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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

For the quarterly period ended May 31, 2006

OR

For the transition period from             to             

Commission file number 1-11758

Morgan Stanley

(Exact Name of Registrant as Specified in its Charter)

Registrant’s telephone number, including area code: (212) 761-4000

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer” and “large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of June 30, 2006, there were 1,071,959,235 shares of the Registrant’s Common Stock, par value $.01 per share, outstanding.

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MORGAN STANLEY

INDEX TO QUARTERLY REPORT ON FORM 10-Q

Quarter Ended May 31, 2006

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AVAILABLE INFORMATION

Morgan Stanley files annual, quarterly and current reports, proxy statements and other information with the Securities and Exchange Commission (the “SEC”). You may read and copy any document we file with the SEC at the SEC’s public reference room at 100 F Street, NE, Washington, DC 20549. Please call the SEC at 1-800-SEC-0330 for information on the public reference room. The SEC maintains an internet site that contains annual, quarterly and current reports, proxy and information statements and other information that issuers (including Morgan Stanley) file electronically with the SEC. Morgan Stanley’s electronic SEC filings are available to the public at the SEC’s internet site, www.sec.gov.

Morgan Stanley’s internet site is www.morganstanley.com. You can access Morgan Stanley’s Investor Relations webpage through our internet site, www.morganstanley.com, by clicking on the “About Morgan Stanley” link to the heading “Investor Relations.” You can also access our Investor Relations webpage directly at www.morganstanley.com/about/ir. Morgan Stanley makes available free of charge, on or through our Investor Relations webpage, its proxy statements, Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to those reports filed or furnished pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as soon as reasonably practicable after such material is electronically filed with, or furnished to, the SEC. Morgan Stanley also makes available, through our Investor Relations webpage, via a link to the SEC’s internet site, statements of beneficial ownership of Morgan Stanley’s equity securities filed by its directors, officers, 10% or greater shareholders and others under Section 16 of the Exchange Act.

Morgan Stanley has a Corporate Governance webpage. You can access Morgan Stanley’s Corporate Governance webpage through our internet site, www.morganstanley.com, by clicking on the “About Morgan Stanley” link to the heading “Inside the Company.” You can also access our Corporate Governance webpage directly at www.morganstanley.com/about/inside/governance. Morgan Stanley posts the following on its Corporate Governance webpage:

You can request a copy of these documents, excluding exhibits, at no cost, by contacting Investor Relations, 1585 Broadway, New York, NY 10036 (212-761-4000). The information on Morgan Stanley’s internet site is not incorporated by reference into this report.

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MORGAN STANLEY

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION

(dollars in millions, except share data)

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MORGAN STANLEY

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION—(Continued)

(dollars in millions, except share data)

See Notes to Condensed Consolidated Financial Statements.

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MORGAN STANLEY

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(dollars in millions, except share and per share data)