EXHIBIT 32.1 FORM10Q 3Q03

Published on November 5, 2003

Exhibit 32.1


CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Merrill Lynch & Co., Inc. (the
"Company") on Form 10-Q for the period ended September 26, 2003 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I, E.
Stanley O'Neal, Chairman of the Board and Chief Executive Officer of the
Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The 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 Report fairly presents, in
all material respects, the financial condition and results of
operations of the Company.


/s/ E. Stanley O'Neal
--------------------------------------------------
E. Stanley O'Neal
Chairman of the Board and
Chief Executive Officer

Dated: November 5, 2003





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