UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported)

January 31, 2005

STRUCTURED ASSET SECURITIES CORPORATION (as Depositor under the Trust Agreement dated as of January 1, 2005, providing for the issuance of Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2005-WF1)

Structured Asset Securities Corporation

(Exact Name of Registrant as Specified in its Charter)

Delaware

333-120575

74-2440850

(State or Other Jurisdiction

Of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

745 Seventh Avenue, 7^th Floor

New York, NY

(Address of Principal
Executive Offices)

10019

(Zip Code)

Registrant’s telephone number, including area code: (212) 526-7000

No Change

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events

The Registrant registered issuances of its Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2005-WF1 on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, as amended (the “Act”), by a Registration Statement on Form S-3 (Registration File No. 333-120575) (the “Registration Statement”). Pursuant to the Registration Statement, the Registrant issued $912,700,000 aggregate principal amount of Class A1, Class A2, Class A3, Class M1, Class M2, Class M3, Class M4, Class M5, Class M6, Class M7 and Class M8 Certificates of its Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2005-WF1 on January 31, 2005. This Current Report on Form 8-K is being filed to satisfy an undertaking, contained in the definitive Prospectus dated January 25, 2005, as supplemented by the Prospectus Supplement dated January 25, 2005 (the “Prospectus Supplement”), to file a copy of the Trust Agreement (as defined below) and other operative agreements executed in connection with the issuance of the Certificates, a form of which was filed as an exhibit to the Registration Statement.

The Certificates were issued pursuant to a Trust Agreement (the “Trust Agreement”), attached hereto as Exhibit 4.1, dated as of January 1, 2005, among Structured Asset Securities Corporation, as depositor, Aurora Loan Services LLC, as Master Servicer, The Murrayhill Company, as Credit Risk Manager, Wells Fargo Bank, N.A., as Securities Administrator and LaSalle Bank National Association, as Trustee. The “Certificates” consist of the following classes: Class A1, Class A2, Class A3, Class M1, Class M2, Class M3, Class M4, Class M5, Class M6, Class M7 and Class M8. The Certificates evidence all of the beneficial ownership interest in a trust fund (the “Trust Fund”) that consists primarily of a pool of certain conventional, first lien, adjustable and fixed rate, fully amortizing and balloon, residential mortgage loans (the “Mortgage Loans”) with an aggregate outstanding principal balance of approximately $939,002,021.88 as of January 1, 2005. Capitalized terms used herein and not otherwise defined shall have the meanings assigned to them in the Trust Agreement.

Item 9.01. Financial Statements and Exhibits

(a)

Not applicable.

(b)

Not applicable.

(c)

Exhibits:

4.1

Trust Agreement dated as of January 1, 2005, among Structured Asset Securities Corporation, as Depositor, Aurora Loan Services LLC, as Master Servicer, The Murrayhill Company, as Credit Risk Manager, Wells Fargo Bank, N.A., as Securities Administrator and LaSalle Bank National Association, as Trustee.

99.1

Mortgage Loan Sale and Assignment Agreement dated as of January 1, 2005, between Lehman Brothers Holdings Inc., as Seller, and Structured Asset Securities Corporation, as Purchaser.

99.2

Reconstituted Servicing Agreement dated as of January 1, 2005, by and among Lehman Brothers Holdings Inc., as Seller, Aurora Loan Services LLC, as Master Servicer, and Wells Fargo Bank, N.A., as Servicer.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

STRUCTURED ASSET SECURITIES

CORPORATION

By: Ellen V. Kiernan

Name: Ellen V. Kiernan

Title: Senior Vice President

Dated: January 31, 2005

EXHIBIT INDEX

Exhibit No.

Description

4.1

99.1

Mortgage Loan Sale and Assignment Agreement dated as of January 1, 2005, between Lehman Brothers Holdings Inc., as Seller, and Structured Asset Securities Corporation, as Purchaser.

99.2

Reconstituted Servicing Agreement dated as of January 1, 2005, by and among Lehman Brothers Holdings Inc., as Seller, Aurora Loan Services LCC, as Master Servicer, and Wells Fargo Bank, N.A., as Servicer.

Structured Asset Securities Corp Mortgage Pass-Through Certificates, Series 2005-WF1 8-K