// company-profile
Data I/o Corp
DAIOExchangeNasdaqSectorInstruments For Meas & Testing of Electricity & Elec SignalsInc.WAFilings46Insiders12
// api This Data I/o Corp insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
No insider transactions in the last 30 days.
No insider activity recorded for DAIO in the last 90 days.
Institutional Ownership
Top 13F-HR holders of Data I/o Corp as of 2026-03-31
Total reported AUM
$7.0M
QoQ change
-5.2%
Reporting period
2026-03-31
#1
Kanen Wealth Management LLC
CIK 1681614
$2.1M
839K shares
#2
RENAISSANCE TECHNOLOGIES LLC
CIK 1037389
$1.0M
408K shares
#3
Penbrook Management LLC
CIK 1381055
$902,830
357K shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Dec 3, 2025 | Wentworth William O. | DAIO | Award | 1,100 | $2.80 | $3K |
| Dec 3, 2025 | WASZAK STEVEN M | DAIO | Award | 7,950 | $2.79 | $22K |
| Dec 2, 2025 | Wentworth William O. | DAIO | Award | 7,455 | $2.78 | $21K |
| Sep 1, 2025 | DiBona Charles Joseph | DAIO | Award | 100,000 | $3.15 | $315K |
| May 15, 2025 | Larson Garrett Riley | DAIO | Award | 20,300 | $2.48 | $50K |
45 more transactions hidden
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