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: 1950
Merrill Lynch & Co., Inc.
Medium Term Notes, Series B
Due Nine Months or More from Date of Issue
Fixed Rate Notes
Principal Amount: $100,000,000
CUSIP Number: 59018S6A7
Interest Rate: 6.84000%
Original Issue Date: April 18, 2000
Stated Maturity Date: April 18, 2001
Interest Payment Dates: At Maturity 0
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
