PROSPECTUS SUPPLEMENT File No. 333-68747
(To Prospectus and Prospectus Supplement dated May 6, 1999) Rule 424(b)(3)
Prospectus number: 1978
Merrill Lynch & Co., Inc.
Medium-Term Notes, Series B
Due Nine Months or More from Date of Issue
Floating Rate Notes
Principal Amount: $105,000,000 Original Issue Date: May 31, 2000
CUSIP Number: 59018S 7D0 Stated Maturity Date: May 31, 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: 3750
CMT Reuters Page: LIBOR Reuters Page:
Index Maturity: One Month Minimum Interest Rate: Not Applicable
Spread: 0.170% Maximum Interest Rate: Not Applicable
Initial Interest Rate: TBD Spread Multiplier: Not Applicable
Interest Reset Dates: Monthly, on the last business day of each month,
subject to modified following business day
convention.
Interest Payment Dates: Monthly, on the last business day of each month,
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: May 24, 2000
