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 compliance:NIST CSFDORANIS 2
23 providers
Top UK ProviderElite TestersResearch-Driven
SECFORCE logo

SECFORCE

Leading UK offensive security consultancy based in Canary Wharf, delivering CREST-accredited penetration testing and adversary simulation to organisations with the most demanding security requirements.

95
Score
LOCLondon, United Kingdom
Web ApplicationNetworkMobile App+9
CRESTISO 27001Cyber Essentials
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.

75
Score
LOCManchester, United Kingdom
Web ApplicationNetworkMobile App+13
CRESTCHECKCBEST+6
Nettitude logo

Nettitude

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

64
Score
LOCLondon, United Kingdom
Web ApplicationNetworkMobile App+10
CRESTCHECKCBEST+2
Best for Mid-MarketBest for Financial Services
NetSPI logo

NetSPI

Leading penetration testing firm with the Resolve platform for continuous attack surface management, trusted by nine of the top ten US banks.

60
Score
LOCMinneapolis, Minnesota, United States
Web ApplicationNetworkCloud+8
SOC 2ISO 27001CREST
Trustwave logo

Trustwave

Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.

57
Score
LOCChicago, Illinois, United States
Web ApplicationNetworkMobile App+7
PCI QSAISO 27001SOC 2+1
Bridewell logo

Bridewell

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

56
Score
LOCBristol, United Kingdom
Web ApplicationNetworkCloud+7
CRESTCHECKISO 27001+1
Pentest People logo

Pentest People

CREST and CHECK-accredited UK penetration testing firm with an innovative SecurePortal platform and transparent pricing for mid-market organizations.

55
Score
LOCLeeds, United Kingdom
Web ApplicationNetworkMobile App+7
CRESTCHECKCyber Essentials Plus+1
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.

53
Score
LOCReston, Virginia, United States
Red TeamingPurple TeamingNetwork+6
SOC 2ISO 27001FedRAMP 3PAO
Best OverallElite TestersResearch Pioneers
Bishop Fox logo

Bishop Fox

Premier US-based offensive security firm known for elite penetration testers, cutting-edge research, and the Cosmos continuous attack surface management platform.

50
Score
LOCTempe, Arizona, United States
Web ApplicationNetworkMobile App+8
SOC 2OSCP Employer
Rapid7 logo

Rapid7

Creators of Metasploit offering enterprise penetration testing integrated with their comprehensive vulnerability management and security operations platform.

50
Score
LOCBoston, Massachusetts, United States
Web ApplicationNetworkMobile App+7
SOC 2ISO 27001
WithSecure logo

WithSecure

Leading European cybersecurity firm offering penetration testing with deep expertise in EU regulatory compliance including GDPR, NIS 2, and TIBER-EU.

49
Score
LOCHelsinki, Finland
Web ApplicationNetworkCloud+7
CRESTISO 27001
Claranet logo

Claranet

CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.

48
Score
LOCLondon, United Kingdom
Web ApplicationNetworkMobile App+5
CRESTCHECKISO 27001+1
Integrity360 logo

Integrity360

CREST-accredited pan-European cybersecurity services provider delivering penetration testing and managed security from Dublin with a strong UK and Ireland presence.

44
Score
LOCDublin, Ireland
Web ApplicationNetworkMobile App+6
CRESTISO 27001SOC 2
Black Hills Information Security logo

Black Hills Information Security

Community-driven penetration testing firm known for free security education, open-source tools, Wild West Hackin' Fest, and practical offensive security services.

44
Score
LOCSpearfish, South Dakota, United States
NetworkWeb ApplicationSocial Engineering+5
SOC 2
SEC Consult logo

SEC Consult

Leading European cybersecurity consultancy from Vienna with a prolific vulnerability research program and deep expertise in IoT and embedded systems security.

43
Score
LOCVienna, Austria
Web ApplicationNetworkMobile App+7
ISO 27001
CrowdStrike logo

CrowdStrike

Global cybersecurity leader leveraging world-class threat intelligence from the Falcon platform to deliver intelligence-led penetration testing and red teaming.

43
Score
LOCAustin, Texas, United States
Red TeamingNetworkWeb Application+5
SOC 2ISO 27001
IOActive logo

IOActive

Elite boutique security consultancy specializing in IoT, SCADA/ICS, embedded systems, and hardware security research with world-renowned researchers.

42
Score
LOCSeattle, Washington, United States
Web ApplicationNetworkIoT+7
OSCP Employer
Secureworks logo

Secureworks

Dell Technologies-backed cybersecurity firm with elite Counter Threat Unit intelligence informing enterprise penetration testing and adversary simulation.

41
Score
LOCAtlanta, Georgia, United States
Web ApplicationNetworkCloud+7
SOC 2ISO 27001
Rhino Security Labs logo

Rhino Security Labs

Cloud security penetration testing specialists known for the Pacu AWS exploitation framework and deep expertise across AWS, Azure, and GCP environments.

41
Score
LOCSeattle, Washington, United States
CloudWeb ApplicationNetwork+4
SOC 2
Praetorian logo

Praetorian

Offensive security firm founded by former DoD professionals, offering elite penetration testing and the Chariot continuous attack surface management platform.

40
Score
LOCAustin, Texas, United States
Web ApplicationNetworkCloud+7
SOC 2
Offensive Security logo

Offensive Security

Creators of OSCP, Kali Linux, and Exploit-DB, offering elite penetration testing services from the team that trains the world's ethical hackers.

40
Score
LOCNew York, New York, United States
Web ApplicationNetworkRed Teaming+5
OSCP Employer
Synack logo

Synack

FedRAMP-authorized crowdsourced penetration testing platform combining vetted elite hackers with AI-powered Hydra technology for continuous security testing.

39
Score
LOCRedwood City, California, United States
Web ApplicationNetworkAPI+4
FedRAMP 3PAOSOC 2
Aon Cyber Solutions logo

Aon Cyber Solutions

Cybersecurity consulting division of global insurance leader Aon, uniquely combining penetration testing with cyber risk quantification and insurance expertise.

36
Score
LOCLondon, United Kingdom
Web ApplicationNetworkCloud+5
ISO 27001SOC 2

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.