A global-macro startup with a China-centric view is set to start trading a sizeable sum of outside capital at the end of the second quarter.Hong Kong-based PrideRock Global Investment, led by one-time Goldman Sachs executive Jun Yuan, began trading in January with internal capital and went on to post a 16.5% gain as of March 31. The plan is to have at least $100 million on hand when the operation begins investing for clients.PrideRock...