Red Teaming Providers
Red teaming is an advanced adversary simulation exercise that tests an organisation's detection and response capabilities by emulating real-world threat actors. Unlike traditional penetration testing, which focuses on finding vulnerabilities within a defined scope, red team engagements are objective-driven and test the full attack lifecycle from initial reconnaissance through to achieving specific goals such as accessing crown jewel assets, exfiltrating sensitive data, or compromising critical systems.
Red teams use the same tactics, techniques, and procedures (TTPs) as real adversaries, mapped to frameworks like MITRE ATT&CK, and operate with minimal knowledge to simulate a realistic attack. Red teaming tests not just technical controls but also people and processes, evaluating how security teams detect, investigate, and respond to threats.
This makes red teaming particularly valuable for organisations with mature security programmes that want to validate their defensive capabilities against sophisticated attacks. Red team exercises may follow structured frameworks like CBEST, TIBER-EU, or STAR, and are commonly required in highly regulated industries such as financial services, defence, and critical infrastructure.
Related Rankings
SECFORCE
Canary Wharf-based adversary simulation and CBEST-aligned penetration testing consultancy, delivering CREST-accredited offensive security to UK financial services and other organisations with the most demanding requirements.
Dionach
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.
NetSPI
Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
PwC Cyber Security
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.
MDSec
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Trustwave
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Secarma
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Cyberis
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.
Aristi
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.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
JUMPSEC
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Red Teaming FAQs
What is the difference between red teaming and penetration testing?+
Penetration testing finds vulnerabilities within a defined scope. Red teaming is objective-driven, testing detection and response capabilities by simulating realistic attacks across the entire organisation with minimal constraints.
How long does a red team engagement last?+
Red team engagements typically last 4-12 weeks, allowing time for realistic reconnaissance, attack execution, and thorough testing of detection and response capabilities.
Is my organisation ready for red teaming?+
Red teaming is most valuable for organisations with mature security programmes including a SOC, incident response procedures, and endpoint detection. If basic security controls are lacking, penetration testing may be more appropriate first.