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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , DC 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 to □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from RETAIL OPPORTUNITY INVESTMENTS CORP . ( Exact name of registrant as specified in its charter ) Commission file number : 001-33749 or RETAIL OPPORTUNITY INVESTMENTS PARTNERSHIP , LP ( Exact name of registrant as specified in its charter ) Commission file number : 333-189057-01 Maryland ( Retail Opportunity Investments Corp. ) Delaware ( Retail Opportunity Investments Partnership , LP ) ( State or other jurisdiction of incorporation or organization ) 11250 El Camino Real San Diego , California ( Address of Principal Executive Offices ) 26-0500600 94-2969738 ( Retail Opportunity Investments Corp. ) ( Retail Opportunity Investments Partnership , LP ) ( I.R.S. Employer Identification No. ) ( 858 ) 677-0900 ( Registrant's telephone number , including area code ) Securities Registered Pursuant to Section 12 ( g ) of the Act : Retail Opportunity Investments Corp. Retail Opportunity Investments Partnership , LP Retail Opportunity Investments Corp. Retail Opportunity Investments Partnership , LP None None 92130 ( Zip Code ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Retail Opportunity Investments Corp. Retail Opportunity Investments Partnership , LP Yes Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Retail Opportunity Investments Corp. Yes Yes Retail Opportunity Investments Partnership , LP 0 Yes Yes 0 0 No No No No Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . 0 0 No ☐ No ☐ Indicate by check mark whether the registrant has submitted electronically , if any , every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) .