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London hosts thousands of cyber security providers, from boutique consultancies to global vendors, and picking the wrong one is expensive. This guide compares ten companies with genuine London delivery capability across penetration testing, managed security, compliance, and OT security, checked against current services, credentials, and verified customer feedback, so you can build a shortlist you can actually defend.
Before you shortlist a provider, here's what matters most when comparing cyber security companies in London.
Use these five points as a starting filter, then work through the fuller comparison below before you contact anyone.
The scale of that market keeps growing. The UK government's 2026 Cyber Security Sectoral Analysis found 2,603 firms now active in the UK cyber security products and services market, a 20% jump from the 2,165 identified the year before, with sector revenue reaching £14.7 billion. For a London buyer, that growth is good news and a genuine complication in equal measure. You see, more choice also means more noise to filter through before you find a provider who actually fits your risk profile.
Recent events have made the stakes harder to ignore. In April 2025, Marks & Spencer, one of the UK's best-known retailers, disclosed a ransomware attack that began when attackers social-engineered a third-party IT helpdesk contractor into resetting the credentials of a privileged account. The incident took online ordering offline for weeks, exposed customer personal data, and cost the business an estimated £300 million in profit, a reminder that even organisations with mature security programmes stay exposed through their suppliers and support desks.
This guide compares ten cyber security companies with a genuine presence serving London organisations, covering what each one does best, their credentials, and where to look further before you commit.
Weigh these against each other rather than treating any single one as a dealbreaker on its own, since the right provider usually wins on balance rather than a perfect score across the board.
| Company | Best For | London Presence | Core Services | Notable Credentials |
| Microminder Cyber Security | Combined pen testing, managed security, compliance, and OT security | UK office in Stanmore, Greater London | Penetration testing, MDR, SOCaaS, compliance, OT security | CREST, ISO 27001, ISO 9001 |
| First Response | Digital forensics and cyber incident response | Genuinely London-based | Incident response, digital forensics, managed SOC | Specialist forensics and IR practice |
| ITC Secure | Advisory-led MDR built on Microsoft security tooling | London headquarters | Consulting, MDR, CISO advisory, cloud security | Microsoft Security Advanced Specialisations |
| S-RM | Cyber consultancy paired with corporate intelligence and investigations | London headquarters | Cyber advisory, digital forensics, incident response, offensive security | CREST |
| Redscan, A Kroll Business | CREST-accredited MDR and pen testing at enterprise scale | London office, London Bridge | MDR, penetration testing, red teaming, incident response | CREST (pen testing, SOC, CSIR), ISO 27001 |
| Urban Network | SMEs wanting IT support bundled with cyber security basics | London-based MSP | Managed IT, Cyber Essentials Plus, cloud and cyber security | Cyber Essentials Plus, IASME certification body |
| Crossword Cybersecurity | Research-driven risk, supply chain, and threat detection tools | London headquarters, AIM-listed | Cyber strategy and risk, supply chain security, threat detection | Works with UK university research partners |
| Sophos | Large enterprises wanting proven endpoint and MDR technology | UK-headquartered in Abingdon; not London-based | Endpoint protection, MDR, firewalls, cloud security | Long-standing UK cybersecurity vendor |
| Fortinet | Network security infrastructure from a global vendor with a real London base | Dedicated London office, Moorgate | Firewalls, SD-WAN, network security | Established global vendor with an EMEA hub |
| Akamai | CDN-integrated security and DDoS protection at scale | London office in Soho since 2016 | DDoS protection, web app and API security, CDN security | Established global vendor with a long-standing UK presence |
Treat this table as a starting filter rather than a final answer, since the right fit still depends on your sector, budget, and how much you want delivered in-house versus managed.
Microminder is a cyber security firm offering penetration testing, managed security, cyber risk, compliance, and OT security under one roof, with operations spanning the UK, UAE, and Saudi Arabia. The company positions itself around outcome-based delivery rather than one-off testing, which suits organisations that want a single provider to carry a security programme forward over time.
Best for: London organisations wanting one provider across penetration testing, managed security, cyber risk, compliance, and OT security rather than juggling several specialist vendors.
London presence: UK office at Stanmore Business and Innovation Centre, Howard Road, Stanmore, Greater London, alongside headquarters operations in the UAE and Saudi Arabia.
Core services:
Microminder's penetration testing and cloud testing teams hold CREST accreditation, and the company operates under ISO 27001 certification for information security management, alongside ISO 9001. That breadth means a client can run a penetration test, act on the findings through compliance consulting, and set up an incident response retainer without switching providers midway through a programme.
What customers mention: Reviews on Trustpilot reference strong delivery on OT security engagements across multiple sites, with clients noting responsive, outcome-focused project management. As with any provider, check the current rating and read individual reviews before you rely on them, since scores and review counts shift over time.
Considerations: Because Microminder covers a wide service range, ask for a detailed scope document upfront so you understand exactly what's project-based versus what's delivered as an ongoing managed engagement.
Book a free consultation with a Microminder cyber security expert to talk through where your organisation's exposure sits today.
UK: +44 (0)20 3336 7200
KSA: +966 1351 81844
UAE: +971 454 01252
First Response is a specialist cyber incident response and digital forensics company genuinely based in London, working with banks, law firms, energy and manufacturing firms, and public sector bodies where confidentiality and evidential integrity matter as much as speed. The firm built its reputation on handling breaches after they happen rather than on preventative testing.
Best for: Organisations that need specialist digital forensics or cyber incident response rather than a full-service security programme.
London presence: Genuinely London-based, with the team operating from the capital while serving clients internationally.
Core services:
First Response's case studies describe work with a 700-user financial services firm on a business email compromise investigation, alongside broader ransomware recovery engagements handled on a weekly basis, which points to a team used to working under pressure rather than only in scoped testing windows.
What customers mention: Public case studies emphasise structured incident handling and clear post-incident reporting, though independent third-party review data was limited at the time of research and should be checked directly before publication.
Considerations: First Response focuses on incident response and forensics rather than broad managed security or compliance consulting, so pair it with another provider if you need ongoing monitoring alongside breach response. If you're weighing that decision, our guide to incident response retainers explains how the two roles typically split.
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ITC Secure is a London-headquartered, advisory-led cyber security firm with more than 25 years of history and a client base of over 300 blue-chip organisations. The company has built its recent growth around Microsoft security tooling, holding advanced specialisations in cloud security and threat protection as a Microsoft Solutions Partner.
Best for: Organisations already invested in Microsoft's security stack who want an advisory partner to run and optimise it.
London presence: Genuinely headquartered in London.
Core services:
ITC hosts an annual Cyber Summit in London and works closely with Microsoft as a security partner, which suits organisations that have standardised on Microsoft 365 and Azure and want a provider fluent in that ecosystem rather than a generalist testing house.
What customers mention: Client testimonials on ITC's own site describe a practical, tool-agnostic approach to managed detection and response, moving clients from existing but underused tooling to a fully monitored service rather than starting from scratch.
Considerations: ITC's strength centres on Microsoft-integrated security, so organisations running a different technology stack should confirm that approach fits before engaging.
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S-RM is a London-headquartered global intelligence and cyber security consultancy founded in 2005, with more than 400 practitioners across nine international offices. What sets the firm apart is its pairing of cyber security work with corporate intelligence and investigations, which suits incidents that carry legal, reputational, or transactional complexity alongside the technical breach itself.
Best for: Organisations wanting cyber risk work blended with corporate intelligence, such as M&A due diligence or incidents with a legal or reputational dimension.
London presence: Headquartered in London, with a secondary UK office in Manchester.
Core services:
S-RM holds CREST accreditation and works across investment, M&A, and dispute contexts where a purely technical security firm would only cover part of the picture, making it a natural fit for organisations whose cyber risk sits alongside a wider commercial or legal question. When personal data is involved, that often means coordinating with the ICO's breach reporting process as part of the response, something a consultancy with legal fluency handles more comfortably than a purely technical shop.
What customers mention: S-RM was named Cyber Security Solution of the Year at the Private Equity Wire European Awards 2026, and its Chambers rankings for crisis and risk management point to strong recognition among legal and corporate buyers specifically.
Considerations: S-RM's consultancy model suits complex, high-stakes engagements rather than routine or lower-budget testing work, so smaller organisations with straightforward needs may find better value elsewhere.
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Redscan was founded in London in 2002 and built its name on managed detection and response and penetration testing before being acquired by Kroll in 2021. The team, now part of Kroll's global cyber risk practice, still operates from London and continues to hold its original CREST accreditations.
Best for: Mid-market to enterprise organisations wanting CREST-accredited MDR and penetration testing backed by a global incident response and forensics firm.
London presence: Genuinely London-based, operating from Kroll's London Bridge office.
Core services:
Redscan holds CREST accreditation across penetration testing, SOC services, and cyber incident response, alongside ISO 27001 certification and status as an IASME-licensed Cyber Essentials certification body, which covers most of the credentials a mid-sized enterprise buyer would ask for in one provider.
What customers mention: Industry awards and recognition point to strength in managed detection and response specifically, and being part of Kroll gives clients access to a much larger global incident response bench if a breach escalates beyond what a UK-only team could handle.
Considerations: Since the Kroll acquisition, Redscan's pricing and positioning have moved toward mid-market and enterprise buyers, so smaller organisations should confirm minimum engagement sizes before enquiring. For a broader view of who else operates in this space, see our penetration testing companies in London roundup.
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Urban Network is a London-based managed service provider that has supported businesses across the capital and Essex since 2003, built primarily around IT support with cyber security as a core add-on rather than a standalone specialism. That combination suits SMEs who want one supplier for both.
Best for: SMEs that want day-to-day IT support and foundational cyber security from a single, local provider rather than separate specialists.
London presence: Genuinely London-based, serving clients from the City and Canary Wharf to Shoreditch, Mayfair, and the wider Greater London area.
Core services:
Urban Network is Cyber Essentials Plus accredited and has operated as a certification body for the UK government's IASME scheme since 2014, which gives the firm direct authority when guiding clients through their own Cyber Essentials certification rather than outsourcing that step.
What customers mention: Client feedback is mixed across public review platforms, with some praising a smooth onboarding process and others citing slower response times during service transitions, so ask for recent, sector-relevant references directly.
Considerations: Urban Network suits SMEs bundling IT support with baseline cyber security rather than enterprises needing specialist penetration testing or 24/7 SOC monitoring at scale.
Crossword Cybersecurity is a London-headquartered, publicly listed cyber security firm (LSE: CCS) that commercialises university cyber security research alongside its own consulting and product work. The firm's Nightingale and Trillion product lines apply that academic research to network monitoring and threat intelligence.
Best for: Organisations wanting cyber strategy and risk consulting backed by academic research partnerships, particularly around supply chain and threat detection.
London presence: Genuinely headquartered in London, listed on the London Stock Exchange's AIM market.
Core services:
Crossword works with UK universities to bring academic research into productised tools rather than relying solely on off-the-shelf technology, which appeals to buyers in defence, financial services, and education who want a more research-driven approach to risk and threat detection.
What customers mention: As a publicly listed company, Crossword's client base and sector focus (defence, insurance, investment and retail banks, private equity, and education) are disclosed through its investor reporting rather than customer review platforms, so treat its annual report as the more reliable source of client evidence.
Considerations: Confirm whether you need Crossword's consulting arm, its threat intelligence products, or both, since the two are priced and delivered differently.
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Sophos is a long-established UK cybersecurity vendor headquartered in Abingdon, Oxfordshire, not London, though it maintains a UK office in Manchester and serves enterprise clients across the country, including London, through its channel partner network. Founded in 1985, the company has grown into one of the more recognised names in endpoint and managed security globally.
Best for: Large enterprises wanting proven, large-scale endpoint protection and managed detection and response technology from an established UK-origin vendor rather than local-only delivery.
London presence: Not headquartered or based in London. Sophos serves London clients primarily through its UK Manchester office and its network of channel partners and MSPs.
Core services:
Sophos was listed on the London Stock Exchange until Thoma Bravo acquired the company in 2020, and it now operates as a private company protecting several hundred thousand organisations across roughly 150 countries through its partner-led sales model rather than direct London-based consulting.
What customers mention: Sophos's scale and long operating history give it a large body of independent reviews and case studies across sectors, though most engagements are delivered through a reseller or MSP partner rather than directly, so ask any partner you're considering how much hands-on London support they actually provide.
Considerations: If genuine local delivery matters to you, treat Sophos as a technology choice you access through a partner rather than a London-based service provider in its own right.
Fortinet is a global network security vendor that opened a dedicated London office and Customer Experience Centre at 12 Moorgate in 2026, backed by an investment of more than $50 million as part of its wider EMEA expansion. That gives London clients a genuine local point of contact rather than remote-only vendor support.
Best for: Enterprises needing network security infrastructure, such as firewalls and SD-WAN, backed by a major global vendor with an actual London presence.
London presence: Dedicated company-owned office at 12 Moorgate, alongside further UK offices in Manchester, Reading, and Glasgow.
Core services:
Fortinet's new London office also functions as a Customer Experience Centre, designed for closer collaboration with partners and customers rather than purely as a sales presence, which marks a step up from the smaller UK offices the company has run previously.
What customers mention: As a product-led vendor, Fortinet's customer feedback tends to centre on its technology performance and support responsiveness rather than consulting-style engagements, so weigh reviews of the specific product line you're evaluating rather than the company as a whole.
Considerations: Fortinet is a technology vendor rather than a services consultancy, so most London buyers will still need an implementation partner or managed services provider to deploy and run Fortinet products day to day.
Akamai is a global content delivery and cloud security vendor with a genuine London office in Soho, opened in 2016 to support its growing EMEA business alongside existing UK offices in Addlestone and Edinburgh. The company's security offering grew out of its content delivery network business, giving it particular strength in protecting high-traffic web and application infrastructure.
Best for: Organisations needing DDoS protection, web application and API security, or CDN-integrated security at scale.
London presence: Genuine London office in Soho since 2016, alongside UK offices in Addlestone, Surrey, and Edinburgh, Scotland.
Core services:
Akamai's security services sit on top of its global content delivery network, which means protection scales with traffic volume in a way that's particularly relevant for London-based media, retail, and financial services organisations running high-traffic public-facing platforms.
What customers mention: Akamai's scale gives it a large body of enterprise case studies focused on uptime and attack mitigation during high-traffic events, though as with Fortinet, feedback tends to centre on specific products rather than a single unified service experience.
Considerations: Akamai suits organisations with high-traffic, internet-facing infrastructure specifically. Smaller organisations without that traffic profile are unlikely to see the same value from its CDN-integrated security model.
Write down each provider's answers side by side rather than relying on memory, since the differences often show up in the details rather than the headline pitch.
A financial services firm handling regulated data needs a very different provider from an SME that mainly wants Cyber Essentials certification and basic IT support. If you're outside the capital, our cyber security companies in Manchester guide covers similar ground for that market. Use the comparison table and the questions above to narrow your list to two or three providers, then let their direct answers, not just their marketing, make the final decision.
If any of that matches what you're looking for, the fastest way to find out is a direct conversation rather than another page of service descriptions.
Cyber security moves fast, and a list like this one needs revisiting more often than most content on the site.
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What services do cyber security companies in London provide?
Most cover penetration testing, MDR, SOC services, incident response, cloud security, and compliance consulting.How do I choose a cyber security company in London?
Focus on required services, relevant credentials, London presence, sector experience, and verified reviews.How much do cyber security companies in London charge?
Pricing depends on scope, environment size, testing depth, and whether it's one-off or managed.Should I choose a London-based company or a national provider?
What certifications should a cyber security company have?
Do cyber security companies offer 24/7 monitoring?
What's the difference between a consultancy and an MSSP?