# EDGAR Filing Document

**Accession Number:** 0001175535
**File Stem:** 0001437749-26-011786
**Filing Date:** 2026-4
**Character Count:** 3384
**Document Hash:** d58ff2929796e3c3268414386a78158a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001437749-26-011786.hdr.sgml**: 20260408

**ACCESSION NUMBER**: 0001437749-26-011786

**CONFORMED SUBMISSION TYPE**: DFAN14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260408

**DATE AS OF CHANGE**: 20260408

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Whitestone REIT
- **CENTRAL INDEX KEY:** 0001175535
- **STANDARD INDUSTRIAL CLASSIFICATION:** REAL ESTATE INVESTMENT TRUSTS [6798]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 760594970
- **STATE OF INCORPORATION:** TX
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DFAN14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34855
- **FILM NUMBER:** 26848791

**BUSINESS ADDRESS:**
- **STREET 1:** 2600 SOUTH GESSNER
- **STREET 2:** SUITE 500
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77063
- **BUSINESS PHONE:** 713-827-9595

**MAIL ADDRESS:**
- **STREET 1:** 2600 SOUTH GESSNER
- **STREET 2:** SUITE 500
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77063

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** HARTMAN COMMERCIAL PROPERTIES REIT
- **DATE OF NAME CHANGE:** 20020613
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MASTANDREA JAMES C
- **CENTRAL INDEX KEY:** 0001225704

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** DFAN14A

**MAIL ADDRESS:**
- **STREET 1:** 1240 HURON ROAD SUITE 301
- **CITY:** CLEVELAND
- **STATE:** OH
- **ZIP:** 44115

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**SCHEDULE 14A**

**(Rule 14a-101)**

**INFORMATION REQUIRED IN PROXY STATEMENT**

**SCHEDULE 14A INFORMATION**

**Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934**

**(Amendment No.)**

Filed by the Registrant ☐

Filed by a Party other than the Registrant ☒

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ Definitive Additional Materials

☐ Soliciting Material Under Rule 14a-12

<u>WHITESTONE REIT</u>

(Name of Registrant as Specified In Its Charter)

JAMES C. MASTANDREA

PILLARSTONE CAPITAL REIT

CHAD D. CHAMPION

DENNIS H. CHOOKASZIAN

JERRY L. FALWELL, JR.

JOHN A. GOOD

KATHY M. JASSEM

STEWART MORRIS, JR.

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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James C. Mastandrea, together with the other participants named herein, has filed a definitive proxy statement and accompanying GOLD proxy card with the Securities and Exchange Commission to be used to solicit votes for the election of his slate of highly-qualified trustee nominees at the 2026 Annual Meeting of Shareholders of Whitestone REIT, a Maryland real estate investment trust.

On April 8, 2026, Mr. Mastandrea posted materials to <u>www.okapivote.com/WSR</u>, copies of which are attached hereto in [Exhibit 99.1](ex_943391.htm) and incorporated herein by reference.

## Exhibit 99.1

**Exhibit 99.1**

**WEBSITE UPDATES**

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