Ilario Ormezzano was born in 1897 as chemist's in Vallemosso, founded by Cav. Ilario Ormezzano. Later on it turned into a company thanks to the foresight of its founder who expanded the range of initial products towards the needs of the blooming textile market. In subsequent years, the headquarters moved in Biella, a strategic place for the textile industry and Ilario Ormezzano became IOB (Ilario Ormezzano Biella). Then, thanks to the contribution of Mr. Franco Ormezzano, successor of the Cav. Ilario, it has grown continuously  

In 1980 Mr. Giancarlo Ormezzano, Franco's first¬≠ born, assumed the leadership of the company, keeping alive the tradition. He built a new plant in Gaglianico to replace the previous one in Biella, in order to comply with the high standards of safety, quality and eco sustainability.

In 1988, IOB acquired SAI (Industrial Supplying Company founded in 1876) a branch of Montedison, the most important ltalian chemical company of that time; in 2000 the two companies merged, creating the Ilario Ormezzano-SAI.
In 2003 the Company acquired RATTI, a chemical distribution company founded in 1927 and based in Milan.
In 2011, another valuable piece in the evolution of the Company is the acquisition of Pharmaline, a company focused in trading pharmaceutical intermediates and API (Active Pharmaceuticals lngredients).
In the last months of 2013, with the acquisition of Agechim, a 40 years old  chemical company founded in April 1974, was added the last petal of the already existing group.This acquisition allowed the group  to cover other sectors synergistic to its core business in the areas of Galvanic, Resins, Paints and Adhesives.
With this further step toward, the Company Ilario Ormezzano-SAI was able to satisfy a wider share of the Italian market, focusing not only on the pharmaceutical industry and in general on the distribution of basic chemicals and solvents but also on other sector. 
At the beginning of 2016, IOB-SAI continues its acquisition policy, incorporating Siochem Srl.
Deposit initially used for rent and then, at the end of 2016, officially incorporated inside the Group; allowing the Company to strengthen the storage capacity, facilitate logistics management, strengthen the productive part of powder and liquid mixing and, above all, implement the range of processed products.