On July 1, 1983, Hans Wadsack laid the foundation for what has become a leading company in fiduciary and tax consulting with the establishment of the sole proprietorship “Hans Wadsack, Fiduciary and Tax Consulting Office” in Zug. By 1989, the business evolved into the limited partnership wadsack & co. treuhandgesellschaft, setting the stage for future growth.
In the following years, we continuously expanded our expertise and market position:
With the transformation into a public limited company in May 2018 and the successful succession planning of Hans Wadsack, we laid the foundation for today’s Wadsack Zug AG. During this restructuring, our previous subsidiaries were integrated, allowing us to operate under one strong brand name, WADSACK.
Our Strength by the Numbers
For over four decades, WADSACK has stood for competence, reliability, and innovative solutions—your partner for sustainable business success!
Such an agreement is particularly useful for companies with multiple shareholders – for example, family businesses, start-ups, or joint ventures. It creates clear rules where the law leaves room for interpretation and prevents uncertainty or conflict.
We were honored by BILANZ business magazine as one of the “Top Tax Experts & Trustees 2026”!
A shareholders’ agreement is a private contract between the shareholders of a company in which they agree on certain rights and obligations relating to their shares. Its aim is to regulate the relationship among shareholders and to secure stability and control within the company.
Such an agreement is particularly useful for companies with multiple shareholders – for example, family businesses, start-ups, or joint ventures. It creates clear rules where the law leaves room for interpretation and prevents uncertainty or conflict.
We were honored by BILANZ business magazine as one of the “Top Tax Experts & Trustees 2026”!
