Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
Accreditations: SOC 2, ISO 27001, CREST
Services: Web Application, Network, Cloud, API +7
Best Red Teaming Companies (2026)
Red teaming goes beyond traditional penetration testing by simulating realistic, end-to-end attacks against your organisation. The best red teaming companies employ advanced adversary simulation techniques mapped to frameworks like MITRE ATT&CK, testing your detection and response capabilities against sophisticated threat actors.
About this list
These providers specialise in red team engagements including CBEST, TIBER-EU, and bespoke adversary simulations. They are recommended for organisations with mature security programmes that want to validate their defensive capabilities.
Related: Adversary simulation providers · Threat-led penetration testing (TLPT) · DORA threat-led testing
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SECFORCE
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
CRESTCBESTSTARISO 27001ISO 9001
- Holds CREST, CBEST, STAR, ISO 27001, ISO 9001, and Cyber Essentials accreditations.
- In business since 2008 (Companies House 06488355); CREST-accredited for penetration testing since 2011.
- CBEST-accredited since 2015; first TIBER engagement in 2018.
- CREST accreditations: penetration testing, vulnerability assessment and threat-led penetration testing (formerly STAR).
69 providers
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
Accreditations: CREST, CHECK, STAR, ISO 27001, PCI QSA +1
Services: Web Application, Network, Red Teaming, Purple Teaming +7
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +1
Services: Web Application, Network, IoT, Cloud +9
US penetration testing firm founded in 2011, running 600+ engagements a year with a fully remote, US-based team. Manual, expert-led testing across web, network, cloud, mobile, wireless, OT/ICS, and AI/LLM. Gartner Sample Vendor for PTaaS.
Accreditations: OSCP Employer
Services: Web Application, Network, Mobile App, Cloud +12
CREST and CHECK-accredited UK penetration testing and managed security provider formed in 2026 from Pentest People, Bulletproof, and Target Defense, with CREST STAR/TLPT-FS capability and the GuardNest vulnerability management platform.
Accreditations: CREST, CHECK, STAR, NCSC Assured, ISO 27001 +1
Services: Web Application, Network, Mobile App, API +8
Munich- and Budapest-based embedded cybersecurity experts focused on financial services, automotive and mobility, manufacturing and industrial automation, energy and more. The services and platform go beyond compliance, supporting the requirements of the Cyber Resilience Act, PCI PTS, UN R155, ISO/SAE 21434 and other standards and regulations.
Services: IoT, Network, Source Code Review, API +11
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +2
Services: Web Application, Network, Cloud, Red Teaming +6
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Accreditations: CREST, CREST AI Penetration Testing, CHECK, ISO 27001, Cyber Essentials +2
Services: Web Application, Network, Cloud, API +5
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Accreditations: PCI QSA, ISO 27001, SOC 2, CREST
Services: Web Application, Network, Mobile App, Cloud +6
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus +1
Services: Web Application, Network, Mobile App, Cloud +5
CREST and CHECK-accredited UK penetration testing consultancy with CBEST approval, specialising in infrastructure, application, and simulated attack assessments across the public and private sectors.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +3
Services: Web Application, Network, Mobile App, Cloud +4
CHECK and CREST-accredited Birmingham-based cyber security consultancy with over 15 years of experience delivering penetration testing, red teaming, and OT security assessments for government and private sector clients.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus +1
Services: Web Application, Network, Mobile App, Cloud +7
Best Red Teaming Companies (2026), FAQs
What is red teaming and how does it differ from pen testing?+
Red teaming is an objective-driven adversary simulation that tests your organisation's detection and response capabilities. Unlike pen testing, which focuses on finding vulnerabilities within a defined scope, red teaming simulates realistic attacks across the full kill chain to test people, processes, and technology.
How much does a red team engagement cost?+
Red team engagements typically cost between £30,000 and £150,000+ depending on scope, duration, and complexity. Engagements usually last 4-12 weeks. Regulated frameworks like CBEST and TIBER-EU tend to be at the higher end.
Is my organisation ready for red teaming?+
Red teaming is most valuable when you have mature security controls including a SOC, EDR solutions, incident response procedures, and network segmentation. If basic security controls are lacking, traditional pen testing may be more appropriate first.
What is CBEST and TIBER-EU?+
CBEST is the Bank of England's framework for intelligence-led red teaming of financial institutions. TIBER-EU is the European Central Bank's equivalent framework. Both require specialised, accredited red team providers and are mandatory for significant financial entities.
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