X0508 4 2025-11-14 0 0001585389 SmartStop Self Storage REIT, Inc. SMA 0001781345 Look Nicholas 10 TERRACE ROAD LADERA RANCH CA 92694 0 1 0 0 General Counsel and Secretary 0 Common Stock 2025-11-14 4 S 0 458 32.85 D 1613 D Long-Term Incentive Plan Units 0 Common Stock 29319 29319 D Long-Term Incentive Plan Units 0 Common Stock 11820.99 11820.99 D Long-Term Incentive Plan Units 0 Common Stock 9515.65 9515.65 D Class A-1 Units 0 Common Stock 12376.5 12376.5 D Includes shares of Common Stock previously reported as being owned by the Reporting Person, less .34 shares of Common Stock that were redeemed by the Issuer in connection with a fractional share redemption conducted by the Issuer with respect to its outstanding Common Stock as of July 30, 2025. 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 common units of the Operating Partnership ("Common Units"). Common Units are redeemable by the holder for, at the election of the Issuer, shares of the Issuer's Common Stock on a one-for-one basis or the cash value of such shares. Represents 29,319 LTIP Units issued to the Reporting Person pursuant to the Issuer's incentive plan, which LTIP Units vest ratably over four years commencing on the first anniversary of the issuance thereof, subject to the Reporting Person's continued employment or service through each vesting date. Represents 11,820.99 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 9,515.65 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-I Units are redeemable by the holder for, at the election of the Issuer, shares of Common Stock of the Issuer on a one-for-one basis or the cash value of such shares. Represents 12,376.50 Class A-1 Units previously reported as being owned by the Reporting Person. /s/ Nicholas Look 2025-11-14