SmartStop director Mueller proposes $14.4K share sale

The shares to be sold are attributed to compensation from restricted stock vesting on September 16, 2020, and the notice lists three earlier 425-share sales.

Rhea-AI Filing Summary

David J. Mueller, a director of SmartStop Self Storage REIT, Inc. (SMA), reported a proposed sale of 425 common shares, with an aggregate market value of $14,441.50 and an approximate sale date of October 16, 2026. Fidelity Brokerage Services LLC is listed as the broker, and NYSE is listed as the exchange.

The shares are identified as compensation from restricted stock vesting on September 16, 2020. The notice also lists three prior sales, each of 425 shares: $14,186.50 in gross proceeds on July 16, $14,322.50 on August 17, and $13,621.25 on September 16, 2026.

Key Figures

Proposed shares for sale: 425 shares Aggregate market value: $14,441.50 Shares sold: 425 shares +5 more

8 metrics

Proposed shares for sale 425 shares Approximate sale date October 16, 2026

Aggregate market value $14,441.50 Proposed sale

Shares sold 425 shares July 16, 2026

Gross proceeds $14,186.50 Sale on July 16, 2026

Shares sold 425 shares August 17, 2026

Gross proceeds $14,322.50 Sale on August 17, 2026

Shares sold 425 shares September 16, 2026

Gross proceeds $13,621.25 Sale on September 16, 2026

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact

3 terms

Rule 144 regulatory

"sales required by paragraph (e) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Restricted Stock Vesting"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for David J. Mueller"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many SMA shares did David J. Mueller propose to sell, and what was their value?

David J. Mueller, a director of SmartStop Self Storage REIT, Inc. (SMA), reported a proposed sale of 425 common shares with an aggregate market value of $14,441.50. The approximate sale date is October 16, 2026, and Fidelity Brokerage Services LLC is listed as the broker.

What prior sales did David J. Mueller report for SMA?

The reported prior sales were 425 common shares on July 16, 2026, for $14,186.50 in gross proceeds; 425 shares on August 17, 2026, for $14,322.50; and 425 shares on September 16, 2026, for $13,621.25.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/16/2026 - 09:43 AM EDT Accepted by SEC EDGAR 10/16/2026 - 09:42 AM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001672825
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	SmartStop Self Storage REIT, Inc.
SEC File Number	001-42584
Address of Issuer	10 TERRACE ROAD LADERA RANCH CALIFORNIA 92694
Phone	949 429 6600
Name of Person for Whose Account the Securities are To Be Sold	Mueller David J
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	425	14441.50	55368903	10/16/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/16/2020	Restricted Stock Vesting	Issuer			425	09/16/2020	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
David J. Mueller 10 Terrace Rd. Ladera Ranch CA 92694	Common	07/16/2026	425	14186.50
David J. Mueller 10 Terrace Rd Ladera Ranch CA 92694	Common	08/17/2026	425	14322.50
David J. Mueller 10 Terrace Rd Ladera Ranch CA 92694	Common	09/16/2026	425	13621.25

144: Remarks and Signature

Remarks
Date of Notice	10/16/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	12/15/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David J. Mueller
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)