Following in the footsteps of her royal cousins William and Harry, who supported the cause last year, 26-year-old Beatrice joined a host of celebrities who turned traders for the day.
Before visiting BGC's Canary Wharf offices, Beatrice attended a memorial service for the Duchess of Cornwall's late brother Mark Shand, later revealing that her day at the company would help raise funds for his wildlife foundation.
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"Trading currency and electricity @BGCCharityDay for @elephantfamily," she wrote on Twitter. "Today we remember its founder Mark Shand."
Samuel L Jackson, Damian Lewis, Stephen Fry and Jonathan Ross were among the famous faces also using the event to help their chosen charities, as were Jennifer Saunders, Yasmin Le Bon, John Terry and Clive Owen.
"Can't wait to get on that trading floor @bgccharityday to raise money for @bdch #bgccharityday," tweeted Amanda Holden, who sported a Battersea Dogs and Cats Home sash throughout the day in honour of her cause. "I'm on my way!"
Mum-to-be Natalia Pinkham, who took part in BGC Charity Day in 2012, showed off her baby bump as she supported MND Association.
The Sky F1 presenter, who is a close friend of Beatrice and her cousin Zara Tindall, sported a grey, navy and magenta maternity dress as she took to the phones on the trading floor.
The BGC Charity Day marks the anniversary of the 9/11 attacks on the World Trade Centre 13 years ago.
The event is now annually held in memory of the 658 employees of BGC Partners who died as a result of the September 11 attacks and the revenue from the day's trade goes to the charities chosen by the company's celebrity guests.