The founder Tokichi OKUNO established OKUNO Toh Shoten and dealt in industrial chemicals.

Seiroku OKUNO took over the organization and changed OKUNOsei Shoten to become a wholesaler.
Became the first company in Japan to successfully manufacture baking powder

Constructed a plant at Joto-ku, Osaka, and started manufacturing and sales of industrial chemicals.

Incorporated OKUNOsei Shoten & Co., Ltd. from a private organization.

Constructed Plant No.1.

Incorporated and reorganized into OKUNO Chemical Industries Co., Ltd. with the capital of JPY 600,000

Started selling colors for ceramic wares

Started manufacturing and selling fatty buffing compounds

Started manufacturing and sales of glass enamels for firing

Increased capital to JPY 1,500,000.
Opened Tokyo Branch.

Start manufacturing,, selling brighteners and related products for plating

Increased capital to JPY 30,000,000

Developed emulsifiers for cake, and started manufacturing and selling

Developed improves for noodles, started manufacturing and selling

Developed low melting point glass, started manufacturing and selling

Increased capital to JPY 50,000,000

Established joint venture company OKUNO ENGINEERING (H.K.)　LTD. in Hong Kong
Increased capital to JPY 70,000,000

Moved head office to its present location

Opened R&D center for Inorganic Materials Dept.

Opened R&D center for Metal Finishing Dept.

Increased owned capital at OKUNO ENGINEERING (H.K.) LTD. to 100%

Opened R&D center for Food Dept.

Opened new center for Inorganic Materials Dept.
Acquired ISO14001 certification for Hanaten Plant No.1, Plant No.2 and Plant No.3.

Acquired ISO 14001 certification for all the facilities of OKUNO

Acquired ISO 9001:2000 certification for all the facilities of OKUNO

Published 100 years anniversary memorial book "Thoughts - Progress for 100 years" in commemoration of 100^th anniversary since the establishment of OKUNO Shoten

Opened Plant No.5（for Food Dept.)

Established OKUNO-AUROMEX (THAILAND) CO., LTD.

Established OKUNO-AUROMEX (VIETNAM) CO., LTD.

Established OKUNO SHANGHAI TECHNOLOGY LTD.
Established OKUNO KOREA CO., LTD. in Seoul
Established HANATEN administration building
Established OKUNO International Corporation in Michigan, USA

Established OKUNO ASIA (THAILAND) CO., LTD. in Bangkok.

Established OKUNO (EU) OFFICE in Germany

Established OKUNO (THAILAND) CO., LTD.
Opened Advanced Technology Research Center

Changed OKUNO-AUROMEX （THAILAND）CO., LTD. to Auromex Co., Ltd. as agency
Changed OKUNO-AUROMEX （VIETNAM）CO., LTD. to Auromex Vietnam Co., Ltd. as agency
Opened Hanaten Physical Distribution Center
Established OKUNO TAIWAN CO., LTD.

Close OKUNO (EU) OFFICE

Opened Quality Assurance Center and Cafeteria

Started the manufacturing Halal certified products in Factory No.5 (Food)

Strengthened supply chain of surface treatment and plating chemicals for semiconductors and electronics
Started the operation of iCUBE (an environmentally friendly next-generation plant)