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Series B Cybersecurity companies in London

Companies defending or attacking software, networks, and cloud infrastructure. Filtered to Series B-stage companies headquartered in London.

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Built from a search like: “Top Series B Cybersecurity companies in London”

Ranked by current headcount across Series B Cybersecurity companies in London. Refreshed daily.

  1. 1
    Risk Ledger· London, England, United Kingdom

    Risk Ledger is a pioneering third-party risk management platform that revolutionises supply chain security through a powerful, unified solution. By onboarding and connecting your entire supply chain into an active network, Risk Ledger provides real-time insights to identify concentration risks and emerging threats. Our dynamic network-based model offers a clear view of your entire supply chain, enhancing your ability to visualise and manage risks effectively. With immediate access to a vast, trusted supplier network and continuously updated risk assessments, Risk Ledger streamlines risk management processes, reduces manual workload, and empowers you with unparalleled clarity and control across all supply chain tiers.Risk Ledger provides all the tools you need to run a comprehensive, security-led, third-party risk management programme against your supply chain.The platform moves away from point-in-time assessments by providing you with real-time, actionable data collected directly from suppliers - allowing you to continuously identify, measure and manage a comprehensive set of third-party risks at speed and at scale for a low, per-supplier cost.Our unique network model gives you visibility of supply chain risks beyond third parties to fourth and fifth parties too.Contact us to find out how we can help you to manage risks in your supply chain and follow us on LinkedIn for relevant news and announcements.

    • Series B
    • 91 employees
    • Founded 2018
  2. 2
    CyberSmart· London, England, United Kingdom

    Stop cyber attacks dead in their tracks with CyberSmart: an all-in-one cybersecurity monitoring, optimisation, training and insurance platform proven to defend against the unexpected.#BeCyberSmart with #CompleteCyberConfidence

    • Series B
    • 75 employees
    • Founded 2016
  3. 3
    Cado Security (acquired by Darktrace)· London, England, United Kingdom

    Darktrace has acquired Cado Security, a cyber investigation and response solution provider and leader in cloud data capture and forensics. With this acquisition, Darktrace now provides automated, in-depth data collection – maintaining resilience in a fast-evolving threat landscape.

    • Series B
    • 15 employees
    • Founded 2020

Find engineers at Series B Cybersecurity companies in London

Searching for “engineers at top Series B Cybersecurity companies in London” surfaces this slice of the market. The list above ranks Cybersecurity companies headquartered in London whose latest disclosed round is Series B, by current headcount, drawn from public LinkedIn and Crunchbase records. With 3 matching companies in Refolk’s index, this is a tight read on where the Cybersecurity talent in London is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Series B, Cybersecurity, in London - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Cybersecurity’s next operators and angel investors.

Refolk converts this list into a live search. Ask for “senior engineers at Series B Cybersecurity companies in London hiring” or “founders of Series B Cybersecurity companies in London who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled Cybersecurity companies headquartered in London whose latest disclosed funding round is Series B from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 14:39:43 GMT

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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 page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 14:39:43 GMT.

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