| 2008 | Integration of 87 local companies - among them Ernst & Young Switzerland - in Europe, Middle East, India and Africa (EMEIA area) |
| 2002 | Ernst & Young (Switzerland) combines activities with Andersen (Switzerland) |
| 2000 | ATAG Ernst & Young renamed to Ernst & Young Sale of Management Consulting activities |
| 1998 | Equity Partnership |
| 1992 | Merger ATAG Ernst & Young with GBR / Neutra |
| 1991 | Change of the name from ATAG Allgemeine Treuhand AG to ATAG Ernst & Young |
| 1989 | Ernst & Whinney merges with Arthur Young |
| 1960 | Beginn of the cooperation between ATAG and Arthur Young |
| 1917 | Formation of “Allgemeine Treuhand AG (ATAG)” in Basel |
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