Top companies in the United Kingdom
Europe's biggest tech market, with London the centre of gravity.
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Ranked by current headcount across companies headquartered in the United Kingdom. Refreshed monthly.
- 1EY· London, England, United Kingdom
EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.Enabled by data, AI and advanced technology, EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.EY teams in more than 150 countries work across a full spectrum of services in assurance, consulting, tax, strategy and transactions, strengthened by sector experience and diverse ecosystem partners. Find out more about the EY global network: http://ey.com/en_gl/legal-statement
- 408.9k employees
- Founded 1989
- 2PwC· London, England, United Kingdom
At PwC, we help clients drive their companies to the leading edge. We’re a tech-forward, people-empowered network with more than 370,000 people in 149 countries. Across audit and assurance, tax and legal, deals and consulting we help build, accelerate and sustain momentum. Find out more at www.pwc.com.PwC: Audit and assurance, consulting and tax servicesPwC refers to the PwC network and/or one or more of its member firms, each of which is a separate legal entity. Content on this page has been prepared for general information only and is not intended to be relied upon as accounting, tax or professional advice. Please reach out to your advisors for specific advice.
- Grant
- 297.9k employees
- Founded 1998
- 3NHS· United Kingdom
The NHS was launched in 1948.
- 255.9k employees
- Founded 1948
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- Series-A companies in the United KingdomRun
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- 4UK Civil Service· London Colney, England, United Kingdom
The UK Civil Service implements the policy of the Government of the day and delivers crucial public services.
- 239.9k employees
- 5Shell· London, England, United Kingdom
Shell is a global group of energy and petrochemical companies, employing 96,000 people across 70+ countries. We serve around 1 million commercial and industrial customers, and around 33 million customers daily at our Shell-branded retail service stations.Our purpose is to power progress together by working with each other, our customers and our partners. #PoweringProgress
- Grant
- 219.4k employees
- Founded 1907
Find engineers and operators at companies in the United Kingdom
the United Kingdom is one of the densest markets for technology talent in the world. The list above ranks the largest companies headquartered in the United Kingdom by current headcount, drawn from public LinkedIn and Crunchbase records. With 99,965 matching companies in Refolk’s index, the depth of engineers, designers, product managers, and founders is broad across stages and industries.
Hiring in the United Kingdom usually means hiring out of these companies. The biggest names anchor the talent pool - every senior engineer in the United Kingdom likely has at least one of them on their resume - and the fast-growing ones generate the most movement.
Refolk lets you reach into this pool with plain English. Ask for “senior backend engineers in the United Kingdom who’ve shipped at scale” or “founders in the United Kingdom who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.
How this list is built
Last refreshed: Fri, 18 Sep 2026 07:48:53 GMT
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- Series-A companies in the United KingdomRun
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Common questions
How is this ranking built?
The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.
How fresh is the data?
The underlying index updates continuously and this ranking is rebuilt monthly. Last refreshed: Fri, 18 Sep 2026 07:48:53 GMT. For a list built against the index as it stands today, sign up and run the search live.
Can I get the full list of 99,965 companies?
Yes. This page shows the top of the ranking; sign up and I'll run the search live for the complete, current list. You start with 500 free credits, no card required.
Can I find the people inside these companies?
Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.
Try it on the search you came here for
Stop building boolean strings. Just describe the person.
Type one sentence. I plan the search, read GitHub, public LinkedIn and Crunchbase records, and the open web as it is right now, and hand back a ranked list with the reason next to every name.
01Describe them
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02I read the web live
GitHub, public LinkedIn and Crunchbase records, the open web. Not a database that went stale last quarter.
03You read the shortlist
Ranked, with the reasoning under every name. Open a profile, ask a follow-up, narrow it down.
- Staff backend engineers in NYC who shipped Rust in production
- Series A fintechs in SF under 50 people, growing headcount this year
- Maintainers of fast-growing Rust web frameworks on GitHub
- No boolean, no filters, no seat to buy. One box.
- Read at search time, so a profile updated yesterday counts today.
- Every step visible as it runs, every name with its reason.
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