Purple Teaming Providers
Purple teaming is a collaborative security exercise that brings together offensive (red team) and defensive (blue team) capabilities to improve an organisation's detection and response posture. Unlike adversarial red team exercises where the blue team is unaware, purple teaming is a cooperative effort where attackers and defenders work side by side.
The red team executes specific attack techniques while the blue team observes whether their tools and processes detect the activity, then jointly works to improve detection rules, response playbooks, and security controls. Purple teaming uses frameworks like MITRE ATT&CK to systematically test coverage across different attack techniques, identify detection gaps, and develop specific mitigations.
This approach maximises the value of both offensive and defensive capabilities by ensuring that every attack technique tested leads to a measurable improvement in detection and response. Purple teaming is particularly effective for organisations that have invested in security operations and want to optimise their return on security tooling investments. It provides clear, actionable outcomes and measurable improvement in security posture.
Related Rankings
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
Nettitude
CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.
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.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Mandiant
World-renowned cybersecurity firm now part of Google Cloud, delivering threat intelligence-led penetration testing and red teaming informed by front-line incident response experience.
Bulletproof
CREST-accredited UK cybersecurity and compliance provider offering penetration testing, managed security services, and regulatory consultancy to over 2,000 customers from its Stevenage headquarters.
TrustedSec
Offensive security firm founded by former NSA operator David Kennedy, delivering CREST-accredited penetration testing, red teaming, and adversary simulation to Fortune 500 and government clients.
GuidePoint Security
US-headquartered cybersecurity consultancy with 800+ employees, serving ~40% of the Fortune 500. FedRAMP 3PAO, PCI QSA, and HITRUST accreditations.
Bishop Fox
Tempe, Arizona-headquartered offensive security firm and Black Hat / DEF CON regulars, makers of the Cosmos continuous attack surface management platform.
Thales Cyber Solutions
Cybersecurity division of the Thales Group, with ANSSI, CREST, FedRAMP 3PAO, and NATO-cleared personnel. Defence, government, and critical infrastructure penetration testing worldwide.
WithSecure
Helsinki-headquartered Finnish cybersecurity firm with roots dating to 1988, offering CREST-accredited penetration testing and deep expertise in EU regulatory compliance including GDPR, NIS 2, and TIBER-EU.
Kroll
Global risk advisory firm with a 400+ person cyber practice. IR-led penetration testing that feeds active breach intelligence straight into test scoping.
Purple Teaming FAQs
What is the difference between purple teaming and red teaming?+
Red teaming is adversarial - the blue team does not know when or how attacks will occur. Purple teaming is collaborative - both teams work together in real-time to test and improve detection and response capabilities.
What do I need in place before purple teaming?+
You need a functioning security operations capability with detection tools (SIEM, EDR), defined response processes, and staff who can participate in the exercises. Purple teaming works best when there is a baseline of security maturity.
How are results measured?+
Results are measured in terms of detection coverage (percentage of tested techniques detected), mean time to detect, mean time to respond, and specific improvements made to detection rules and response playbooks.