X0508 4 2025-03-13 0 0001585389 SmartStop Self Storage REIT, Inc. N/A 0001462216 Schwartz H. Michael 10 TERRACE ROAD LADERA RANCH CA 92694 1 1 1 0 Chief Executive Officer 0 Class A Common Stock 483224 I See Footnote 1. Class A Common Stock 117260.79 I Through Schwartz Family Trust dated September 22, 2003 Class A Common Units 0 Class A Common Stock 116.45 116.45 I Through Schwartz Family Trust dated September 22, 2003 Class A Common Units 0 Class A Common Stock 386173 386173 I See Footnote 4. Long-Term Incentive Plan Units 0 2025-03-13 4 A 0 36039.46 0 A Class A Common Stock 36039.46 577924.76 I Through Schwartz Family Trust dated September 22, 2003 Long-Term Incentive Plan Units 0 2025-03-17 4 A 0 195392 0 A Class A Common Stock 195392 935165.16 I Through Schwartz Family Trust dated September 22, 2003 Long-Term Incentive Plan Units 0 2025-03-17 4 A 0 192476 0 A Class A Common Stock 192476 770400.76 I Through Schwartz Family Trust dated September 22, 2003 Class A-1 Units 0 Class A Common Stock 9590781.71 9590781.71 I See Footnote 11. Represents 483,224 shares of Class A Common Stock owned by SmartStop OP Holdings, LLC ("SOH") previously reported as being owned by the Reporting Person. SOH is indirectly owned and controlled by the Reporting Person. Represents 117,260.79 shares of Class A Common Stock previously reported as being owned by the Reporting Person. Represents Class A common units ("Class A Common Units") of SmartStop OP, L.P., the Issuer's operating partnership (the "Operating Partnership"). 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 386,173 Class A Common Units owned by SOH previously reported as being owned by the Reporting Person. Represents long-term incentive plan units ("LTIP Units") of the Operating Partnership. Vested LTIP Units are convertible into Class A Common Units. Represents LTIP Units previously reported as being owned by the Reporting Person, which LTIP Units were subject to vesting based on the achievement of specified performance measures. Such LTIP Units were reported at 200% of the target number of LTIP Units to be issued upon vesting, or 72,078.91 LTIP Units, on February 4, 2022. The actual number of LTIP Units to be issued upon vesting could range from 0% to 100% of the number of LTIP Units reported based on the actual performance measure achieved. On March 13, 2025, the Compensation Committee of the Issuer's Board of Directors determined that a performance measure had been achieved such that 50% of the number of LTIP Units previously reported, or 36,039.46 LTIP Units, were earned. Excludes 36,039.45 LTIP Units previously reported as being owned by the Reporting Person that did not vest, as described in Footnote 6. Represents 195,392 LTIP Units issued to the Reporting Person pursuant to the Issuer's incentive plan, which LTIP Units vest ratably over four years commencing on December 31, 2025, subject to the Reporting Person's continued employment or service through each vesting date. Represents 192,476 LTIP Units issued to the Reporting Person pursuant to the Issuer's incentive plan, 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. Assuming the achievement of the specified performance measures, the LTIP Units, as adjusted, will vest no later than March 31, 2028. 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 9,590,781.71 Class A-1 Units owned by SOH previously reported as being owned by the Reporting Person. /s/ H. Michael Schwartz 2025-03-17