Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Look Nicholas 2. Issuer Name and Ticker or Trading Symbol SmartStop Self Storage REIT, Inc. [SMA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) General Counsel and Secretary (Last) (First) (Middle) 10 TERRACE ROAD 3. Date of Earliest Transaction (Month/Day/Year) 11/14/2025 (Street) LADERA RANCH, CA 92694 4. If Amendment, Date Original Filed (Month/Day/Year) 6. Individual or Joint/Group Filing (Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 11/14/2025 S 458 D $32.85 1,613(1) D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Long-Term Incentive Plan Units(2)

$ 0 (2)

(3)

(3)

Common Stock

29,319

29,319(3)

D

Long-Term Incentive Plan Units(2)

$ 0 (2)

(4)

(4)

Common Stock

11,820.99

11,820.99(4)

D

Long-Term Incentive Plan Units(2)

$ 0 (2)

(5)

(5)

Common Stock

9,515.65

9,515.65(5)

D

Class A-1 Units(6)

$ 0 (6)

(6)

(6)

Common Stock

12,376.50

12,376.50(7)

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Look Nicholas 10 TERRACE ROAD LADERA RANCH, CA 92694			General Counsel and Secretary

Signatures

/s/ Nicholas Look		11/14/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	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.
(2)	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.
(3)	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.
(4)	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.
(5)	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.
(6)	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.
(7)	Represents 12,376.50 Class A-1 Units previously reported as being owned by the Reporting Person.

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