Claire LEOST

About Claire LEOST

Claire Léost is a French media and publishing executive best known for becoming President of Prisma Media within the Vivendi group in September 2021. In Vivendi’s official communications, she was presented as the leader tasked with accelerating Prisma Media’s transformation, strengthening its market leadership, and helping drive innovation in a press industry undergoing rapid structural change. Her appointment fit into Vivendi’s broader strategic plan to reinforce its content, media, and communications businesses. Before joining Prisma Media, Léost had already built an approximately 20-year career in media, following an early stint in consulting at McKinsey from 2000 to 2003. She joined Lagardère Active in 2003, where she held editorial and then senior management roles. That background gave her deep experience in brand strategy, audience development, editorial transformation, and multi-platform growth. Vivendi highlighted her expertise, energy, and ability to make an impact as key assets for leading Prisma Media through a period of accelerated digital change. As head of Prisma Media, Léost operated in a highly demanding environment shaped by portfolio reshaping, strategic repositioning, and the need to adapt to changing reader and advertiser expectations. Her role involved preserving Prisma’s leadership in magazine publishing while strengthening synergies with Vivendi’s other businesses. Overall, her career reflects the profile of a media leader who combines content expertise, strategic rigor, and the ability to steer complex transformations in competitive and fast-evolving markets.