As filed with the Securities and Exchange Commission on November 15, 2011

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

HANMI FINANCIAL CORPORATION

(Exact name of Registrant as specified in its charter)

Hanmi Financial Corporation

3660 Wilshire Boulevard, Penthouse Suite A

Los Angeles, California 90010

(213) 382-2200

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

Jay S. Yoo

Hanmi Financial Corporation

3660 Wilshire Boulevard, Penthouse Suite A

Los Angeles, California 90010

(213) 382-2200

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

Copies to:

Mark J. Kelson, Esq.

Greenberg Traurig, LLP

2450 Colorado Avenue, Suite 400 East

Santa Monica, California 90404

(310) 586-7700 (phone)

(310) 586-7800 (facsimile)

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

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.    ¨

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, other than securities offered only in connection with dividend or interest reinvestment plans, 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, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.    x File No. 333-163206

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 registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.    ¨

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.    ¨

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 definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Securities Exchange Act. (check one):

CALCULATION OF REGISTRATION FEE

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

EXPLANATORY NOTE AND INCORPORATION BY REFERENCE

This Registration Statement is filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended, and General Instruction IV(A) of Form S-3 to register an additional $5,300,000 of common stock, $0.001 par value per share, of Hanmi Financial Corporation (the “Company”). This Registration Statement relates to the Registration Statement on Form S-3 of the Company (File No. 333-163206) filed with the Securities and Exchange Commission on November 19, 2009, as amended, which was previously declared effective by the Securities and Exchange Commission on November 30, 2009, at 4:30 p.m. The contents of the Company’s Registration Statement (File No. 333-163206) are hereby incorporated by reference into this Registration Statement in its entirety, including all exhibits thereto and each of the documents the Company filed with the Securities and Exchange Commission and incorporated or deemed to be incorporated by reference therein.

Item 16. Exhibits

The following exhibits are filed with or incorporated by reference into this Registration Statement:

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Los Angeles, California, on the 15th day of November, 2011.

Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.

EXHIBIT INDEX