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Onion Security Ltd

Onion Security Ltd is a London-based information security consultancy with 20 years of experience in cybersecurity for financial services.

Computer and Network Security
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Headquarters
London, United KingdomSource: RevenueBaseRetrieved October 13, 2026
Employee range
1 to 10Source: RevenueBaseRetrieved October 13, 2026
Founded
2024Source: RevenueBaseRetrieved October 13, 2026
Published list appearances
8 supported appearances ↗Source: RevenueBase lists
The company at a glance

What does Onion Security Ltd do?

It supports continuous compliance with ISO 27001, SOC 2, GDPR, and other regulatory frameworks.

Based on the company’s public LinkedIn information, supplied through RevenueBase.

Who it serves

The consultancy supports UK fintechs and investment firms with continuous compliance.

What the business offers

Services & capabilities.

Compliance and Vanta implementation

Its listed services include ISO 27001 and SOC 2 compliance, Vanta implementation, and Trust Centre setup.

Source: LinkedIn company description · Retrieved October 13, 2026

Explore the business in context

Company lists.

Supported appearances on published RevenueBase lists, including available memberships beyond displayed rankings.

Positions describe ordering within each source list. See how lists are built ↗

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BADGE PREVIEWOnion Security Ltd listed #10 on Soc 2 compliance consulting firms, September 28, 2026Open the published source list.
Onion Security Ltd

#10 Soc 2 compliance consulting firms

Snapshot: September 28, 2026

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Company information

Sources & data notes.

RevenueBase prepared this profile from the company’s public LinkedIn information and RevenueBase company data. These source records were retrieved on October 13, 2026. AI helped summarize these sources, with a separate automated check against the source text completed on November 3, 2026. Directory positions use company-contact counts from separate saved list snapshots dated September 12, 2026, September 19, 2026, September 27, 2026 and September 28, 2026. How the company lists are built.

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