| 1982: | Joseph Faymonville establishes the firm FAYMONVILLE & PARTNERS. |
| 1987: | Establishment of FAYMONVILLE, YANA and PARTNERS in Brussels, later transformed into GEE. Under Georges Yana and, later, Isabelle Folie, GEE develops into an established tax consultancy firm in Brussels. |
| 1988: | Together with Kurt Leinen, Joseph Faymonville sets up FAYMONVILLE, LEINEN & PARTNERS, trading under the name of “DIE TREUHANDGESELLSCHAFT AG”. |
| 1989: | Establishment of FIDUNORD in Weiswampach/Luxembourg – an important location of the Treuhand Group in the financial centre of Luxembourg. Erwin Schröder becomes partner and director. |
| 1990: | The new firm of ECOLEX takes on the increasingly important area of finance and subsidy consultancy, developing over time into the separate consultancy domain of corporate consultancy for SMEs. |
| 1995: | Establishment of FIDUCIAIRE DE LA TOUR in Namur, capital of the Walloon Region. |
| 1998: | Another firm, EUPENER TREUHANDGESELLSCHAFT, is established in eastern Belgium, ensuring even closer proximity to clients in the north of the German-speaking Community. |
| 2000: | ECOLEX becomes TREUHAND UNTERNEHMENSBERATUNG, subsequently strengthened by managing partner Dr. Daniel Weinbrenner. |
| 2002: | EUPENER TREUHANDGESELLSCHAFT takes over the tax consultancy firm LINCÉ in Heus/Verviers. René Michel becomes director of EUEPNER TREUHANDGESELLSCHAFT. |
| The consultancy operation is expanded to include a payroll secretariat. The duties are performed by FN HERMES. | |
| 2004: | René Michel becomes a partner of EUPENER TREUHANDGESELLSCHAFT and Frederic Callens becomes a partner of FIDUCIAIRE DE LA TOUR in Namur. The TREUHAND ACADEMY, with the CORPORATE DESK department, commences its activities headed by Anja Heyen. |