(Bloomberg) -- Commodity trader Olam Group said that its investigation found no evidence to support allegations of a reported scandal at its Nigerian units, spurring a surge in its Singapore-listed shares.Most Read from BloombergTrump Keeps NY Empire Intact as Judge Rescinds Asset-Sale OrderRecord US Stock Rally Is Under Threat From a World in TurmoilChina Stocks Primed for Bullish Reopen After Upbeat DataWall Street’s Moelis Bet Big on the Middle East. Now He’s Cashing InSystemic Risk Concerns