X0303 4 2009-03-12 0 0001449732 Willbros Group, Inc.\NEW\ WG 0001237702 DALTON JOHN T 4400 POST OAK PARKWAY SUITE 1000 HOUSTON TX 77027 0 1 0 0 Sr.Vice Pres. and Gen. Counsel Common Stock 2009-03-12 4 A 0 5000 0 A 103816 D Common Stock 4232 I 401(k) Plan The information is based on a plan statement dated as of January 19, 2009. On March 3, 2009, Willbros Group, Inc., a Delaware corporation ("Willbros Delaware"), became the successor issuer of Willbros Group Inc., a Republic of Panama corporation ("Willbros Panama"), pursuant to a merger whereby Willbros Merger, Inc., a Delaware corporation and wholly-owned subsidiary of Willbros Delaware, was merged with and into Willbros Panama, with Willbros Panama continuing as the surviving entity and becoming a wholly-owned subsidiary of Willbros Delaware. As a result of the merger, each holder of Willbros Panama common stock received the identical number and percentage of the outstanding shares of the common stock of Willbros Delaware as they owned of Willbros Panama immediately prior to the merger. Dennis G. Berryhill, Attorney-in-fact for John T. Dalton 2009-03-16