Positive Ympact SAS

About Positive Ympact SAS

Yseulys Costes is a French executive widely recognized in digital marketing and data-driven advertising. She is currently identified as the President of Positive YmpacT SAS, a company created in January 2022 and jointly controlled with Thibaut Munier within the founding shareholder structure of 1000mercis. She is best known as the co-founder of 1000mercis, a digital marketing group that became a benchmark player in France and abroad. Professional and institutional sources consistently describe her as a long-standing entrepreneur who has been directly involved in the group’s strategic development since its creation in 2000. Over the years, she held senior leadership roles at 1000mercis, including co-CEO responsibilities, and helped steer the company’s expansion in targeted advertising, CRM, data services and interactive marketing. Her academic background in management and marketing, together with an early interest in the internet dating back to the mid-1990s, helped shape a distinctive expertise at the crossroads of data, marketing performance and technological innovation. She also built sector visibility through public commentary on digital marketing, measurement and the business uses of data. Beyond 1000mercis, Costes has been associated with other corporate governance roles in the French business ecosystem, reinforcing her profile as an experienced board-level leader. In 2024, Positive YmpacT SAS, under her leadership and alongside Thibaut Munier, led the market operations aimed at regaining full control of 1000mercis, notably through a public withdrawal offer followed by a squeeze-out. That sequence highlighted her command of listed-company governance, shareholding strategy and complex capital markets processes. Overall, her career reflects a combination of entrepreneurial vision, operational discipline and sophisticated corporate transaction management, with recognized expertise in media, data and digital transformation.