Bénédicte Coste is a graduate of the Ecole des hautes études commerciales (HEC – major in finance) and holds a degree in law.
She began her career in the finance division of Elf Aquitaine where she managed a portfolio in the Markets & Portfolio department from 1980 to 1984. In 1986, she started a portfolio management business first as an independent, then created Financière Lamartine SA, a portfolio management company, which obtained approval from the French market regulatory authority (COB) in 1990 (authorization No. GP 9063 on July 27, 1990). Financière Lamartine is specialized in discretionary management for private clients. She is a member of the Bank and Asset Management Group at the HEC Association. She was President of AFER, the French savings and retirement association, from April 2004 to November 2007.
In 2011, she graduated with a BTS in agricultural management from l’École supérieure d’agriculture d’Angers.