<Page> Exhibit 99.1 CERTIFICATE PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 The undersigned, Eleanor L. Thomas, President (chief executive officer) of the managing owner, Prudential Securities Futures Management Inc. (the 'Managing Owner'), of World Monitor Trust II--Series F ('Series F'), hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) Series F's Annual Report on Form 10-K for the period ending December 31, 2002, as filed with the Securities and Exchange Commission on the date hereof (the 'Annual Report'), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of Series F. /s/ Eleanor L. Thomas - ------------------------------------------------------ Eleanor L. Thomas President (chief executive officer) of the Managing Owner March 18, 2003 The undersigned, Steven Weinreb, Chief Financial Officer of the managing owner, the Managing Owner, of Series F, hereby certifies, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) Series F's Annual Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Annual Report fairly presents, in all material respects, the financial condition and results of operations of Series F. /s/ Steven Weinreb - ------------------------------------------------------ Steven Weinreb Chief Financial Officer of the Managing Owner March 18, 2003