X0609 4 2026-03-25 0 0001585389 SmartStop Self Storage REIT, Inc. SMA 0001462216 Schwartz H. Michael false 10 TERRACE ROAD LADERA RANCH CA 92694 1 1 0 0 CEO and President 0 Common Stock 24250 I See Footnote 1. Common Stock 120805 I See Footnote 2. Common Stock 29315 I Through Schwartz Family Trust dated September 22, 2003 Long-Term Incentive Plan Units 0 2026-03-25 4 A 0 64775 0 A Common Stock 64775 298566.29 I Through Schwartz Family Trust dated September 22, 2003 Long-Term Incentive Plan Units 0 2026-03-25 4 A 0 103342 0 A Common Stock 103342 295942.19 I Through Schwartz Family Trust dated September 22, 2003 Common Units 0 Common Stock 29.11 29.11 I Through Schwartz Family Trust dated September 22, 2003 Common Units 0 Common Stock 96543.26 96543.26 I See Footnote 9. Class A-1 Units 0 Common Stock 2397695.44 2397695.44 I See Footnote 11. Represents 24,250 shares of common stock previously reported as being indirectly owned by the Reporting Person through Churchill TRI LLC, a Nevada limited liability company, which is 50% owned by The H. Michael Schwartz 2011 Irrevocable Trust and 50% owned by The Holly Breaux Schwartz 2011 Irrevocable Trust. Represents 120,805 shares of 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 29,315 shares of Common 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 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 64,775 LTIP Units granted to the Reporting Person pursuant to the Issuer's incentive plan, which LTIP Units vest ratably over four years commencing on December 31 of the year of grant, subject to the Reporting Person's continued employment or service through each vesting date. Represents 103,342 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 January 31, 2029. Represents common units ("Common Units") of the Operating Partnership. Common 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 29.11 Common Units previously reported as being owned by the Reporting Person. Represents 96,543.26 Common Units owned by SOH previously reported as being owned by the Reporting Person. 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 Common Stock of the Issuer on a one-for-one basis or the cash value of such shares. Represents 2,397,695.44 Class A-1 Units owned by SOH previously reported as being owned by the Reporting Person. /s/ H. Michael Schwartz 2026-03-27