Trio-Tech International reports ransomware at a Singapore subsidiary that escalated to data disclosure

Trio-Tech International, a semiconductor testing services and equipment company, disclosed on March 20, 2026 that a ransomware incident at its Singapore subsidiary had moved from encrypted files to disclosure of company data. The filing records how the company's own materiality view changed over a week.

Sequence in the filing

The first step was encryption on March 11. Management judged it not material at that point. Then, on March 18, data was disclosed. That development led management to conclude the incident may constitute a material cybersecurity event, and the Item 1.05 report followed two days later.

The subsidiary took its network offline, brought in outside specialists, notified police in Singapore and began notifying affected parties. Trio-Tech did not expect a material effect on results for the quarter ended March 31, 2026.

Unknowns

The filing does not describe what data was disclosed or where, and the scope of affected data was still being determined.