X0508 4 2025-06-24 0 0001585389 SmartStop Self Storage REIT, Inc. SMA 0001462183 Morris Timothy S. 10 TERRACE ROAD LADERA RANCH CA 92694 1 0 0 0 0 Common Stock 2025-06-24 4 A 0 2688 0 A 2688 D Class A Common Stock 9166 D Class A Common Stock 12490.9 D The Reporting Person was awarded 2,688 shares of restricted stock upon his reelection to the board of directors, which shares vest one year from such reelection. Represents 9,166 shares of restricted Class A Common Stock previously reported as being owned by the Reporting Person, which shares vest ratably over four years commencing on the first anniversary of the issuance thereof, subject to the Reporting Person's continued service through each vesting date. Represents 12,490.90 shares of Class A Common Stock previously reported as being owned by the Reporting Person. The shares were issued to the Reporting Person in connection with his reelection to the board of directors and vest one year from each such reelection. /s/ Timothy S. Morris 2025-06-26