Market Jar

In short: Market Jar is a search marketing agency offering SEO, PPC and Web design and development, based in London. It has a team of 2–10 people.

Organic search and AI visibility growth partner for established businesses

Market Jar is a growth marketing partner with an office in London's Hanover Square and a second base in Laguna Beach, California. It positions itself around organic demand, helping established businesses attract better-fit customers through search and reputation rather than paid spend.

Its organic search work spans technical foundations such as site architecture, structured data, Core Web Vitals and crawl efficiency, along with content designed to build trust and an authority strand that uses digital PR, partnerships and brand mentions. The agency also works on visibility in AI-driven search, improvements to the on-site customer journey and expansion into international markets. Prospective clients can start with a paid Growth Blueprint before committing to ongoing work.

Market Jar deliberately keeps its client list small and prefers long-term relationships, with clients dealing directly with the founders. It was founded by James Nathan, and Mark Preston is a shareholder and Director of Growth. Its stated emphasis is on work that is commercially useful and factually accurate.