Washington, D.C. 20549
Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): December 7, 2017
National Storage Affiliates Trust
(Exact name of registrant as specified in its charter)
(State or other jurisdiction
of incorporation)
(Commission File Number)
(IRS Employer
Identification No.)
5200 DTC Parkway, Suite 200
Greenwood Village, Colorado, 80111
(Address of principal executive offices)
(720) 630-2600
(Registrant's telephone number, including area code)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a‑12)
Pre‑commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d‑2(b))
Pre‑commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e‑4(c))
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2).
Emerging growth company x
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. x

Item 1.01. Entry into a Material Definitive Agreement.
On December 7, 2017, National Storage Affiliates Trust, a Maryland real estate investment trust (the “Company”), and NSA OP, LP, a Delaware limited partnership (the "Operating Partnership"), entered into an underwriting agreement with Jefferies LLC and Morgan Stanley & Co. LLC, as representatives of the several underwriters named in Schedule A thereto, under which the Company agreed to sell, and the underwriters agreed to purchase, subject to the terms and conditions set forth in the underwriting agreement, an aggregate of 5,750,000 of the Company's common shares of beneficial interest, par value $0.01 per share (the "Shares") (including 750,000 Shares pursuant to an option to purchase additional Shares which was exercised in full), at a public offering price of $25.50 per share. The Company received aggregate net proceeds from the offering of approximately $140.3 million after deducting the underwriting discount and estimated offering expenses. The Shares are being offered and sold under a prospectus supplement and accompanying prospectus filed with the U.S. Securities and Exchange Commission pursuant to a shelf registration statement on Form S-3 (File No. 333-211570). The offering closed on December 11, 2017.

A copy of the Underwriting Agreement is attached as Exhibit 1.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01.    Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Tamara D. Fischer
Executive Vice President and Chief Financial Officer

Date: December 12, 2017

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