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Convertible-note Cybersecurity companies in London

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

Built from a search like: “Top Convertible-note Cybersecurity companies in London”

Ranked by current headcount across Convertible-note Cybersecurity companies in London. Refreshed daily.

  1. 1
    COFENSE· Ashburn, Virginia, United States
    • Debt
    • 291 employees
    • Founded 2011
  2. 2
    Encode· London, England, United Kingdom
    • Debt
    • 46 employees
    • Founded 2010
  3. 3
    Crypta Labs· Greater London, England, United Kingdom
    • Debt
    • 11 employees
    • Founded 2014
  4. 4
    Quantum Resistant Cryptography (QRC)· London, England, United Kingdom
    • Debt
    • 7 employees
    • Founded 2019

Find engineers at Convertible-note Cybersecurity companies in London

Searching for “engineers at top Convertible-note Cybersecurity companies in London” surfaces this slice of the market. The list above ranks Cybersecurity companies headquartered in London whose latest disclosed round is Convertible-note, by current headcount, drawn from public LinkedIn and Crunchbase records. With 4 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 — Convertible-note, 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 Convertible-note Cybersecurity companies in London hiring” or “founders of Convertible-note 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 Convertible-note 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 07:52:29 GMT

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