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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Maryland ( State or other jurisdiction of incorporation or organization ) 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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from One Federal Street 23rd Floor Boston , Massachusetts ( Address of principal executive offices ) FORM 10 - K Commission file number 1-34907 to STAG INDUSTRIAL , INC . ( Exact name of registrant as specified in its charter ) Title of each class Common Stock , $ 0.01 par value 6.875 % Series C Cumulative Redeemable Preferred Stock , $ 0.01 par value ( 617 ) 574-4777 ( Registrant's telephone number , including area code ) Not Applicable ( Former name , former address and former fiscal year , if changed since last report ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) STAG STAG - PC 27-3099608 ( IRS Employer Identification No. ) 02110 ( Zip code ) Name of each exchange on which registered New York Stock Exchange New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes > No Indicate by check mark if the registrant is not required to file reports to Section 13 or Section 15 ( d ) of the Exchange Act . Yes 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 . Yes > No 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 ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes > 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 the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Accelerated filer Non - accelerated filer Smaller reporting company Emerging growth company 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 . 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 . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes No > The aggregate market value of the voting and non - voting common equity held by non - affiliates of the registrant was approximately $ 4,360 million based on the closing price on the New York Stock Exchange as of June 30 , 2020 . Number of shares of the registrant's common stock outstanding as of February 9 , 2021 : 158,399,472 Number of shares of 6.875 % Series C Cumulative Redeemable Preferred Stock as of February 9 , 2021 : 3,000,000 DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant's definitive Proxy Statement with respect to its 2021 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant's fiscal year are incorporated by reference into Part II , Item 5 and Part III , Items 10 , 11 , 12 , 13 and 14 hereof as noted therein .