As previously disclosed, on April 2, 2023, Life Storage, Inc. (Life Storage) and Life Storage OP (Life Storage OP and, together
with Life Storage, the Life Storage Parties) entered into an Agreement and Plan of Merger (the Merger Agreement) with Extra Space Storage Inc., a Maryland corporation (Extra Space), Extra Space Storage LP, a
Delaware limited partnership (Extra Space OP), Eros Merger Sub, LLC, a Delaware limited liability company and a wholly owned subsidiary of Extra Space (Extra Space Merger Sub) and Eros OP Merger Sub, LLC, a Delaware limited
liability company and a wholly owned subsidiary of Extra Space OP (Extra Space OP Merger Sub and, together with Extra Space, Extra Space OP and Extra Space Merger Sub, the Extra Space Parties), as amended on May 18,
2023. The Merger Agreement provides for, subject to the terms and conditions thereof, the combination of Life Storage and Extra Space through a series of transactions including, among others, (i) a merger of Extra Space Merger Sub with and into
Life Storage, with Life Storage continuing as the surviving entity and a wholly owned subsidiary of Extra Space (the Company Merger) and (ii) a merger of Extra Space OP Merger Sub with and into Life Storage OP, with Life Storage OP
continuing as the surviving entity and a wholly owned indirect subsidiary of Extra Space OP (the Partnership Merger and, together with the Company Merger, the Mergers).
In connection with the Mergers, Extra Space filed a registration statement on Form S-4
(333-272152) (as amended, the Registration Statement) with the Securities and Exchange Commission (the SEC). On June 6, 2023, the Registration Statement was declared effective by
the SEC. On June 6, 2023, Life Storage and Extra Space filed a joint proxy statement/prospectus with respect to the special meetings of stockholders of Life Storage and Extra Space which has been disseminated to Life Storage stockholders and
Extra Space stockholders (the Joint Proxy Statement/Prospectus).
Since the initial filing of the Registration Statement, five purported
holders of Life Storage common stock filed substantially similar complaints against Life Storage and the members of the Life Storage board of directors in the United States District Court for the Southern District of New York. The complaints are
captioned as follows: Tanner v. Life Storage, Inc. et al., No. 1:23-cv-04728 (filed June 5, 2023); ODell v. Life Storage, Inc. et al., No. 23-cv-4878 (filed June 9, 2023); Gallaher v. Life Storage, Inc. et al., No.
1:23-cv-04871 (filed June 9, 2023); Finger v. Life Storage, Inc. et al., No.
1:23-cv-05071 (filed June 15, 2023); and Ballard v. Life Storage, Inc. et al., No
1:23-cv-05088 (filed June 16, 2023) (collectively, the Actions). The complaints in the Actions allege that Life Storage and the Life Storage board of
directors violated federal securities laws by omitting or misstating material information in the Joint Proxy Statement/Prospectus, rendering the Joint Proxy Statement/Prospectus materially deficient. The plaintiffs in the Actions seek, among other
things, (i) to enjoin the transaction until the alleged deficiencies in the Joint Proxy Statement/Prospectus are corrected, and (ii) attorneys and experts fees and costs in connection with the lawsuit.
The defendants believe that the Actions are without merit. The defendants deny that any further disclosure beyond that already contained in the Joint Proxy
Statement/Prospectus is required under applicable law to supplement the Joint Proxy Statement/Prospectus. Nonetheless, to avoid the risk that the Actions may delay or otherwise adversely affect the consummation of the Mergers and to minimize the
expense of defending such Actions, the defendants are making the following supplemental disclosures (the litigation-related supplemental disclosures) to the Joint Proxy Statement/Prospectus. Nothing in this Report shall be deemed an
admission of the legal necessity or materiality under applicable laws of any of the supplemental disclosures set forth herein.
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SUPPLEMENT TO JOINT PROXY STATEMENT/PROSPECTUS
The litigation-related supplemental disclosures contained below supplement the Joint Proxy Statement/Prospectus and should be read in conjunction with the
Joint Proxy Statement/Prospectus, which is available on the Internet site maintained by the SEC at http://www.sec.gov, along with periodic reports and other information Extra Space and Life Storage file with the SEC. To the extent that the
information set forth herein differs from or updates information contained in the Joint Proxy Statement/Prospectus, the information set forth herein shall supersede or supplement the information in the Joint Proxy Statement/Prospectus. All page
references are to pages in the Joint Proxy Statement/Prospectus, and terms used below, unless otherwise defined, have the meanings set forth in the