This document provides an overview of Primoris Services Corporation, a diversified international construction company. It summarizes the company's operating groups in industrial and underground construction, lists its operating locations across the US and internationally, and highlights some of its project experience building power plants, pipelines, refineries, and renewable energy facilities. The company was established in 1946 and has grown significantly over the decades through strategic acquisitions and expansion into new markets.

1. A Diversified InternationalConstruction Company

2. Introduction

3. Primoris Services CorporationPRIMORIS SERVICES CORPORATIONCardinal Contractors, Inc. ARB, Inc.ARB Structures, Inc.Onquest, Inc.Cardinal MechanicalPrimoris Renewable ResourcesOnquest Heaters, Inc.Born Heaters of Canada, Ltd.ARB International LTDARB Ecuador Cia, Ltda.ARB Arendal, S.de R.L. de C.V. 49%

4. History and MilestonesAcquires Harco

5. Develop directional drilling expertise

6. Specializes in designing and supplying high performance furnaces for the oil industry

7. Process engineering and modeling of process plants

8. Furnishes environmental solutions

9. Acquires Oilfield Construction Co. (CA)

10. Expertise in the construction of energy processing facilities

11. Formed basis of the Industrial Group

12. Acquires Macco Constructors, Inc. (CA)

13. Established ARB as the largest pipeline construction company in California

14. Increased presence in Los Angeles basin

15. Energy crisis in late 2000/early 2001

16. Brian Pratt becomes President

17. Grows ARB from a $15mm revenue business in 1983 to the Company’s current size

18. First entry into foreign markets/South America

19. Primoris is formed

20. Rhapsody merger(Public)200819831989199119921993199420062002200420051996200719461960On track to achieve record level of EBITDA and backlog

21. Develops Steel Structure capabilities

22. Separated from Macco-Robertson

23. Separated from Alex-Robertson

24. ARB is incorporated as separate state organization

25. Acquires Cardinal Contractors (FL)

26. Expertise in design/build water/wastewater facilities

27. Establishes footprint in Florida

28. Acquires OFCCO Constructors (CA)