DATA I O CORP (DAIO)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
Institutions report 3,210,633 shares against 10,395,627 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Kanen Wealth Management LLC | $3.3M | 839,421 | 0.80% | 21q | HELD |
| RENAISSANCE TECHNOLOGIES LLC | $1.5M | 392,443 | 0.00% | 31q | -3.7%-$59.9K |
| Penbrook Management LLC | $1.4M | 355,850 | 0.89% | 31q | HELD |
| VANGUARD CAPITAL MANAGEMENT LLC | $1.3M | 323,672 | 0.00% | 2q | +8.1%+$95.6K |
| Kovack Advisors, Inc. | $1.1M | 285,481 | 0.05% | 23q | +6.5%+$67.9K |
| CITADEL ADVISORS LLC | $684.5K | 173,738 | 0.00% | 15q | HELD |
| DIMENSIONAL FUND ADVISORS LP | $554.3K | 140,679 | 0.00% | 31q | HELD |
| GEODE CAPITAL MANAGEMENT, LLC | $453.4K | 115,057 | 0.00% | 31q | +32.5%+$111.1K |
| ACADIAN ASSET MANAGEMENT LLC | $427.0K | 108,582 | 0.00% | 31q | -12.5%-$61.1K |
| ESSEX INVESTMENT MANAGEMENT CO LLC | $293.8K | 74,558 | 0.04% | 14q | HELD |
| VANGUARD FIDUCIARY TRUST CO | $231.1K | 58,643 | 0.00% | 2q | +27.9%+$50.4K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $191.3K | 48,548 | 0.00% | 5q | +80.9%+$85.5K |
| Steward Partners Investment Advisory, LLC | $171.3K | 43,472 | 0.00% | 5q | HELD |
| STATE STREET CORP | $127.4K | 32,340 | 0.00% | 15q | +100.0%+$63.7K |
| THOMPSON DAVIS & CO., INC. | $92.7K | 23,533 | 0.06% | new | NEW |
| JAMES INVESTMENT RESEARCH, INC. | $88.3K | 22,402 | 0.01% | 31q | HELD |
| NewEdge Advisors, LLC | $88.3K | 22,402 | 0.00% | 28q | HELD |
| NORTHERN TRUST CORP | $86.0K | 21,827 | 0.00% | 31q | +62.0%+$32.9K |
| LPL Financial LLC | $82.7K | 21,000 | 0.00% | 2q | -6.9%-$6.1K |
| GROUP ONE TRADING LLC | $79.0K | 6,450 | 0.00% | 4q | +6350.0%+$77.8K |
| JANE STREET GROUP, LLC | $69.8K | 17,727 | 0.00% | new | NEW |
| Legato Capital Management LLC | $69.1K | 17,550 | 0.01% | 7q | HELD |
| BlackRock, Inc. | $67.0K | 17,015 | 0.00% | 8q | HELD |
| XTX Topco Ltd | $60.2K | 15,284 | 0.00% | new | NEW |
| SIMPLEX TRADING, LLC | $55.1K | 4,279 | 0.00% | new | NEW |
| HRT FINANCIAL LP | $44.0K | 11,288 | 0.00% | new | NEW |
| CITIGROUP INC | $28.3K | 7,176 | 0.00% | new | NEW |
| Vanguard Global Advisers, LLC | $20.2K | 5,124 | 0.00% | 2q | HELD |
| UBS Group AG | $16.6K | 4,222 | 0.00% | 2q | +348.7%+$12.9K |
| Point Nemo Capital, LLC | $2.0K | 500 | 0.00% | new | NEW |
| Tower Research Capital LLC (TRC) | $1.2K | 314 | 0.00% | 20q | -81.3%-$5.4K |
| BARCLAYS PLC | $197 | 50 | 0.00% | new | NEW |
| Caitong International Asset Management Co., Ltd | $16 | 4 | 0.00% | new | NEW |
| HUNTINGTON NATIONAL BANK | $4 | 1 | 0.00% | 15q | HELD |
| SBI Securities Co., Ltd. | $4 | 1 | 0.00% | 7q | HELD |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 35 | $12.7M | 3,210,633 | 9 | 10 | 4 | 0.7% |
| Q1 2026 | 28 | $7.4M | 2,847,413 | 4 | 2 | 6 | 3.7% |
| Q4 2025 | 27 | $9.7M | 2,955,087 | 3 | 7 | 7 | 12.9% |
| Q3 2025 | 26 | $10.9M | 3,191,255 | 2 | 4 | 7 | 2.4% |
| Q2 2025 | 26 | $10.6M | 3,484,133 | 3 | 10 | 5 | 0.0% |
| Q1 2025 | 26 | $7.5M | 3,065,390 | 1 | 6 | 4 | 0.3% |
| Q4 2024 | 30 | $8.7M | 3,137,498 | 4 | 2 | 6 | 0.3% |
| Q3 2024 | 29 | $8.1M | 3,165,704 | 2 | 5 | 6 | 0.0% |
| Q2 2024 | 31 | $9.1M | 3,283,518 | 3 | 5 | 9 | 0.2% |
| Q1 2024 | 31 | $11.8M | 3,355,685 | 3 | 11 | 9 | 0.0% |
| Q4 2023 | 30 | $8.4M | 2,854,806 | 3 | 8 | 9 | 0.3% |
| Q3 2023 | 29 | $12.9M | 3,383,504 | 2 | 6 | 12 | 0.1% |
| Q2 2023 | 29 | $14.5M | 3,375,212 | 1 | 9 | 4 | 0.0% |
| Q1 2023 | 30 | $16.4M | 3,287,639 | 1 | 5 | 9 | 0.1% |
| Q4 2022 | 30 | $11.1M | 2,783,145 | 9 | 6 | 5 | 0.1% |
| Q3 2022 | 24 | $8.9M | 3,204,718 | 0 | 6 | 9 | 0.0% |
| Q2 2022 | 24 | $10.3M | 3,357,503 | 0 | 8 | 6 | 0.0% |
| Q1 2022 | 25 | $14.0M | 3,306,975 | 0 | 3 | 12 | 0.0% |
| Q4 2021 | 28 | $15.0M | 3,216,116 | 0 | 11 | 8 | 1.2% |
| Q3 2021 | 33 | $23.7M | 3,582,738 | 5 | 7 | 8 | 1.4% |
| Q2 2021 | 28 | $24.7M | 3,624,388 | 4 | 11 | 8 | 0.0% |
| Q1 2021 | 27 | $18.6M | 3,423,528 | 3 | 10 | 8 | 0.0% |
| Q4 2020 | 26 | $13.7M | 3,328,215 | 4 | 2 | 7 | 0.0% |
| Q3 2020 | 22 | $10.9M | 3,419,131 | 0 | 3 | 3 | 0.0% |
| Q2 2020 | 26 | $11.5M | 3,409,862 | 2 | 5 | 7 | 0.0% |
| Q1 2020 | 25 | $8.1M | 2,717,246 | 1 | 6 | 6 | 0.0% |
| Q4 2019 | 31 | $11.8M | 2,803,766 | 1 | 8 | 10 | 0.0% |
| Q3 2019 | 31 | $10.0M | 2,563,341 | 4 | 3 | 10 | 0.0% |
| Q2 2019 | 30 | $11.8M | 2,616,249 | 1 | 7 | 10 | 0.0% |
| Q1 2019 | 41 | $16.3M | 2,930,845 | 6 | 13 | 9 | 0.0% |
| Q4 2018 | 35 | $14.7M | 2,932,315 | 1 | 0 | 1 | 0.0% |