X0306 4 2023-03-02 0 0001585389 SmartStop Self Storage REIT, Inc. n/a 0001781316 Barry James R. 10 TERRACE ROAD LADERA RANCH CA 92694 0 1 0 0 CFO and Treasurer Class A Common Stock 2023-03-02 4 A 0 5112.4 0 A 13682.3 D Class A Common Stock 2023-03-02 4 F 0 1767.86 0 D 11914.44 D Long-Term Incentive Plan Units 0 Class A Common Stock 53894.48 53894.48 D Long-Term Incentive Plan Units 0 Class A Common Stock 37486.75 37486.75 D Class A-1 Units 0 Class A Common Stock 123766 123766 D Includes shares of restricted stock previously reported as being owned by the Reporting Person, which shares of restricted stock were subject to vesting based on the achievement of specified performance measures. The actual number of shares of restricted stock to be issued upon vesting could range from 0% to 200% of the number of shares of restricted stock reported based on the actual performance measure achieved. On March 2, 2023, the Compensation Committee of the Issuer's Board of Directors determined that a performance measure had been achieved such that 200% of the number of shares of restricted stock previously reported should vest. Accordingly, on March 2, 2023, 2,556.2 shares of restricted stock previously reported as being owned by the Reporting Person vested, and an additional 2,556.2 shares of restricted stock were issued to the Reporting Person. Represents 1,767.86 shares of restricted stock being withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting and net settlement of shares of restricted stock previously reported as being owned by the Reporting Person. Represents long-term incentive plan units ("LTIP Units") of SmartStop OP, L.P., the Issuer's operating partnership (the "Operating Partnership"). Vested LTIP Units are convertible into Class A common units of the Operating Partnership ("Class A Common Units"). Class A Common Units are redeemable by the holder for, at the election of the Issuer, shares of Class A Common Stock of the Issuer on a one-for-one basis or the cash value of such shares. Represents 53,894.48 LTIP Units previously reported as being owned by the Reporting Person. The LTIP Units vest ratably over a four-year period commencing on December 31 of the year of grant, subject to the Reporting Person's continued employment or service through each vesting date. Represents 37,486.75 LTIP Units previously reported as being owned by the Reporting Person, which number is equal to 200% of the target number of LTIP Units to be issued upon vesting. The actual number of LTIP Units to be issued upon vesting can range from 0% to 100% of the number of LTIP Units reported, based on achievement of specified performance measures. Represents Class A-1 limited partnership units ("Class A-1 Units") of the Operating Partnership. Class A-1 Units are redeemable by the holder for, at the election of the Issuer, shares of Class A Common Stock of the Issuer on a one-for-one basis or the cash value of such shares. Represents 123,766 Class A-1 Units previously reported as being owned by the Reporting Person. /s/ James R. Barry 2023-03-06