Yseulys Costes founded 1000mercis SA. Presently, she is Chairman & Co-Chief Executive Officer at this company and Chairman-Supervisory Board of Ocito SA (a subsidiary of 1000mercis SA). Ms. Costes is also on the board of Kering SA and SEB SA and Member-Strategy Board at City of Paris and Member of Conseil pour la Diffusion de la Culture Économique.

She previously held the position of Member of Conseil des Entreprises et Groupements de l'Economie Sociale.

Ms. Costes received a graduate degree from Université Paris Dauphine-PSL, an undergraduate degree from Université Paris 1 Panthéon-Sorbonne and an MBA from Anderson School of Management.