006: Established Kyukon Sales Co., Ltd. (renamed Fukuoka Precon Sales Co., Ltd.) in collaboration with Kyukon Co., Ltd.

April 2007: Yamauto Trust Co., Ltd. and Yamau Asahi Ltd. merged with Yamauto Trust Co., Ltd. as the surviving company.

June 2007: Established Mec Co., Ltd. as a new business initiative.

September 2007: Established Creative Mold Co., Ltd. to manufacture and sell concrete formwork.

January 2008: Acquired Koyo System Equipment Co., Ltd. and made it a subsidiary.

January 2009: Acquired Oita Fuji Co., Ltd. and made it a subsidiary.

March 2009: Sold all shares of Pio Co., Ltd. and Pio Tech Co., Ltd.

April 2010: Listed on the Osaka Securities Exchange (JASDAQ Market) following the merger of JASDAQ Securities Exchange and Osaka Securities Exchange.

October 2010: Established Miyazaki Precon Co., Ltd. and made it a subsidiary.

October 2010: Listed on the Osaka Securities Exchange JASDAQ (Standard) following the integration of the Osaka Securities Exchange Hercules, JASDAQ, and NE markets.

October 2011: Opened the Kanto Business Division in Nihonbashi, Chuo-ku, Tokyo.

April 2012: Acquired Kaisei Industries Co., Ltd. and made it a subsidiary.

July 2012: Opened Kumamoto Sales Office in Kumamoto City, Kumamoto Prefecture.

July 2013: Listed on the Tokyo Stock Exchange JASDAQ (Standard) following the integration of the Tokyo and Osaka Stock Exchanges' spot markets.

December 2013: Established Repair Engine Co., Ltd. and made it a subsidiary.

June 2015: Acquired Daiei Development Co., Ltd. and made it a subsidiary.

October 2016: Established Kumamoto Yamau Co., Ltd.

April 2017: Yamauto Trust Co., Ltd., Yamau Asahi Ltd., and Creative Mold Co., Ltd. merged with Yamauto Trust Co., Ltd. as the surviving company.

April 2019: Absorbed and merged Miyazaki Precon Co., Ltd.

March 2020: Acquired Chugoku Road Co., Ltd. and made it a subsidiary.

April 2021: Changed the company 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.

April 2021: Relocated headquarters to Chuo-ku, Fukuoka City, Fukuoka Prefecture.

April 2022: Transitioned from JASDAQ (Standard) to the Standard Market due to review of market classification by the Tokyo Stock Exchange.

April 2022: Merged Fukuoka Precon Sales Co., Ltd., with Yamau Co., Ltd. as the surviving company.

April 2023: Merged Yamau Co., Ltd., with Yamau Trust Co., Ltd. as the surviving company.

April 2024: Merged Repair Engine Co., Ltd., with Yamau Co., Ltd. as the surviving company.