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PROSPECTUS SUPPLEMENT                                                     File No. 333-52822
- ----------------------                                                    Rule 424(b)(3)
(To Prospectus Supplement and Prospectus dated January 24, 2001)

                           MERRILL LYNCH & CO., INC.


                          MEDIUM TERM NOTES, SERIES B
                  DUE NINE MONTHS OR MORE FROM DATE OF ISSUE

                               FIXED RATE NOTES


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Principal Amount:             $150,000,000

Commission:                   0.175%

Issue Price:                  100.00%

Proceeds:                     $149,737,500.00

Cusip Number:                 590 18YHP9

Interest Rate:                4.93000%

Original Issue Date:          April 27, 2001

Stated Maturity Date:         April 25, 2003

Interest Payment Dates:       Each April 25th and October 25th, commencing on October 25, 2001,
                              subject to Following Business Day Convention.
Repayment at the Option
of the Holder:                The Notes cannot be repaid prior to the Stated Maturity Date.

Redemption at the Option
of the Company:               The Notes cannot be redeemed prior to the Stated Maturity Date.

Form:                         The Notes are being issued in fully registered book-entry form.

Trustee:                      The Chase Manhattan Bank

Underwriters:
                              Merrill Lynch, Pierce, Fenner & Smith Incorporated ("MLPF&S"), HSBC Securities (USA) Inc. and
                              Wachovia Securities, Inc. (the "Underwriters"), are acting as principals in this transaction.
                              MLPF&S is acting as the Lead Underwriter.

                              Pursuant to an agreement, dated April 24, 2001 (the "Agreement"), between the Company and the
                              Underwriters, the Company has agreed to sell to each of the Underwriters and each of the
                              Underwriters has severally and not jointly agreed to purchase the principal amount of Notes set
                              forth opposite its name below:

                              Underwriters                                     Principal Amount of the Notes
                              ------------                                     -----------------------------

                              Merrill Lynch, Pierce, Fenner & Smith                          $135,000,000
                                          Incorporated
                              HSBC Securities (USA) Inc.                                      $7,500,000
                              Wachovia Securities, Inc.                                       $7,500,000
                                                                                              ----------
                                                                    Total                   $150,000,000

                              Pursuant to the Agreement, the obligations of the Underwriters are subject to
                              certain conditions and the Underwriters are committed to take and pay for all
                              of the Notes, if any are taken.

                              The Underwriters have advised the Company that they propose initially to offer
                              all or part of the Notes directly to the public at the Issue Price listed
                              above. After the initial public offering, the Issue Price may be changed.

                              The Company has agreed to indemnify the Underwriters against certain
                              liabilities, including liabilities under the Securities Act of 1933, as
                              amended.

Dated:                        April 24, 2001


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