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Seed Cybersecurity companies in London

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

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

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

  1. 1
    Intruder· London, England, United Kingdom
    • Seed
    • 85 employees
    • Founded 2015
  2. 2
    SecureFlag· London, England, United Kingdom
    • Seed
    • 59 employees
    • Founded 2019
  3. 3
    SenseOn· London, England, United Kingdom
    • Seed
    • 56 employees
    • Founded 2017
  4. 4
    Goldilock Secure· London, England, United Kingdom
    • Seed
    • 45 employees
    • Founded 2020
  5. 5
    CloudSeals Technology· London, England, United Kingdom
    • Seed
    • 41 employees
    • Founded 2018
  6. 6
    SURF SECURITY· London, England, United Kingdom
    • Seed
    • 35 employees
    • Founded 2021
  7. 7
    Redflags.· London, England, United Kingdom
    • Seed
    • 28 employees
    • Founded 2016
  8. 8
    BLOCKAPT· London, England, United Kingdom
    • Seed
    • 18 employees
    • Founded 2019
  9. 9
    MIRACL | The login you love· London, England, United Kingdom
    • Seed
    • 17 employees
    • Founded 2011
  10. 10
    Falconfeeds.io· London, England, United Kingdom
    • Seed
    • 13 employees
    • Founded 2023
  11. 11
    OTIFYD· London, England, United Kingdom
    • Seed
    • 12 employees
    • Founded 2022
  12. 12
    ResilientX Security· London, England, United Kingdom
    • Seed
    • 12 employees
    • Founded 2022
  13. 13
    Meterian· London, England, United Kingdom
    • Seed
    • 11 employees
    • Founded 2018
  14. 14
    RevEng.AI· London, England, United Kingdom
    • Seed
    • 11 employees
    • Founded 2022
  15. 15
    Appsecco· London, England, United Kingdom
    • Seed
    • 7 employees
    • Founded 2015
  16. 16
    Cyscale· London, England, United Kingdom
    • Seed
    • 5 employees
    • Founded 2019
  17. 17
    DOCGuard· Aldie, Virginia, United States
    • Seed
    • 4 employees
    • Founded 2022
  18. 18
    Hoplon AI· London, England, United Kingdom
    • Seed
    • 4 employees
    • Founded 2024

Find engineers at Seed Cybersecurity companies in London

Searching for “engineers at top Seed Cybersecurity companies in London” surfaces this slice of the market. The list above ranks Cybersecurity companies headquartered in London whose latest disclosed round is Seed, by current headcount, drawn from public LinkedIn and Crunchbase records. With 18 matching companies in our 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 — Seed, 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 Seed Cybersecurity companies in London hiring” or “founders of Seed 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 Seed 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: Thu, 07 May 2026 08:03:40 GMT

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