The stock market manipulation was masterminded by John Soh Chee Wen and his girlfriend Quah Su-Ling. PHOTOS: LIANHE ZAOBAO, KEVIN LIM

SINGAPORE - Malaysian businessman John Soh Chee Wen and his girlfriend Quah Su-Ling were convicted as masterminds of Singapore's most serious case of market manipulation that wiped out more than $8 billion from the Singapore stock market in October 2013, the High Court ruled on Thursday afternoon (May 5).