The sale was executed under a Rule 10b5-1 plan adopted in December 2025, while Mueller retains thousands of incentive units tied to his board service.

March 18, 2026

SmartStop Self Storage REIT Inc. (SMA) director David J. Mueller sold 425 shares of common stock on March 16, 2026, at a price of $32.81 per share, according to a statement of changes in beneficial ownership filed with the U.S. Securities and Exchange Commission.

The transaction, totaling approximately $13,944, was carried out under a prearranged Rule 10b5-1 trading plan that Mueller adopted on December 15, 2025. Such plans allow company insiders to set up predetermined trading schedules, providing an affirmative defense against allegations of insider trading by ensuring that buy or sell decisions are made at a time when the insider does not possess material nonpublic information.

Remaining Holdings

Following the sale, Mueller holds 6,765.87 shares of SmartStop common stock directly. In addition, he maintains two tranches of long-term incentive plan units, or LTIP Units, issued through SmartStop OP, L.P., the company’s operating partnership.

The first tranche consists of 7,234.25 LTIP Units granted in connection with Mueller’s reelection to the board of directors. These units vest one year from each reelection date. The second tranche totals 9,598 LTIP Units, which vest ratably over a four-year period beginning on the first anniversary of issuance, contingent on Mueller’s continued service on the board.

About LTIP Units

Once vested, LTIP Units are convertible into common units of the operating partnership, which in turn can be redeemed by the holder. At the company’s election, redemption may take the form of shares of SmartStop common stock on a one-for-one basis or the equivalent cash value of those shares.

Mueller, who lists his address as Ladera Ranch, California, serves as a director of the Ladera Ranch, California-based self-storage REIT. The filing did not indicate any change to his role with the company.