Primoris traces its roots to 1960, when it was founded as ARB, Inc. in Bakersfield, California. Over the decades, it evolved through reorganizations and acquisitions—officially adopting the Primoris identity in the early 2000s and consolidating multiple specialty contractors under its umbrella. The company went public and expanded its footprint via strategic acquisitions, including James Construction Group, Rockford Corporation, Sprint Pipeline Services, Q3 Contracting, and notably Willbros Group in 2018. Through these moves, Primoris assembled a broader national and cross-sector presence.
In its current operations, Primoris acts as a specialty construction and infrastructure firm serving utilities, energy, water/wastewater, and related infrastructure markets. Within “Utilities,” it installs, maintains, and upgrades natural gas distribution systems, electric transmission and distribution systems, and communication networks. In the “Energy / Renewables & Infrastructure” domain, it undertakes pipeline construction and maintenance, facility work, retrofits, and other large capital projects for petrochemical, renewable energy, and infrastructure clients. The acquisition of Willbros extended its capabilities further into oil & gas and power infrastructure contracting.
Positioned as a versatile specialty contractor, Primoris seeks to be a go-to partner for complex infrastructure, energy, and utility clients who require technical depth, national reach, and an ability to deliver across multiple disciplines. By combining legacy utility work with energy infrastructure capabilities and pursuing growth via acquisitions, it hedges exposure to cyclical segments while leveraging synergies across its operating base. Over time, its scale, diversified service offerings, and integrated project execution capability help it compete with both niche specialists and larger EPC players.