WSR Whitestone REIT

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES                                                                                   
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940                       

1. Name and Address of Reporting Person * Mastandrea Christine J	2. Issuer Name and Ticker or Trading Symbol Whitestone REIT [ WSR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director                    _____ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) EVP CORPORATE STRATEGY
(Last)          (First)          (Middle) 2600 SOUTH GESSNER, SUITE 500	3. Date of Earliest Transaction (MM/DD/YYYY) 7/31/2021
(Street) HOUSTON, TX 77063 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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 Shares	7/31/2021		F		1522 (1)	D	$8.85 (2)	293572	D
Common Shares								1526512 (3)	I	By Spouse
Common Shares								126431	I	By L.P. (4)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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

Explanation of Responses:
(1)	Represents common shares withheld by the Company to satisfy tax withholding obligations in connection with the vesting of certain restricted units previously granted pursuant to the Company's 2018 Long-Term Equity Incentive Ownership Plan.
(2)	Per Share value assigned by the Company to the tax withholding shares based on the closing sales price of the common shares on July 30, 2021.
(3)	The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
(4)	Represents common shares held by Midwest Development Venture IV, an Illinois limited partnership ("Midwest"). Ms. Mastandrea's spouse, James Mastandrea, owns both a limited partner interest in Midwest and 100% of the equity of the general partner of Midwest. As a result, Ms. Mastandrea may be deemed to be the beneficial owner of the common shares held by Midwest. The reporting person disclaims beneficial ownership in these shares except to the extent of her pecuniary interest therein, and the inclusion of these common shares in this report shall not be deemed an admission of beneficial ownership of all of the reported common shares for purposes of Section 16 or for any other purpose.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mastandrea Christine J 2600 SOUTH GESSNER, SUITE 500 HOUSTON, TX 77063			EVP CORPORATE STRATEGY

Signatures
/s/ David K. Holeman, Attorney-in-Fact for Christine J. Mastandrea		8/2/2021
**Signature of Reporting Person		Date