| Jun 1939 |
Started manufacturing industrial chemicals |
| Dec 1943 |
Changed the corporate name to "YONEYAMA YAKUHIN KOGYO Co., Ltd. |
| Jun 1960 |
Started manufacture of amino acid in Mikuni plant, Osaka |
| Oct 1961 |
Opened Tokyo branch office |
| Jun 1965 |
Opened Ueda branch office in Nagano |
| Mar 1966 |
Opened Nagoya branch office |
| Mar 1968 |
Opened Hiroshima branch office |
| Oct 1989 |
Moved Nagoya branch to a new office |
| May 1991 |
Completed a new L-Leucine plant in Mikuni |
| Oct 1991 |
Mikuni plant registered FDA & DMF for L-Leucine |
| Nov 1996 |
Built a new Ueda branch office |
| Mar 1999 |
Moved Tokyo branch to a new office |
| Feb 2002 |
Mikuni plant obtained ISO9001 certification |
| Dec 2005 |
Completed a new amino acid plant in Mikuni |
| May 2006 |
Moved Hiroshima branch to a new office |
| Dec 2007 |
Obtained ISO14001 certification |
