69 Best Cybersecurity Startups in London to Watch in 2025

The Definitive Seedtable Ranking of Cybersecurity Startups in London

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 93 start-ups with an aggregate funding of $5.6b. The average funding per company in this subset is $81.2m.

Last update to the database: Feb 18, 2025. See changelog.

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10

Funding Rounds

$1.6b

Money raised

Snyk is a technology company offering a software development security platform using open-source code.

5

Funding Rounds

$37.7m

Money raised

42Crunch is an enterprise API security platform with integrated services, including an API firewall, to discover and remediate API security vulnerabilities.

Location:

Key people:

5

Funding Rounds

$212.8m

Money raised

Pindrop is a cybersecurity company developing voice security and authentication solutions.

Location:

Key people:

8

Funding Rounds

$28.3m

Money raised

Hazy is a machine learning company creating statistically controlled synthetic data for fraud detection and risk modeling.

8

Funding Rounds

$729.5m

Money raised

Sysdig is a unified approach to container security, microservices monitoring, and forensics, with Kubernetes, Prometheus, and Falco support.

Key people:

7

Funding Rounds

$184.7m

Money raised

Tessian (formerly Checkrecipient) is an artificial intelligence email security platform.

4

Funding Rounds

$140.0m

Money raised

iProov is a user authentication technology company based in London.

Location:

Key people:

2

Funding Rounds

$8.0m

Money raised

Crypto Quantique is a company that specializes in quantum cyber security.

Key people:

2

Funding Rounds

$83.0m

Money raised

Mimecast is a London-based cybersecurity and email management platform company founded by Neil Murray and Peter Bauer.

Location:

Key people:

2

Funding Rounds

$3.9m

Money raised

StatusToday is an artificial Intelligence company for Employee Behavioral Analytics founded in 2015 by Ankur Modi.

1

Funding Rounds

$5.0m

Money raised

User authentication and fraud prevention with biometric Identity-as-a-Service. AimBrain provides face, voice, lipsync, behavior and anomaly detection modules.

10

Funding Rounds

$105.0m

Money raised

Elliptic is a blockchain security company founded by Tom Robinson, Adam Joyce, and James Smith.

Location:

Key people:

1

Funding Rounds

$1.0m

Money raised

An artificial intelligence company that has created software to combat astroturfing, harmful social media manipulation campaigns. It was founded in 2018 and has offices in London, England and San Francisco, California.

4

Funding Rounds

$11.2m

Money raised

Post-Quantum is a company that is developing quantum-resistant encryption for protection against code-breaking quantum computers and quantum-resistant signature schemes for secure blockchain deployment.

6

Funding Rounds

$59.9m

Money raised

Yonder is a U.S-based company providing social media threat mitigation software.

3

Funding Rounds

$4.7m

Money raised

Crypta Labs is quantum security startup that is developing a quantum-based encryption chip and software to secure the Internet of Things. The company developed a Quantum Random Number Generator (QRNG) for mobile devices and an integrated security chip for others. The company is targeting transport, military and medical markets.

Key people:

5

Funding Rounds

$101.3m

Money raised

Cleo is a fintech company providing an application for personal finance management.

6

Funding Rounds

$280.5m

Money raised

Darktrace is a British artificial intelligence company for cybersecurity.

8

Funding Rounds

$373.3m

Money raised

Quantexa is a company that enables institutions to make better decisions using their data.

Location:

Key people:

6

Funding Rounds

$19.7m

Money raised

Keyless is a privacy-preserving biometric authentication solutions provider founded in 2019 by Andrea Carmignani, Rolf Hoefer, Giuseppe Ateniese and Fabian Eberle.

Location:

Key people:

1

Funding Rounds

$20.0m

Money raised

Resolver's Integrated Risk Management platform helps plan and prepare your organization to limit the likeliness or impact of security risk and compliance events from occurring.

5

Funding Rounds

$99.6m

Money raised

CybSafe is a cloud-based platform focussed on addressing the human component of cyber security - an intelligent approach to awareness training.

Location:

Key people:

2

Funding Rounds

ArQit is working to provide the world's first global quantum encryption SaaS Business. They will use QKD technology to create unique keys that can be shared between two parties using laser transmissions from a satellite. The company is based in London, England and was founded in 2017.

3

Funding Rounds

$9.5m

Money raised

Talkwalker is a social media analytics and monitoring tool.

11

Funding Rounds

$7.1m

Money raised

My1login is a company founded in 2007 by Michael Newman.

Key people:

1

Funding Rounds

$6.0m

Money raised

Sum&Substance is a developer of remote verification solutions. Our technology allows online services around the world to meet regulatory requirements, prevent fraud and enhance customer confidence.

3

Funding Rounds

$52.0m

Money raised

Platform providing smart fraud detection and prevention to stop online payment fraud.

Location:

Key people:

5

Funding Rounds

$36.3m

Money raised

CyberSmart is a London-based cybersecurity company developing automated compliance platform for small to medium enterprises.

1

Funding Rounds

$40.0m

Money raised

Egress is a software company that specializes in compliance and privacy management solutions for unstructured data.

Location:

Key people:

4

Funding Rounds

$30.4m

Money raised

Xayn is a company founded by Felix Hahmann, Leif Nissen Lundbaek and Michael Huth.

5

Funding Rounds

$3.0m

Money raised

Factmata is a company that provides AI-enhanced digital marketing.

3

Funding Rounds

$63.5m

Money raised

Platform that helps businesses make informed, risk-based security decisions.

Location:

Key people:

7

Funding Rounds

$6.7m

Money raised

PixelPin is a cybersecurity company providing authentication security using pictures rather than passwords.

3

Funding Rounds

$136.0m

Money raised

Privitar was a London-based software development company offering a data security platform. In June 2023, Privitar was acquired by Informatica.

Location:

Key people:

3

Funding Rounds

$60.1m

Money raised

Eigen Technologies is a London-based artificial intelligence company founded in 2014.

1

Funding Rounds

$103.1m

Money raised

Claranet are experts in modernising and running critical applications and infrastructure through end-to-end professional services, managed services and training.

5

Funding Rounds

$72.0m

Money raised

Established in 2015, we called ourselves Digital Risks. We set out with a simple ambition: to make insurance better for digital businesses. We sparked something special: great products, and a seamless experience to match. In 2020, we became Superscript. A name that, by definition, encapsulates what we're all about: elevating our customers by providing better cover. Superscript is about acknowledging all that we've achieved as Digital Risks and taking things to the next level. We now provide advised and online cover for over 1,000 business types. Our mission is to be able to share our ever-evolving customer-led offering with a broader range of businesses. To become a global leader in business insurance.

3

Funding Rounds

$62.0m

Money raised

Wandera is a San Francisco-based cybersecurity company developing mobile security and data management solutions.

Location:

Key people:

4

Funding Rounds

$8.6m

Money raised

Nu Quantum is a company developing quantum security technology founded in 2018 by Dr Carmen Palacios-Berraquero, Yuri Andersson, Matthew Applegate and Mete Atature.

5

Funding Rounds

$165.1m

Money raised

InfoSum provides a decentralized platform designed to remove the trust barriers between progress and privacy.

Location:

Key people:

3

Funding Rounds

$15.5m

Money raised

Muso is a London-based cybersecurity company providing solutions for enterprises.

Location:

Key people:

3

Funding Rounds

$32.8m

Money raised

SenseOn is a London-based technology company offering an AI-powered cyber security platform.

5

Funding Rounds

$134.4m

Money raised

The Only Integrated Email Security and Brand Protection Platform

1

Funding Rounds

$2.5m

Money raised

BitNinja Security is a Debrecen, Hungary-based company offering security information and event management (SIEM) software.

1

Funding Rounds

$2.5m

Money raised

SOC.OS is a London-based cybersecurity company developing an alert correlation product.

Key people:

4

Funding Rounds

$2.0m

Money raised

Spherical Defence is s security solution company in San Francisco, California.

Location:

Key people:

3

Funding Rounds

$69.7m

Money raised

Data intelligence platform that helps global institutions manage strategic risks.

Location:

Key people:

2

Funding Rounds

$20.8m

Money raised

Yoti offer a suite of business solutions that span identity verification, age estimation, e-signing and AI anti-spoofing technologies.

1

Funding Rounds

$276.8k

Money raised

Miracl is a London-based provider of secure authentication services.

2

Funding Rounds

$10.0m

Money raised

Relative Insight is a company founded in 2012 by Phil Greenwood.

Key people:

3

Funding Rounds

$88.4m

Money raised

Hunters.AI is a security Operations Center (SOC) Platform founded in 2018.

2

Funding Rounds

$70.0m

Money raised

Callsign is a London-based cybersecurity and network security company developing multi-factor authentication and authorization engine.

Key people:

1

Funding Rounds

$1.3m

Money raised

Torsion is an innovative information security and compliance engine, which runs either in the cloud or your data centre.

2

Funding Rounds

$33.0m

Money raised

Veridium is a leader in single step - multi factor biometric authentication, designed to safeguard enterprises' most critical assets.

1

Funding Rounds

$2.5m

Money raised

BoxyHQ provides security building blocks for developers. BoxyHQ’s suite of APIs for security and privacy helps engineering teams build and ship compliant cloud applications faster.

2

Funding Rounds

$11.0m

Money raised

Worldr solves security and data protection in team communication, without compromising usability, allowing professionals to communicate and collaborate securely and seamlessly.

1

Funding Rounds

$2.3m

Money raised

eXate provides pioneering technology that empowers organisations to protect, control and manage their sensitive data centrally, providing a complete data privacy solution.

3

Funding Rounds

$14.0m

Money raised

A company that provides a score for personal and SME cybersecurity.

4

Funding Rounds

$12.3m

Money raised

Risk Ledger is a vendor risk management platform founded in 2018 by Haydn Brooks.

Location:

Key people:

2

Funding Rounds

$36.0m

Money raised

Enterprise monitoring service of digital footprints and for data vulnerabilities.

Key people:

1

Funding Rounds

$1.3m

Money raised

CyberOwl's early warning system uses a probabilistic framework to systematically aggregate uncertain and disparate security events to provide real-time visibility of threats to every asset.

3

Funding Rounds

$31.5m

Money raised

Cado Security is pushing digital forensics, and cyber incident response to the next level with an incident response software platform and specialist consulting services.

2

Funding Rounds

$12.0m

Money raised

Simudyne is an artificial Intelligence company founded in 2017 by Justin Lyon.

3

Funding Rounds

$2.1m

Money raised

Fluency is a London-based organization founded by Inga Mullins. Fluency is a CBDC proprietary blockchain revolutionising and powering the existing financial system.

Location:

2

Funding Rounds

$28.5m

Money raised

ScanSafe is a London-based company founded in 2004.

2

Funding Rounds

$10.0m

Money raised

We enable organisations to better organise their information, removing risk and making it more productive and secure.

2

Funding Rounds

$20.0m

Money raised

OutThink is a web-based platform (SaaS) that has been developed specifically to identify and reduce risky workforce behaviours and build a risk aware culture.

1

Funding Rounds

$2.8m

Money raised

Synthesized.io is an artificial Intelligence company founded in 2018 by Nicolai Baldin.

Location:

Key people:

2

Funding Rounds

$7.0m

Money raised

Cynomi is an AI-powered Cyber Protection and Regulation Compliance founded in 2020.

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