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. At the beginning of 1989 the company was converted into a limited partnership in order to create an improved organizational structure and in preparation for a partnership relationship.

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

Wadsack Sofia Ltd., the company‚Äôs subsidiary in Sofia, Bulgaria, has been in operation since January 1, 1998.

With the take over of Revo Treuhand AG (today Wadsack Solothurn AG), Wadsack AG offers its services also in the Region of Solothurn.

In 2016, Wadsack also opened an office in Schaffhausen.