Data I/O is trading 8.77% higher at $3.10 before the September 29, 2026 market open; the catalyst remains unclear. - The September 28 close was $2.85; recent closes show trading between $2.81 and $2.90 over the preceding seven sessions. - No company-specific announcement was listed for September 23–29; the latest release was the August 12 second-quarter results. - Supplied semiconductor sector context is negative and does not clearly explain the upward move.