Extra Space Storage is a self-administered and self-managed real estate investment trust headquartered in Salt Lake City, Utah, trading on the New York Stock Exchange under the ticker symbol EXR as a member of the S&P 500. Founded in 1977 by Kenneth Woolley, the company operates as the largest self-storage operator in the United States. Extra Space Storage owns and operates facilities under multiple brands including Extra Space Storage, Life Storage, and Storage Express. The company provides self-storage solutions including climate-controlled units, drive-up units, boat storage, RV storage, and business storage across its portfolio. As of 2025, Extra Space owns or manages over 4,200 properties spanning 43 states and Washington, D.C., comprising approximately 2.6 million units and 283.4 million square feet of rentable space. The company completed a merger with Life Storage in July 2023 for $15 billion, which doubled its store count since 2021. Extra Space Storage also operates the self-storage industry's largest third-party management platform, Management Plus, managing over 1,800 properties for independent owners. The company maintains a diversified capital investment strategy including acquisitions, joint ventures, bridge lending, and preferred equity investments. Extra Space Storage has installed solar systems at more than 800 facilities and holds a BBB investment-grade credit rating from S&P Global Ratings.