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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K Delaware ( State or other jurisdiction of incorporation or organization ) For the transiti period from 345 Park Avenue , 31st Floor New York , New York ( Address of principal executive offices ) For the fiscal year ended December 31 , 2020 OR Blackstone Secured Lending Fund ( Exact name of Registrant as specified in its Charter ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class None Commission File Number 814-01299 □ □ to Trading Symbol ( s ) Registrant's telephone number , including area code : ( 212 ) 503-2100 None 82-7020632 ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : Common shares of beneficial interest , par value $ 0.001 10154 ( Zip Code ) Name of each exchange on which registered None YES NO > NO 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 . YES 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 , smaller reporting company , or an emerging growth company . See the definition of " large accelerated filer " , " accelerated filer " , " smaller reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act : Large accelerated filer Non - accelerated filer 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 . □ Accelerated filer Smaller reporting company |