Nature of Business (Tables)

12 Months Ended

Dec. 31, 2017

Nature of Business

Schedule of list of primary operating subsidiaries and their reportable segment

Business Unit	Reportable Segment	Prior Reportable Segment
ARB Industrial (a division of ARB, Inc.)	Power	West
ARB Structures	Power	West
Primoris Power (formerly PES Saxon division)	Power	Energy
Primoris Renewable Energy (a division of Primoris AV)	Power	Energy
Primoris Industrial Constructors (formerly PES Industrial Division)	Power	Energy
Primoris Fabrication (a division of PES)	Power	Energy
Primoris Mechanical Contractors (a combination of a division of PES and Cardinal Contractors)	Power	Energy
OnQuest	Power	Energy
OnQuest Canada	Power	Energy
Primoris Design and Construction (“PD&C”); created 2017	Power	NA
Rockford Corporation (“Rockford”)	Pipeline	West
Vadnais Trenchless Services (“Vadnais Trenchless”)	Pipeline	West
Primoris Field Services (a division of PES Primoris Pipeline)	Pipeline	Energy
Primoris Pipeline (a division of PES Primoris Pipeline)	Pipeline	Energy
Primoris Coastal Field Services; created 2017	Pipeline	NA
ARB Underground (a division of ARB, Inc.)	Utilities	West
Q3 Contracting (“Q3C”)	Utilities	West
Primoris AV	Utilities	Energy
Primoris Distribution Services ("PDS"); created 2017	Utilities	NA
Primoris Heavy Civil (formerly JCG Heavy Civil Division)	Civil	East
Primoris I&M (formerly JCG Infrastructure & Maintenance Division)	Civil	East
Primoris Build Own Operate	Civil	East