PROSPECTUS SUPPLEMENT File No. 333-68747 - ---------------------- (To Prospectus and Prospectus Supplement dated June 16, 2000 and June 15, 2000, respectively) Rule 424(b)(3) Prospectus number: 1983 Merrill Lynch & Co., Inc. Medium Term Notes, Series B Due Nine Months or More from Date of Issue Fixed Rate Notes Principal Amount: $25,000,000 CUSIP Number: 59018S7K4 Interest Rate: 7.06000% Original Issue Date: June 21, 2000 Stated Maturity Date: June 21, 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 Dated: June 19, 2000