The source provides the following information about the methodology: "The WARC Effective 100 is a ranking of the world’s most awarded campaigns and companies for effectiveness. It compiles the results of award shows that ran the year prior to its publication (e.g. the 2026 rankings reflect the results of award shows that ran in 2025)."
There were *** agencies from the United Kingdom on the top 50 most creative agencies worldwide ranking in 2025. Ogilvy's London office ranked first, having been awarded points. The global ranking was topped by Publicis Conseil, owned by Publicis Worldwide, from Paris, with * points in 2024.
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WARC. (March 8, 2026). Most creative agencies in the United Kingdom in 2025 (index score) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 23, 2026, from /statistics/517735/top-creative-ad-agencies-in-the-uk/
WARC. "Most creative agencies in the United Kingdom in 2025 (index score)." Chart. March 8, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 23, 2026. /statistics/517735/top-creative-ad-agencies-in-the-uk/
WARC. (2026). Most creative agencies in the United Kingdom in 2025 (index score). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 23, 2026. /statistics/517735/top-creative-ad-agencies-in-the-uk/
WARC. "Most Creative Agencies in The United Kingdom in 2025 (Index Score)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 8 Mar 2026, /statistics/517735/top-creative-ad-agencies-in-the-uk/
WARC, Most creative agencies in the United Kingdom in 2025 (index score) ÌÇÐÄÆƽâ°æ, /statistics/517735/top-creative-ad-agencies-in-the-uk/ (last visited July 23, 2026)
Most creative agencies in the United Kingdom in 2025 (index score) [Graph], WARC, March 8, 2026. [Online]. Available: /statistics/517735/top-creative-ad-agencies-in-the-uk/
