Prince William and Harry swapped royal uniforms for Wall Street suits Wednesday as they acted as stock traders in a charity event that remembers victims of 9/11.

The royal brothers, assisted by professional traders, brokered deals in the billions of euros for a function put on by BGC Partners The Washington Post said. The financial company hosts a charity day every year to raise money in honor of the 658 employees lost during the Sept. 11th attacks on the World Trade Center.

William and Harry injected some humor into the somber event by jabbing at each other and playing around with the BGC traders.

Harry jokingly blamed his brother for engaging in too much “baby talk” rather than financial deals, The Telegraph reported. The Duke of Cambridge is a new father to two-month-old Prince George.

Harry continued to poke fun at his older brother during their hour long shift. While William negotiated with a female broker, Prince Harry quipped, “Stop flirting, get on with it.”

Amid their playful banter, the royal pair broke BGC’s record for a forward foreign exchange trade with a 25 billion euro agreement. Despite his success as a trade broker, William confessed: “I’m much better at helicopters.”

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