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 compliance:NIST CSFISO 27001SOC 2
20 providers
Best UK ProviderBest for EnterpriseResearch Leaders
NCC Group logo

NCC Group

Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.

Manchester, United KingdomContact for pricing
Web ApplicationNetworkMobile App+13
CRESTCHECKCBEST+5
Verified Feb 2026
Nettitude logo

Nettitude

CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.

London, United KingdomContact for pricing
Web ApplicationNetworkMobile App+10
CRESTCHECKCBEST+2
Verified Feb 2026
Dionach logo

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.

Oxford, United KingdomContact for pricing
Web ApplicationNetworkRed Teaming+8
CRESTCHECKSTAR+3
Verified Feb 2026
Bridewell logo

Bridewell

Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.

Bristol, United KingdomContact for pricing
Web ApplicationNetworkCloud+7
CRESTCHECKISO 27001+1
Verified Feb 2026
APT Intelligence LeaderTIBER-EU SpecialistCBEST TestingGoogle Cloud SecurityNation-State Emulation
Mandiant logo

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.

Reston, Virginia, United StatesContact for pricing
Red TeamingPurple TeamingNetwork+6
SOC 2ISO 27001FedRAMP 3PAO
Verified Feb 2026
Bulletproof logo

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.

Stevenage, United KingdomContact for pricing
Web ApplicationNetworkMobile App+8
CRESTISO 27001Cyber Essentials+3
Verified Feb 2026
TrustedSec logo

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.

Fairlawn, Ohio, United StatesContact for pricing
Web ApplicationNetworkCloud+8
CRESTPCI QSA
Verified Mar 2026
Top US ProviderFedRAMP 3PAOPCI QSAHITRUST AssessorEnterprise Scale
GuidePoint Security logo

GuidePoint Security

US-headquartered cybersecurity consultancy with 800+ employees, serving ~40% of the Fortune 500. FedRAMP 3PAO, PCI QSA, and HITRUST accreditations.

Reston, United StatesContact for pricing
Web ApplicationNetworkMobile App+12
FedRAMP 3PAOPCI QSASOC 2+1
Best OverallElite TestersResearch Pioneers
Bishop Fox logo

Bishop Fox

Tempe, Arizona-headquartered offensive security firm and Black Hat / DEF CON regulars, makers of the Cosmos continuous attack surface management platform.

Tempe, Arizona, United StatesContact for pricing
Web ApplicationNetworkMobile App+8
SOC 2OSCP Employer
Verified Feb 2026
Global Defence PlayerANSSI-QualifiedNATO-ClearedFedRAMP 3PAOTIBER-EU Specialist
Thales Cyber Solutions logo

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.

Paris, FranceContact for pricing
Web ApplicationNetworkCloud+9
CRESTFedRAMP 3PAOISO 27001+1
WithSecure logo

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.

Helsinki, FinlandContact for pricing
Web ApplicationNetworkCloud+7
CRESTISO 27001
Verified Feb 2026
IR-Led PentestingGlobal Incident RespondersPCI QSAFinancial Services Leaders
Kroll logo

Kroll

Global risk advisory firm with a 400+ person cyber practice. IR-led penetration testing that feeds active breach intelligence straight into test scoping.

New York, United StatesContact for pricing
Web ApplicationNetworkCloud+9
PCI QSAISO 27001SOC 2

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.