| November, 1903 |
Chojiro Ozeki established dyes and Japanese & Chinese medicine wholesale business in Komagata, Taito-ku, Tokyo. |
| October, 1943 |
Zenshiro Ozeki took over the business following the death of his predecessor. |
| December, 1948 |
Established corporation named "Zenshiro Ozeki Store, Ltd.", capitalized at ¥ 1 million. |
| March, 1959 |
Opened Osaka Branch in Osaka City. |
| August, 1965 |
Changed organization of business into a company.
Renamed business "Ozeki Co., Ltd.", and increased capital to ¥ 22 million. |
| January, 1968 |
Opened Fukuoka Sales Office in Hakata-ku, Fukuoka City. |
| August, 1969 |
Established Tsukuba Chemicals Plant, Ltd. in Inashiki-gun, Ibaraki, as a plant dedicated to the chemical engineering and mixing of pigments. |
| January, 1978 |
Increased capital to ¥ 55 million. |
| November, 1980 |
Zenshiro Ozeki appointed to Chairman, Yoshitaka Ozeki to President. |
| January, 1982 |
Moved Ozeki Distribution Center from Itabashi-ku, Tokyo to Kawaguchi City, Saitama. |
| April, 1983 |
Opened Nagoya Sales Office. |
| December, 1983 |
Increased capital to ¥ 88 million. |
| July, 1988 |
Moved head office building to current location. |
| December, 1988 |
Moved Osaka Branch to Chuo-ku. |
| April, 1989 |
Opened Hirakata Distribution Center in Hirakata City, Osaka. |
| December, 1989 |
Renamed Tsukuba Chemicals Plant, Ltd. to "Tsukuba Techs Co., Ltd.", capitalized at ¥ 20 million. |
| April, 1991 |
Opened Nagano Sales Office. |
| October, 1991 |
Opened Tohoku Sales Office in Koriyama City, Fukushima. |
| May, 1992 |
Opened Hiroshima representative office. |
| July, 1993 |
Opened Shikoku representative office. |
| June, 1994 |
Opened Morioka representative office. |
| November, 1994 |
Opened Hokuriku representative office. |
| April, 1998 |
Moved Tohoku Sales Office to Sendai City, and renamed it Sendai Sales Office. |
| September, 2000 |
Closed Hokuriku representative office. |
| August, 2001 |
Established Ozeki (Hong Kong) Co., Ltd. |
| November, 2001 |
Closed Morioka representative office. |
| April, 2002 |
Awarded certification for environmental management system IS014001. |
| November, 2002 |
Yoshitaka Ozeki appointed to Chairman, Ryutaro Ozeki to President. |
| September, 2003 |
Spun off Landscape Division and established View Planning Co., Ltd., a joint venture with Tokai Rubber Industries, Ltd. |
| October, 2003 |
Closed Sendai Sales Office, Hiroshima representative office and Shikoku representative office in conjunction with launch of operations of View Planning Co., Ltd. |
| September, 2009 |
Closed Ishikawa Plant of Tsukuba Techs Co., Ltd. |
