| 1963-10 |
Established Yamau Concrete Industry Co., Ltd. in Shimabara City, Nagasaki Prefecture, and commenced design, manufacturing, and sales of various secondary concrete products. |
| 1963-10-10 |
Established Yamau Concrete Industry Co., Ltd. in Shimabara City, Nagasaki Prefecture, and commenced business of designing, manufacturing, and selling various concrete secondary products. |
| 1963-10-10 |
Established Yamau Concrete Industry Co., Ltd. in Shimabara City, Nagasaki Prefecture on October 10, 1963, and commenced business of designing, manufacturing, and selling various concrete secondary products. |
| 1964-02 |
Established Shimabara Plant in Kokumi Town, Nankakari District (now Unzen City), Nagasaki Prefecture. |
| 1967-08 |
Established Matsubashi Plant in Matsubashi Town, Shimomashiki District (now Uji City), Kumamoto Prefecture. |
| 1967-11 |
Moved headquarters to Kokumi Town, Nankakari District (now Unzen City), Nagasaki Prefecture. |
| 1973-09 |
Established Ogawa Plant in Ogawa Town, Shimomashiki District (now Uji City), Kumamoto Prefecture. |
| 1979-07 |
Established Saitama Plant in Hanyu City, Saitama Prefecture. |
| 1981-08 |
Established Sasebo Plant in Yoshii Town, Kitamatsuura District (now Sasebo City), Nagasaki Prefecture. |
| 1989-01 |
Established Nagasu Plant in Nagasu Town, Tamana District, Kumamoto Prefecture. |
| 1990-07 |
Moved headquarters to Kumamoto City, Kumamoto Prefecture. |
| 1991-09 |
Changed company name to Yamax Co., Ltd. |
| 1993-10 |
Established Setaka Plant in Setaka Town, Yamamoto District (now Miyama City), Fukuoka Prefecture. |
| 1995-11 |
Registered shares with the Japan Securities Dealers Association. |
| 1997-11 |
Established Minato Building Materials Co., Ltd. (consolidated subsidiary). |
| 2004-12 |
Cancelled registration with the Japan Securities Dealers Association and listed shares on the JASDAQ Securities Exchange. |
| 2006-05 |
Established Fukuoka Yamax Co., Ltd. (now a consolidated subsidiary). |
| 2010-04 |
Listed shares on the Osaka Securities Exchange JASDAQ market following the merger of the JASDAQ and Osaka Stock Exchanges. |
| 2011-08 |
Established Hitoyoshi Plant in Sagara Village, Kuma District, Kumamoto Prefecture. |
| 2012-03 |
Acquisition of shares of Tone GeoTech Inc. (now Tohoku Yamax Co., Ltd., a consolidated subsidiary). |
| 2012-04 |
Oogawa Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association: Saitama Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association. |
| 2012-04 |
Oogawa Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association: Saitama Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association. |
| 2012-04 |
Oogawa Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association, Saitama Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association. |
| 2013-04 |
Established HOC Yamax Co., Ltd. (affiliate) in Sasebo City, Nagasaki Prefecture through joint investment with H.O.C. Co., Ltd. (Omura City, Nagasaki Prefecture). |
| 2013-07 |
Shares listed on the Tokyo Stock Exchange JASDAQ (Standard) following the merger of the Tokyo Stock Exchange and Osaka Stock Exchange. |
| 2014-04 |
Absorbed and merged with Minato Building Materials Co., Ltd. (consolidated subsidiary). |
| 2016-04 |
Nagasawa Plant: PC component quality certification (N certification) obtained (Society) Prefabricated Building Association. |
| 2020-04 |
Made HOC Yamax Co., Ltd. a consolidated subsidiary. |
| 2022-04 |
Transitioned from the JASDAQ market to the Standard market of the Tokyo Stock Exchange due to a review of market classifications. |
