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Top Series A companies in the United Kingdom

Companies that have closed a Series A - product-market fit confirmed and scaling. Filtered to companies headquartered in the United Kingdom.

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Built from a search like: Top Series A companies in the United Kingdom

Ranked by current headcount across Series A companies headquartered in the United Kingdom. Refreshed monthly.

  1. 1
    Asda· Leeds, England, United Kingdom

    It’s hard for anyone to imagine just how many different career possibilities there are at Asda. Ours is a big business, and beyond the roles you might be familiar with on the shop floor (or on your doorstep), there are hundreds of others you don’t get to see. In fact, because our business is changing so rapidly, there are new roles being created at Asda all the time. Technology is changing how we do things every day, helping us to reimagine retail to make life better for our customers, in-store and online. For those with imagination, can-do, integrity and a willingness to embrace change, the possibilities at Asda are limitless. Take a look around and see where a career at Asda could take you.

    • Series A
    • 52.8k employees
    • Founded 2024
  2. 2
    Sky· Isleworth, England, United Kingdom

    Sky connects and entertains millions of people across Europe. At the heart of everything we do, is a belief that people deserve better. For decades, we’ve shaken up every category we entered to give people what they love, to make life a little easier and to provide great value. That’s how we bring millions of customers the joy of a better experience in TV, broadband and mobile. In TV, we offer the best sports coverage, unmissable TV and the smartest ways to stream and aggregate the TV you love. In broadband, we power homes and businesses, with a fast, reliable connection. In mobile, we bring people closer, with plans at unbeatable value. And now, you can even keep your home connected and protected, through our smart insurance. We design our products to fit seamlessly into your life, with service whenever and however you need it. That’s how we do better for customers. And we believe in better for society too. We power the cultural economy in the UK and beyond, making award-winning news, original sport, and entertainment. We contribute billions to UK GDP, creating and sustaining thousands of jobs and sharing both our journalism and our coverage of the arts, free of charge. We are cutting emissions and making recyclable, energy-efficient products, and we give back, through free internet access and digital skills for under-served communities and young people. Sky is owned by Comcast Corporation, a global media and technology company.

    • Series A
    • 35.4k employees
    • Founded 1989
  3. 3
    Google DeepMind· London, England, United Kingdom

    We’re a team of scientists, engineers, machine learning experts and more, working together to advance the state of the art in artificial intelligence. We use our technologies for widespread public benefit and scientific discovery, and collaborate with others on critical challenges, ensuring safety and ethics are the highest priority.Our long term aim is to solve intelligence, developing more general and capable problem-solving systems, known as artificial general intelligence (AGI). Guided by safety and ethics, this invention could help society find answers to some of the world’s most pressing and fundamental scientific challenges. We have a track record of breakthroughs in fundamental AI research, published in journals like Nature, Science, and more.Our programs have learned to diagnose eye diseases as effectively as the world’s top doctors, to save 30% of the energy used to keep data centres cool, and to predict the complex 3D shapes of proteins - which could one day transform how drugs are invented.

    • Series A
    • 10.4k employees
    • Founded 2010
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  5. 4
    Zenith· London, England, United Kingdom

    Zenith is the ROI Agency. Our more than 6,000 specialists across 95 markets offer unparalleled capabilities in Media, Data, Technology, Commerce and Content. We put effectiveness at the heart of our work to solve complex challenges, drive successful business outcomes, and grow our clients’ businesses. Zenith is part of Publicis Media, the media arm of Publicis Groupe [Euronext Paris Fr0000130577, CAC40].

    • Series A
    • 5.4k employees
    • Founded 1988
  6. 5
    Mind· Stratford, England, United Kingdom

    We’re Mind, the mental health charity.We believe no one should have to face a mental health problem alone. We’re here for you. Today. Now. We’re on your doorstep, on the end of a phone or online. Whether you’re stressed, depressed or in crisis. We’ll listen, give you support and advice, and fight your corner. And we’ll push for a better deal and respect for everyone experiencing a mental health problem.Please note our LinkedIn page is moderated 10am-6pm Mon-Fri and is not a crisis support service. If you need urgent support for your mental health please contact NHS 111 or the Samaritans on 116 123. Mind's Infoline provides information and support to people experiencing a mental health problem and is open 9am-6pm Mon-Friday except Bank Holidays. The number is 0300 123 3393

    • Series A
    • 3.3k employees
    • Founded 1946

Find engineers at Series A companies in the United Kingdom

Series A companies in the United Kingdom are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in the United Kingdom by current headcount, drawn from public LinkedIn and Crunchbase records. With 1,029 matching companies in Refolk’s index, the density of senior engineers, designers, and founders is unusually high.

At Series A, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the the United Kingdom talent market is heating up - and for which engineers and founders are about to become tomorrow’s operators.

Refolk converts this list into a live search. Ask for “founders of Series A companies in the United Kingdom” or “senior engineers at Series A companies in the United Kingdom hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series A companies headquartered in the United Kingdom from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes monthly.

Last refreshed: Fri, 18 Sep 2026 07:55:12 GMT

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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.

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The underlying index updates continuously and this ranking is rebuilt monthly. Last refreshed: Fri, 18 Sep 2026 07:55:12 GMT. For a list built against the index as it stands today, sign up and run the search live.

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