The Duke of Cambridge and his younger brother Prince Harry tried their hand at stockbroking on Wednesday (Sept 11) at the BGC Partners trading floor in London's Canary Wharf.
The two royals made multi-billion deals at the BGC Charity Day which is held each year to commemorate the 658 employees of the company's affiliate, Cantor Fitzgerald, who lost their lives in the 9/11 attacks on the World Trade Centre.
The brothers joked with one another as they fielded calls while traders shouted advice. The Duke of Cambridge admitted to one dealer he spoke to that the trade was "so complicated that he had to write it down," before going on to close the deal, prompting the prince to joke "that was easy!"
Proceeds from the money raised will be donated to dozens of charities worldwide, including two of the charities that are supported by the princes.
Wellchild, is a charity for sick children that recognises inspirational youngsters. Some of the award winners, recognised for their courage, were invited to meet the charity's patron, Prince Harry.
The Duke of Cambridge chatted to people who have benefited from courses run by the charity Skill Force, which utilises the experience of former members of the armed forces to deliver life skill programmes for disadvantaged young people.
Since its inaugural event nine years ago, BGC's Charity Day has raised around £51 million globally.
Presented by Adam Justice