PROSPECTUS SUPPLEMENT                                         File No. 333-52822
- ---------------------                                             Rule 424(b)(3)
(To Prospectus Supplement and Prospectus
dated January 24, 2001)
Prospectus number:      2179


                             Merrill Lynch & Co., Inc.
                           Medium Term Notes, Series B
                   Due Nine Months or More from Date of Issue


                               Floating Rate Notes


Principal Amount:  $10,000,000         Original Issue Date:    Dec. 3, 2001

CUSIP Number:      59018Y KW0          Stated Maturity Date:   Dec. 12, 2002


Interest Calculation:                  Day Count Convention:
- ---------------------                  ---------------------
[X]  Regular Floating Rate Note        [X]  Actual/360

[ ]  Inverse Floating Rate Note        [ ]  30/360

       (Fixed Interest Rate):          [ ]  Actual/Actual


Interest Rate Basis:
- --------------------
[X]  LIBOR                             [ ]  Commercial Paper Rate

[ ]  CMT Rate                          [ ]  Eleventh District Cost of Funds Rate

[ ]  Prime Rate                        [ ]  CD Rate

[ ]  Federal Funds Rate                [ ]  Other (see attached)

[ ]  Treasury Rate

   Designated CMT Page:                Designated LIBOR Page:
        CMT Telerate Page:                  LIBOR Telerate Page:
        CMT Reuters Page:                   LIBOR Reuters Page:


Index Maturity:        One Month           Minimum Interest Rate: Not Applicable

Spread:                -0.0500%            Maximum Interest Rate: Not Applicable

Initial Interest:      TBD                 Spread Multiplier:     Not Applicable



Interest Reset Dates:            Monthly, on the 12th of every month, commencing
                                 Jan. 12, 2002, subject to modified following
                                 business day convention.

Interest Payment Dates:          Monthly, on the 12th of every month, commencing
                                 Jan. 12, 2002, subject to modified 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

Dated:                           Nov. 28, 2001