As filed with the Securities and Exchange Commission on October 17, 2000 Registration No. 33-86310 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ____________________ Post-Effective Amendment No. 1 To Form S-3 REGISTRATION STATEMENT Under THE SECURITIES ACT OF 1933 ____________________ VASTAR RESOURCES, INC. (Exact name of registrant as specified in its charter) Delaware 95-4446177 (State or other jurisdiction (I.R.S. Employer of incorporation or organization) Identification No.) 15375 Memorial Drive Houston, Texas 77079 (281) 584-6000 (Address, including zip code, and telephone number, including area code, of registrant's principal executive office) David H. Welch President VASTAR RESOURCES, INC. 15375 Memorial Drive Houston, Texas 77079 (212)584-6000 (Name, address, including zip code, and telephone number, including area code, of agent for service) with copies to: Benjamin F. Stapleton, Esq. SULLIVAN & CROMWELL 125 Broad Street New York, New York 10004 Approximate Date Of Commencement Of Proposed Sale To The Public: Not Applicable. If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, check the following box. [_] If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. [_] If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act statement number of the earlier effective registration statement for the same offering. [_] If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box. [_] DEREGISTRATION OF UNSOLD SECURITIES All debt securities registered under the Registration Statement on Form S-3 of Vastar Resources, Inc. (the "Company"), Registration No. 33-86310 (the "Registration Statement"), filed with the Securities and Exchange Commission (the "Commission") on November 14, 1994 that remain unsold are hereby deregistered, in accordance with an undertaking made by the Company in the Registration Statement to remove from registration, by means of a post-effective amendment, any debt securities which remain unsold under the Registration Statement. On September 26, 2000, the Company filed a Certification and Notice of Termination of Registration on Form 15 with the Commission with respect to the debt securities that have been issued under the Registration Statement. SIGNATURES 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-3 and has duly caused this Post-Effective Amendment No. 1 to this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, state of Texas, on this 17th day of October, 2000. VASTAR RESOURCES, INC. By: /s/ David H. Welch ------------------------ Name: David H. Welch Title: President Pursuant to the requirements of the Securities Act of 1933, this Post- Effective Amendment No. 1 to this Registration Statement has been signed below by the following persons in the capacities indicated and on the dates indicated: Signature Capacity Date --------- -------- ---- /s/ Daniel B. Pinkert Director October 17, 2000 - ------------------------ Daniel B. Pinkert /s/ Debra A. Dowling Director October 17, 2000 - ------------------------ Debra A. Dowling /s/ Debra A. Plumb Director October 17, 2000 - ------------------------ Debra A. Plumb