UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 17, 1999 FRONTIER OIL CORPORATION (Exact name of registrant as specified in its charter) Wyoming 001-07627 74-1895085 (State or other jurisdiction (Commission File Number) (I.R.S. Employer of incorporation) Identification No.) 10000 Memorial Drive, Suite 600 Houston, Texas 77024-3411 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (713) 688-9600 Item 5. Other Events On November 17, 1999, Frontier Oil Corporation issued a press release announcing the completion of its acquisition of the El Dorado refinery. The press release is filed as Exhibit 99.1 to this Current Report on Form 8-K, and the contents of such Exhibit are incorporated herein by reference. Item 7. Financial Statements and Exhibits (c) Exhibits 99.1 Press Release, dated November 17, 1999. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. FRONTIER OIL CORPORATION By: /s/ Julie H. Edwards ---------------------------------- Julie H. Edwards Senior Vice President Finance and Chief Financial Officer Date: November 18, 1999