SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 ________________ SCHEDULE 14D-1/A Tender Offer Statement Pursuant to Section 14(d)(1) of the Securities Exchange Act of 1934 (Amendment No. 13) __________________ COMSAT CORPORATION (Name of Subject Company) REGULUS, LLC LOCKHEED MARTIN CORPORATION (Bidders) Common Stock, Without Par Value (Title of Class of Securities) 20564D107 (CUSIP Number of Class of Securities) STEPHEN M. PIPER, ESQ. LOCKHEED MARTIN CORPORATION 6801 ROCKLEDGE DRIVE BETHESDA, MARYLAND 20817 (301) 897-6000 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications on behalf of Bidders) COPY TO: DAVID G. LITT, ESQ. O'MELVENY & MYERS LLP 555 13TH STREET, N.W. SUITE 500 WEST WASHINGTON, D.C. 20004-1109 (202) 383-5300 CALCULATION OF FILING FEE Transaction Valuation(1): $1,169,509,386 Amount of Filing Fee: $233,901 (1) Estimated for purposes of calculating the amount of the filing fee only. The amount assumes the purchase of 25,703,503 shares of common stock, without par value (the "Shares"), of COMSAT Corporation (the "Company") at a price per Share of $45.50 in cash (the "Offer Price"). Such number of shares represents 49% of the shares of Common Stock of the Company outstanding as of September 11, 1998, minus the number of shares of the Series II Common Stock of the Company outstanding as of September 11, 1998. [x] Check box if any part of the fee is offset as provided by Rule 0-11(a)(2) and identify the filing with which the offsetting fee was previously paid. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing. Amount previously paid: $233,901 Filing Parties: Regulus, LLC and Lockheed Martin Corporation Form or registration no.: Schedule 14D-1 Date Filed: September 25, 1998 (Continued on following page(s)) (Page 2 of 6 pages) This Amendment No. 13 to the Tender Offer Statement on Schedule 14D-1 (the "Schedule 14D-1") amends and supplements the Schedule 14D-1 of Regulus, LLC, a single member Delaware limited liability company (the "Purchaser") and a wholly- owned subsidiary of Lockheed Martin Corporation, a Maryland corporation ("Parent"), in respect of the tender offer (the "Offer") by the Purchaser to purchase up to 49% (less certain adjustments) of the issued and outstanding shares (the "Shares") of common stock, without par value, of COMSAT Corporation, a District of Columbia corporation (the "Company"), at a price of $45.50 per Share, net to the seller in cash, without interest thereon, upon the terms and subject to the conditions set forth in the Offer to Purchase dated September 25, 1998 (the "Offer to Purchase") and in the related Letter of Transmittal. The Offer is being made pursuant to an Agreement and Plan of Merger dated as of September 18, 1998, among the Company, Parent and Deneb Corporation, a wholly- owned subsidiary of Parent. The Schedule 14D-1 was initially filed with the Securities and Exchange Commission on September 25, 1998. Capitalized terms not defined herein have the meanings assigned thereto in the Schedule 14D-1 and the Offer to Purchase, which is attached as Exhibit (a)(1) to the Schedule 14D-1. The Purchaser and Parent hereby amend and supplement the Schedule 14D-1 as follows: ITEM 10: ADDITIONAL INFORMATION Item 10(b)-(c) is hereby amended and supplemented by the addition of the following paragraphs thereto: Parent has previously disclosed that it had negotiated terms with the Antitrust Division of the Department of Justice (the "Antitrust Division") which could form the basis of a consent order that would resolve concerns raised by the staff of the Antitrust Division in the HSR Act antitrust review process as to Parent's simultaneous ownership of shares of Loral Space & Communications Ltd. ("Loral Space") and, following the consummation of the tender offer, the Company. As the proposed consent order contemplated the divestiture of Parent's equity holdings of Loral Space, Parent also disclosed that its willingness to enter into a consent order reflecting the terms negotiated was conditioned upon Parent's reaching certain agreements with Loral Space that would offer Parent assurances satisfactory to it that it could accomplish the divestiture in accordance with the terms and conditions and within the time periods contemplated by the proposed consent order. Parent has been unable to obtain these assurances. In addition, Parent and the Company have previously disclosed that, in response to their filings with the Antitrust Division of the notices required by the HSR Act, each had received from the Antitrust Division a request for additional information. The receipt of such requests extends the HSR Act waiting period (prior to which the companies may not complete the Offer or the Merger without violating the antitrust laws) until the 20th calendar day after each company substantially complies with the request directed to it. Also disclosed was that Parent and the Company had each provided data to the Antitrust Division responsive to the requests for additional information but that neither had supplied all of the information requested. In view of the status of Parent's discussions with Loral Space, Parent and the Company determined to provide the Antitrust Division with the remaining materials responsive to the requests for additional information. (Page 3 of 6 pages) Each company supplied the additional materials and on, August 27, 1999, each certified that it was in substantial compliance with the request directed to it. In conjunction with the production by Parent and the Company of the additional information and the certifications of substantial compliance, the staff of the Antitrust Division has requested depositions of representatives of Parent and the Company. Substantial compliance with the Antitrust Division's requests for information starts the running of a 20 calendar day waiting period which the companies anticipate will expire at midnight, New York City Time on September 16, 1999. The Antitrust Division has the authority to terminate this waiting period early. If prior to the expiration of the waiting period the Antitrust Division does not challenge compliance by either or both companies with the Antitrust Division's requests for information, the waiting period will expire. In addition, the Antitrust Division has the authority to bring an action alleging that the proposed transactions would be likely to lessen competition in violation of the antitrust laws. The expiration or termination of the waiting period is one of the conditions to the Offer. Neither Parent nor the Company knows whether the Antitrust Division will terminate the waiting period early, will allow the period to expire or will challenge compliance by either or both companies with the Antitrust Division's requests for information, or will elect to bring an action challenging the transactions as violating the antitrust laws before the expiration of the waiting period. (Page 4 of 6 pages) SIGNATURE After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. September 3, 1999 REGULUS, LLC By: /s/ Marian S. Block -------------------------------------- Name: Marian S. Block Title: Vice President (Page 5 of 6 pages) SIGNATURE After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. September 3, 1999 LOCKHEED MARTIN CORPORATION By: /s/ Marian S. Block --------------------------------------- Name: Marian S. Block Title: Assistant Secretary (Page 6 of 6 pages)