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Table of Contents CubeSmart CubeSmart , L.P. 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 OR CubeSmart CubeSmart , L.P. TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from CubeSmart : Large accelerated filer Maryland ( CubeSmart ) Delaware ( CubeSmart , L.P. ) ( State or Other Jurisdiction of Incorporation or Organization ) CubeSmart , L.P .: Large accelerated filer 5 Old Lancaster Road Malvern , Pennsylvania ( Address of Principal Executive Offices ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . CubeSmart Yes NO CubeSmart , L.P. Yes NO Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . CubeSmart Yes □ No Yes No CubeSmart , L.P. Title of Each Class Common Shares , $ 0.01 par value per share , of CubeSmart CubeSmart CubeSmart , L.P. 0 Commission file number 001-32324 ( CubeSmart ) Commission file number 000-54462 ( CubeSmart , L.P. ) CUBESMART CUBESMART , L.P. ( Exact Name of Registrant as Specified in Its Charter ) Registrant's telephone number , including area code ( 610 ) 535-5000 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 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 . Yes Yes Accelerated filer 0 Securities registered pursuant to Section 12 ( g ) of the Act : Units of General Partnership Interest of CubeSmart , L.P. NO NO CUBE Indicate by check mark whether the registrant has submitted electronically 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 ) . to Yes No Yes No 20-1024732 ( CubeSmart ) 34-1837021 ( CubeSmart , L.P. ) ( IRS Employer Identification No. ) Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act : Non - accelerated . filer 19355 ( Zip Code ) Name of Each Exchange on Which Registered New York Stock Exchange CubeSmart CubeSmart , L.P. Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . CubeSmart Yes No Ⓡ Yes □ NOⓇ CubeSmart , L.P. Smaller reporting company Accelerated filer 0 Non - accelerated Smaller reporting company Emerging growth company filer If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Emerging growth company Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . As of June 30 , 2020 , the last business day of CubeSmart's most recently completed second fiscal quarter , the aggregate market value of common shares held by non - affiliates of CubeSmart was $ 5,228,744,387 . As of February 24 , 2021 , the number of common shares of CubeSmart outstanding was 199,699,623 . As of June 30 , 2020 , the last business day of CubeSmart , L.P.'s most recently completed second fiscal quarter , the aggregate market value of the 1,872,308 units of limited partnership ( the " OP Units " ) held by non - affiliates of CubeSmart , L.P. was $ 50,533,593 based upon the last reported sale price of $ 26.99 per share on the New York Stock Exchange on June 30 , 2020 of the common shares of CubeSmart , the sole general partner of CubeSmart , L.P. ( For this computation , the market value of all OP Units beneficially owned by CubeSmart has been excluded . ) Documents incorporated by reference : Portions of the Proxy Statement for the 2021 Annual Meeting of Shareholders of CubeSmart to be filed subsequently with the SEC are incorporated by reference into Part III of this report .