Significant Willbros Common Stock Shareholder Makes In-Kind Distribution

| Source: Willbros United States Holdings, Inc.

HOUSTON, July 17, 2017 (GLOBE NEWSWIRE) -- Willbros Group, Inc. (NYSE:WG) reported today that InfrastruX Holdings, LLC, who had owned 8,143,965 of Willbros’ common shares, filed a Schedule 13D amendment with the U.S. Securities and Exchange Commission after the market close on Friday, July 14, 2017.  In the amendment, InfrastruX announced that on July 12, 2017, it had disposed of an aggregate of 8,083,235 shares of Willbros common stock for no consideration in a distribution-in-kind to the partners of Tenaska Power Fund, L.P.  InfrastruX Holdings, LLC became a significant stockholder of Willbros in July 2010 when Willbros acquired InfrastruX Group, Inc. and entered the services market for electric transmission and distribution infrastructure. 

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Willbros is a specialty energy infrastructure contractor serving the oil and gas and power industries with offerings that primarily include construction, maintenance and facilities development services. For more information on Willbros, please visit our web site at

Stephen W. Breitigam
VP Investor Relations