UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the fiscal year ended December 31, 2012

or

For the transition period from                      to                     

Commission file number

333-171508-01

(Commission File Number of issuing entity)

GS Mortgage Securities Trust 2011-GC5

(Exact name of issuing entity as specified in its charter)

333-171508

(Commission File Number of depositor)

GS Mortgage Securities Corporation II

(Exact name of depositor as specified in its charter)

Goldman Sachs Mortgage Company

Citigroup Global Markets Realty Corp.

(Exact name of sponsor as specified in its charter)

c/o Citibank, N.A.

388 Greenwich Street, 14^th Floor

New York, New York 10013

(Address of principal executive offices of issuing entity)

(212) 816-5614

Registrant’s telephone number, including area code

Securities registered pursuant to Section 12(b) of the Act: None

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    x  No

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    ¨  Yes    x   No

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.    x  Yes    ¨  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).

Not Applicable

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) 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.

Not Applicable

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

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

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter.

Not Applicable

Indicate by check mark whether the registrant has filed all documents and reports required to be filed by Section 12, 13 or 15(d) of the Securities Exchange Act of 1934 subsequent to the distribution of securities under a plan confirmed by a court.

Not Applicable

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.

Not Applicable

DOCUMENTS INCORPORATED BY REFERENCE

List hereunder the following documents if incorporated by reference and the Part of the Form 10-K (e.g., Part I, Part II, etc.) into which the document is incorporated: (1) Any annual report to security holders; (2) Any proxy or information statement; and (3) Any prospectus filed pursuant to Rule 424(b) or (c) under the Securities Act of 1933. The listed documents should be clearly described for identification purposes (e.g., annual report to security holders for fiscal year ended December 24, 1980).

Not Applicable

PART I

Item 1. Business.

Omitted.

Item 1A. Risk Factors.

Omitted.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Omitted.

Item 3. Legal Proceedings.

Omitted.

Item 4. Mine Safety Disclosures.

Not Applicable

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Omitted.

Item 6. Selected Financial Data.

Omitted.

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Omitted.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Omitted.

Item 8. Financial Statements and Supplementary Data.

Omitted.

Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

Omitted.

Item 9A. Controls and Procedures.

Omitted.

Item 9B. Other Information.

None.

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

Omitted.

Item 11. Executive Compensation.

Omitted.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Omitted.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Omitted.

Item 14. Principal Accounting Fees and Services.

Omitted.

ADDITIONAL DISCLOSURE ITEMS REQUIRED BY GENERAL INSTRUCTION J(2)

Item 1112(b) of Regulation AB, Significant Obligor or Pool Assets Financial Information

The Park Place Mall mortgage loan (Control #1 on Annex A of the prospectus supplement of the Registrant relating to the issuing entity filed on October 11, 2011 pursuant to Rule 424(b)(5)) constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB. In accordance with Item 1112(b) of Regulation AB, the most recent unaudited net operating income of the significant obligor was $19,709,704 for the twelve month period ended December 31, 2012.

The 1551 Broadway mortgage loan (Control #2 on Annex A of the prospectus supplement of the Registrant relating to the issuing entity filed on October 11, 2011 pursuant to Rule 424(b)(5)) constitutes a significant obligor within the meaning of Item 1101(k)(2) of Regulation AB. In accordance with Item 1112(b) of Regulation AB, the most recent unaudited net operating income of the significant obligor was $15,925,656 for the twelve month period ended December 31, 2012.

American Eagle Outfitters, Inc., the guarantor of the lease of the sole tenant at the mortgaged property that secures the 1551 Broadway mortgage loan (Control #2 on Annex A of the prospectus supplement of the Registrant relating to the issuing entity filed on October 11, 2011 pursuant to Rule 424(b)(5)), constitutes a significant obligor within the meaning of Item 1101(k)(1) of Regulation AB. Set forth in the table below is the information required under Item 1112(b) of Regulation AB with respect to such significant obligor:

Item 1114(b)(2) and Item 1115(b) of Regulation AB, Significant Enhancement Provider Financial Information

No entity or group of affiliated entities provides any external credit enhancement, uses any derivative instruments or other support for the certificates within this transaction.

Item 1117 of Regulation AB, Legal Proceedings

The registrant knows of no pending legal proceedings involving the issuing entity and all parties related to the issuing entity or any other entities contemplated by Item 1117 of Regulation AB that would be material to Certificateholders, other than routine litigation incidental to the duties of those respective parties.

Item 1119 of Regulation AB, Affiliations and Certain Relationships and Related Transactions

Provided previously in the prospectus supplement of the Registrant relating to the issuing entity and filed on October 11, 2011 pursuant to Rule 424 of the Securities Act of 1933, as amended.

Item 1122 of Regulation AB, Compliance with Applicable Servicing Criteria

The reports on assessment of compliance with servicing criteria for asset-backed securities and related attestation reports are attached hereto under Item 15. Attached as Exhibit O to the Pooling and Servicing Agreement and incorporated by reference as Exhibit 4 to this report is a chart identifying the entities participating in the servicing function for the transaction responsible for each applicable servicing criteria set forth in 1122(d).

Item 1123 of Regulation AB, Servicer Compliance Statement

The servicer compliance statements are attached hereto under Item 15.

PART IV

Item 15. Exhibits, Financial Statement Schedules.

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 29, 2013

EXHIBIT INDEX