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 AND EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): April 13, 2011

NARA BANCORP, INC.

(Exact name of registrant as specified in its charter)

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:

On April 13, 2011, Nara Bancorp, Inc. (“Nara Bancorp”) and Center Financial Corporation (“Center Financial”) amended their previously reported Agreement and Plan of Merger, dated December 9, 2010, to amend certain of the provisions relating to the concurrent merger of their respective subsidiary banks (the “Amendment”). The Amendment is attached hereto as Exhibit 1.1.

Additional Information and Where to Find It

In connection with the proposed merger, Nara Bancorp filed with the Securities and Exchange Commission the (“SEC”) a registration statement on Form S-4 (the “Registration Statement”) that includes a Joint Proxy Statement/Prospectus of Nara Bancorp and Center Financial, as well as other relevant documents concerning the proposed transaction. A definitive Joint Proxy Statement/Prospectus will be mailed to stockholders of Nara Bancorp and Center Financial after the Registration Statement is declared effective. Stockholders are urged to read the Registration Statement and the definitive Joint Proxy Statement/Prospectus regarding the merger when it becomes available and any other relevant documents filed with the SEC, as well as any amendments or supplements to those documents, because they will contain important information. You will be able to obtain a free copy of the Registration Statement and the definitive Joint Proxy Statement/Prospectus (when the registration statement in which it is included is declared effective), as well as other filings containing information about Nara Bancorp and Center Financial at the SEC’s Internet site (www.sec.gov). You will also be able to obtain these documents, free of charge, from Nara Bancorp at www.narabank.com under the tab “Investor Relations” and then under the heading “SEC Filings” and from Center Financial at www.centerbank.com under the tab “Investor Relations” and then under the heading “SEC Filings.”

Participants in Solicitation

Nara Bancorp, Center Financial and their respective directors, executive officers, management and employees may be deemed to be participants in the solicitation of proxies in respect of the merger. Information concerning Nara Bancorp’s participants is set forth in the proxy statement, dated May 24, 2010, for Nara Bancorp’s 2010 annual meeting of stockholders as filed with the SEC on Schedule 14A. Information concerning Center Financial’s participants is set forth in the proxy statement, dated April 30, 2010, for Center Financial’s 2010 annual meeting of stockholders as filed with the SEC on Schedule 14A. Additional information regarding the interests of participants of Nara Bancorp and Center Financial in the solicitation of proxies in respect of the merger is included in the Registration Statement filed with the SEC and will be included in the definitive Joint Proxy Statement/Prospectus regarding the merger when it becomes available.

The exhibit number corresponds with Item 601(a) of Regulation S-K.

Pursuant to the requirements 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: April 15, 2011