DAIONasdaqInstruments For Meas & Testing of Electricity & Elec SignalsFiscal year ends December 11
DATA I/O CORP
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 14, 2026
$2.52−0.06 (-2.33%)
Close on Oct 19, 2026
- Market cap
- $24.12M
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
29.9%
3M of 10M shares
Institutional holders
35
9 new, 3 sold out
Net institutional buying
0M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Kanen David | 839,421 | 9.10% | 13G (passive) amendment | May 22, 2025 |
| Lytton Laurence W | 1,026,424 | 9.90% | 13G (passive) | Jun 17, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of DAIO | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Kanen Wealth Management LLC | 839,421 | 8.07% | $3.29M | – | 0.80% |
| Renaissance Technologies LLC | 392,443 | 3.78% | $1.55M | −15,200 | 0.00% |
| Penbrook Management LLC | 355,850 | 3.42% | $1.40M | −1,000 | 0.89% |
| Vanguard Capital Management LLC | 323,672 | 3.11% | $1.28M | +24,275 | 0.00% |
| Kovack Advisors, Inc. | 285,481 | 2.75% | $1.11M | +17,500 | 0.05% |
| Dimensional Fund Advisors LP | 140,679 | 1.35% | $554.28K | – | 0.00% |
| Geode Capital Management, LLC | 115,057 | 1.11% | $453.42K | +28,190 | 0.00% |
| Acadian Asset Management LLC | 108,582 | 1.04% | $427 | −15,537 | 0.00% |
| Citadel Advisors LLC | 86,869 | 0.84% | $342.26K | New | 0.00% |
| Essex Investment Management Co LLC | 74,558 | 0.72% | $293.76K | −83 | 0.04% |
| Vanguard Fiduciary Trust Co | 58,643 | 0.56% | $231.05K | +12,790 | 0.00% |
| Susquehanna International Group, Llp | 48,548 | 0.47% | $191.28K | +21,711 | 0.00% |
| Steward Partners Investment Advisory, LLC | 43,472 | 0.42% | $171.28K | – | 0.00% |
| Thompson Davis & Co., Inc. | 23,533 | 0.23% | $92.72K | New | 0.06% |
| James Investment Research Inc | 22,402 | 0.22% | $88.26K | – | 0.01% |
| NewEdge Advisors, LLC | 22,402 | 0.22% | $88.26K | – | 0.00% |
| Northern Trust Corp | 21,827 | 0.21% | $86.00K | +8,351 | 0.00% |
| LPL Financial LLC | 21,000 | 0.20% | $82.74K | −1,545 | 0.00% |
| Jane Street Group, LLC | 17,727 | 0.17% | $69.84K | New | 0.00% |
| Legato Capital Management LLC | 17,550 | 0.17% | $69.15K | – | 0.01% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 35 | 3M | 29.9% | 9 / 9 | 6 / 3 | 0M | 0M |
| Q1 2026 | 29 | 3M | 27.6% | 7 / 3 | 6 / 4 | 0M | 0M |
| Q4 2025 | 27 | 3M | 28.4% | 3 / 8 | 7 / 2 | 0M | 0M |
| Q3 2025 | 26 | 3M | 30.7% | 2 / 5 | 7 / 2 | 0M | 0M |
| Q2 2025 | 26 | 3M | 33.5% | 3 / 10 | 6 / 3 | 0M | 0M |
| Q1 2025 | 26 | 3M | 29.5% | 1 / 6 | 5 / 4 | 0M | 0M |
| Q4 2024 | 29 | 3M | 30.2% | 4 / 3 | 6 / 4 | 0M | 0M |
| Q3 2024 | 29 | 3M | 30.5% | 3 / 5 | 7 / 5 | 0M | 0M |
| Q2 2024 | 32 | 3M | 31.6% | 3 / 6 | 9 / 3 | 0M | 0M |
| Q1 2024 | 32 | 3M | 32.3% | 3 / 12 | 10 / 1 | 1M | 0M |
| Q4 2023 | 30 | 3M | 27.5% | 3 / 9 | 9 / 2 | 0M | 1M |
| Q3 2023 | 29 | 3M | 32.5% | 2 / 7 | 12 / 2 | 0M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of DAIO | Value | % of fund | As of |
|---|---|---|---|---|---|
| Philotimo Focused Growth & Income | 327,401 | 3.15% | $1.29M | 0.94% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 214,242 | 2.06% | $844.11K | 0.00% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 90,237 | 0.87% | $355.53K | 0.00% | Jun 30, 2026 |
| U.S. Micro Cap Portfolio | 46,137 | 0.44% | $131.03K | 0.00% | Jul 31, 2026 |
| U.S. Small Cap Portfolio | 31,665 | 0.30% | $89.93K | 0.00% | Jul 31, 2026 |
| Fidelity Extended Market Index Fund | 25,475 | 0.25% | $107.76K | 0.00% | May 31, 2026 |
| Fidelity Total Market Index Fund | 19,731 | 0.19% | $83.46K | 0.00% | May 31, 2026 |
| Fidelity Nasdaq Composite Index Fund | 15,054 | 0.14% | $63.68K | 0.00% | May 31, 2026 |
| Fidelity Series Total Market Index Fund | 11,134 | 0.11% | $47.10K | 0.00% | May 31, 2026 |
| LVIP Dimensional U.S. Core Equity 2 Fund | 7,146 | 0.07% | $28.16K | 0.00% | Jun 30, 2026 |
| U.S. Sustainability Core 1 Portfolio | 4,622 | 0.04% | $13.13K | 0.00% | Jul 31, 2026 |
| U.S. Core Equity 2 Portfolio | 4,203 | 0.04% | $11.94K | 0.00% | Jul 31, 2026 |
| Dimensional US Core Equity 1 ETF | 3,526 | 0.03% | $10.01K | 0.00% | Jul 31, 2026 |
| Dimensional U.S. Equity Market ETF | 3,489 | 0.03% | $9.91K | 0.00% | Jul 31, 2026 |
| Dimensional US Sustainability Core 1 ETF | 3,442 | 0.03% | $9.78K | 0.00% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| William O. Wentworth | President, Director | 52,872 | 0.51% | Dec 5, 2025 |
| Charles Joseph DiBona | Vice President & CFO | 89,655 | 0.86% | Sep 3, 2026 |
| Gerald Yat Ng | Vice President CFO | 88,191 | 0.85% | Feb 12, 2025 |
| Garrett Riley Larson | Director | 46,832 | 0.45% | Jul 10, 2026 |
| Edward J. Smith | Director | 79,375 | 0.76% | Jul 10, 2026 |
| Steven M. Waszak | Director | 24,210 | 0.23% | Jul 10, 2026 |
| Sally A. Washlow | Director | 88,911 | 0.86% | Jul 10, 2026 |
| Douglas Wells Brown | Director | 101,759 | 0.98% | May 19, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Charles Joseph DiBona Vice President & CFO | Sep 1, 2026 | Tax withholding | −10,345 | $2.89 | $29.90K | 89,655 |
| Garrett Riley Larson Director | Jul 8, 2026 | Award | +16,260 | $3.56 | $57.89K | 46,832 |
| Edward J. Smith Director | Jul 8, 2026 | Award | +16,260 | $3.56 | $57.89K | 79,375 |
| Steven M. Waszak Director | Jul 8, 2026 | Award | +16,260 | $3.56 | $57.89K | 24,210 |
| Sally A. Washlow Director | Jul 8, 2026 | Award | +16,260 | $3.56 | $57.89K | 88,911 |
| William O. Wentworth President, Director | Dec 3, 2025 | Award | +1,100 | $2.80 | $3.08K | 53,972 |
| Steven M. Waszak Director | Dec 3, 2025 | Award | +7,950 | $2.79 | $22.18K | 7,950 |
| William O. Wentworth President, Director | Dec 2, 2025 | Award | +7,455 | $2.78 | $20.72K | 52,872 |
| Charles Joseph DiBona Vice President & CFO | Sep 1, 2025 | Award | +100,000 | $3.15 | $315.00K | 100,000 |
| Garrett Riley Larson Director | May 15, 2025 | Award | +20,300 | $2.48 | $50.34K | 30,572 |
| Douglas Wells Brown Director | May 15, 2025 | Award | +20,300 | $2.48 | $50.34K | 101,759 |
| Sally A. Washlow Director | May 15, 2025 | Award | +20,300 | $2.48 | $50.34K | 72,651 |
| Edward J. Smith Director | May 15, 2025 | Award | +20,300 | $2.48 | $50.34K | 63,115 |
| Edward J. Smith Director | May 7, 2025 | Buy | +5,000 | $2.46 | $12.30K | 42,815 |
| William O. Wentworth President, Director | May 6, 2025 | Buy | +10,332 | $2.42 | $25.00K | 45,417 |
| William O. Wentworth President | May 2, 2025 | Award | +10,585 | $2.36 | $24.98K | 35,085 |
| William O. Wentworth President, Director | May 1, 2025 | Buy | +10,585 | $2.36 | $24.98K | 35,085 |
| Garrett Riley Larson Director | Jan 23, 2025 | Award | +5,272 | $2.91 | $15.34K | 5,272 |
| Douglas Wells Brown Director | Aug 26, 2024 | Buy | +3,000 | $2.66 | $7.98K | 81,459 |
| Gerald Yat Ng Vice President CFO | Jul 3, 2024 | Tax withholding | −5,559 | $2.79 | $15.51K | 88,191 |
| Gerald Yat Ng Vice President CFO | Jun 1, 2024 | Award | +18,750 | $2.87 | $53.81K | 93,750 |
| Anthony Ambrose President, Director | Jun 1, 2024 | Award | +37,500 | $2.87 | $107.63K | 471,048 |
| Anthony Ambrose President, Director | Jun 1, 2024 | Tax withholding | −8,870 | $2.87 | $25.46K | 433,548 |
| Anthony Ambrose President, Director | Jun 1, 2024 | Tax withholding | −9,978 | $2.87 | $28.64K | 442,418 |
| Anthony Ambrose President, Director | Jun 1, 2024 | Tax withholding | −6,652 | $2.87 | $19.09K | 452,396 |
| Michael R. Tidwell VP Mktg & Corp Bus Dev | Jun 1, 2024 | Tax withholding | −2,223 | $2.87 | $6.38K | 139,103 |
| Michael R. Tidwell VP Mktg & Corp Bus Dev | Jun 1, 2024 | Tax withholding | −1,976 | $2.87 | $5.67K | 135,274 |
| Michael R. Tidwell VP Mktg & Corp Bus Dev | Jun 1, 2024 | Award | +12,500 | $2.87 | $35.88K | 147,774 |
| Michael R. Tidwell VP Mktg & Corp Bus Dev | Jun 1, 2024 | Tax withholding | −1,853 | $2.87 | $5.32K | 137,250 |
| Rajeev Gulati Vice President CTO | Jun 1, 2024 | Award | +12,500 | $2.87 | $35.88K | 167,897 |
| Rajeev Gulati Vice President CTO | Jun 1, 2024 | Tax withholding | −1,976 | $2.87 | $5.67K | 155,397 |
| Rajeev Gulati Vice President CTO | Jun 1, 2024 | Tax withholding | −1,853 | $2.87 | $5.32K | 157,373 |
| Rajeev Gulati Vice President CTO | Jun 1, 2024 | Tax withholding | −1,482 | $2.87 | $4.25K | 159,226 |
| Rajeev Gulati Vice President CTO | May 18, 2024 | Tax withholding | −2,223 | $2.91 | $6.47K | 160,708 |
| Michael R. Tidwell Vice President Mktg & Bus Dev | May 18, 2024 | Tax withholding | −2,965 | $2.91 | $8.63K | 141,326 |
| Anthony Ambrose President, Director | May 18, 2024 | Tax withholding | −9,978 | $2.91 | $29.04K | 459,058 |
| William O. Wentworth Director | May 16, 2024 | Award | +14,100 | $2.93 | $41.31K | 24,500 |
| Sally A. Washlow Director | May 16, 2024 | Award | +14,100 | $2.93 | $41.31K | 52,351 |
| Edward J. Smith Director | May 16, 2024 | Award | +14,100 | $2.93 | $41.31K | 37,815 |
| Douglas Wells Brown Director | May 16, 2024 | Award | +14,100 | $2.93 | $41.31K | 78,459 |
| Anthony Ambrose President, Director | May 14, 2024 | Gift | −7,500 | $2.95 | $22.13K | 469,036 |
| Gerald Yat Ng Vice President Finance | Jul 3, 2023 | Award | +75,000 | $4.36 | $327.00K | 75,000 |
| Anthony Ambrose President, Director | Jun 1, 2023 | Tax withholding | −9,450 | $4.35 | $41.11K | 416,526 |
| Anthony Ambrose President, Director | Jun 1, 2023 | Tax withholding | −6,300 | $4.35 | $27.40K | 425,976 |
| Anthony Ambrose President, Director | Jun 1, 2023 | Award | +60,000 | $4.35 | $261.00K | 476,526 |
| Joel S. Hatlen Vice President CFO COO | Jun 1, 2023 | Tax withholding | −1,822 | $4.35 | $7.93K | 180,397 |
| Joel S. Hatlen Vice President CFO COO | Jun 1, 2023 | Tax withholding | −2,278 | $4.35 | $9.91K | 178,119 |
| Rajeev Gulati Vice President CTO | Jun 1, 2023 | Award | +20,000 | $4.35 | $87.00K | 162,931 |
| Rajeev Gulati Vice President CTO | Jun 1, 2023 | Tax withholding | −2,103 | $4.35 | $9.15K | 142,931 |
| Rajeev Gulati Vice President CTO | Jun 1, 2023 | Tax withholding | −1,572 | $4.35 | $6.84K | 145,034 |
| Michael R. Tidwell Vice President Mktg & Bus Dev | Jun 1, 2023 | Tax withholding | −1,758 | $4.35 | $7.65K | 125,757 |
| Michael R. Tidwell Vice President Mktg & Bus Dev | Jun 1, 2023 | Tax withholding | −1,465 | $4.35 | $6.37K | 124,291 |
| Michael R. Tidwell Vice President Mktg & Bus Dev | Jun 1, 2023 | Award | +20,000 | $4.35 | $87.00K | 144,291 |
| Anthony Ambrose President, Director | May 26, 2023 | Gift | −5,000 | $4.40 | $22.00K | 432,276 |
| Rajeev Gulati Vice President CTO | May 20, 2023 | Tax withholding | −1,882 | $4.54 | $8.54K | 146,606 |
| Joel S. Hatlen Vice President CFO COO | May 20, 2023 | Tax withholding | −2,132 | $4.54 | $9.68K | 182,219 |
| Anthony Ambrose President, Director | May 20, 2023 | Tax withholding | −6,300 | $4.54 | $28.60K | 437,276 |
| Douglas Wells Brown Director | May 18, 2023 | Award | +10,400 | $4.45 | $46.28K | 64,359 |
| Rajeev Gulati Vice President CTO | May 18, 2023 | Tax withholding | −2,823 | $4.45 | $12.56K | 148,488 |
| Michael R. Tidwell Vice President Mktg & Bus Dev | May 18, 2023 | Tax withholding | −2,965 | $4.45 | $13.19K | 127,514 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.