Hedge fund billionaire John Overdeck's divorce trial is underway in a New Jersey courthouse, with his estranged wife Laura Overdeck seeking 35% of his estimated $6.2 billion stake in quant-trading firm Two Sigma, totaling $2.17 billion. Overdeck has offered a $723 million settlement. The high-profile case could result in one of the largest divorce settlements ever and may influence an ongoing power struggle between Overdeck and co-founder David Siegel at Two Sigma.