Underground Ecom
The Leading Klaviyo Agency for Global Ecommerce — Named Klaviyo Agency Partner of the Year EMEA 2025
About Underground Ecom
Underground Ecom is one of the world's most recognised email marketing agencies, with clients spanning the US, UK, Europe, and beyond. Headquartered in Farringdon, Central London, they've built a team of 150+ retention marketers across 25 languages — a deliberately global talent pool assembled to serve ecommerce brands at every scale, from fast-growing DTC startups to established 9 and 10-figure brands. Their sole focus is retention marketing. No paid media. No SEO. No generalist services. Just Klaviyo, done at a level that few agencies anywhere in the world can match. CEO Jamie Watkins put it plainly: "Our mission has always been to push the boundaries of retention strategy and help ecommerce brands unlock their full potential through CRM." Underground Ecom was officially named Klaviyo's Agency Partner of the Year EMEA 2025 at K:BOS 2025 — Klaviyo's flagship global event in Boston — with the award presented by Klaviyo's own CEO and Co-Founder, Andrew Bialecki. Read more about the award here: https://www.undergroundecom.com/klaviyo-agency-of-the-year-emea/ It is the highest recognition Klaviyo awards to a partner agency across the entire EMEA region. Whether you're a US brand looking to scale internationally, or a UK and European brand wanting to dominate your home market, Underground Ecom brings the same world-class retention expertise — and the results to prove it.
Services
Results & Case Studies
Underground Ecom's track record speaks for itself. Across their client base — which spans the UK, Europe, and the US — they've delivered: • $9,000,000 in email marketing revenue generated for Rose Skin Co • 287% increase in total revenue for SeoulBox • 37% of all online revenue driven through email for Egard Watch Company For many of their clients, Klaviyo contributes between 30–50% of total online revenue — a figure most brands don't reach without the right agency partner behind them. They're rated 5 stars on Trustpilot by hundreds of ecommerce brands across the UK and Europe, and are consistently booked to near-capacity — the clearest indicator of genuine demand. See their full story at https://www.undergroundecom.com/
What clients say
“Underground Ecom transformed our email channel. They went from 18% to 42% of total revenue attributed to Klaviyo within 90 days. Exceptional team, exceptional results.”
“We interviewed five agencies before choosing Underground Ecom. Their depth of Klaviyo knowledge is unmatched — and the results backed it up from day one.”
“If you are a UK or European brand serious about retention, there is no better Klaviyo partner. The Award of the Year EMEA 2025 says it all.”
The Team
Underground Ecom operates from 103 Farringdon Road, London EC1R 3BS — right in the heart of Central London. With 150+ specialists across 25 languages, their team is structured to serve ecommerce brands operating across multiple European markets, not just the UK. 🌐 Website: https://www.undergroundecom.com/ 🏆 Klaviyo Award: https://www.undergroundecom.com/klaviyo-agency-of-the-year-emea/ 📅 Book a strategy call: https://undergroundecom.typeform.com/booking
Ready to work with Underground Ecom?
Visit their website or book a strategy call to get started.