As filed with the Securities and Exchange Commission on July 26, 2013

Registration No. 333-                

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-1

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

DEL FRISCO’S RESTAURANT GROUP, INC.

(Exact name of registrant as specified in its charter)

930 S. Kimball Ave., Suite 100

Southlake, TX 76092

(817) 601-3421

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Mark S. Mednansky

Chief Executive Officer

Del Frisco’s Restaurant Group, Inc.

930 S. Kimball Ave., Suite 100

Southlake, TX 76092

(817) 601-3421

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box:  ¨

If this form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering:  x 333-189969

If this form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ¨

If this form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering:  ¨

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. (Check one):

CALCULATION OF REGISTRATION FEE

The Registration Statement shall become effective upon filing in accordance with Rule 462(b) under the Securities Act of 1933, as amended.

EXPLANATORY NOTE

This Registration Statement is being filed pursuant to Rule 462(b) as promulgated under the Securities Act of 1933, as amended, and includes the registration statement facing page, this page, the signature page, an exhibit index and the required opinion and consents solely to register an additional 1,150,000 shares of the registrant’s common stock, par value $0.001 per share. The contents of the Registration Statement on Form S-1 (Registration No. 333-189969), including the exhibits and power of attorney thereto, which was declared effective by the Securities and Exchange Commission on July 25, 2013, are incorporated by reference in this Registration Statement.

CERTIFICATION

The registrant hereby certifies to the Securities and Exchange Commission that (1) it has instructed its bank to pay the filing fee set forth on the cover page of this Registration Statement by a wire transfer of such amount to the Commission’s account at Mellon Bank as soon as practicable (but no later than the close of business as of July 26, 2013), (2) it will not revoke such instructions, (3) it has sufficient funds in the relevant account to cover the amount of such filing fee and (4) it will confirm receipt of such instructions by its bank during regular business hours no later than July 26, 2013.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Southlake, State of Texas, on July 25, 2013.

Pursuant to the requirements of the Securities Act of 1933, the following persons have signed this Registration Statement in the capacities and on the date indicated.

EXHIBIT INDEX