EXHIBIT 10.4 THIRD AMENDMENT AND WAIVER THIS THIRD AMENDMENT AND WAIVER (this "Amendment") dated as of November 23, 2005 (the "Amendment Effective Date"), is by and among Willbros Group, Inc., a Republic of Panama corporation (herein referred to as...Willbros Group Inc • December 23rd, 2005 • Oil & gas field services, nec • New York
EXHIBIT 10.3 WILLBROS GROUP, INC. 6.5% CONVERTIBLE SENIOR NOTES DUE 2012 REGISTRATION RIGHTS AGREEMENTRegistration Rights Agreement • December 23rd, 2005 • Willbros Group Inc • Oil & gas field services, nec • New York
OF 6.5% CONVERTIBLE SENIOR NOTES DUE 2012Indenture • December 23rd, 2005 • Willbros Group Inc • Oil & gas field services, nec • New York
RECITALSPurchase Agreement • December 23rd, 2005 • Willbros Group Inc • Oil & gas field services, nec • New York
EXHIBIT 10.5 FOURTH AMENDMENT AND WAIVER This Fourth Amendment and Waiver (this "Amendment") dated as of December 21, 2005, is by and among Willbros Group, Inc., a Republic of Panama corporation (herein referred to as the "Company") and the Designated...Fourth Amendment and Waiver • December 23rd, 2005 • Willbros Group Inc • Oil & gas field services, nec • New York
