Exhibit 99 IRVING, Texas and FAIRFAX, Va. (BUSINESS WIRE) Nov. 27, 1998 Exxon and Mobil confirm that they are in discussions concerning a possible combination transaction. No definitive agreement has been reached. We cannot give any assurance that an agreement will be reached. Beyond this statement, we have no further comment. CONTACT: Exxon Media Relations, 972/444-1107 Mobil Media Relations, 703/846-2500