PROSPECTUS SUPPLEMENT File No. 333-83374 (To Prospectus Supplement and Prospectus dated April 1, 2002) Rule 424(b)(3) Prospectus number: 2234 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: July 2, 2002 CUSIP Number: 59018YNC1 Stated Maturity Date: July 16, 2007 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 |_| Prime Rate Funds Rate |_| Federal Funds Rate |_| CD Rate |_| Treasury Rate |_| Other (see attached) Designated CMT Page: Designated LIBOR Page: CMT Telerate Page: LIBOR Telerate Page: 3750 CMT Reuters Page: LIBOR Reuters Page: