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: 1888
Merrill Lynch & Co., Inc.
Medium-Term Notes, Series B
Due Nine Months or More from Date of Issue
Floating Rate Notes
Principal Amount: $20,000,000 Original Issue Date: December 30, 1999
CUSIP Number: 59018S 3N2 Stated Maturity Date: January 1, 2007
Interest Calculation: Day Count Convention:
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/x/ Regular Floating Rate Note /x/ Actual/360
/_/ Inverse Floating Rate Note /_/ 30/360
(Fixed Interest Rate): /0/ Actual/Actual
Interest Rate Basis:
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/x/ LIBOR /_/ Commercial Paper Rate
/_/ CMT Rate /_/ Eleventh District Cost of
Funds Rate
/_/ Prime Rate /_/ CD Rate
/$-/ Federal Funds Rate /_/ Other (see attached)
/_/ Treasury Rate
Designated CMT Page: Designated LIBOR Page:
CMT Telerate Page: LIBOR Telerate Page:
CMT Reuters Page: LIBOR Reuters Page:
Index Maturity: Three Months Minimum Interest Rate: Not Applicable
Spread: 0.100% Maximum Interest Rate: Not Applicable
Initial Interest Rate: TBD Spread Multiplier: Not Applicable
Interest Reset Dates: Quarterly, on the 1st of January, April, July
and October, commencing April 1, 2000; subject
to modified following business day convention
Interest Payment Dates: Quarterly, on the 1st of January, April, July
and October, commencing April 1, 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: 12/20/99
