# DATA I O CORP (DAIO)

> Institutional ownership reported to the SEC as of Q2 2026, from Form 13F filings. Source: https://holderbook.com/stocks/DAIO/

- Reporting holders: 35
- Reported value: $12.7M
- Shares held by institutions: 3,210,633 of 10,395,627 outstanding
- Held through calls: 0.7%
- Held through puts: 0.0%

A 13F reports long US equity positions only. Shorts, bonds, foreign listings and cash are not visible here, and positions are disclosed up to 45 days after the quarter ends.

## Largest holders

| Manager | Value | Shares | Share of their book | Quarters held |
|---|---|---|---|---|
| [Kanen Wealth Management LLC](https://holderbook.com/funds/1681614-kanen-wealth-management-llc/) | $3.3M | 839,421 | 0.8% | 21 |
| [RENAISSANCE TECHNOLOGIES LLC](https://holderbook.com/funds/1037389-renaissance-technologies-llc/) | $1.5M | 392,443 | 0.0% | 31 |
| [Penbrook Management LLC](https://holderbook.com/funds/1381055-penbrook-management-llc/) | $1.4M | 355,850 | 0.9% | 31 |
| [VANGUARD CAPITAL MANAGEMENT LLC](https://holderbook.com/funds/2100119-vanguard-capital-management-llc/) | $1.3M | 323,672 | 0.0% | 2 |
| [Kovack Advisors, Inc.](https://holderbook.com/funds/1728321-kovack-advisors-inc/) | $1.1M | 285,481 | 0.1% | 23 |
| [CITADEL ADVISORS LLC](https://holderbook.com/funds/1423053-citadel-advisors-llc/) | $684.5K | 173,738 | 0.0% | 15 |
| [DIMENSIONAL FUND ADVISORS LP](https://holderbook.com/funds/354204-dimensional-fund-advisors-lp/) | $554.3K | 140,679 | 0.0% | 31 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://holderbook.com/funds/1214717-geode-capital-management-llc/) | $453.4K | 115,057 | 0.0% | 31 |
| [ACADIAN ASSET MANAGEMENT LLC](https://holderbook.com/funds/916542-acadian-asset-management-llc/) | $427.0K | 108,582 | 0.0% | 31 |
| [ESSEX INVESTMENT MANAGEMENT CO LLC](https://holderbook.com/funds/201772-essex-investment-management-co-llc/) | $293.8K | 74,558 | 0.0% | 14 |
| [VANGUARD FIDUCIARY TRUST CO](https://holderbook.com/funds/933478-vanguard-fiduciary-trust-co/) | $231.1K | 58,643 | 0.0% | 2 |
| [SUSQUEHANNA INTERNATIONAL GROUP, LLP](https://holderbook.com/funds/1446194-susquehanna-international-group-llp/) | $191.3K | 48,548 | 0.0% | 5 |
| [Steward Partners Investment Advisory, LLC](https://holderbook.com/funds/1723397-steward-partners-investment-advisory-llc/) | $171.3K | 43,472 | 0.0% | 5 |
| [STATE STREET CORP](https://holderbook.com/funds/93751-state-street-corp/) | $127.4K | 32,340 | 0.0% | 15 |
| [THOMPSON DAVIS & CO., INC.](https://holderbook.com/funds/1017284-thompson-davis-co-inc/) | $92.7K | 23,533 | 0.1% | 1 |
| [JAMES INVESTMENT RESEARCH, INC.](https://holderbook.com/funds/810384-james-investment-research-inc/) | $88.3K | 22,402 | 0.0% | 31 |
| [NewEdge Advisors, LLC](https://holderbook.com/funds/1633516-newedge-advisors-llc/) | $88.3K | 22,402 | 0.0% | 28 |
| [NORTHERN TRUST CORP](https://holderbook.com/funds/73124-northern-trust-corp/) | $86.0K | 21,827 | 0.0% | 31 |
| [LPL Financial LLC](https://holderbook.com/funds/1403438-lpl-financial-llc/) | $82.7K | 21,000 | 0.0% | 2 |
| [GROUP ONE TRADING LLC](https://holderbook.com/funds/932540-group-one-trading-llc/) | $79.0K | 6,450 | 0.0% | 4 |
| [JANE STREET GROUP, LLC](https://holderbook.com/funds/1595888-jane-street-group-llc/) | $69.8K | 17,727 | 0.0% | 1 |
| [Legato Capital Management LLC](https://holderbook.com/funds/1442641-legato-capital-management-llc/) | $69.1K | 17,550 | 0.0% | 7 |
| [BlackRock, Inc.](https://holderbook.com/funds/2012383-blackrock-inc/) | $67.0K | 17,015 | 0.0% | 8 |
| [XTX Topco Ltd](https://holderbook.com/funds/1828301-xtx-topco-ltd/) | $60.2K | 15,284 | 0.0% | 1 |
| [SIMPLEX TRADING, LLC](https://holderbook.com/funds/1488542-simplex-trading-llc/) | $55.1K | 4,279 | 0.0% | 1 |

## Quarter by quarter

| Quarter | Holders | Reported value |
|---|---|---|
| Q2 2026 | 35 | $12.7M |
| Q1 2026 | 28 | $7.4M |
| Q4 2025 | 27 | $9.7M |
| Q3 2025 | 26 | $10.9M |
| Q2 2025 | 26 | $10.6M |
| Q1 2025 | 26 | $7.5M |
| Q4 2024 | 30 | $8.7M |
| Q3 2024 | 29 | $8.1M |
| Q2 2024 | 31 | $9.1M |
| Q1 2024 | 31 | $11.8M |
| Q4 2023 | 30 | $8.4M |
| Q3 2023 | 29 | $12.9M |