OSE is a French organiser of outdoor sporting events, creating experiences in France and abroad since 2007. Its portfolio includes well-known races such as Salomon EcoTrail Paris, the Course Eiffage du Viaduc de Millau and the Verticale de la Tour Eiffel, alongside events focused on solidarity, health, climate and professional communities. Activities span running, trail, walking and golf, as well as digital challenges and hybrid or in-person formats.

OSE works with businesses, associations, foundations and local authorities to shape and deliver events around their goals and audiences. Its services include event design and organisation, digital event solutions and tailored corporate offerings. The team brings together expertise in planning and delivery, with an approach centred on mastery, creativity, emotion and performance.

OSE presents sport as a way to create memorable shared experiences and support collective initiatives. In 2025, the organisation reported 26 events, 100,000 runners and walkers, and €1.5 million collected for charitable organisations. Its work combines practical event management with attention to participant experience and client needs.