Yes, John Soh (full name Soh Chee Wen) was held in remand—effectively jailed—prior to his conviction by the Singapore High Court. He was remanded starting in November 2016 after being charged on November 25, 2016, for market manipulation and related offenses tied to the 2013 S$8 billion penny stock crash. His trial lasted nearly 200 days, leading to conviction on 180 charges on May 5, 2022, followed by a 36-year sentence on December 28, 2022 (with a stay pending appeal). In contrast, his co-accused Quah Su-Ling remained on S$4 million bail during this period. This pre-trial detention is standard in Singapore for serious cases where flight risk or evidence tampering is a concern, as seen in reports from the Monetary Authority of Singapore, Singapore Police Force, and outlets like TODAY and The Straits Times.