Exhibit 15
 
November 7, 2007
 
Merrill Lynch & Co., Inc.
4 World Financial Center
New York, NY 10080
 
We have reviewed, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the unaudited condensed consolidated interim financial information of Merrill Lynch & Co., Inc. and subsidiaries (“Merrill Lynch”) as of September 28, 2007 and for the three-month and nine-month periods ended September 28, 2007 and September 29, 2006, as indicated in our report dated November 7, 2007 (which report includes an explanatory paragraph regarding the adoption of Statement of Financial Accounting Standards No. 157, “Fair Value Measurement,” Statement of Financial Accounting Standards No. 159, “The Fair Value Option for Financial Assets and Financial Liabilities — Including an amendment of FASB Statement No. 115,” and FASB Interpretation No. 48, “Accounting for Uncertainty in Income Taxes, an Interpretation of FASB Statement No. 109”); 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 September 28, 2007, is incorporated by reference in the following Registration Statements, 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)


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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)
 
Registration Statement No. 333-99105 (2003 Deferred Compensation Plan for a Select Group of Eligible Employees)
 
Registration Statement No. 333-108296 (2004 Deferred Compensation Plan for a Select Group of Eligible Employees)
 
Registration Statement No. 333-109236 (Employee Stock Compensation Plan)
 
Registration Statement No. 333-118615 (2005 Deferred Compensation Plan for a Select Group of Eligible Employees)
 
Registration Statement No. 333-125109 (2006 Deferred Compensation Plan for a Select Group of Eligible Employees)
 
Registration Statement No. 333-125181 (Deferred Stock Unit Plan for Non-Employees)


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Registration Statement No. 333-134065 (2007 Deferred Compensation Plan for a Select Group of Eligible Employees)
 
Registration Statement No. 333-142962 (2008 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


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Registration Statement No. 333-68747
 
Registration Statement No. 333-38792
 
Registration Statement No. 333-52822
 
Registration Statement No. 333-83374
 
Registration Statement No. 333-97937
 
Registration Statement No. 333-105098
 
Registration Statement No. 333-109802
 
Registration Statement No. 333-122639
 
Registration Statement No. 333-132911
 
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)
 
Registration Statement No. 333-142690 (First Republic Merger)
 
Registration Statement No. 333-146204 (First Republic Bank Amended and Restated Employee Stock Purchase Plan)
 
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 a 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, New York


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