Arie Assayag, head of SG Asset Managements alternative investments business, left in April, taking 15 of Société Générales staff with him to set up a new hedge fund, Premium Asset Management, joining dozens of other bank employees that have this year left to join hedge funds or start up their own. Boaz Weinstein, Deutsche Banks co-head of global credit trading, announced his plans to leave the bank and set up a hedge fund with 35 Deutsche Bank staff back in January. The German banks quantitative trading group, Equitech, has also left to set up independent quant hedge fund Roc Group. Citadel, DE Shaw, Artradis and Tosca Fund are among many hedge...