Data I/O Corp (DAIO) Insider Ownership

Historic Insider Ownership Trends

As of April 25, 2026, Data I's top three insider holders are Anthony Ambrose (President, 476.53K shares), Anthony Ambrose (President, 471.05K shares), Anthony Ambrose (President, 442.42K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Anthony Ambrose President 476,526 0 22 Jun, 2023
Anthony Ambrose President 471,048 0 03 Jun, 2024
Anthony Ambrose President 442,418 0 03 Jun, 2024
Joel S Hatlen Vice President Cfo Coo 190,521 0 08 Jul, 2021
Joel S Hatlen Vice President Cfo Coo 178,119 0 02 Jun, 2023
Rajeev Gulati Vice President Cto 167,897 0 03 May, 2024
Rajeev Gulati Vice President Cto 159,226 0 03 May, 2024
Michael R Tidwell Vp Mktg Corp Bus Dev 147,774 0 03 May, 2024
Rajeev Gulati Vice President Cto 146,606 0 23 May, 2023
Michael R Tidwell Vice President Mktg Bus Dev 144,291 0 02 Jun, 2023
Michael R Tidwell Vp Mktg Corp Bus Dev 139,103 0 03 May, 2024
Douglas Wells Brown - 101,759 0 19 May, 2025
Charles Joseph Dibona Vice President Cfo 100,000 0 30 Sep, 2025
Gerald Yat Ng Vice President Cfo 93,750 0 03 May, 2024
Gerald Yat Ng Vice President Finance 75,000 0 06 Jul, 2023
Sally A. Washlow - 72,651 0 19 May, 2025
Douglas Wells Brown - 64,359 0 22 May, 2023
William O. Wentworth President 53,972 0 05 Dec, 2025
Sally A. Washlow - 38,251 0 22 May, 2023
Garrett Riley Larson - 30,572 0 19 May, 2025
Cheemin Bo-Linn - 15,401 0 20 May, 2022
Steven M Waszak - 7,950 0 04 Dec, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
02 Dec, 2025 William O. Wentworth Common Stock A 7,455 $2.78 52,872 D A
03 Dec, 2025 William O. Wentworth Common Stock A 1,100 $2.80 53,972 D A
03 Dec, 2025 Steven M Waszak Common Stock A 7,950 $2.79 7,950 D A
01 Sep, 2025 Charles Joseph Dibona Common Stock A 100,000 $3.15 100,000 D A
15 May, 2025 Garrett Riley Larson Common Stock A 20,300 $2.48 30,572 D A
15 May, 2025 Sally A. Washlow Common Stock A 20,300 $2.48 72,651 D A
15 May, 2025 Douglas Wells Brown Common Stock A 20,300 $2.48 101,759 D A
01 May, 2025 William O. Wentworth Common Stock A 10,585 $2.36 35,085 D P
06 May, 2025 William O. Wentworth Common Stock A 10,332 $2.42 45,417 D P
02 May, 2025 William O. Wentworth Common Stock A 10,585 $2.36 35,085 D A
23 Jan, 2025 Garrett Riley Larson Common Stock A 5,272 $2.91 5,272 D A
03 Sep, 2024 William O. Wentworth Common Stock A 200,000 $2.39 200,000 D A
26 Aug, 2024 Douglas Wells Brown Common Stock A 3,000 $2.66 81,459 D P
01 Jun, 2024 Anthony Ambrose Common Stock D 6,652 $2.87 452,396 D F
01 Jun, 2024 Anthony Ambrose Common Stock D 9,978 $2.87 442,418 D F
01 Jun, 2024 Anthony Ambrose COMMON STOCK D 8,870 $2.87 433,548 D F
01 Jun, 2024 Anthony Ambrose COMMON STOCK A 37,500 $2.87 471,048 D A
18 May, 2024 Rajeev Gulati COMMON STOCK D 2,223 $2.91 160,708 D F
18 May, 2024 Michael R Tidwell COMMON STOCK D 2,965 $2.91 141,326 D F
18 May, 2024 Anthony Ambrose COMMON STOCK D 9,978 $2.91 459,058 D F