SmartStop Self Storage REIT, Inc. (“SmartStop”) (NYSE: SMA), an internally managed real estate investment trust and a premier owner and operator of self-storage facilities in the United States and Canada, will be added to the Russell 3000® Index following the annual reconstitution of the Russell indexes, effective after the market closes on Friday, June 27, 2025.

SmartStop’s inclusion follows its April 2025 listing on the New York Stock Exchange and marks a significant achievement in its growth as a publicly traded enterprise. The Russell 3000 Index captures the largest 3,000 U.S.-traded stocks by market capitalization and serves as the foundation for additional subindexes, including the Russell 1000® and Russell 2000® Indexes. Final placement in one of these subindexes will be based on SmartStop’s relative market capitalization.

“Joining the Russell indexes is a significant milestone for SmartStop as a newly listed company,” said H. Michael Schwartz, Chairman and CEO of SmartStop. “It reflects the progress we’ve made and the scale of our platform. We believe this inclusion will help increase our visibility among institutional investors as we continue executing our growth strategy.”

About SmartStop Self Storage REIT, Inc. (SmartStop):

SmartStop Self Storage REIT, Inc. (“SmartStop”) (NYSE: SMA) is a self-managed REIT with a fully integrated operations team of approximately 590 self-storage professionals focused on growing the SmartStop® Self Storage brand. SmartStop, through its indirect subsidiary SmartStop REIT Advisors, LLC, also sponsors other self-storage programs. As of May 30, 2025, SmartStop has an owned or managed portfolio of 221 operating properties in 23 states, the District of Columbia, and Canada, comprising approximately 157,600 units and 17.7 million rentable square feet. SmartStop and its affiliates own or manage 41 operating self-storage properties in Canada, which total approximately 34,400 units and 3.5 million rentable square feet. Additional information regarding SmartStop is available at www.smartstopselfstorage.com

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