1945 Establisment of Wettstein Trust by the ex-tax commissioner of the municipality of Küsnacht, Ewald Wettstein. Main areas of expertise: Tax consulting and bookkeeping services.
1982 Son André Wettstein takes over management and a majority of the shares of the company.
1996 Following the death of André Wettstein, the company is acquired by Göldi Grimm Meier & Partner AG. Further development of activities in the fields of legal and tax consulting as well as auditing services.

Expansion of legal and tax consulting and auditing activities.

1997 Further development of the real estate department with focus on management and sale of properties. The firm buys the buliding at Untere Dorfstrasse 14 in Küsnacht.
1999 Wettstein Treuhand and Göldi Grimm Meier & Partner AG are formally merged.
2009 Certification ISO 9001-2008 quality management
2014 Rebranding to ggm+partner