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2021
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Integration of all the employees of WETZEL + PARTNER Ingenieurgesellschaft mbH, Moers
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2021
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Stuttgart office opened
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2020
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Acquisition of WETZEL + PARTNER Ingenieurgesellschaft mbH, Germany
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2019
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Hausach office opened, Germany
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2019
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Acquisition of Cometti Ingegneria SAGL, Besazio (Mendrisio)
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2019
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Acquisition of HOL-ING Planungs- und Beteiligungsgesellschaft mbH, Hamburg and Berlin
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2019
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Stallikon office opened
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2018
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Acquisition of CERT Ingénierie SA, Sion and Martigny
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2018
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Participation WETZEL + PARTNER Ingenieurgesellschaft mbH, Germany
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2018
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Mendrisio office opened
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2017
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Chur office opened
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2016
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Acquisition of TK Consult AG, Zurich
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2015
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Trier office opened
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2015
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Acquisition of share majority of IBG AG, Volketswil
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2014
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Dresden office opened
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2013
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Hünenberg (Zug) office opened
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2013
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Integration of all the employees of Spring Ingenieure AG, Thun
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2012
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Chemnitz office opened
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2012
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Merger of the companies Steinle Ingenieure GmbH and HOLINGER Ingenieure GmbH into HOLINGER Ingenieure GmbH, Germany
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2011
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Sole proprietorship H-Geol, Oberhofen Berne acquired
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2010
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Transfer of employees of the sewage Treatment plant Steinle Process Technology GmbH and founding of Steinle Ingenieure GmbH, Germany
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2010
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HOLINGER IC founded
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2009
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Küsnacht office opened
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2008
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Frauenfeld office opened
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2007
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Frick office opened
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2007
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Fusion of Künzler & Partner AG, Lucerne and WSA Ingenieure und Planer AG, Zurich
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2004
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Outsourcing environmental analysis laboratory and founding ENVILAB AG, Zofingen
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2003
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Schwyz office opened
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2003
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Zurich branch office moves to Winterthur
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2002
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HOLINGER Ing GmbH, Hohentengen founded
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2002
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Lausanne office opened
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2002
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Participation aqua-System AG, Winterthur
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2000
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Management Buy Out
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1996
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HOLINGER SA, Luxembourg founded
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1994
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Merger with Geological Institute Dr. Schmassmann AG
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1993
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Basel office opened
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1992
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Lucerne branch opened
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1989
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Baden branch opened
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1988
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Environmental analysis laboratory in Aarau founded
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1983
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Olten office opened
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1967
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Acquisition by Motor Columbus Ingenieure AG and conversion to joint-stock Company
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1956
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Berne branch opened
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1950
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Zurich branch opened
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1945
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Aarau branch opened
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1933
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Ingenieurbüro E. Holinger, Liestal founded
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