Belgian prosecutors say they arrested a Belgian-Chinese man in May on suspicion of stealing secrets from bankrupt gallium nitride semiconductor maker Belgan (Andy Bounds/Financial Times)

Belgian prosecutors arrested a Belgian-Chinese man in May on suspicion of stealing trade secrets from the bankrupt gallium nitride semiconductor company Belgan. Prosecutors say the suspect joined a Chinese tech firm months after leaving Belgan and that evidence indicates he accessed proprietary information. The case follows Belgan’s collapse and highlights concerns over intellectual-property theft in the semiconductor sector.