He worked as a financial trader in Hong Kong and the City of London from 1997 to 2007, for Société Générale and Crédit Agricole.

He was put in charge of credit markets in South East Asia for Société Générale, remaining there until 2000.

He developed a company called Asiabooster to help European start-ups in the continent, but it fell to the Dot-com bubble.

Four months later, with the company now known as Calyon after its merger with Crédit Lyonnais, one of Féry's subordinates lost €200 million on the New York stock exchange.

[4] The Nice offer in 2001 was with a Korean business partner, and was rejected for lack of transparency, while the president of Nîmes changed his mind as his club was promoted to Ligue 2, and Wednesday was considered too expensive and risky for Féry.

[4] In July 2023, he received attention for signing 2018 FIFA World Cup winner Benjamin Mendy days after the player was acquitted of sexual offences in England.

[11][12] According to French business magazine Challenges, Féry was France's 398th richest person in 2023, with a net worth of €320 million.