| Year |
Sites and branches |
| 1933 |
Establishment of the engineering firm Eduard Holinger, Spitzackerstrasse 17 in Liestal |
| 1945 |
Branch office opened at Bachstrasse 20 in Aarau |
| 1950 |
Branch office opened at Militärstrasse 94 in Zurich |
| 1956 |
Branch office opened at Mühlemattstrasse 62 in Bern |
| 1967 |
The firm is taken over by Motor Columbus Ingenieure AG and becomes a joint-stock company |
| 1983 |
Branch office opened in Olten |
| 1988 |
Laboratory for environmental analysis opened in Aarau |
| 1989 |
Branch office opened in Baden |
| 1992 |
Branch office opened in Lucerne |
| 1993 |
Basel office opened |
| 1994 |
Fusion with Geologisches Institut Dr. Schmassmann AG |
| 1996 |
Establishment of HOLINGER SA, Luxembourg |
| 2000 |
Management buyout |
| 2002 |
Holding acquired in aqua-System AG, Winterthur |
| 2002 |
Lausanne office opened |
| 2002 |
Establishment of HOLINGER Ingenieure GmbH, Hohentengen |
| 2003 |
Zurich branch office moves to Winterthur |
| 2003 |
Schwyz branch office opened |
| 2004 |
The environmental analysis laboratory is outsourced and ENVILAB AG, Zofingen, is established |
| 2007 |
Fusion with Künzler & Partner AG, Lucerne and WSA Ingenieure und Planer AG, Zurich |
| 2007 |
Frick office opened |
| 2008 |
Dornach office opened |
| 2008 |
Frauenfeld office opened |
| 2009 |
Küsnacht office opened |
| 2010 |
Establishment of HOLINGER IC |
| 2010 |
Takeover of Steinle Ingenieure GmbH, Germany |
| 2011 |
Takeover of H-Geol, Oberhofen BE |
