Page 1

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 OR □ 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 : 001-37351 National Storage Affiliates Trust ( Exact name of Registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) 8400 East Prentice Avenue , 9th Floor Greenwood Village , Colorado 80111 ( Address of principal executive offices ) ( Zip code ) ( 720 ) 630-2600 ( Registrant's telephone number including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading symbols Name of each exchange on which registered New York Stock Exchange Title of each class Common Shares of Beneficial Interest , $ 0.01 par value per share Series A Cumulative Redeemable Preferred Shares of Beneficial Interest , par value $ 0.01 per share NSA 46-5053858 ( I.R.S. Employer Identification No. ) NSA Pr A New York Stock Exchange 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 pursuant to Section 13 or Section 15 ( d ) of the 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 .