PROSPECTUS SUPPLEMENT File No. 333-68747
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(To Prospectus and Prospectus Supplement dated May 6,1999) Rule 424(b)(3)
Prospectus number: 1906
Merrill Lynch & Co., Inc.
Medium-Term Notes, Series B
Due Nine Months or More from Date of Issue
Floating Rate Notes
Principal Amount: $500,000,000 Original Issue Date: March 2, 2000
CUSIP Number: 59018S 4E1 Stated Maturity Date: March 2, 2001
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:
|_| LIBOR |_| Commercial Paper Rate
|_| CMT Rate |_| Eleventh District Cost of
Funds Rate
|_| Prime Rate |_| CD Rate
|X| 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:
<TABLE>
<CAPTION>
<S> <C> <C> <C>
Index Maturity: Daily Fed Funds Effective Minimum Interest Rate: Not Applicable
Spread: 0.160% Maximum Interest Rate: Not Applicable
Initial Interest Rate: TBD Spread Multiplier: Not Applicable
</TABLE>
Interest Reset Dates: Daily, subject to the modified business day
convention.
Interest Payment Dates: Quarterly, on the 2nd of June, September, December
and at Maturity, subject to the modified 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: February 25, 2000
