SEC Form 4 · Updated Daily
DAIO
— DATA I/O CORPORATION OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| LEVITICUS PARTNERS L P | 10%+ Owner | 1,020,312 | 2008-11-24 | P |
| Ambrose Anthony | Director · Officer | 471,048 | 2024-06-01 | A |
| Kanen Wealth Management LLC | 10%+ Owner | 398,803 | 2016-07-27 | — |
| Kanen David | 10%+ Owner | 398,803 | 2016-07-27 | — |
| HUME FREDERICK R | Director · Officer | 185,864 | 2012-07-31 | A |
| HATLEN JOEL S | Officer | 180,397 | 2023-06-01 | F |
| Gulati Rajeev | Officer | 167,897 | 2024-06-01 | A |
| Tidwell Michael R | Officer | 147,774 | 2024-06-01 | A |
| Brown Douglas Wells | Director | 101,759 | 2025-05-15 | A |
| DiBona Charles Joseph | Officer | 89,655 | 2026-09-01 | F |
| Washlow Sally A. | Director | 88,911 | 2026-07-08 | A |
| Ng Gerald Yat | Officer | 88,191 | 2024-07-03 | F |
| SMITH EDWARD J | Director | 79,375 | 2026-07-08 | A |
| GARY PAUL A | Director | 76,961 | 2010-10-19 | M |
| GALLENBERGER MARK J | Director | 69,509 | 2021-05-20 | A |
| Howe Alan B | Director | 65,832 | 2020-09-30 | A |
| Wentworth William O. | Director | 52,872 | 2025-12-02 | A |
| CROWLEY BRIAN | Director | 50,556 | 2018-05-21 | A |
| Larson Garrett Riley | Director | 46,832 | 2026-07-08 | A |
| WALKER WILLIAM R | Director | 34,200 | 2012-05-10 | A |
| DELAFIELD JOHN D | Director | 32,059 | 2020-09-30 | A |
| Weigelt Harald | Officer | 26,217 | 2008-04-23 | M |
| WASZAK STEVEN M | Director | 24,210 | 2026-07-08 | A |
| QUIST STEVEN M | Director | 21,876 | 2012-05-10 | A |
| Bluechel Gordon Blaire | Officer | 19,241 | 2013-05-24 | A |
| DILEO DANIEL A | Director | 18,516 | 2009-05-08 | M |
| Myer Kenneth Brian | Director | 17,400 | 2013-05-24 | A |
| LAZOWSKA EDWARD D | Director | 16,708 | 2007-11-27 | M |
| Bo-Linn Cheemin | Director | 15,401 | 2022-05-19 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-01 | DiBona Charles Joseph | Tax withholding | 10,345 | $2.88 | 89,655 |
| 2026-07-08 | WASZAK STEVEN M | Grant / award | 16,260 | $3.56 | 24,210 |
| 2026-07-08 | Washlow Sally A. | Grant / award | 16,260 | $3.56 | 88,911 |
| 2026-07-08 | SMITH EDWARD J | Grant / award | 16,260 | $3.56 | 79,375 |
| 2026-07-08 | Larson Garrett Riley | Grant / award | 16,260 | $3.56 | 46,832 |
| 2025-12-03 | WASZAK STEVEN M | Grant / award | 7,950 | $2.79 | 7,950 |
| 2025-12-03 | Wentworth William O. | Grant / award | 1,100 | $2.80 | 53,972 |
| 2025-12-02 | Wentworth William O. | Grant / award | 7,455 | $2.78 | 52,872 |
| 2025-09-01 | DiBona Charles Joseph | Grant / award | 100,000 | $3.15 | 100,000 |
| 2025-05-15 | Washlow Sally A. | Grant / award | 20,300 | $2.48 | 72,651 |
| 2025-05-15 | Brown Douglas Wells | Grant / award | 20,300 | $2.48 | 101,759 |
| 2025-05-15 | Larson Garrett Riley | Grant / award | 20,300 | $2.48 | 30,572 |
| 2025-05-15 | SMITH EDWARD J | Grant / award | 20,300 | $2.48 | 63,115 |
| 2025-05-07 | SMITH EDWARD J | Open-market buy | 5,000 | $2.46 | 42,815 |
| 2025-05-06 | Wentworth William O. | Open-market buy | 10,332 | $2.42 | 45,417 |
| 2025-05-02 | Wentworth William O. | Grant / award | 10,585 | $2.36 | 35,085 |
| 2025-05-01 | Wentworth William O. | Open-market buy | 10,585 | $2.36 | 35,085 |
| 2025-01-23 | Larson Garrett Riley | — | — | — | 5,000 |
| 2025-01-23 | Larson Garrett Riley | Grant / award | 5,272 | $2.91 | 5,272 |
| 2024-09-03 | Wentworth William O. | Grant / award (derivative) | 200,000 | $2.39 | 200,000 |
| 2024-08-26 | Brown Douglas Wells | Open-market buy | 3,000 | $2.66 | 81,459 |
| 2024-07-03 | Ng Gerald Yat | Tax withholding | 5,559 | $2.79 | 88,191 |
| 2024-06-01 | Ambrose Anthony | Grant / award | 37,500 | $2.87 | 471,048 |
| 2024-06-01 | Ambrose Anthony | Tax withholding | 8,870 | $2.87 | 433,548 |
| 2024-06-01 | Ambrose Anthony | Tax withholding | 9,978 | $2.87 | 442,418 |
| 2024-06-01 | Ambrose Anthony | Tax withholding | 6,652 | $2.87 | 452,396 |
| 2024-06-01 | Ng Gerald Yat | Grant / award | 18,750 | $2.87 | 93,750 |
| 2024-06-01 | Tidwell Michael R | Grant / award | 12,500 | $2.87 | 147,774 |
| 2024-06-01 | Tidwell Michael R | Tax withholding | 1,976 | $2.87 | 135,274 |
| 2024-06-01 | Tidwell Michael R | Tax withholding | 1,853 | $2.87 | 137,250 |
| 2024-06-01 | Tidwell Michael R | Tax withholding | 2,223 | $2.87 | 139,103 |
| 2024-06-01 | Gulati Rajeev | Grant / award | 12,500 | $2.87 | 167,897 |
| 2024-06-01 | Gulati Rajeev | Tax withholding | 1,976 | $2.87 | 155,397 |
| 2024-06-01 | Gulati Rajeev | Tax withholding | 1,853 | $2.87 | 157,373 |
| 2024-06-01 | Gulati Rajeev | Tax withholding | 1,482 | $2.87 | 159,226 |
| 2024-05-18 | Tidwell Michael R | Tax withholding | 2,965 | $2.91 | 141,326 |
| 2024-05-18 | Gulati Rajeev | Tax withholding | 2,223 | $2.91 | 160,708 |
| 2024-05-18 | Ambrose Anthony | Tax withholding | 9,978 | $2.91 | 459,058 |
| 2024-05-16 | Washlow Sally A. | Grant / award | 14,100 | $2.93 | 52,351 |
| 2024-05-16 | Brown Douglas Wells | Grant / award | 14,100 | $2.93 | 78,459 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.