Filed by USX Corporation Pursuant to Rule 425 under the Securities Act of 1933 And deemed filed pursuant to Rule 14a-6 Of the Securities Exchange Act of 1934 Subject Company: USX Corporation Commission File No. 333-69090 USX CORPORATION 600 Grant Street Pittsburgh, PA 15219-4776 October 12, 2001 Dear Fellow Stockholder: According to our latest records, we have not yet received your voting instruction form for the important Special Meeting of Stockholders of USX Corporation on October 25, 2001. Your Board of Directors has unanimously recommended that stockholders vote FOR all Proposals under consideration at the Meeting. Please vote TODAY by telephone, via the Internet, or by signing and returning the enclosed voting instruction form. Very truly yours, /s/ Thomas J. Usher Thomas J. Usher Chairman of the Board of Directors & Chief Executive Officer ================================================================================ IMPORTANT NOTE: Remember that you can now vote by telephone or via the Internet -- Simply follow the instructions on the enclosed voting instruction form. If you have any questions, or need assistance in voting your shares, please call our proxy solicitor, INNISFREE M&A INCORPORATED TOLL-FREE, at 1-888-750-5835. ================================================================================ USX Corporation has filed with the Securities and Exchange Commission a registration statement on Form S-4 that includes materials previously sent to you. You are urged to read the materials because they contain important information. You may obtain a free copy of the registration statement at the Securities and Exchange Commission's web site at www.sec.gov.