Red Oak Partners, LLC, The Red Oak Fund, LP, The Red Oak Long Fund, LP, and David Sandberg filed a Schedule 13G with the SEC on October 27, 2026, disclosing beneficial ownership of Data I/O Corp common stock as of the triggering event date of October 20, 2026.

Key Highlights

  • Aggregate stake: Red Oak Partners and David Sandberg each report beneficial ownership of 1,492,536 shares of Data I/O Corp common stock, representing 11.2% of the class.
  • Fund-level breakdown: The Red Oak Fund, LP holds 971,737 shares (7.3% of class); The Red Oak Long Fund, LP holds 520,799 shares (3.9% of class).
  • No sole voting or dispositive power: All 1,492,536 shares are held with shared voting power and shared dispositive power; sole voting and sole dispositive power are each reported as 0.
  • Triggering event date: The filing lists October 20, 2026 as the date of the event requiring this statement.
  • Certification language: The filing certifies that the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

Red Oak Partners and David Sandberg Report Combined 1,492,536-Share Position in Data I/O

According to the Schedule 13G filed on October 27, 2026, four reporting persons collectively disclosed their beneficial ownership of Data I/O Corp (CUSIP 237690102) common stock. Red Oak Partners, LLC, a Florida limited liability company, and David Sandberg, its controlling member, are each attributed 1,492,536 shares, equating to 11.2% of the outstanding class. The filing states that Red Oak Partners manages two private investment vehicles: The Red Oak Fund, LP and The Red Oak Long Fund, LP, both organized under Delaware law.

The filing explains that the aggregate 1,492,536 shares are held directly by the two funds. The Red Oak Fund, LP accounts for 971,737 shares, or 7.3% of the class, while The Red Oak Long Fund, LP accounts for 520,799 shares, or 3.9% of the class. According to the filing, David Sandberg, "as the managing member of Red Oak Partners may be deemed to beneficially own the 1,492,536 shares of common stock beneficially owned by Red Oak Partners through the Funds." Each reporting person disclaims beneficial ownership with respect to any shares other than those owned directly by that filer.

The filing reports zero sole voting power and zero sole dispositive power for all reporting persons. Shared voting power and shared dispositive power over the full 1,492,536 shares are attributed to both Red Oak Partners and David Sandberg. The address of record for the reporting persons is 980 N. Federal Hwy. Suite 110, Boca Raton, FL 33432. Data I/O Corp's principal executive offices are listed at 6645 185th Ave NE, Suite 100, Redmond, WA 98052.

What Was Disclosed

The Schedule 13G discloses that Red Oak Partners, LLC and David Sandberg beneficially own 1,492,536 shares (11.2%) of Data I/O Corp common stock as of October 20, 2026, held through The Red Oak Fund, LP and The Red Oak Long Fund, LP, with all ownership on a shared rather than sole basis.