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): December 3, 2014

RETAIL OPPORTUNITY INVESTMENTS CORP.

(Exact Name of Registrant as Specified in Its Charter)

RETAIL OPPORTUNITY INVESTMENTS PARTNERSHIP, LP

(Exact Name of Registrant as Specified in Its Charter)

Registrant’s telephone number, including area code: (858) 677-0900

Not applicable

(Former name or former address, if changed since last report)

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:

Item 1.01 Entry into a Material Definitive Agreement.

On December 3, 2014, Retail Opportunity Investments Partnership, LP (the “Issuer”) closed its previously announced registered underwritten public offering of $250.0 million aggregate principal amount of 4.000% Senior Notes due 2024 (the “Notes”), fully and unconditionally guaranteed by Retail Opportunity Investments Corp. (the “Company”). The Notes were sold pursuant to the Company’s and the Issuer’s effective shelf registration statement on Form S-3ASR (File Nos. 333-189057 / 333-189057-01) filed on June 3, 2013 and the related prospectus dated June 3, 2013, as supplemented by the prospectus supplement dated November 18, 2014. The Notes are governed by the Indenture, dated as of December 9, 2013 (the “Base Indenture”) by and among the Company, the Issuer and Wells Fargo Bank, National Association, as trustee (the “Trustee”), as supplemented by the Second Supplemental Indenture, dated as of December 3, 2014, by and among the Issuer, the Company and the Trustee (the “Second Supplemental Indenture” and, together with the Base Indenture, the “Indenture”).

The Notes pay interest semi-annually on June 15 and December 15, commencing on June 15, 2015, at a rate of 4.000% per annum, and mature on December 15, 2024, unless redeemed earlier by the Issuer. The Notes are the Issuer’s senior unsecured obligations that rank equally in right of payment with the Issuer’s other unsecured indebtedness, and effectively junior to (i) all of the indebtedness and other liabilities, whether secured or unsecured, and any preferred equity of the Issuer’s subsidiaries, and (ii) all of the Issuer’s indebtedness that is secured by the Issuer’s assets, to the extent of the value of the collateral securing such indebtedness outstanding. The Company fully and unconditionally guarantees the Issuer’s obligations under the Notes on a senior unsecured basis, including the due and punctual payment of principal of, and premium, if any, and interest on, the notes, whether at stated maturity, upon acceleration, notice of redemption or otherwise. The guarantee is a senior unsecured obligation of the Company and ranks equally in right of payment with all other senior unsecured indebtedness of the Company. The Company’s guarantee of the Notes is effectively subordinated in right of payment to all liabilities, whether secured or unsecured, and any preferred equity of its subsidiaries (including the Issuer and any entity the Company accounts for under the equity method of accounting).

The above description of the Indenture does not purport to be a complete statement of the parties’ rights and obligations under the Indenture and is qualified in its entirety by reference to the terms of the Base Indenture, previously filed and incorporated by reference herein, and the Supplemental Indenture attached hereto as Exhibit 4.2 and incorporated by reference herein.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

The information in Item 1.01 is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.