Company: NSA-PB
Filing Date: 2025-03-28
Form Type: DEF 14A
Source: 0001628280-25-015431
Chunk: 1

Company: National Storage Affiliates Trust
Filing Date: 2025-03-28
Form: DEF 14A
Chunk 1
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 and dedication of our over 1,400 employees. We remain diligently focused in 2025 on realizing the expected accretion that was contemplated from the internalization of the PRO structure and steadfast in our commitment to drive value for our shareholders and all stakeholders.

Our commitment to board refreshment was an additional milestone in 2024, as we welcomed a new independent trustee, Warren Allan, to our Board of Trustees in August, in conjunction with the resignation of trustee Mark Van Mourick. In February of this year, one of our current trustees, Rebecca Steinfort, informed the Board that she will not be standing for re-election at our 2025 annual meeting of shareholders, at which time the size of the board will decrease from 12 to 11 trustees.

We hope this summary will be helpful as you consider your vote ahead of our 2025 annual meeting of shareholders, which will be held virtually on Monday, May 12, 2025 at 11:00 a.m., mountain daylight time. We are pleased to invite you to attend that meeting and, in all events, we encourage you to have your say in our governance and direction by voting your shares.

Thank you for your continued support and investment in National Storage Affiliates.

| Tamara D. Fischer     
 Executive Chairperson |     | David G. Cramer                                
 President, Chief Executive Officer and Trustee |

### NOTICE OF ANNUAL MEETING OF SHAREHOLDERS

#### May 12, 2025
To the Shareholders of National Storage Affiliates Trust:

We invite you to attend the 2025 annual meeting of shareholders (the "Annual Meeting") of National Storage Affiliates Trust, a Maryland real estate investment trust (the "Company," "NSA," "we," "our" or "us").

| Meeting Date:      |     | May 12, 2025                                                                                              |
|:-------------------|:----|:----------------------------------------------------------------------------------------------------------|
| Time:              |     | 11:00 a.m., Mountain Daylight Time (MDT)                                                                  |
| Location:          |     | The Annual Meeting will be held virtually at www.virtualshareholdermeeting.com/NSA2025.                   |
| Record Date:       |     | March 14, 2025                                                                                            |
| Items of Business: |     | 1.    Election of Eleven Trustees to the Company's Board of Trustees                                      |
|                    |     | 2.  Ratification of Appointment of KPMG LLP as our