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 12, 2013

FIRST REGIONAL BANCORP

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (310) 839—2083

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 June 12, 2013, First Regional Bancorp (the “Company”) filed its monthly operating report for the period beginning May 1, 2013 and ending May 31, 2013 (the “May Report”) with the United States Bankruptcy Court for the Central District of California (the “Bankruptcy Court”). The May Report is attached to this Current Report on Form 8-K as Exhibit 99.1 and incorporated by reference herein.

Cautionary Statements Regarding May Report

The May Report is limited in scope, covers only a one-month time period and has been prepared solely for the purpose of the Company’s compliance with the monthly reporting requirements of the Bankruptcy Court. The May Report contains financial information that (i) has not been audited or reviewed by an independent registered public accounting firm; (ii) is not presented in accordance with generally accepted accounting principles in the United States of America; and (iii) may be subject to future reconciliation, adjustments or other modification or amendment. The information contained in the May Report has been prepared in accordance with applicable laws and regulations under Chapter 11 of Title 11 of the United States Code and is not to be used for investment purposes. There can be no assurance that the May Report is complete. The Company may amend or otherwise change the information contained in the May Report at a future date. The operating results set forth in the May Report should not be viewed as indicative of the Company’s future results.

The May Report should under no circumstances be relied upon or viewed as a substitute, supplement or replacement for financial information that is filed with the U.S. Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The May Report contains information for periods which may be shorter or otherwise different from those contained in reports required pursuant to the Exchange Act. The May Report does not include footnotes that would ordinarily be contained in the financial statements in the Company’s quarterly and annual reports pursuant to the Exchange Act.

Forward-Looking Statements

This Current Report on Form 8-K and the exhibit hereto may contain certain forward-looking statements. These forward-looking statements are subject to various risks and uncertainties, many of which are beyond the Company’s control, which could cause actual results to differ materially from such statements. Unless legally required, the Company disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

SIGNATURES

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 hereunto duly authorized.