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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-14788 Blackstone Mortgage Trust Blackstone Mortgage Trust , Inc. ( Exact name of Registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) 94-6181186 ( I.R.S. Employer Identification No. ) 345 Park Avenue , 15th Floor New York , New York 10154 ( Address of principal executive offices ) ( Zip Code ) Registrant's telephone number , including area code : ( 212 ) 655-0220 Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbol ( s ) BXMT Title of each class Yes 图 No Yes □ No 区 Class A common stock , par value $ 0.01 per share 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 . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Indicate by check mark whether the regis ( 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 . 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 Yes 冈 No □ Accelerated filer Non - accelerated filer Name of each exchange on which registered New York Stock Exchange 0 Smaller reporting company Emerging growth company 0 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 Act ) . Yes □ No 区 DOCUMENTS INCORPORATED BY REFERENCE The aggregate market value of the outstanding class A common stock held by non - affiliates of the registrant was approximately $ 3.3 billion as of June 30 , 2020 ( the last business day of the registrant's most recently completed second fiscal quarter ) based on the closing sale price on the New York Stock Exchange on that date . As of February 3 , 2021 , there were 147,039,855 outstanding shares of class A common stock . Part III of this annual report on Form 10 - K incorporates information by reference from the registrant's definitive proxy statement with respect to its 2021 annual meeting of stockholders to be filed with the Securities and Exchange Commission within 120 days after the close of the registrant's fiscal year .