Amendment to Schedule 13D Filing for National Storage Affiliates Trust

This filing is an amendment to a Schedule 13D related to the common shares of National Storage Affiliates Trust. Arlen D. Nordhagen, the vice chairperson of the board of trustees, is the reporting person. As of March 18, 2026, Mr. Nordhagen beneficially owns approximately 8.43% of the Issuer's outstanding common shares, which includes common shares held directly and indirectly through various entities and units. The amendment also discloses a Merger Agreement entered into on March 16, 2026, involving National Storage Affiliates Trust, NSA OP, LP, Public Storage, and related entities. This agreement outlines a merger plan, including a company merger and a partnership merger. Concurrently, Mr. Nordhagen entered into an Election and Support Agreement with Public Storage, agreeing to vote in favor of the mergers and to have a portion of his Class A OP Units redeemed and converted into units of the Dropdown JV. The filing details the reporting person's voting and dispositive power over the securities and provides information on the exchange and conversion rights of various units.