| NIR-DEM A/S CVR 10466482 | BoardBoard of Directors | 2004 – 2010 | — | Dissolved |
| ABRAHAMSEN & NIELSEN A/S. RÅDGIVENDE INGENIØRER CVR 14669213 | BoardBoard of Directors | 1969 – 2003 | — | Dissolved |
| RÅDGIVENDE INGENIØRFIRMA M.A.I. EJNER LARSEN ApS CVR 16682977 | BoardBoard of Directors | 2006 – 2013 | — | Dissolved |
| NIRAS PROPERTY A/S CVR 26127025 | BoardBoard of Directors | 2004 – 2013 | — | Active |
| HABITAT A/S CVR 18387409 | BoardBoard of Directors | 1994 – 2000 | — | Dissolved |
| NIRAS INTERNATIONAL A/S CVR 19296075 | BoardBoard of Directors | 2004 – 2009 | — | Dissolved |
| NIRAS KONSULENTERNE A/S CVR 20940395 | BoardBoard of Directors | 2004 – 2009 | — | Dissolved |
| DYBBRO & HAASTRUP ApS CVR 21076805 | BoardBoard of Directors | 2005 – 2005 | — | Dissolved |
| EXPLORA A/S CVR 24205002 | BoardBoard of Directors | 2008 – 2009 | — | Dissolved |
| Udviklingsselskabet Frederikssund ApS CVR 40151672 | BoardBoard of Directors | 2021 – 2021 | — | Active |
| NIR-PEN A/S CVR 14123903 | BoardBoard of Directors | 2005 – 2013 | — | Active |
| KOMPLEMENTARSELSKABET NJALSGADE ApS CVR 28892772 | ManagementManagement | 2005 – 2007 | — | Dissolved |
| NJALSGADE K/S CVR 28895909 | ManagementChief Executive Officer | 2005 – 2006 | — | Active |
| BG STONE A/S CVR 29010331 | ManagementManagement | 2005 – 2005 | — | Active |
| Projekt Egedal By A/S CVR 38360884 | BoardBoard of Directors | 2017 – 2017 | — | Active |
| NIRAS Fonden CVR 11647308 | BoardBoard of Directors | 2010 – 2014 | — | Active |
| B2B PROPERTY ApS CVR 17205692 | BoardBoard of Directors | 2018 – 2019 | — | Active |
| NIRAS GREENLAND A/S CVR 87672328 | BoardBoard of Directors | 2004 – 2017 | — | Active |
| NIR-HART ApS RÅDGIVENDE INGENIØRER CVR 48457819 | BoardBoard of Directors | 2006 – 2006 | — | Dissolved |
| AKTIESELSKABET PLANUM INTERNATIONAL LTD CVR 66293610 | BoardBoard of Directors | 1980 – 1996 | — | Dissolved |
| MULTI MEDIA CONSULTING A/S CVR 78589728 | ManagementManagement | 2011 – 2017 | — | Dissolved |
| BATTERIET K/S CVR 30569725 | BoardBoard of Directors | 2007 – 2008 | — | Active |
| SINDING GRUPPEN A/S CVR 27291082 | BoardBoard of Directors | 2012 – 2018 | — | Active |
| URBAN RIGGER ApS CVR 36391340 | BoardBoard of Directors | 2014 – 2017 | — | Active |
| NIRAS IPR A/S CVR 53619215 | BoardBoard of Directors | 2004 – 2013 | — | Active |
| NIRAS A/S CVR 37295728 | BoardBoard of Directors | 2004 – 2017 | — | Active |
| NIRAS GRUPPEN A/S CVR 73432219 | BoardBoard of Directors | 2010 – 2016 | — | Active |
