DAIO
Data I/O Corp
$3.44
+0.04 (+1.18%)
At close · Jul 15
Market Cap
$31.61M
Shares
9,394,422
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 30
Total Value: $7,532,685
Total Shares: 2,977,351
Institutional Ownership Trend
25 quarters
Holder Concentration
Across 30 13F filers · Δ vs Dec 31, 2025Top Holder
28.2%
+3.1 pts
Top 5
72.9%
+0.9 pts
Top 10
90.9%
−3.6 pts
HHI
1,384
Broadly held+74
Quarterly Activity
vs Dec 31, 2025
New
7
Increased
3
Decreased
7
Sold Out
4
Unchanged
13
Holder count:
+3
Institutional value:
-29.0%
Shares held:
-11.1%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | +11,140 | 26,837 | |
| Mid SIMPLEX TRADING, LLC | +827 | 2,759 | |
| Mega ROYAL BANK OF CANADA | +26 | 136 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | −319,282 | 107,400 | |
| Mega DIMENSIONAL FUND ADVISORS LP | −39,570 | 140,679 | |
| Large RENAISSANCE TECHNOLOGIES LLC | −29,994 | 407,643 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | −17,715 | 86,867 | |
| Large ACADIAN ASSET MANAGEMENT LLC | −1,100 | 124,119 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD CAPITAL MANAGEMENT LLC | 299,397 | $757,474 | |
| Mega VANGUARD FIDUCIARY TRUST CO | 45,853 | $116,008 | |
| Mega LPL Financial LLC | 22,545 | $57,038 | |
| Mega GOLDMAN SACHS GROUP INC | 13,788 | $34,883 | |
| Mega Vanguard Global Advisers, LLC | 5,124 | $12,963 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mega VANGUARD GROUP INC | 350,374 | $1,110,685 | |
| Mid DRW Securities, LLC | 11,731 | $37,187 | |
| Small Capital Analysts, LLC | 159 | $504 | |
| Mega BANK OF AMERICA CORP /DE/ | 87 | $275 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Small Kanen Wealth Management LLC | $2,123,735 | 28.19% | 839,421 | Shares | Sole | 2026-05-18 | ||||
| Large RENAISSANCE TECHNOLOGIES LLC | $1,031,336 | 13.69% | 407,643 | Shares | Sole | 2026-05-14 | ||||
| Small Penbrook Management LLC | $902,830 | 11.99% | 356,850 | Shares | Sole | 2026-04-21 | ||||
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $757,474 | 10.06% | 299,397 | Shares | Defined | 2026-05-15 | ||||
| Mid Kovack Advisors, Inc. | $677,991 | 9.00% | 267,981 | Shares | Sole | 2026-05-13 | ||||
| Mega DIMENSIONAL FUND ADVISORS LP | $355,917 | 4.72% | 140,679 | Shares | Sole | 2026-05-07 | ||||
| Large ACADIAN ASSET MANAGEMENT LLC | $314,021 | 4.17% | 124,119 | Shares | Defined | 2026-05-13 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $219,773 | 2.92% | 86,867 | Shares | Defined | 2026-05-15 | ||||
| Small ESSEX INVESTMENT MANAGEMENT CO LLC | $188,841 | 2.51% | 74,641 | Shares | Sole | 2026-05-11 | ||||
| Mega CITADEL ADVISORS LLC | $139,150 | 1.85% | 55,000 | Put | Defined | 2026-05-15 | ||||
| Mega CITADEL ADVISORS LLC | $132,572 | 1.76% | 52,400 | Call | Defined | 2026-05-15 | ||||
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $116,008 | 1.54% | 45,853 | Shares | Defined | 2026-05-08 | ||||
| Large Steward Partners Investment Advisory, LLC | $109,984 | 1.46% | 43,472 | Shares | Sole | 2026-05-08 | ||||
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $67,897 | 0.90% | 26,837 | Shares | Other | 2026-05-15 | ||||
| Mega LPL Financial LLC | $57,038 | 0.76% | 22,545 | Shares | Sole | 2026-05-06 | ||||
| Large NewEdge Advisors, LLC | $56,677 | 0.75% | 22,402 | Shares | Sole | 2026-05-18 | ||||
| Small JAMES INVESTMENT RESEARCH, INC. | $56,677 | 0.75% | 22,402 | Shares | Sole | 2026-04-24 | ||||
| Mid Legato Capital Management LLC | $44,401 | 0.59% | 17,550 | Shares | Other | 2026-05-14 | ||||
| Mega BlackRock, Inc. | $43,047 | 0.57% | 17,015 | Shares | Sole | 2026-05-13 | ||||
| Mega STATE STREET CORP | $40,910 | 0.54% | 16,170 | Shares | Defined | 2026-05-15 | ||||
| Mega GOLDMAN SACHS GROUP INC | $34,883 | 0.46% | 13,788 | Shares | Defined | 2026-05-15 | ||||
| Mega NORTHERN TRUST CORP Bank | $34,094 | 0.45% | 13,476 | Shares | Defined | 2026-05-14 | ||||
| Mega Vanguard Global Advisers, LLC | $12,963 | 0.17% | 5,124 | Shares | Defined | 2026-05-08 | ||||
| Mid SIMPLEX TRADING, LLC | $6,980 | 0.09% | 2,759 | Shares | Sole | 2026-05-14 | ||||
| Mid Tower Research Capital LLC (TRC) | $4,252 | 0.06% | 1,681 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $2,380 | 0.03% | 941 | Shares | Defined | 2026-05-05 | ||||
| Mega ROYAL BANK OF CANADA Bank | $344 | 0.00% | 136 | Shares | Defined | 2026-05-15 | ||||
| Small BARD ASSOCIATES INC | $253 | 0.00% | 100 | Shares | Sole | 2026-05-08 | ||||
| Mid GROUP ONE TRADING LLC | $253 | 0.00% | 100 | Shares | Sole | 2026-05-13 | ||||
| Large HUNTINGTON NATIONAL BANK Bank | $2 | 0.00% | 1 | Shares | Defined | 2026-05-15 | ||||
| Mid SBI Securities Co., Ltd. Broker-Dealer | $2 | 0.00% | 1 | Shares | Defined | 2026-04-28 | ||||
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