UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

__________

FORM 10-K

FOR ANNUAL AND TRANSITION REPORTS

PURSUANT TO SECTIONS 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

(Mark One)

[X] ANNUAL REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from __________ to __________

Commission File Numbers 001-16443, 333-101155

MS STRUCTURED ASSET CORP.

On behalf of

SATURNS CBT Series 2003-1 Units Trust

(Exact name of registrant as specified in its charter)

Delaware	13-4026700
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification No.)

1585 Broadway, Second Floor New York, New York Attention: In-Young Chase	10036
(Address of principal executive office)	(Zip Code)

Registrant’s telephone number, including area code:	(212) 761-2457

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Name of Each Exchange on Which Registered
SATURNS CBT Series 2003-1 Units Trust	American Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ___ No X

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Yes ___ No X

Indicate by check mark whether 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 has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ___ No ___

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [ ]

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):

Large accelerated filer ___ Accelerated filer ___ Non-accelerated filer X Smaller reporting company ___

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes ___ No X

All of the common stock of the registrant is held by Morgan Stanley. As of March 14, 2013, 1,000 shares of common stock, par value $1.00 per share, were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

The distribution reports to security holders filed on Form 8-K during the Fiscal Year in lieu of reports on Form 10-Q.

Introductory Note

The Registrant is the depositor under the trust agreements for its various SATURNS Units listed on the American Stock Exchange. The Units do not represent obligations of or interests in the Depositor. Pursuant to staff administrative positions established in various no-action letters, see e.g. Corporate Asset Backed Corporation (available August 9, 1995), the Registrant is not required to respond to various items of Form 10-K. Such items are designated herein as “Not applicable.” Distribution reports detailing receipts and distributions by each trust are filed shortly after each distribution date on Form 8-K in lieu of reports on Form 10-Q.

The underlying security issuer or guarantor, as applicable, of the securities held by each of the trusts is subject to the informational requirements of the Exchange Act. The underlying security issuer or guarantor, as applicable, currently files reports, proxy statements and other information with the SEC. For information regarding such underlying security issuer or guarantor, you should refer to such reports. These periodic, current and other reports and other information can be inspected and copied at the public reference facilities maintained by the SEC at Room 1024, 100 F Street, N.E., Washington, D.C. 20549. Copies of those materials can be obtained by making a written request to the SEC, Public Reference Section, 100 F Street, N.E., Washington, D.C. 20549, at prescribed rates. The SEC also maintains a website on the internet at http://www.sec.gov at which users can view and download copies of reports, proxy, information statements and other information filed electronically. In addition, those reports and other information may also be obtained from the underlying security issuer by making a request to the underlying security issuer. The trust, the trustee, the Registrant, and their affiliates have not verified, have not undertaken to verify, and will not verify, the content of any such reports or information. The name and the central index key (CIK) for each underlying security issuer or guarantor is set forth below:

Trust	Underlying Security Issuer or Guarantor	CIK
CBT 2003-1	The Goldman Sachs Group, Inc.	0000886982

	Johnson & Johnson	0000200406

	Wal-Mart Stores, Inc.	0000104169

PART I

ITEM 1. BUSINESS

Not Applicable

ITEM 1A. RISK FACTORS

Not Applicable

ITEM 1B. UNRESOLVED STAFF COMMENTS

None

ITEM 2. PROPERTIES

Not Applicable

ITEM 3. LEGAL PROCEEDINGS

None

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

None

PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

The Units issued by the SATURNS trusts listed below representing investors’ interest in such trust are represented by one or more physical certificates registered in the name of Cede & Co., the nominee of The Depository Trust Company. The Units are listed on the American Stock Exchange:

SATURNS CBT Series 2003-1 Units Trust

ITEM 6. SELECTED FINANCIAL DATA

Not Applicable

ITEM 7.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Not Applicable

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Not Applicable

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

Not Applicable

ITEM 9.

CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None

ITEM 9A. CONTROLS AND PROCEDURES

Not Applicable

ITEM 9B. OTHER INFORMATION

None

PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

None

ITEM 11. EXECUTIVE COMPENSATION

Not Applicable

ITEM 12.

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

None

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

None

ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

Not Applicable

PART IV

ITEM 15.

EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a) The following documents are filed as part of this Report: None

(b) Reports on Form 8-K:

See Table Below:

SATURNS Trust No.:	Closing Date	Payment Dates	Form 8-K Filing Dates (Not Trust Agreement Filings in connection with Closing Date) For FY 2012
CBT 2003-1	9/25/03	January 25, 2012, February 27, 2012, March 26, 2012, April 25, 2012, May 25, 2012, June 25, 2012, July 25, 2012, August 27, 2012, September 25, 2012, October 25, 2012, November 26, 2012, December 26, 2012	January 27, 2012, February 28, 2012, March 27, 2012, April 26, 2012, June 1, 2012, June 26, 2012, July 25, 2012, August 30, 2012, September 27, 2012, October 26, 2012, November 26, 2012, Decmber 27, 2012

SATURNS Trust No.:	Closing Date	Event Description	Form 8-K/A Filing Dates (Not Trust Agreement Filings in connection with Closing Date or filings related to Payment Dates) For FY 2012
CBT 2003-1	9/25/03	A report on Form 8-K. Schedule A, Amended Schedule of Payment on Corporate Bond Tracers Units	June 8, 2012

Exhibit 23	Consent of Grassi & Co. (See Exhibit 99.1 – contained in final paragraph of accountants’ letter)
Exhibit 31.1	Rule 13a-14(d) Certification
Exhibit 31.2	Trustee Compliance Certification (U.S. Bank National Association)
Exhibit 99.1	Report of Grassi & Co.

(d) Not applicable

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: March 27, 2013

MS STRUCTURED ASSET CORP.

(Registrant)

By: /s/ In-Young Chase

Name: In-Young Chase

Title: Vice President

MS STRUCTURED ASSET CORP CBT SERIES 2003-1 10-K