PROSPECTUS SUPPLEMENT File No. 333-83374 - --------------------- Rule 424(b)(3) (To Prospectus Supplement and Prospectus dated April 1, 2002) Prospectus Supplement Number: 2221 Merrill Lynch & Co., Inc. Medium-Term Notes, Series B Due Nine Months or More from Date of Issue Floating Rate Notes Principal Amount: $50,000,000 Original Issue Date: April 9, 2002 CUSIP Number: 59018YMQ1 Stated Maturity Date: April 9, 2003 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: