________________________________________________

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)

June 30, 2005

GS Mortgage Securities Corp.

(Exact Name of Registrant as Specified in its Charter)

Delaware

333-120274

13-6357101

(State or Other Jurisdiction

Of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

85 Broad Street

New York, New York

10004

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s telephone number, including area code: (212) 902-1000

None

(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 Mortgage Pass-Through Certificates, Series 2005-AR4 on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, as amended, by a Registration Statement on Form S-3 (Registration File No. 333-120274) (the “Registration Statement”). Pursuant to the Registration Statement, the Registrant issued $1,276,571,300 aggregate principal amount of Class 1A1, Class 2A1, Class 3A1, Class 3A2, Class 3A3, Class 3A4, Class 3A5, Class 4A1, Class 5A1, Class 6A1, Class X, Class 1B1, Class 1B2, Class 1B3, Class 2B1, Class 2B2, Class 2B3, Class R, Class RT1 and Class RT2 (the “Publicly Offered Certificates”) on June 30, 2005. This Current Report on Form 8-K is being filed to satisfy an undertaking, contained in the definitive Prospectus dated December 1, 2004, as supplemented by the Prospectus Supplement dated June 28, 2005, to file a copy of the Trust Agreement (as defined below) and other operative agreements executed in connection with the issuance of the Publicly Offered Certificates, a form of which was filed as an exhibit to the Registration Statement.

The Publicly Offered Certificates were issued pursuant to a Master Servicing and Trust Agreement (the “Trust Agreement”), attached hereto as Exhibit 4.5.1, dated as of June 1, 2005, among GS Mortgage Securities Corp., as Depositor, U.S. Bank National Association, as Trustee, JPMorgan Chase Bank, N.A., as a custodian, Wells Fargo Bank, N.A., as Securities Administrator, Master Servicer and a custodian, and Thornburg Mortgage Home Loans, Inc., as credit risk advisor, which incorporates by reference the Standard Terms to Master Servicing and Trust Agreement, June 2005 Edition (the “Standard Terms”), attached hereto as Exhibit 4.5.2. The “Certificates” consist of the Publicly Offered Certificates and the Class 1B4, Class 1B5, Class 1B6, Class 2B4, Class 2B5 and Class 2B6 Certificates. The Certificates evidence all of the beneficial ownership interest in a trust fund that consists primarily of a pool of certain interest only and conventional, hybrid, adjustable rate, amortizing, residential mortgage loans with an aggregate outstanding principal balance of approximately $1,286,449,664 as of June 1, 2005, together with certain other assets. Capitalized terms used herein and not otherwise defined shall have the meanings assigned to them in the Trust Agreement and the Standard Terms.

Item 9.01. Financial Statements and Exhibits.

(a)

Not applicable.

(b)

Not applicable.

(c)

Exhibits:

4.5.1

Master Servicing and Trust Agreement dated as of June 1, 2005, among GS Mortgage Securities Corp., as Depositor, U.S. Bank National Association, as Trustee, JPMorgan Chase Bank, N.A., as a Custodian, Wells Fargo Bank, N.A., as Securities Administrator, Master Servicer and a Custodian, and Thornburg Mortgage Home Loans, Inc., as Credit Risk Advisor

4.5.2

Standard Terms to Master Servicing and Trust Agreement (June 2005 Edition)

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.

GS MORTGAGE SECURITIES CORP.

By: /s/Michelle Gill

Name: Michelle Gill

Title: Vice President

Dated: June 30, 2005

EXHIBIT INDEX

Exhibit No.

Description

4.5.1

4.5.2

Standard Terms to Master Servicing and Trust Agreement (June 2005 Edition)

GSR Mortgage Loan Trust 2005-AR4 8-K