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, 2019 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) (State or other jurisdiction of incorporation or ...

National Storage Affiliates Trust (NYSE:NSA) Q4 2019 Results Earnings Conference Call February 25, 2020 11:00 AM ET Company Participants George Hoglund - Vice President of Investor Relations Arlen Nordhagen - Executive Chairman Tamara Fischer - President and Chief Executive Officer Brandon Togashi - Chief Financial Officer Conference Call Participants Jon Petersen - Jefferies Neil Malkin - Capital One Securities RJ Milligan - Robert W. Baird Todd Thomas - KeyBanc Capital Markets Michael Bilerman - Citi Rona ...

PROGRESS Third Quarter 2019 Earnings Release & Supplemental Financial Information NATIONAL STORA GE Table of Contents Page 1 Earnings Release 7 Consolidated Statements of Operations 8 Consolidated Balance Sheets Schedule 1 - Funds From Operations and Core Funds From Operations 9 Schedule 2 - Other Non-GAAP Financial Measurements 11 Schedule 3 - Portfolio Summary 12 Schedule 4 - Debt and Equity Capitalization 14 Schedule 5 - Summarized Information for Unconsolidated Real Estate Ventures 16 Schedule 6 - Same ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 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) (State or other jurisdiction of incorpo ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 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) (State or other jurisdiction of incorporatio ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 001-37351 National Storage Affiliates Trust (Exact name of Registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Maryland 46-50 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 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) (State or other jurisdiction of incorporation or ...