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: 1939
Merrill Lynch & Co., Inc.
Medium-Term Notes, Series B
Due Nine Months or More from Date of Issue
Floating Rate Notes
Principal Amount: $100,000,000 Original Issue Date: April 11, 2000
CUSIP Number: 59018S 5P5 Stated Maturity Date: April 16, 2001
Interest Calculation: Day Count Convention:
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|x| Regular Floating Rate Note |x| Actual/360
| | Inverse Floating Rate Note | | 30/360
(Fixed Interest Rate): | | Actual/Actual
Interest Rate Basis:
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| | 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:
Index Maturity: Daily Fed Funds Minimum Interest Rate: Not Applicable
Effective
Spread: 0.150% Maximum Interest Rate: Not Applicable
Initial Interest Rate: TBD Spread Multiplier: Not Applicable
Interest Reset Dates: Daily, subject to the modified business day
convention.
Interest Payment Dates: Monthly, commencing on the 16th of May, 2000 and each
16th of the month to 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: April 6, 2000
