20 Best Cybersecurity Companies in the UK

In the ever-evolving digital landscape, securing your business has become as challenging as scaling Mount Everest. Cyberattacks have escalated, and dealing with them seems like trying to decode an enigmatic cipher. You’ve invested in firewall protection and adopted endpoint security, but it’s like battling shadows. You need a proactive shield, not just a protective barrier.

The IT Security scene in the UK is bustling, but it’s like finding a needle in a haystack. There’s an army of cybersecurity firms ready to help, but you need the best. Mistakes are expensive; one slip could lead to a detrimental data breach. This is not a realm for amateurs.

It’s time to meet the champions of cybersecurity in the UK. In this guide, we reveal the top 20 firms specializing in cybersecurity consulting, offering comprehensive cybersecurity solutions, and providing top-tier cybersecurity training. They are the vanguard, skilled in intrusion detection and rapid data breach response. Let’s navigate this intricate matrix together, finding the best partners to bolster your defenses.

1. A-Listware

At A-listware, we deliver practical cybersecurity services to protect your business from ongoing digital threats. With teams based in Europe and delivery hubs supporting clients globally, we specialize in building secure infrastructures, assessing risks, and aligning systems with international compliance standards like ISO 27001, SOC 2, HIPAA, and GDPR.

Curious about the team behind our cybersecurity operations? Meet the Team, and learn how our engineers, DevSecOps specialists, and certified ethical hackers collaborate to safeguard your systems.

Now, let’s talk about what we offer. At A-listware, we provide flexible cybersecurity services from one-time penetration tests and code audits to fully managed detection and response. Our clients include companies in finance, healthcare, e-commerce, telecom, and manufacturing, all supported by real-time monitoring and threat mitigation strategies.

Here’s a glimpse of what we can help with:

• SIEM Deployment. End-to-end design, integration, and tuning of Security Information and Event Management systems
• Application Security. Protection for web, mobile, and cloud apps through audits, code review, and real-time monitoring
• Penetration Testing. Simulated attacks to identify vulnerabilities before real threats occur
• DDoS Protection. Infrastructure stress testing and implementation of response mechanisms
• Compliance Support. Alignment with data protection standards through audits and policy review

We don’t just deliver technical services, we design cybersecurity strategies that reflect the specific context of your industry and operations.

Ready to strengthen your security posture? Kontakt, and let’s build a tailored cybersecurity solution for your business.

• Headquarters: London, UK
• Founded: 2017
• Specialization: Cybersecurity Services, Infrastructure Audits, Managed Security

2. Sophos

With its central operations based in Abingdon, UK, Sophos stands at the forefront of modern cybersecurity, offering protection to more than 400,000 organizations of varying sizes across over 150 countries. This defense is against the increasingly sophisticated cyber threats we face today. Established in Oxford, UK, in 1985, Sophos is committed to delivering robust security solutions predominantly for mid-sized businesses and practical enterprise applications. Their extensive range of products spans across endpoint, network, and cloud security, among others. Acknowledged for their innovative contributions to cybersecurity, Sophos persistently adapts to the fluctuating cyber threat environment.

• Headquarters: Abingdon, UK
• Founded: 1985
• Specialization: Endpoint, Network, Cloud Security

3. Avast

Avast is a multinational cybersecurity software company that has been protecting people from threats on the internet for over three decades. Although headquartered in Prague, Czech Republic, Avast has a significant presence in the UK with an office in London. They offer a comprehensive suite of security services, including antivirus software, VPN services, and tools for privacy and performance optimization. 

Avast’s advanced threat detection networks, powered by artificial intelligence, protect over 435 million users worldwide from viruses, malware, and other security breaches.

• Headquarters: Prague, Czech Republic (UK office in London)
• Founded: 1988
• Specialization: Antivirus Software, VPN Services, Privacy and Performance Tools

4. BullGuard

BullGuard is a London-based cybersecurity company that has been providing internet security solutions since 2002. They specialize in award-winning, easy-to-use products that provide robust protection against all types of cyber threats. BullGuard’s product range includes internet security, mobile security, and identity protection solutions. The company is notably recognized for its creative Secure Browser, a proprietary browser engineered to offer a more secure online browsing experience and a safer platform for conducting online transactions. Furthermore, they provide round-the-clock advanced technical assistance to address any challenges that customers may face.

• Headquarters: London, UK
• Founded: 2002
• Specialization: Internet Security, Mobile Security, Identity Protection

5. Darktrace

Established in 2013 by a team of Cambridge University mathematicians, Darktrace has rapidly ascended to a distinguished position within the realm of cybersecurity. The firm’s primary offering, dubbed the Enterprise Immune System, harnesses the power of artificial intelligence for real-time identification and response to cyber threats. This pioneering methodology, modeled after the functioning of the human immune system, equips Darktrace to spot potential threats that other security protocols may overlook, including insider risks and emerging, unrecognized threats. Darktrace’s dedication to technological advancement and its distinct AI-centric strategy in cybersecurity have garnered numerous accolades, solidifying its status among the leading cybersecurity firms in the UK.

• Headquarters: Cambridge, UK
• Founded: 2013
• Specialization: AI-driven Cyber Defense

6. Deep Secure

Deep Secure, based in Malvern, is a cybersecurity company that provides innovative solutions to protect against content threats. They offer a unique approach to cybersecurity, focusing on eliminating threats concealed in business content. Deep Secure’s technology deals with the threat without examining content, ensuring complete security without compromising productivity or privacy.

• Headquarters: Malvern, UK
• Founded: 2010
• Specialization: Content Threat Removal

7. ZoneFox

ZoneFox, headquartered in Edinburgh, is a cybersecurity company that specializes in insider threat detection. Their award-winning platform helps businesses protect their sensitive data by monitoring user behavior and data movement both on and off the network. ZoneFox’s machine learning technology helps organizations identify malicious activities quickly and efficiently.

• Headquarters: Edinburgh, UK
• Founded: 2010
• Specialization: Insider Threat Detection

8. Glasswall Solutions

Glasswall Solutions, based in London, is a cybersecurity company that provides organizations with unique protection against file-based threats. Their patented technology regenerates files to a known good state in real-time, ensuring they are safe and threat-free. Glasswall’s innovative approach to cybersecurity helps businesses protect their data without disrupting workflow.

• Headquarters: London, UK
• Founded: 2005
• Specialization: File-based Threat Protection

9. Digital Shadows

Digital Shadows, headquartered in London, provides cyber situational awareness that helps organizations protect against cyber threats, data loss, and reputation damage. Their SearchLight service provides a view of an organization’s digital footprint and the profile of its attackers. This service combines scalable data analytics with human analysts to manage and mitigate risks.

• Headquarters: London, UK
• Founded: 2011
• Specialization: Cyber Situational Awareness

10. Tessian

Tessian, headquartered in London, is a cybersecurity company that uses machine learning to secure enterprises from threats executed by humans. Founded in 2013, Tessian’s mission is to secure the human layer of organizations by automatically protecting employees on email – where they spend 40% of their time at work. Their technology understands human behavior and relationships, enabling it to detect and prevent dangerous activity like data exfiltration, accidental data loss, and phishing attacks. Tessian ensures email security for some of the most prominent organizations globally, spanning industries such as finance, law, and technology.

• Headquarters: London, UK
• Founded: 2013
• Specialization: Email Security

11. Panaseer

Panaseer is a London-based cybersecurity company that offers continuous controls monitoring for enterprise security. Founded in 2014, Panaseer’s platform takes data from security, IT, and business solutions to provide a comprehensive view of an organization’s security posture. Their unique approach to cybersecurity enables organizations to make data-driven decisions and prioritize efforts based on risk. Panaseer helps clients to identify gaps in controls coverage, align security with framework standards, and demonstrate compliance with regulations.

• Headquarters: London, UK
• Founded: 2014
• Specialization: Continuous Controls Monitoring

12. Featurespace

Based in Cambridge, Featurespace holds a leading position worldwide in the fields of risk mitigation and fraud identification. Established in 2008 as a derivative of the University of Cambridge, Featurespace has pioneered the evolution of Adaptive Behavioral Analytics technology. This tech is used to discern and counteract fraudulent actions and financial crimes, specifically within industries like finance, insurance, and gaming. Featurespace leverages real-time machine learning algorithms to excel in spotting fraudulent undertakings by identifying unusual personal behaviors. This heightened ability allows businesses to actively diminish risks, which in turn preserves the trust and assurance of their customers.

• Headquarters: Cambridge, UK
• Founded: 2008
• Specialization: Fraud Detection and Risk Prevention

13. Callsign

Callsign is a London-based cybersecurity company that provides AI-driven intelligence-driven identity and authentication solutions. Founded in 2012, Callsign’s mission is to make digital identification easy and safe for everyone and everything. In doing so, they make the internet a safer place for users and enterprises. Their Intelligence Driven Authentication (IDA) solution enables users to seamlessly authenticate online, without the need for passwords. Callsign’s technology is used by some of the world’s largest banks, government organizations, and enterprises.

• Headquarters: London, UK
• Founded: 2012
• Specialization: Identity and Authentication Solutions

14. CyberSmart

CyberSmart, based in London, is a cybersecurity company that focuses on providing automated compliance and security tools. Founded in 2017, CyberSmart identifies vulnerabilities, fixes issues, and helps maintain compliance standards, all from one platform. Their goal is to make cybersecurity accessible and understandable for all businesses, regardless of their size or technical expertise. CyberSmart’s platform continuously checks devices against security standards and instantly alerts the user to any non-compliance.

• Headquarters: London, UK
• Founded: 2017
• Specialization: Automated Compliance and Security Tools

15. SenseOn

Based in London, SenseOn presents a distinctive cybersecurity approach that sets it apart. Established in 2017, the company employs AI Triangulation technology to replicate the cognitive processes and actions of human security analysts, automating the tasks of threat detection, investigation, and response. By examining user and device behaviors from multiple angles, making informed decisions, and executing autonomous actions, SenseOn delivers precise threat detection that adapts alongside your organization’s expansion. SenseOn optimizes the efficiency of security teams, saving them valuable time and resources by minimizing false positives and enhancing overall productivity.

• Headquarters: London, UK
• Founded: 2017
• Specialization: AI Triangulation for Threat Detection

16. Cylon

Cylon, or Cyber London, is a leading cybersecurity accelerator in the UK. Founded in 2015, Cylon provides a platform for cybersecurity startups to connect with a wide network of investors, mentors, and potential clients. They offer a comprehensive 13-week program that provides startups with the tools, connections, and skills they need to grow and succeed. Cylon has helped numerous cybersecurity startups to launch and grow their businesses, making it a key player in the UK’s cybersecurity ecosystem.

• Headquarters: London, UK
• Founded: 2015
• Specialization: Cybersecurity Accelerator

17. Ripjar

Ripjar is a global company based in the UK that provides a data intelligence platform powered by machine learning. Founded by former members of the UK’s Government Communications Headquarters in 2012, Ripjar’s platform allows organizations to analyze and manage vast amounts of data from various sources, enabling them to detect and respond to threats in real-time. Ripjar’s clients include governments, corporations, and financial institutions.

• Headquarters: Cheltenham, UK
• Founded: 2012
• Specialization: Data Intelligence

18. Netcraft

Based in Bath, UK, Netcraft is a renowned internet services company established in 1995. Its core focus lies in providing a comprehensive range of internet security services to combat cyber threats. These services encompass anti-fraud and anti-phishing measures, application testing, and internet data mining. Netcraft’s exceptional services have earned the trust of numerous prominent banks, governments, and organizations globally, serving as a crucial shield against potential cyber risks.

• Headquarters: Bath, UK
• Founded: 1995
• Specialization: Internet Security Services

19. iProov

iProov is a London-based cybersecurity company that specializes in biometric facial verification technology. Founded in 2011, iProov’s technology uses controlled illumination to authenticate users’ faces, ensuring that the person presenting themselves for verification is the correct person. This technology is used by governments, banks, and other organizations worldwide to secure digital identities.

• Headquarters: London, UK
• Founded: 2011
• Specialization: Biometric Facial Verification Technology

20. CyberOwl

CyberOwl, based in Coventry, is a cybersecurity company that provides early warning of cyber-physical attacks on operational technology. Founded in 2016, CyberOwl’s platform uses a probabilistic framework to provide real-time situational awareness and prioritized risk information, helping organizations to take preventative action against potential threats. CyberOwl is particularly focused on maritime, industrial control systems, and smart transport applications.

• Headquarters: Coventry, UK
• Founded: 2016
• Specialization: Operational Technology Cybersecurity

Schlussfolgerung

In the fast-paced, evolving world of cyber threats, choosing a reliable partner is essential. This guide to the top 20 cybersecurity firms in the UK can be your compass in finding the right solution. These firms are on the front line, providing bespoke services tailored to individual business needs. Use this guide to navigate the UK’s cybersecurity landscape and fortify your organization’s defenses. Secure your digital frontier with the UK’s top cybersecurity specialists and elevate your cybersecurity stance.