Jellyfish is a global digital marketing company that combines media, creative, data, and technology services for large brands. Founded in the United Kingdom in 2005 by Rob Pierre, it plans and buys media, produces creative, builds analytics, and trains client marketing teams, with a long-standing specialization in Google's advertising and analytics platforms.
Jellyfish grew from a small search marketing agency into one of the larger digital marketing groups, with thousands of employees across dozens of offices worldwide and clients such as Google, Netflix, and Nestlé. French holding company Fimalac bought a 50% stake in 2019, and in 2023 the business was acquired by The Brandtech Group, which pairs it with generative AI content tools such as Pencil. As of 2026, Jellyfish positions itself around AI-assisted marketing, including tools that track how brands are represented in large language models and that simulate media plan outcomes.