Exhibit 15 August 9, 2002 Merrill Lynch & Co., Inc. 4 World Financial Center New York, NY 10080 We have made a review, in accordance with standards established by the American Institute of Certified Public Accountants, of the unaudited condensed consolidated financial statements of Merrill Lynch & Co., Inc. and subsidiaries ("Merrill Lynch") as of June 28, 2002 and for the three-month and six-month periods ended June 28, 2002 and June 29, 2001, as indicated in our report dated August 9, 2002; because we did not perform an audit, we expressed no opinion on that information. We are aware that our report referred to above, which is included in your Quarterly Report on Form 10-Q for the quarter ended June 28, 2002, is incorporated by reference in the following documents, as amended: Filed on Form S-8: Registration Statement No. 33-41942 (1986 Employee Stock Purchase Plan) Registration Statement No. 33-17908 (Incentive Equity Purchase Plan) Registration Statement No. 33-33336 (Long-Term Incentive Compensation Plan) Registration Statement No. 33-51831 (Long-Term Incentive Compensation Plan) Registration Statement No. 33-51829 (401(k) Savings and Investment Plan) Registration Statement No. 33-54154 (Non-Employee Directors' Equity Plan) Registration Statement No. 33-54572 (401(k) Savings and Investment Plan (Puerto Rico)) Registration Statement No. 33-56427 (Amended and Restated 1994 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 33-55155 (1995 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 33-60989 (1996 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-00863 (401(k) Savings & Investment Plan) Registration Statement No. 333-09779 (1997 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-13367 (Restricted Stock Plan for Former Employees of Hotchkis and Wiley) Registration Statement No. 333-15009 (1997 KECALP Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-17099 (Deferred Unit and Stock Unit Plan for Non-Employee Directors) Registration Statement No. 333-18915 (Long-Term Incentive Compensation Plan for Managers and Producers) Registration Statement No. 333-32209 (1998 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-33125 (Employee Stock Purchase Plan for Employees of Merrill Lynch Partnerships) Registration Statement No. 333-41425 (401(k) Savings & Investment Plan) Registration Statement No. 333-56291 (Long-Term Incentive Compensation Plan for Managers and Producers) Registration Statement No. 333-60211 (1999 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-62311 (Replacement Options; Midland Walwyn Inc.) Registration Statement No. 333-85421 (401(k) Savings and Investment Plan) Registration Statement No. 333-85423 (2000 Deferred Compensation Plan For a Select Group of Eligible Employees) Registration Statement No. 333-92663 (Long-Term Incentive Compensation Plan for Managers and Producers) Registration Statement No. 333-44912 (2001 Deferred Compensation Plan for a Select Group of Eligible Employees) Registration Statement No. 333-64676 (1986 Employee Stock Purchase Plan) Registration Statement No. 333-64674 (Long-Term Incentive Compensation Plan for Managers and Producers) Registration Statement No. 333-68330 (2002 Deferred Compensation Plan for a Select Group of Eligible Employees) Filed on Form S-3: Debt Securities, Warrants, Common Stock, Preferred Securities, and/or Depository Shares: Registration Statement No. 33-54218 Registration Statement No. 2-78338 Registration Statement No. 2-89519 Registration Statement No. 2-83477 Registration Statement No. 33-03602 Registration Statement No. 33-17965 Registration Statement No. 33-27512 Registration Statement No. 33-33335 Registration Statement No. 33-35456 Registration Statement No. 33-42041 Registration Statement No. 33-45327 Registration Statement No. 33-45777 Registration Statement No. 33-49947 Registration Statement No. 33-51489 Registration Statement No. 33-52647 Registration Statement No. 33-55363 Registration Statement No. 33-60413 Registration Statement No. 33-61559 Registration Statement No. 33-65135 Registration Statement No. 333-13649 Registration Statement No. 333-16603 Registration Statement No. 333-20137 Registration Statement No. 333-25255 Registration Statement No. 333-28537 Registration Statement No. 333-42859 Registration Statement No. 333-44173 Registration Statement No. 333-59997 Registration Statement No. 333-68747 Registration Statement No. 333-38792 Registration Statement No. 333-52822 Registration Statement No. 333-83374 Medium Term Notes: Registration Statement No. 2-96315 Registration Statement No. 33-03079 Registration Statement No. 33-05125 Registration Statement No. 33-09910 Registration Statement No. 33-16165 Registration Statement No. 33-19820 Registration Statement No. 33-23605 Registration Statement No. 33-27549 Registration Statement No. 33-38879 Other Securities: Registration Statement No. 333-02275 (Long-Term Incentive Compensation Plan) Registration Statement No. 333-24889 (Long-Term Incentive Compensation Plan, and Long-Term Incentive Compensation Plan for Managers and Producers) Registration Statement No. 333-36651 (Hotchkis and Wiley Resale) Registration Statement No. 333-59263 (Exchangeable Shares of Merrill Lynch & Co., Canada Ltd. re: Midland Walwyn Inc.) Registration Statement No. 333-67903 (Howard Johnson & Company Resale) Registration Statement No. 333-45880 (Herzog, Heine, Geduld, Inc. Resale) We are also aware that the aforementioned report, pursuant to Rule 436(c) under the Securities Act of 1933, is not considered a part of the Registration Statement prepared or certified by an accountant or a report prepared or certified by an accountant within the meaning of Sections 7 and 11 of that Act. /s/ Deloitte & Touche LLP New York, NY