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Yseulys Costes | CEO of Numberly

Interviewed by Irène Toporkoff

We welcome Yseulys Costes, CEO of Numberly for a raw conversation on the turning points in her life that got her to where she is now and what drives her to keep going.


Yseulys Costes, passionate about Digital Marketing, is the CEO of the group Numberly which she co-founded with Thibaut Munier in 2000. Now operating in over 40 countries through 8 branches, the Group, created in France under the name 1000mercis, is listed on Euronext-Alternext. The group’s growth and internationalisation gives life and meaning to its role as a Marketing Technologist: leveraging data to power marketing actions, relevant and targeted for consumers and more efficient and measurable for brands and distributors.

Yseulys Costes is an academic – she obtained a Marketing and Strategy degree from Paris Dauphine and was a visiting researcher at Harvard Business school. Thanks to this she keeps strong ties with the worlds of research and academia in France and in the United States. She is a member of the Board of Directors of Kering (CAC 40) and Groupe SEB (SBF 120) and a member of the Strategic Council of the City of Paris. In 2019, Forbes France named her among the 40 French “Forbes Women” who embody success and excellence. As the leader of a company that received a 96/100 rating on the Gender Parity Index, Yseulys advocates for diversity to be recognized as a factor for growth and competitiveness

We hope you enjoy our raw conversation with Yseulys. Editing and sound mixing of this episode was done by Clara Ernoult.