33 institutions reported holding $7.5M of DATA I O CORP (DAIO) in SEC 13F filings for 2026-03-31. Largest institutional holders: Kanen Wealth Management LLC ($2.1M), RENAISSANCE TECHNOLOGIES LLC ($1.0M), Penbrook Management LLC ($902,830), VANGUARD CAPITAL MANAGEMENT LLC ($757,474), Kovack Advisors, Inc. ($635,115). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Kanen Wealth Management LLC | $2.1M | 839,421 | Hold |
| 2 | RENAISSANCE TECHNOLOGIES LLC | $1.0M | 407,643 | Trimmed |
| 3 | Penbrook Management LLC | $902,830 | 356,850 | Hold |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | $757,474 | 299,397 | New |
| 5 | Kovack Advisors, Inc. | $635,115 | 267,981 | Trimmed |
| 6 | DIMENSIONAL FUND ADVISORS LP | $355,918 | 140,679 | Trimmed |
| 7 | ACADIAN ASSET MANAGEMENT LLC | $313,000 | 124,119 | Trimmed |
| 8 | CITADEL ADVISORS LLC | $271,722 | 107,400 | Trimmed |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | $219,831 | 86,867 | Trimmed |
| 10 | ESSEX INVESTMENT MANAGEMENT CO LLC | $188,842 | 74,641 | Hold |
| 11 | VANGUARD FIDUCIARY TRUST CO | $116,008 | 45,853 | New |
| 12 | Steward Partners Investment Advisory, LLC | $109,984 | 43,472 | Hold |
| 13 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $67,897 | 26,837 | Added |
| 14 | LPL Financial LLC | $57,039 | 22,545 | New |
| 15 | JAMES INVESTMENT RESEARCH, INC. | $56,677 | 22,402 | Hold |
| 16 | Legato Capital Management LLC | $44,401 | 17,550 | Hold |
| 17 | BlackRock, Inc. | $43,048 | 17,015 | Hold |
| 18 | STATE STREET CORP | $40,910 | 16,170 | Hold |
| 19 | GOLDMAN SACHS GROUP INC | $34,884 | 13,788 | New |
| 20 | NORTHERN TRUST CORP | $34,094 | 13,476 | Hold |
| 21 | NewEdge Advisors, LLC | $22,402 | 22,402 | Hold |
| 22 | Vanguard Global Advisers, LLC | $12,964 | 5,124 | New |
| 23 | SIMPLEX TRADING, LLC | $6,980 | 2,759 | Added |
| 24 | Tower Research Capital LLC (TRC) | $4,253 | 1,681 | Trimmed |
| 25 | UBS Group AG | $2,381 | 941 | New |
Source: SEC Form 13F filings · as of 2026-03-31