Quick Takeaways
- DAIO - DATA I/O CORP has 14 insiders with reported activity on this page.
- No net insider buy/sell flow is currently reported for the last year.
- Recent transaction rows are available for direct filing-level review.
Insider Transactions Reported by 14 Insiders of DATA I/O CORP
- Symbol
- DAIO on Nasdaq
- Location
- Redmond, WA
What Changed
- No meaningful buy/sell imbalance is currently visible in the one-year window.
- Activity will update as new Forms 3/4/5 are filed.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsInsider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 16 May 2025.
Buys
$0
Shares: 0
Insiders: 0
Sells
$0
Shares: 0
Insiders: 0
Net
$0
Shares: 0
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
DATA I/O CORP executives and other stock owners filed with the SEC include:
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Anthony Ambrose | President, Director | $1,351,908 | Mixed | 01 Jun 2024 | ||
| Joel S. Hatlen | Vice President CFO COO | $774,818 | Mixed | 01 Jun 2023 | ||
| Rajeev Gulati | Vice President CTO | $481,864 | Mixed | 01 Jun 2024 | ||
| Michael R. Tidwell | VP Mktg & Corp Bus Dev | $424,111 | Mixed | 01 Jun 2024 | ||
| Charles Joesph DiBona | Vice President & CFO | $315,430 | Mixed | 01 Sep 2025 | ||
| Mark J. Gallenberger | Director | $302,364 | Mixed | 20 May 2021 | ||
| Douglas Wells Brown | Director | $252,362 | Mixed | 15 May 2025 | ||
| Gerald Yat Ng | Vice President CFO | $246,053 | Mixed | 03 Jul 2024 | ||
| Sally A. Washlow | Director | $180,174 | Mixed | 15 May 2025 | ||
| Edward J. Smith | Director | $156,525 | Mixed | 15 May 2025 | ||
| Wentworth William O | President, Director | $147,195 | Mixed | 03 Dec 2025 | ||
| Garrett Riley Larson | Director | $75,818 | Mixed | 15 May 2025 | ||
| Cheemin Bo-Linn | Director | $66,994 | Mixed | 19 May 2022 | ||
| Steven M. Waszak | Director | $22,192 | Mixed | 03 Dec 2025 |
Top shareholders of DATA I/O CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Philotimo Fund, LP |
13D/G
|
Kanen David |
9.1%
|
839,421
|
$1,939,063 | $0 | 22 May 2025 | |
| Anthony Ambrose |
3/4/5
|
President, Director |
—
class O/S missing
|
471,048
|
$1,351,908 | — | 01 Jun 2024 | |
| RENAISSANCE TECHNOLOGIES LLC |
13D/G
13F
|
Company |
4.7%
|
437,637
|
$1,321,664 | $0 | 31 Dec 2025 | |
| Penbrook Management LLC |
13F
|
Company |
3.8%
|
356,850
|
$902,830 | — | 31 Mar 2026 | |
| Joel S. Hatlen |
3/4/5
|
Vice President CFO COO |
—
class O/S missing
|
178,119
|
$774,818 | — | 01 Jun 2023 | |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
|
Company |
3.2%
|
299,397
|
$757,474 | — | 31 Mar 2026 | |
| Kovack Advisors, Inc. |
13F
|
Company |
2.9%
|
267,981
|
$635,115 | — | 31 Mar 2026 | |
| Rajeev Gulati |
3/4/5
|
Vice President CTO |
—
class O/S missing
|
167,897
|
$481,864 | — | 01 Jun 2024 | |
| Michael R. Tidwell |
3/4/5
|
VP Mktg & Corp Bus Dev |
—
class O/S missing
|
147,774
|
$424,111 | — | 01 Jun 2024 | |
| DIMENSIONAL FUND ADVISORS LP |
13F
|
Company |
1.5%
|
140,679
|
$355,918 | — | 31 Mar 2026 | |
| Charles Joesph DiBona |
3/4/5
|
Vice President & CFO |
1.1%
|
100,000
|
$315,430 | — | 01 Sep 2025 | |
| ACADIAN ASSET MANAGEMENT LLC |
13F
|
Company |
1.3%
|
124,119
|
$313,000 | — | 31 Mar 2026 | |
| Mark J. Gallenberger |
3/4/5
|
Director |
—
class O/S missing
|
69,509
|
$302,364 | — | 20 May 2021 | |
| Douglas Wells Brown |
3/4/5
|
Director |
1.1%
|
101,759
|
$252,362 | — | 15 May 2025 | |
| Gerald Yat Ng |
3/4/5
|
Vice President CFO |
—
class O/S missing
|
88,191
|
$246,053 | — | 03 Jul 2024 | |
| GEODE CAPITAL MANAGEMENT, LLC |
13F
|
Company |
0.92%
|
86,867
|
$219,831 | — | 31 Mar 2026 | |
| ESSEX INVESTMENT MANAGEMENT CO LLC |
13F
|
Company |
0.79%
|
74,641
|
$188,842 | — | 31 Mar 2026 | |
| Sally A. Washlow |
3/4/5
|
Director |
0.77%
|
72,651
|
$180,174 | — | 15 May 2025 | |
| Edward J. Smith |
3/4/5
|
Director |
0.67%
|
63,115
|
$156,525 | — | 15 May 2025 | |
| Wentworth William O |
3/4/5
|
President, Director |
0.56%
|
52,872
|
$147,195 | — | 03 Dec 2025 | |
| VANGUARD FIDUCIARY TRUST CO |
13F
|
Company |
0.49%
|
45,853
|
$116,008 | — | 31 Mar 2026 | |
| Steward Partners Investment Advisory, LLC |
13F
|
Company |
0.46%
|
43,472
|
$109,984 | — | 31 Mar 2026 | |
| Garrett Riley Larson |
3/4/5
|
Director |
0.33%
|
30,572
|
$75,818 | — | 15 May 2025 | |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP |
13F
|
Company |
0.29%
|
26,837
|
$67,897 | — | 31 Mar 2026 | |
| Cheemin Bo-Linn |
3/4/5
|
Director |
—
class O/S missing
|
15,401
|
$66,994 | — | 19 May 2022 | |
| LPL Financial LLC |
13F
|
Company |
0.24%
|
22,545
|
$57,039 | — | 31 Mar 2026 | |
| JAMES INVESTMENT RESEARCH, INC. |
13F
|
Company |
0.24%
|
22,402
|
$56,677 | — | 31 Mar 2026 | |
| Legato Capital Management LLC |
13F
|
Company |
0.19%
|
17,550
|
$44,401 | — | 31 Mar 2026 | |
| BlackRock, Inc. |
13F
|
Company |
0.18%
|
17,015
|
$43,048 | — | 31 Mar 2026 | |
| STATE STREET CORP |
13F
|
Company |
0.17%
|
16,170
|
$40,910 | — | 31 Mar 2026 | |
| GOLDMAN SACHS GROUP INC |
13F
|
Company |
0.15%
|
13,788
|
$34,884 | — | 31 Mar 2026 | |
| NORTHERN TRUST CORP |
13F
|
Company |
0.14%
|
13,476
|
$34,094 | — | 31 Mar 2026 | |
| Steven M. Waszak |
3/4/5
|
Director |
0.08%
|
7,950
|
$22,192 | — | 03 Dec 2025 | |
| Vanguard Global Advisers, LLC |
13F
|
Company |
0.05%
|
5,124
|
$12,964 | — | 31 Mar 2026 | |
| SIMPLEX TRADING, LLC |
13F
|
Company |
0.03%
|
2,759
|
$6,980 | — | 31 Mar 2026 | |
| Tower Research Capital LLC (TRC) |
13F
|
Company |
0.02%
|
1,681
|
$4,253 | — | 31 Mar 2026 | |
| UBS Group AG |
13F
|
Company |
0.01%
|
941
|
$2,381 | — | 31 Mar 2026 | |
| BARD ASSOCIATES INC |
13F
|
Company |
0%
|
100
|
$253 | — | 31 Mar 2026 | |
| GROUP ONE TRADING LLC |
13F
|
Company |
0%
|
100
|
$253 | — | 31 Mar 2026 | |
| HUNTINGTON NATIONAL BANK |
13F
|
Company |
0%
|
1
|
$3 | — | 31 Mar 2026 | |
| SBI Securities Co., Ltd. |
13F
|
Company |
0%
|
1
|
$3 | — | 31 Mar 2026 |
Recent Insider Transactions by Companies or Individuals for DATA I/O CORP
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Wentworth William O | DAIO | Common Stock | Award | 2.08% | 1,100 | 53,972 | 03 Dec 2025 | Direct | ||
| Steven M. Waszak | DAIO | Common Stock | Award | 7,950 | 7,950 | 03 Dec 2025 | Direct | |||
| Wentworth William O | DAIO | Common Stock | Award | 16.4% | 7,455 | 52,872 | 02 Dec 2025 | Direct | ||
| Charles Joesph DiBona | DAIO | Common Stock | Award | 100,000 | 100,000 | 01 Sep 2025 | Direct |
* An asterisk sign (*) next to the price indicates that the price is likely invalid.