Photos from the event:
Actor Sean Bean was on the trading floor to raise money for Sohana Research Fund, which helps people who have the incurable genetic skin condition recessive dystrophic epidermolysis bullosa.
He said: "It's something I've become quite close to over the years."
Asked about what the atmosphere was like at the charity event, he said: "It's quite informal. It's quite relaxed - a bit mad. I don't know what I'm doing but I think I'm raising money. It's quite an insight into an aspect of the financial world, and I don't make it out at all."