Ryanair's boss Michael O'Leary said though that he hoped to see a recovery this year, forecasting profits to "at least double" thanks to anticipated lower fuel costs.

CNN: Ryanair posts $240M loss on high fuel costs

Garban's boss, Michael Spencer, believes that exchanges and brokers are in the same business: providing pools of liquidity.

ECONOMIST: Swap futures

Michael Duke, Walmart's boss, who led the international division during the controversial period, could also face scrutiny, as could Lee Scott, who was chief executive at the time.

ECONOMIST: Walmart