Data I/O Corp (DAIO) Insider Ownership

Historic Insider Ownership Trends

As of March 23, 2026, the three largest insider holders of DAIO are Anthony Ambrose (President, 471.05K shares), Joel S Hatlen (Vice President Cfo Coo, 178.12K shares), Rajeev Gulati (Vice President Cto, 167.90K 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 471,048 0 03 Jun, 2024
Joel S Hatlen Vice President Cfo Coo 178,119 0 02 Jun, 2023
Rajeev Gulati Vice President Cto 167,897 0 03 May, 2024
Michael R Tidwell Vp Mktg Corp Bus Dev 147,774 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
Sally A. Washlow 72,651 0 19 May, 2025
Mark J Gallenberger 69,509 0 20 May, 2021
Edward J Smith 63,115 0 19 May, 2025
William O. Wentworth President 53,972 0 05 Dec, 2025
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 Edward J Smith Common Stock A 20,300 $2.48 63,115 D A
15 May, 2025 Douglas Wells Brown Common Stock A 20,300 $2.48 101,759 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
07 May, 2025 Edward J Smith Common Stock A 5,000 $2.46 42,815 D P
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 Michael R Tidwell COMMON STOCK D 2,965 $2.91 141,326 D F