Yong was founding partner and CIO of Abax Global Capital, a hedge fund based in Hong Kong that was part-owned by Morgan Stanley.

He previously was a managing director at Citadel LLC and Head of Trading for South East Asian FX and Derivatives at Goldman Sachs.

[3][4] In August 2008, the Tudor Investment Corporation provided US$123 million of seed funding to Dymon Asia.

[3] In May 2014, Temasek Holdings invested US$500 million in Dymon Asia and also took a minority stake in the company.

[13] In 2020, Dymon Asia Ventures was spun-off as a separate company to form Integra Partners.