Data I/O Corporation (DAIO) Ownership
DAIO ownership summary
as of October 18, 2026- Institutions
- 29.9% of shares outstanding
- Insiders
- 13.63% of shares outstanding
- Shares outstanding
- 10.4M
- Float
- 9.5M shares available to trade
- Short interest
- 0.16% 16K shares short
- Days to cover
- 0.72 short interest up 132.9% vs prior month
- Institutions 29.92%
- Insiders 13.63%
- Other investors 56.45%
DAIO top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Kanen Wealth Management LLC | 8.07% | 839K | $2.2M | — | June 30, 2026 |
| 2 | Renaissance Technologies Corp | 3.78% | 392K | $1.0M | −15,200 (−3.7%) | June 30, 2026 |
| 3 | Penbrook Management LLC | 3.42% | 356K | $918,093 | −1,000 (−0.3%) | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 3.11% | 324K | $835,074 | +24,275 (+8.1%) | June 30, 2026 |
| 5 | Kovack Advisors Inc | 2.75% | 285K | $736,541 | +17,500 (+6.5%) | June 30, 2026 |
| 6 | Dimensional Fund Advisors, Inc. | 1.35% | 141K | $362,952 | — | June 30, 2026 |
| 7 | Geode Capital Management, LLC | 1.11% | 115K | $296,847 | +28,190 (+32.5%) | June 30, 2026 |
| 8 | Acadian Asset Management LLC | 1.04% | 109K | $280,142 | −15,537 (−12.5%) | June 30, 2026 |
| 9 | Citadel Advisors Llc | 0.84% | 87K | $224,122 | +86,869 (0.0%) | June 30, 2026 |
| 10 | Essex Investment Management Company, LLC | 0.72% | 75K | $192,360 | −83 (−0.1%) | June 30, 2026 |
| 11 | Vanguard Fiduciary Trust Co | 0.56% | 59K | $151,299 | +12,790 (+27.9%) | June 30, 2026 |
| 12 | Susquehanna International Group, LLP | 0.47% | 49K | $125,254 | +21,711 (+80.9%) | June 30, 2026 |
| 13 | Steward Partners Investment Advisory, LLC | 0.42% | 43K | $112,158 | — | June 30, 2026 |
| 14 | Thompson Davis & Co Inc | 0.23% | 24K | $60,715 | +23,533 (0.0%) | June 30, 2026 |
| 15 | James Investment Research, Inc. | 0.22% | 22K | $57,797 | — | June 30, 2026 |
| 16 | Goss Wealth Management LLC | 0.22% | 22K | $57,797 | — | June 30, 2026 |
| 17 | Northern Trust Corp | 0.21% | 22K | $56,314 | +8,351 (+62.0%) | June 30, 2026 |
| 18 | LPL Financial Corp | 0.20% | 21K | $54,180 | −1,545 (−6.9%) | June 30, 2026 |
| 19 | Jane Street Group LLC | 0.17% | 18K | $45,736 | +17,727 (0.0%) | June 30, 2026 |
| 20 | Legato Capital Management LLC | 0.17% | 18K | $45,279 | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 241K shares and 5 cut 33K.
DAIO top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Philotimo Focused Growth and Income | 3.15% | 327K | $844,695 | — | June 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 2.06% | 214K | $552,744 | — | August 31, 2026 |
| 3 | Fidelity Extended Market Index | 0.46% | 47K | $122,029 | −254 (−0.5%) | August 31, 2026 |
| 4 | DFA US Micro Cap I | 0.44% | 46K | $119,033 | — | August 31, 2026 |
| 5 | DFA US Small Cap I | 0.30% | 32K | $81,696 | — | August 31, 2026 |
| 6 | Fidelity Total Market Index | 0.19% | 20K | $50,906 | — | August 31, 2026 |
| 7 | Fidelity Series Total Market Index | 0.16% | 17K | $44,172 | — | August 31, 2026 |
| 8 | Fidelity Nasdaq Composite Index | 0.14% | 15K | $38,839 | — | August 31, 2026 |
| 9 | LVIP Dimensional US Core Equity 2 Std | 0.07% | 7,146 | $18,437 | — | June 30, 2026 |
| 10 | Vanguard U.S. Eq Idx £ Acc | 0.05% | 5,124 | $13,220 | — | August 31, 2026 |
| 11 | DFA US Sustainability Core 1 | 0.04% | 4,622 | $11,925 | — | August 31, 2026 |
| 12 | DFA US Core Equity 2 I | 0.04% | 4,203 | $10,844 | — | August 31, 2026 |
| 13 | Dimensional US Core Equity 1 ETF | 0.03% | 3,526 | $9,097 | — | September 24, 2026 |
| 14 | Dimensional US Equity Market ETF | 0.03% | 3,489 | $9,002 | — | September 30, 2026 |
| 15 | Dimensional US Sustainability Core 1 ETF | 0.03% | 3,442 | $8,880 | — | September 30, 2026 |
| 16 | DFA US Vector Equity Class F | 0.03% | 3,208 | $8,277 | — | July 31, 2026 |
| 17 | Dimensional Global Core Equity USD Acc | 0.03% | 2,772 | $7,152 | — | August 31, 2026 |
| 18 | DFA US Social Core Equity 2 Portfolio | 0.02% | 1,818 | $4,690 | — | August 31, 2026 |
| 19 | DFA US Core Equity Class F | 0.01% | 1,500 | $3,870 | — | July 31, 2026 |
| 20 | DFA US Vector Equity I | 0.01% | 1,500 | $3,870 | — | August 31, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
DAIO insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2025-05-07 | Edward J Smith | Buy | $2.46 | 5,000 | $12,300 |
| 2025-05-06 | William O Wentworth | Buy | $2.42 | 10,332 | $25,003 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
DAIO shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns DAIO
Institutional investors own 29.9% of Data I/O's shares and insiders 13.63%. The largest holder is Kanen Wealth Management LLC with 8.07% of the shares (839K), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 5 reduced their stake in the latest filings. Short interest is 0.16% of the float, or 0.72 days of average trading volume. The share count rose 17.0% since 2014.
Related: DAIO analyst forecast, DAIO key metrics. See the DAIO stock overview for the latest quote and news.
DAIO ownership FAQ
Who owns the most Data I/O stock?
The largest shareholders of Data I/O are Kanen Wealth Management LLC (8.07%), Renaissance Technologies Corp (3.78%), Penbrook Management LLC (3.42%), Vanguard Capital Management, LLC (3.11%), Kovack Advisors Inc (2.75%).
What percentage of Data I/O is owned by institutions?
Institutions hold 29.9% of Data I/O's shares outstanding; insiders hold 13.63%.
Which funds own Data I/O?
The largest fund holders of Data I/O are Philotimo Focused Growth and Income (3.15%), Vanguard MStar Total Stk Mkt Idx Invest (2.06%), Fidelity Extended Market Index (0.46%), DFA US Micro Cap I (0.44%), DFA US Small Cap I (0.30%).
What is Data I/O's short interest?
16K shares of Data I/O were sold short, 0.16% of the float; at the average daily volume it would take 0.72 days to cover.
Are insiders buying or selling Data I/O?
Of the latest 2 reported insider transactions in Data I/O (since May 6, 2025), 2 were purchases and 0 were sales.
How many shares of Data I/O are outstanding?
Data I/O has 10.4M shares outstanding, of which 9.5M are in the public float.