Carleif Elektro AS - Trondheim

Trondheim Elektro AS - Tiller

Unitek AS - Trondheim

ABK-Qviller AS avd. Trondheim - Trondheim

Rail Infrastructure AS (RIAS) avd. Trondheim - Heimdal

Tore Ligaard AS avd Trondheim - Trondheim

Johan Andresen AS - Trondheim

Trym - Trondheim

Totalsystem Trondheim AS - Tiller

Aas-Jakobsen Trondheim AS - Sluppen