Data I/O Corporation
Data I/O Corporation (DAIO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · DAIO · as of Sep 30, 2025
Ownership Breakdown
26
Institutional Holders
$10.67M
Total Inst. Value
▲ $745,521 vs Q2
9.39M
Shares Outstanding
freeFloat 95.07%
3.19M
13F Shares Held
▼ 23,428 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
DAIO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
KANEN WEALTH MANAGEMENT LLC instruments for meas & testing of electricity & elec signals | 839.4K | 9.03% | 9.03% | $2.82B | Nov 14, 2025 | — held |
RENAISSANCE TECHNOLOGIES LLC instruments for meas & testing of electricity & elec signals | 476.8K | 5.13% | 5.13% | $1.59B | Nov 13, 2025 | ▲ 491 |
VANGUARD GROUP INC instruments for meas & testing of electricity & elec signals | 358.5K | 3.86% | 3.86% | $1.20B | Nov 7, 2025 | — held |
PENBROOK MANAGEMENT LLC instruments for meas & testing of electricity & elec signals | 352.8K | 3.79% | 3.79% | $1.18B | Oct 22, 2025 | ▲ 3.0K |
KOVACK ADVISORS, INC. instruments for meas & testing of electricity & elec signals | 263.2K | 2.83% | 2.83% | $879.19M | Nov 10, 2025 | ▼ 6.2K |
DIMENSIONAL FUND ADVISORS LP instruments for meas & testing of electricity & elec signals | 261.1K | 2.81% | 2.81% | $872.16M | Nov 12, 2025 | ▼ 9.0K |
ACADIAN ASSET MANAGEMENT LLC instruments for meas & testing of electricity & elec signals | 133.2K | 1.43% | 1.43% | $444.00M | Nov 13, 2025 | — held |
BANK OF NEW YORK MELLON CORP instruments for meas & testing of electricity & elec signals | 116.8K | 1.26% | 1.26% | $389.95M | Nov 3, 2025 | — held |
GEODE CAPITAL MANAGEMENT, LLC instruments for meas & testing of electricity & elec signals | 101.6K | 1.09% | 1.09% | $339.47M | Nov 12, 2025 | ▲ 4.0K |
CITADEL ADVISORS LLC instruments for meas & testing of electricity & elec signals | 79.5K | 85.52% | 85.52% | $265.53M | Nov 14, 2025 | ▲ 79.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
7
Increased
+101.8K shares1
New Positions
first time holders6
Decreased
−25.7K shares2
Sold Out
fully exitedNet shares change (top 50)
+76.1K
+101.8K / −25.7K
Net new holders
+0
1 new / 2 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
DAIO insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Wentworth William O. President | Dec 2, 2025 | Award | 7,455 | $2.78 | $20.8K | 52.9K | Form 4 ↗ |
Wentworth William O. President | Dec 3, 2025 | Award | 1,100 | $2.80 | $3.1K | 54.0K | Form 4 ↗ |
WASZAK STEVEN M director | Dec 3, 2025 | Award | 7,950 | $2.79 | $22.2K | 8.0K | Form 4 ↗ |
DiBona Charles Joseph Vice President & CFO | Sep 1, 2025 | Award | 100,000 | $3.15 | $315.4K | 100.0K | Form 4 ↗ |
SMITH EDWARD J director | May 15, 2025 | Award | 20,300 | $2.48 | $50.3K | 63.1K | Form 4 ↗ |
Larson Garrett Riley director | May 15, 2025 | Award | 20,300 | $2.48 | $50.3K | 30.6K | Form 4 ↗ |
Brown Douglas Wells director | May 15, 2025 | Award | 20,300 | $2.48 | $50.3K | 101.8K | Form 4 ↗ |
Washlow Sally A. director | May 15, 2025 | Award | 20,300 | $2.48 | $50.3K | 72.7K | Form 4 ↗ |
SMITH EDWARD J director | May 7, 2025 | Purchase | 5,000 | $2.46 | $12.3K | 42.8K | Form 4 ↗ |
Wentworth William O. President | May 1, 2025 | Purchase | 10,585 | $2.36 | $25.0K | 35.1K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Data I/O Corporation (DAIO) is primarily owned by institutional investors, who hold approximately 34.0% of total shares outstanding. Company insiders own approximately 4.93%, while retail and public investors account for the remaining 61.10%.
The largest institutional shareholder of Data I/O Corporation is KANEN WEALTH MANAGEMENT LLC, holding approximately 839,421 shares — equal to 9.03% of outstanding shares — as of September 30, 2025.
A total of 26 institutional investors currently hold DAIO stock, with a combined institutional value of approximately $10,670,616 as of the most recent 13F filing period.
Frequently asked questions
DAIO ownershipData I/O Corporation (DAIO) is primarily owned by institutional investors, who hold approximately 34.0% of shares. The largest shareholder is KANEN WEALTH MANAGEMENT LLC with a 9.03% stake. Company insiders hold 4.93%. Data sourced from SEC Form 13F as of September 30, 2025.