PROSPECTUS SUPPLEMENT File No. 333-38792 - ---------------------- (To Prospectus Supplement and Prospectus dated June 16, 2000 and June 15, 2000, respectively) Rule 424(b)(3) Prospectus number: 1984 Merrill Lynch & Co., Inc. Medium-Term Notes, Series B Due Nine Months or More from Date of Issue Floating Rate Notes Principal Amount: $10,000,000 Original Issue Date: June 30, 2000 CUSIP Number: 59018S 7L2 Stated Maturity Date: June 30, 2005 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: Three Months Minimum Interest Rate: Not Applicable Spread: 0.0000% Maximum Interest Rate: Not Applicable Initial Interest Rate: TBD Spread Multiplier: Not Applicable Interest Reset Dates: Quarterly, on the 30th of every March, June, September and December, commencing September 29, 2000, subject to modified following business day convention. Interest Payment Dates: Quarterly, on the 30th of every March, June, September and December, commencing September 29, 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: June 20, 2000