Subsidiary

Jurisdiction of Organization

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ARB, Inc.

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California

ARB Chile, Ltda.

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Chile

B Comm Constructors, LLC

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Texas

Cardinal Contractors, Inc.

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Florida

Comtrac Services, LLC

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Delaware

Edison Power Constructors, Inc.

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Arizona

Future Infrastructure Holdings, LLC

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Delaware

Future Infrastructure, LLC

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Texas

Future Telecom Purchaser, LLC

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Delaware

James Construction Group, LLC

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Texas

Juniper Rock Corporation

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California

OnQuest, Inc.

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California

OnQuest Canada, ULC (formerly Born Heaters Canada)

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Alberta

OnQuest Heaters, Inc.

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Delaware

PFMG Solar Tustin, LLC

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Delaware

Pipe Jacking Trenchless, Inc.

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California

Pipeworx, Ltd.

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Alberta

PLH Group, Inc.

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Delaware

Premier PV, LLC

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Texas

Pride Utility Construction Co., LLC

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Delaware

Primoris Canada ULC

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British Columbia

Primoris Design & Construction, Inc.

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Delaware

Primoris Distribution Services, Inc.

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Texas

Primoris Electric, Inc.

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California

Primoris Energy Services Corporation

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Texas

Primoris Pipeline, Inc.

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Texas

Primoris Power Line Services, Inc.

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Texas

Primoris Renewable Energy, Inc.

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Texas

Primoris T&D Services, LLC

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Delaware

Q3 Contracting, Inc.

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Minnesota

R.B. Hinkle Construction, Inc.

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Virginia

Rockford Corporation

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Oregon

Rockford Holdings Corporation

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Delaware

Rockford Pipelines Canada, Inc.

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Alberta

Saxon Construction, Inc.

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Texas

Snelson Companies, Inc.

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Washington

Talus Development, LLC

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Arizona

TTRS, Inc.

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California

Vadnais Trenchless Services, Inc.

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California

Willbros Group, Inc.

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Delaware