Based on data from the past 90 days ending February 19, 2026, Whitestone REIT's three largest insider shareholders are President And Coo Christine J Mastandrea (1.74Mn shares), Director James C Mastandrea (1.57Mn shares), Chief Executive Officer David K Holeman (807.36K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Christine J Mastandrea | President And Coo | 1,738,084 | 06 Jan, 2026 |
| James C Mastandrea | 1,571,127 | 20 Jan, 2022 | |
| David K Holeman | Chief Executive Officer | 807,362 | 06 Jan, 2026 |
| Bradford D Johnson | Evp Acquisitions & Asset Mgmt | 293,309 | 01 Jul, 2021 |
| John J Dee | Coo & Secretary | 251,298 | 02 Aug, 2021 |
| John Scott Hogan | Chief Financial Officer | 228,170 | 06 Jan, 2026 |
| Peter Tropoli | General Counsel & Secretary | 170,335 | 06 Jan, 2026 |
| Soklin Siv | Vp Of Human Resources | 98,744 | 06 Jan, 2026 |
| Paul T Lambert | 82,090 | 20 Dec, 2022 | |
| Amy Shih-Hua Feng | 69,507 | 29 Dec, 2025 | |
| Jack L Mahaffey | 63,584 | 15 Dec, 2021 | |
| Jeffrey Alan Jones | 39,478 | 29 Dec, 2025 | |
| Nandita Berry | 36,129 | 21 Dec, 2023 | |
| David F. Taylor | 34,536 | 21 Dec, 2023 | |
| Donald A Miller | 33,694 | 29 Dec, 2025 | |
| Julia Bruns Buthman | 31,577 | 29 Dec, 2025 | |
| Kristian M Gathright | 15,789 | 29 Dec, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 02 Jan, 2026 | Peter Tropoli | Common Shares | D | 15,455 | $13.89 | 170,335 | D | F |
| 02 Jan, 2026 | Peter Tropoli | Common Shares | A | 38,314 | $0.00 | 185,790 | D | A |
| 02 Jan, 2026 | David K Holeman | Common Shares | D | 35,081 | $13.89 | 807,362 | D | F |
| 02 Jan, 2026 | David K Holeman | Common Shares | A | 87,576 | $0.00 | 842,443 | D | A |
| 02 Jan, 2026 | Christine J Mastandrea | Common Shares | A | 51,998 | $0.00 | 462,929 | D | A |
| 02 Jan, 2026 | John Scott Hogan | Common Shares | A | 38,314 | $0.00 | 243,699 | D | A |
| 02 Jan, 2026 | John Scott Hogan | Common Shares | D | 15,529 | $13.89 | 228,170 | D | F |
| 02 Jan, 2026 | Soklin Siv | Common Shares | D | 6,521 | $13.89 | 98,744 | D | F |
| 02 Jan, 2026 | Soklin Siv | Common Shares | A | 24,084 | $0.00 | 105,265 | D | A |
| 24 Dec, 2025 | Kristian M Gathright | Common Shares | A | 12,286 | $13.70 | 15,789 | D | A |
| 24 Dec, 2025 | Donald A Miller | - | - | 33,694 | D | |||
| 24 Dec, 2025 | Donald A Miller | Common Shares | A | 11,986 | $13.70 | 33,694 | D | A |
| 24 Dec, 2025 | Jeffrey Alan Jones | Common Shares | A | 6,368 | $13.70 | 39,478 | D | A |
| 24 Dec, 2025 | Amy Shih-Hua Feng | Common Shares | A | 15,282 | $13.70 | 69,507 | D | A |
| 24 Dec, 2025 | Julia Bruns Buthman | Common Shares | A | 12,660 | $13.70 | 31,577 | D | A |
| 30 Jun, 2025 | Peter Tropoli | Common Shares | D | 6,042 | $12.48 | 147,476 | D | F |
| 30 Jun, 2025 | Peter Tropoli | Common Shares | A | 16,768 | $0.00 | 153,518 | D | A |
| 30 Jun, 2025 | David K Holeman | Common Shares | D | 12,865 | $12.48 | 754,867 | D | F |
| 30 Jun, 2025 | David K Holeman | Common Shares | A | 30,201 | $0.00 | 767,732 | D | A |
| 30 Jun, 2025 | Christine J Mastandrea | Common Shares | A | 23,323 | $0.00 | 417,401 | D | A |