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: 1921
Merrill Lynch & Co., Inc.
Medium-Term Notes, Series B
Due Nine Months or More from Date of Issue
Floating Rate Notes
Principal Amount: $175,000,000 Original Issue Date: March 14, 2000
CUSIP Number: 59018S 4V3 Stated Maturity Date: September 14, 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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/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: 3750
CMT Telerate Page: LIBOR Telerate Page:
CMT Reuters Page: LIBOR Reuters Page:
Index Maturity: One Month Minimum Interest Rate: Not Applicable
Spread: 0.000% Maximum Interest Rate: Not Applicable
Initial Interest Rate: TBD Spread Multiplier: Not Applicable
Interest Reset Dates: Monthly, on the 14th of each month commencing April 14,
2000 subject to modified following business day
convention
Interest Payment Dates: Monthly, on the 14th of each month commencing April 14,
2000 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: March 9, 2000
