Ultratop 40 Singles is the official weekly chart that ranks the best-selling singles in Wallonia, the French-speaking region of Belgium. Compiled and published by the Ultratop organization, the Ultratop 40 presents a regularly updated snapshot of popular singles in the Walloon market and complements the Ultratop 50 chart published for Flanders. The chart is widely cited by music industry professionals, radio programmers and the general public as an indicator of a song's commercial success in the region.

Scope and characteristics

The Ultratop 40 covers sales activity in Wallonia and reflects the tastes of that particular market. It is sometimes referred to simply as "Ultratop 40" and is distinguished from the separate Flemish chart, the Ultratop 50, which serves the Flanders region. The chart focuses on measurable transactions and is intended to be objective and reproducible.

Methodology and publication

The chart is compiled from aggregated sales data collected from retail outlets and legal digital downloads. Historically, Ultratop sourced point-of-sale data from around 500 physical and online retailers to generate weekly rankings. A market-observer firm (noted in public summaries) performs the data collection and verification. Over time the compilation methods have been adapted to reflect changes in music consumption while maintaining a focus on verifiable sales transactions.

Broadcasts, audience and reference works

The Ultratop 40 is aired on radio and often highlighted on television music shows. One of its regular radio broadcasts has been the Saturday program on Radio Contact, airing around midday. Across the various radio and TV outlets that present Ultratop charts, the combined weekly audience numbers have been reported to exceed two million listeners and viewers. To mark milestones in the chart's history, Ultratop has produced retrospective publications: for example, a jubilee book published for the chart's 10th anniversary documented thousands of entries and artists tracked by the service to that date.

Historical and practical importance

Since its introduction, the Ultratop 40 has served as a commercial barometer for success in Wallonia. Record labels, radio stations, streaming services and artists use the chart to assess market performance, program playlists and plan promotions. The existence of separate charts for Wallonia and Flanders reflects Belgium's linguistic and cultural regions and acknowledges differing market dynamics across the country.

While Ultratop shares structural similarities with other national charts—relying on observable sales data rather than editorial judgment—it also adapts to the evolving industry landscape. For readers seeking the current published listings and further methodological notes, consult Ultratop's official materials and participating broadcasters for the latest details and any recent methodological updates.