The thegentlemen ransomware group listed Probe Test System on its data leak site on 2026-08-30. Country: TW Sector: Technology Domains named: ptse.com.tw Claim as published on the leak site: ptse.com.tw Probe Test System Corp. (PTS, 群雅電子) is a Taiwanese semiconductor back-end (OSAT) service provider operating since 2000, with plants in Zhunan and Toufen, Miaoli County (the former Hsinchu site was consolidated into Toufen in Q1 2024). Its services cover System Level Test (SLT), wafer chip probing (CP) on Chroma, ASL1000 and CTA8280 platforms, IC marking/remarking, Tape & Reel packaging (capacity ~150 KK units/month) plus lead/ball scan inspection. Long-term customers include Taiwan's leading chipmakers: Winbond, MediaTek, Novatek, Nuvoton and Macronix. The company is certified under ISO 9001, ISO 14001 and ANSI/ESD S20.20-2021.