Data I/O
Provides programming and security-deployment systems for electronics manufacturing.
$2.96
After-hours close−0.01 (−0.34%)
At close$2.97(−0.34%)
Something off on this page? Send us feedback.
Breakdown13F · Form 4
Institutions 27.96%2.87M sharesInsiders 4.82%495.1K sharesOther 67.22%6.90M shares
Shares outstanding 10.26M · Float 7.85M · 76.5% free float
Institutions13F, as of Mar 31, 2026
30 holders · 2.87M shares · 7 new positions · 9 increased · 7 reduced · 4 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Kanen Wealth Management LLC | 839.4K | 8.18% | 0 | May 18, 2026 |
| Renaissance Technologies LLC | 407.6K | 3.97% | −30.0K | May 14, 2026 |
| Penbrook Management LLC | 356.9K | 3.48% | 0 | Apr 21, 2026 |
| Vanguard Capital Management LLC | 299.4K | 2.92% | +299.4Knew | May 15, 2026 |
| Kovack Advisors, Inc. | 268.0K | 2.61% | −925 | May 13, 2026 |
| Dimensional Fund Advisors LP | 140.7K | 1.37% | −39.6K | May 7, 2026 |
| Acadian Asset Management LLC | 124.1K | 1.21% | −1.1K | May 13, 2026 |
| Geode Capital Management, LLC | 86.9K | 0.85% | −17.7K | May 15, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Lytton Laurence W | 9.90% | 1.03M | 13G | Jun 23, 2026 ↗ |
| Philotimo Fund, LP | 5.30% | 487.1K | 13G | May 22, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Douglas Wells Brown | director | 101.8K | 0.99% | May 19, 2025 |
| Charles Joseph DiBona | officer: Vice President & CFO | 100.0K | 0.97% | Sep 30, 2025 |
| Sally A. Washlow | director | 88.9K | 0.87% | Jul 10, 2026 |
| Edward J. Smith | director | 79.4K | 0.77% | Jul 10, 2026 |
| William O. Wentworth | director, officer: President | 54.0K | 0.53% | Dec 5, 2025 |
| Garrett Riley Larson | director | 46.8K | 0.46% | Jul 10, 2026 |
| Steven M. Waszak | director | 24.2K | 0.24% | Jul 10, 2026 |
2 ten-percent owners hold 1.42M shares by Form 4, outside the officers-and-directors figure above · 19 people have not refiled in the last 18 months (1.63M shares), so they are not in the figure above
Latest trades
No open-market trades in the last 12 months.
CongressHouse and Senate disclosures
Not reported.