Sec Form 4 Filing - CHAPMAN GEORGE L @ National Storage Affiliates Trust - 2021-05-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person CHAPMAN GEORGE L 2. Issuer Name and Ticker or Trading Symbol National Storage Affiliates Trust [ NSA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O NATIONAL STORAGE AFFILIATES TRUST, 8400 EAST PRENTICE AVENUE, 9TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 05/28/2021 (Street) GREENWOOD VILLAGE, CO80111 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class A OP Units ( 1 ) ( 1 ) ( 2 ) 05/28/2021 A 3,726 ( 1 ) ( 1 )( 2 ) ( 3 ) Common shares of beneficial interest, $0.01 par value ( 2 ) 3,726 $ 45.63 ( 4 ) 43,059 ( 1 ) ( 5 ) I See Footnote ( 1 ) LTIP Units ( 1 ) ( 1 ) ( 2 ) 05/28/2021 C 5,032 ( 6 ) ( 1 )( 2 ) ( 3 ) Class A OP Units ( 1 ) ( 2 ) 5,032 ( 1 ) 10,331 ( 1 ) ( 5 ) I See Footnote ( 1 ) ( 6 ) Class A OP Units ( 1 ) ( 1 ) ( 2 ) 05/28/2021 C 5,032 ( 6 ) ( 1 )( 2 ) ( 3 ) Common shares of beneficial interest, $0.01 par value ( 2 ) 5,032 ( 2 ) 43,059 ( 1 ) ( 5 ) I See Footnote ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CHAPMAN GEORGE L C/O NATIONAL STORAGE AFFILIATES TRUST 8400 EAST PRENTICE AVENUE, 9TH FLOOR GREENWOOD VILLAGE, CO80111 X Signatures George L. Chapman, by Jason Parsont, his Attorney-in-fact 06/02/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Consists of 3,726 Class A common units of limited partner interest ("Class A OP Units") in NSA OP, LP (the "Partnership") held by George L. Chapman, Revocable Trust, for the benefit of George L. Chapman, which are issuable upon the conversion of 3,726 long-term incentive plan units ("LTIP Units") in the Partnership. The Reporting Person is trustee and has or shares voting and investment power. The LTIP Units were granted to the Reporting Person under the Issuer's 2015 Equity Incentive Plan, and are scheduled to vest on the earlier of: (i) May 25, 2022 or (ii) the calendar day immediately preceding the next annual meeting of shareholders, the date of which will be specified in a future proxy statement of the Issuer. Vested LTIP Units, after achieving parity with Class A OP Units, are eligible to be converted into Class A OP Units on a one-for-one basis upon the satisfaction of conditions set forth in the Partnership's agreement of limited partnership. ( 2 )Upon conversion of such vested parity LTIP Units into Class A OP Units, the Reporting Person will have the right to cause the Partnership to redeem a portion of the Reporting Person's Class A OP Units for cash in an amount equal to the market value of an equivalent number of the Issuer's common shares of beneficial interest ("Shares"), or at the Issuer's option, Shares on a one-for-one basis, subject to certain adjustments. ( 3 )N/A ( 4 )The price of the derivative securities was determined using the closing price of the Issuer's Shares on May 26, 2021. ( 5 )The Reporting Person's total direct and indirect beneficial ownership following the reported transactions above is 43,059 Class A OP Units, which includes those Class A OP Units previously reported and the Class A OP Units reported herein (together with those other LTIP Units convertible into, or exchangeable for, such Class A OP Units as specified herein and reported in prior Forms 4). Following the reported transactions, the Reporting Person has total direct and indirect beneficial ownership in 6,605 vested LTIP Units and 3,726 unvested LTIP Units. The 43,059 Class A OP Units do not include non-derivative securities of the Reporting Person that were previously reported. ( 6 )Consists of 5,032 LTIP Units held by the George L. Chapman, Revocable Trust, for the benefit of the Reporting Person which were converted into 5,032 Class A OP Units as described in footnote 1 above. The Reporting Person previously reported the 5,032 LTIP Units that were converted into Class A OP Units as described in this Form 4 as Class A OP Units on an as-converted basis. Accordingly, rows 2 and 3 of this Form 4 are being filed on a voluntary basis solely to provide notice of the conversion of the Reporting Person's 5,032 LTIP Units into 5,032 Class A OP Units.

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