AES Panama, S.A.
AMERSCO, Inc.
Beaubois
Black & Veatch Corporation
Centex Corporation
Chicago Bridge & Iron Company
Clark Construction Group, LLC
Coken Electrical
Contra Costa Electric
Ebasco
EMCOR Group, Inc.
Fluor Corporation
Healy Construction Services, Inc.
Helman Hurley Charvat Peacock 
  Architects, Inc.
Hensel Phelps Construction Co.
Herzog Contracting Corp.
Hitachi America, Ltd
Howard Hughes Corporation
Hunt Construction Group
Impreglio S.p.A.
Incisa
KAJIMA Corporation
KBR
Kimley-Horn and Associates, Inc.
KiSKA Construction Corporation
Marelich Mechanical
Modern Continental, Inc.
Morganti Group, Inc.
Morse Diesel
MWH Global
NORESCO
Parsons Brinckerhoff
Peter Kiewit Sons’, Inc.
Recchi America
Robbins Company, The
Samwhan Corporation
San Jose Construction
Shaw Group Inc., The
Siemens AG
Washington Group International
White Construction Group