As filed with the Securities and Exchange Commission on April 29, 1997. Registration No. 333-21399 ================================================================= SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 -------------------------------- POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT under THE SECURITIES ACT OF 1933 --------------------------------- WILLBROS GROUP, INC. (Exact name of registrant as specified in its charter) Republic of Panama 98-0160660 (State or other (I.R.S. Employer jurisdiction of Identification No.) incorporation or organization) Edificio Torre Banco Germanico Calle 50 y 55 Este, Apartado 850048 Panama 5, Republic of Panama (Address, including zip code, of registrant's principal executive offices) ------------------------------------------- Willbros Employees' 401(k) Investment Plan (formerly the Willbros USA, Inc. Employees' Investment Plan) (Full title of the plan) --------------------------------- LARRY J. BUMP Chairman of the Board and Chief Executive Officer Willbros Group, Inc. Edificio Torre Banco Germanico Calle 50 y 55 Este, Apartado 850048 Panama 5, Republic of Panama (50-7) 263-9282 (Name, address, including zip code, and telephone number, includ ing area code, of agent for service) ================================================================= PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT Item 8. Exhibits. The following documents are filed as exhibits to this Registration Statement: 4 Not applicable. 5* Opinion of Arias, Fabrega & Fabrega. 15 Not applicable. 23(a)** Consent of KPMG Peat Marwick. 23(b)** Consent of KPMG Peat Marwick LLP. 23(c)* Consent of Arias, Fabrega & Fabrega (included in Exhibit 5). 24** Power of Attorney. 99 Not applicable. The opinion of counsel contemplated by Item 601(b)(5)(i) of Regulation S-K is being filed only with respect to shares of Common Stock being registered which may be original issue shares. In lieu of the opinion of counsel or determination letter contemplated by Item 601(b)(5)(ii) of Regulation S-K, the registrant hereby confirms that it has submitted the Plan and undertakes that it will submit all amendments thereto to the Internal Revenue Service (the "IRS") in a timely manner, and that it has made or will make all changes required by the IRS in order to qualify the Plan under Section 401 of the Internal Revenue Code. - ------------------------- * Filed herewith. ** Previously filed with this Registration Statement on February 7, 1997. * * * II-1 SIGNATURES THE REGISTRANT. Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Post- Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Panama City, Republic of Panama on the 28th day of April, 1997. WILLBROS GROUP, INC. By: /s/ Larry J. Bump ----------------------------- Larry J. Bump Chairman of the Board and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment No. 1 to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated: Signature Title Date - -------------- ------ ------ /s/ Larry J. Bump Director, Chairman of April 28, 1997 - ------------------ the Board and Chief Larry J. Bump Executive Officer (Principal Executive Officer and Authorized Representative in the United States) /s/ Melvin F. Spreitzer Director, Executive April 28, 1997 - ------------------------ Vice President, Chief Melvin F. Spreitzer Financial Officer and Treasurer (Principal Financial Officer and Principal Accounting Officer) Guy E. Waldvogel* Director April 28, 1997 - ---------------------- Guy E. Waldvogel Bryan H. Lawrence* Director April 28, 1997 - ----------------------- Bryan H. Lawrence Peter A. Leidel* Director April 28, 1997 - --------------------- Peter A. Leidel John H. Williams* Director April 28, 1997 - ---------------------- John H. Williams II-2 Signature Title Date - --------- ----- ----- - ------------------ Director April, 1997 Michael J. Pink *By: /s/ Larry J. Bump ------------------- Larry J. Bump Attorney-in-Fact THE PLAN. Pursuant to the requirements of the Securities Act of 1933, the Plan has duly caused this Post-Effective Amendment No. 1 to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Tulsa, State of Oklahoma on the 28th day of April, 1997. Willbros Employees' 401(k) Investment Plan (formerly Willbros USA, Inc. Employees' Investment Plan) By: /s/ Melvin F. Spreitzer ------------------------ Melvin F. Spreitzer Retirement Plans Committee II-3 INDEX TO EXHIBITS Exhibit Number Description of Document ------- ----------------------- 4 Not applicable. 5* Opinion of Arias, Fabrega & Fabrega. 15 Not applicable. 23(a)** Consent of KPMG Peat Marwick. 23(b)** Consent of KPMG Peat Marwick LLP. 23(c)* Consent of Arias, Fabrega & Fabrega (included in Exhibit 5). 24** Power of Attorney. 99 Not applicable. - ------------------------- * Filed herewith. ** Previously filed with this Registration Statement on February 7, 1997.