Yseulys Costes founded 1000mercis SA. Currently, Ms. Costes is Chairman & Chief Executive Officer at this company.

She is also on the board of Kering SA, SEB SA and Ocito SA (former Chairman-Supervisory Board) and Member of Conseil pour la Diffusion de la Culture Économique.

In the past she occupied the position of Member of Conseil des Entreprises et Groupements de l'Economie Sociale.

She received a graduate degree from Université Paris Dauphine, an undergraduate degree from Université Paris 1 and an MBA from Anderson School of Management.