1918
Foundation of Ostschweizerische Treuhand-Gesellschaft AG in St. Gall by Eduard Egli, a pioneer and authority of the Swiss auditing, initiator and co-founder of the Association of Swiss Bookkeeping, the predecessor of today’s EXPERTsuisse.
1928
Opening of a branch office in Zurich
1939
Participation in the national exhibition “debit and credit”
1965
Opening of a branch office in Herisau
1980
Bruno Looser joined the Ostschweizerische Treuhand-Gesellschaft AG
1986
Spin-off of the branch office Herisau
1992
Spin-off of the branch office Zürich
1994
Foundation of OTG Ostschweizerische Revisionsgesellschaft AG in St. Gall
Assumption of the existing auditing mandates from the 1918 founded Ostschweizerischen Treuhand-Gesellschaft AG
2011
Renaming in Ostschweizerische Revisionsgesellschaft AG
2015
Take over 100% of the shares of Ostschweizerische Revisionsgesellschaft AG by Philipp Looser
2016
Foundation of Ostschweizerische Revisionsgesellschaft AG in Vaduz
