Prince Harry assisted in breaking the world record for the biggest currency trade as he took the call to complete the deal on Monday.
Third in line to the throne, Harry, closed a foreign exchange deal worth 18 billion euros ($28.6 billion) at brokerage BGC Partners' charity day in London, Yahoo News reported.
The army helicopter pilot seemed a little puzzled as he chatted down the line to a trader from Barclays, using trading floor jargon.
Robert Sully, a broker on the foreign exchange desk who handed the telephone to the prince, described his performance as "brilliant," Yahoo News said.
"We told Harry to say '28 your choice', which means you can buy or sell," he said.
The planned trade did go through, it was described by the BGC trader as the biggest forward foreign exchange deal in history.
The previous record, set by Harry's older brother Prince William, was worth 17 billion euros and was completed at a different brokerage last December.
All revenues made during the charity day are donated to 29 good causes.
Celebrities including the Rolling Stones guitarist Ronnie Wood, London Mayor Boris Johnson and singer Sophie Ellis-Bextor joined Harry.
The BGC fundraising day is held in memory of staff from its sister company, investment bank Cantor Fitzgerald, who died in the September 11, 2001 attacks in New York.
Losing 658 employees, the firm was hit harder than any other organization.
