I dont subscribe to the black swan theory of the possibility of all my positions blowing up at the same time. I have normally 10-15 open positions, with a total captial exposure of between £400k and a maximum of £1.5m If they all went to zero overnight then I would be in a total mess. but the postions are over a number of different markets, different industries, different sectors. i've been doing this for a long time, so whilst my risk management probably wouldnt suit most people, it works for me..