| 1946 |
December |
OSAKA ORGANIC CHEMICAL INDUSTRY LTD. established in Higashinari-ku, Osaka for the production and marketing of Canada balsam and cedar oil. |
| 1947 |
March |
The company starts to produce and market organic solvents and reagents. |
| 1951 |
November |
Tokyo Sub-Branch opened in Koto-ku, Tokyo to strengthen marketing in the Kanto area. |
| 1953 |
December |
Switch from refined reagent products to petrochemical products progresses and the company starts producing acrylic acid. |
| 1955 |
September |
Along with an expansion in the scale of production, Sekime Plant is established in Joto-ku, Osaka. |
| 1958 |
July |
Head Office is moved to Sekime Plant and the latter is integrated with Head Office. |
| 1961 |
July |
Along with an expansion in the scale of production, Head Office and plants are relocated to Kashiwara City in Osaka Prefecture. |
| October |
Osaka Office is established in Higashi-ku (currently Chuo-ku), Osaka to enhance sales activities. |
| 1968 |
October |
Yachiyo Logistics Office is established in Yachiyo City, Chiba Prefecture to boost distribution in the eastern Japan region. |
| 1969 |
April |
SHINKO ORGANIC CHEMICAL INDUSTRY LTD. (currently a consolidated subsidiary) is established, and production of some acetic esters is transferred there. |
| 1981 |
June |
Along with an expansion in the scale of production, Matto Plant (currently Kanazawa Plant) is established in Matto city (currently Hakusan city), Ishikawa Prefecture. |
| 1984 |
June |
Head Office is moved to Higashi-ku (currently Chuo-ku), Osaka and integrated with Osaka Office. |
| 1987 |
July |
The company lists on the 2nd Section of the Osaka Securities Exchange. |
| 1988 |
December |
Related company SANYU CHEMICAL COMPANY LTD. is established via a joint investment and produces methacrylic ester. |
| 1997 |
June |
Matto Plant (currently Kanazawa Plant) acquires ISO 9002 certification. |
| 1999 |
November |
Along with business expansion, land for plant is acquired in Yuza-machi, Akumi-gun, Yamagata Prefecture. |
| 2000 |
July |
Sakata Plant is built in Yuza-machi, Akumi-gun, Yamagata Prefecture and full-fledged operation starts. |
| 2001 |
January |
Kashiwara Plant (currently Osaka Office) acquires ISO 9002 certification. |
| 2003 |
November |
The company expands departments subject to ISO at Head Office, Research & Development Section and the Lab, and acquires ISO 9001 certification. |
| December |
Tokyo Branch is moved and renamed Tokyo Office. |
| 2005 |
February |
Kashiwara Plant is renamed Osaka Plant (currently Osaka Office), and Matto Plant is renamed Kanazawa Plant. |
| November |
The company lists on the 2nd Section of the Tokyo Stock Exchange. |
| December |
Sakata Plant acquires ISO 14001 certification. |
| 2006 |
January |
Kanazawa Plant acquires ISO 14001 certification. |
| 2007 |
November |
Sakata Plant acquires occupational health and safety management system certification (OHSAS18001). |
| 2011 |
December |
The company is appointed to the 1st Section of the Tokyo Stock Exchange. |
| 2012 |
March |
OOC Shanghai Representative Office established in Shanghai, China. |
| 2014 |
January |
Osaka Organic Chemical (Shanghai) Trading Ltd. (currently a consolidated subsidiary) was established in Shanghai, China. |
| December |
OOC Shanghai Representative Office was dissolved in Shanghai, China. |
| 2015 |
December |
Osaka Plant is renamed as Osaka Office. |
| 2018 |
April |
Related company SANYU CHEMICAL COMPANY LTD. is dissolved. |
| 2021 |
June |
Closed Yachiyo office. |
| 2022 |
April |
Listed on Tokyo Stock Exchange Prime Market. |
| 2022 |
October |
Established Korea Office. |
