All companies

Sift provides a fraud prevention platform that uses machine learning to distinguish legitimate customers from fraudsters in real time.

Signifyd provides a commerce protection platform that helps online retailers approve orders and reduce fraud.

Silobreaker provides a software platform that gathers and analyses security and risk intelligence for organisations.

Silverfort provides runtime identity security for enterprises, protecting human and machine identities across cloud and on-premises environments.

Simbian provides AI agents that automate security operations tasks such as alert triage and threat hunting.

simler provides an AI platform for generating and running cybersecurity tabletop exercises.

SkillBit provides hands-on cybersecurity skills training and assessment through bite-sized labs.

SkyCloud provides software for managing and automating firewall security policies across multiple vendors.

Skyhigh Security provides data-first security service edge for cloud and hybrid environments.

SmartKeeper is a security company that sells endpoint protection and control products.

Snyk provides a security platform that finds and fixes vulnerabilities in code, dependencies, containers, and cloud infrastructure.

OSINT and social media investigation software, including SL Crimewall, an API and a Maltego integration, used by law enforcement and corporate security teams.

Socure provides an AI-powered identity verification and fraud prevention platform.

Soken is a Web3 services firm based in London.

Solcept AG is a Swiss engineering firm based in Wetzikon.

CREST-accredited UK penetration testing consultancy based in Shropshire, delivering web application, API, infrastructure, cloud, mobile, and AI/LLM testing. A small specialist team, with a retest included in every engagement.

Sonar provides a platform that verifies code quality and security for developers.

Sonatype provides tools to manage and secure open source components and AI models in software development.

SonicWall provides unified cybersecurity for SMBs, MSPs, and IT teams.

Sophos provides cybersecurity products and managed detection and response services to organisations worldwide.

SoSafe provides security awareness training and human risk management to help organisations reduce cyber threats.

Adversary-focused security firm created by former DoD red team operators. Creators of BloodHound. CREST-accredited for penetration testing, red teaming, and purple team assessments.

Splunk provides a data platform for security, observability, and AI.

SpyCloud is a cybersecurity company that specialises in identity threat protection.

German security lab in Bonn, recognised by the PCI SSC for PTS device evaluation, plus German payment terminal schemes.

SSL.com issues digital certificates and provides PKI solutions for secure communications and content.

Provides managed IT services, cybersecurity, compliance support and AI adoption guidance to businesses.

Stamus Networks provides network detection and response systems for enterprise security teams.

Standoff 365 runs bug bounty and cyber stress testing programmes with ethical hackers.

Stellar Cyber provides an AI-native security operations platform that unifies detection and response tools.

StingBox sells a network honeypot and intrusion alarm.

Toronto-based PTaaS provider delivering continuous penetration testing for Canadian fintech, SaaS, and OSFI-regulated organisations.

Stormshield provides cybersecurity solutions for networks, endpoints, data, and industrial environments.

Straiker provides security teams with tools to discover, test, and defend AI agents in enterprises.

Award-winning CREST-certified managed cyber security and IT support provider with offices in Bristol, London, and Manchester, specialising in penetration testing and Microsoft security technologies.

StrongDM provides just-in-time, least-privilege access to databases, containers, cloud infrastructure and AI agents.

StrongestLayer provides AI email security for Microsoft 365 and Google Workspace.

Sucuri provides cloud-based website security.

Sumo Logic provides cloud log management, monitoring, and SIEM tools for security and operations teams.

Suped is an Australian company that sells a DMARC platform for IT teams.

SurePay provides Verification of Payee services to banks, payment service providers, and corporates.

SurfaceDiff scans public internet infrastructure and alerts on changes to domains, ports, and certificates.

Singapore CREST-accredited and CSA-licensed offensive security boutique. Manual, senior-led testing with strong MAS TRM and PDPA expertise.

Swif.ai sells mobile device management and unified endpoint management software.

Swimlane provides agentic AI automation for security operations, vulnerability management, and compliance.

Sygnia provides cyber incident response, readiness, and managed detection and response services to enterprises worldwide.

Symmatrics provides one-time pad encryption products for data in transit and at rest.

FedRAMP-authorized crowdsourced penetration testing platform combining the vetted SRT researcher community with AI-powered Hydra technology for continuous security testing.

SyntaAI sells Syntasec, an on-premise security and compliance platform for SAP systems.

Sysdig provides cloud security built on the open-source Falco project, with an emphasis on runtime detection inside running workloads.