| October 1968 |
Establishment of Showa Diamond Chemical K.K. (50/50 JV between Showa Denko K.K. and Diamond Shamrock) |
| December 1968 |
Open Yokohama Works |
| September 1969 |
Start Daconil Technical (chlorothalonil) production at Yokohama Works |
| May 1975 |
Open Minori Agricultural Experiment Station in Ibaraki-Prefecture |
| July 1983 |
Transfer of agricultural chemical business from Showa Denko, and changed company name to SDS Biotech K.K. |
| Open Tokyo Research Laboratory in Tokyo |
| August 1983 |
Open Osaka Sales Office, Fukuoka Sales Office and Sapporo Sales Office |
| December 1984 |
Open SDS Biotech K.K. Philippine Representative Office in Manila (currently in Davao City), Philippines |
| March 1985 |
Capital withdrawal of Diamond Shamrock from SDS Biotech |
| June 1986 |
Capital participation of Sandoz Group in SDS Biotech |
| July 1988 |
Open Sendai Sales Office |
| September 1991 |
Open Tsukuba Research & Technology Center (former Tokyo Res. Lab.) in Tsukuba Science City |
| April 1995 |
Open SDS Biotech K.K. Seoul Branch in Seoul, Korea |
| April 1998 |
Showa Denko's acquisition of all the common shares in SDS Biotech owned by Novartis |
| May 2000 |
Showa Denko's acquisition of all the remaining stocks of SDS Biotech (100% subsidiary of Showa Denko) |
| March 2005 |
Separation from Showa Denko by way of management buyout |
| December 2008 |
Listed on JASDAQ Securities Exchange |
| December 2009 |
Listed on Second Section of Tokyo Stock Exchange |
| June 2011 |
Converted to a consolidated subsidiary of Idemitsu Kosan K.K. through the tender offer of shares |
