Hans Wadsack started his company as a sole proprietorship on July 1, 1983. A commitment to provide an exceptional service as well as a healthy economy enabled the fledgling enterprise to achieve steady growth.

In June 2018, the limited partnership was converted into a public limited Company. 

With the take over of Revo Treuhand AG (today Wadsack Solothurn AG), Wadsack AG offers its services also in the Region of Solothurn. In January 2019 we opend in Grenchen our second office in in the canton of Solothurn. 

In 2016, WADSACK also opened an office in Schaffhausen.