41M Reasons: Carrefour’s Omnichannel Transformation for EOY Success | Havas Media & Carrefour (Belgium)

Carrefour's omnichannel transformation, driven by 1st party data, revolutionized its approach to targeting customers during the critical year-end (EOY) period. By integrating customer data from sales records, loyalty programs, and both in-store and online behaviors, Carrefour built a comprehensive understanding of its customer base. This enabled dynamic segmentation and real-time optimization across multiple touchpoints, including Hypermarkets, Supermarkets, and eCommerce platforms. Leveraging advanced audience segmentation and geolocation targeting, Carrefour was able to deliver personalized, high-impact campaigns that captured incremental sales, optimized media spend, and reinforced its leadership in the competitive Belgian market. The result was a 32% sales uplift and a 3% increase in market share, showcasing the power of first-party data in shaping successful, data-driven marketing strategies.