File No. 333-132911
                                                                Rule 424(b)(3)


PRICING SUPPLEMENT
- ------------------
(To MTN prospectus supplement,
general prospectus supplement and
and prospectus, each dated March 31, 2006)
Pricing Supplement Number: 2539


<TABLE>
<CAPTION>
                                                             Merrill Lynch & Co., Inc.
                                                            Medium-Term Notes, Series C
                                                     Due Nine Months or More from Date of Issue

                                                                Floating Rate Notes
     <S>                      <C>                                     <C>                                   <C>
     Principal Amount:        $750,000,000                            Original Issue Date:                  May 26, 2006

     CUSIP Number:            59018YXK2                               Stated Maturity Date:                 May 27, 2008

     Issue Price:             100%

     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 Moneyline Telerate Page:                                  LIBOR Moneyline Telerate Page: 3750
                                                                                       LIBOR Reuters Page:


     Index Maturity:          One Month                               Minimum Interest Rate:                Not Applicable



     Spread:                   + 0.03%                                Maximum Interest Rate:                Not Applicable

     Initial Interest Rate:   Calculated as if the Original Issue     Spread Multiplier:                    Not Applicable
                              Date was an Interest Reset Date
</TABLE>

     Interest Reset Dates:    Monthly, on the 27th of every month, commencing
                              on June 27, 2006, subject to modified following
                              Business day convention.


     Interest Payment Dates:  Monthly, on the 27th of every month, commencing
                              on June 27, 2006, 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:                 JPMorgan Chase Bank, N.A.

     Underwriters:            Merrill Lynch, Pierce, Fenner & Smith
                              Incorporated ("MLPF&S"), Fifth Third Securities,
                              Inc. and LaSalle Financial Services, Inc. (the
                              "Underwriters"), are acting as principals in
                              this transaction. MLPF&S is acting as the Lead
                              Underwriter.

                              Pursuant to an agreement, dated May 23, 2006
                              (the "Agreement"), between Merrill Lynch & Co.,
                              Inc. (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:

<TABLE>
<CAPTION>
                              Underwriters                           Principal Amount of the Notes
                              ------------                           -----------------------------
                              <S>                                                     <C>
                              Merrill Lynch, Pierce, Fenner & Smith                   $735,000,000
                                          Incorporated
                              Fifth Third Securities, Inc.                              $7,500,000
                              LaSalle Financial Services, Inc.                          $7,500,000
                                                                                        ----------
                                                              Total                   $750,000,000
</TABLE>

                              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.

     Underwriting Discount:   0.1750%

     Dated:                   May 23, 2006