4. WWT

GII: £1.45bn

UK employees: 226

WWT may still get tagged as a value-added reseller, but don’t say that to CEO Jim Kavanaugh unless you fancy a long (and probably quite persuasive) conversation. The Missouri-headquartered firm sees itself as a full-blown global systems integrator – and increasingly, an AI powerhouse.

In the UK, WWT is plotting sustained growth off the back of its new 100,000-square-foot integration centre in Coventry. The facility complements its long-standing London sales and engineering hub and is designed to cut customs friction and speed up delivery post-Brexit. It is also a sign of how serious WWT is about deepening ties with local enterprise giants – 15 to 20 of them, by VP of global accounts Dominic Pierce’s count.

AI is the common thread in many of WWT’s growth ambitions, and nowhere is that clearer than in its work with Nebraska-based colocation provider Scott Data Center. After spending just eight hours in WWT’s AI labs, Scott DC’s CEO called in the firm to design, build and launch a cloud-based GPU-as-a-Service platform, featuring 816 Nvidia H100s and a custom IT stack. Deviating from Nvidia’s reference architecture didn’t faze WWT – it rolled up its sleeves and delivered a high-performance, highly profitable solution anyway.

That’s emblematic of how WWT sees its place in the AI era: part consultancy, part integrator, and fully invested. The company is spending $500m globally to supercharge its AI capabilities – from its Advanced Technology Center to internal GenAI tools – all while eschewing private equity money.

As for that VAR label, Pierce recently told CRN: “If you spoke to our CEO, Jim Kavanaugh, he would very much disagree with you.

“We have that capability, but we are a global technology integrator with strong consulting expertise.

“Our competition at one end can be Deloitte and Accenture, it could be some niche consultancies in the genAI game and the cybersecurity world, and it absolutely could be some of the more traditional value-added resellers.

With more than £1.4bn in UK revenue and a headcount of over 250, WWT partners with the likes of Cisco, Dell, Pure Storage and HP, and is on the hunt for acquisition targets that can help it deepen capabilities here or crack new markets on the continent.

For 2025, progress in GenAI and on-prem AI deployments will be its UK scorecard. And on current form, it looks set to keep racking up the wins.