What X41 Limited does

X41 Limited is a private cybersecurity services firm that delivers three core offerings: penetration testing, secure systems design, and red teaming. Penetration testing engagements identify vulnerabilities across applications, systems, or networks and return risk-classified findings with practical remediation guidance. Secure systems design is a consulting engagement that integrates security into systems from project inception, working alongside client teams or their third-party suppliers. Red teaming is a longer-form engagement that emulates real-world adversaries (such as ransomware gangs or invoice fraud crews) against the full defense ecosystem — people, processes, technology, and detection — with an explicit goal of upskilling the client's IT teams or suppliers.

The firm positions its entire service line as manual, expert-driven work delivered by CREST accredited individuals, and explicitly avoids automated vulnerability scanners. The go-to-market is sales-led, with direct engagement to client organizations or coordinated with their existing third-party suppliers; pricing is not publicly disclosed and engagements appear to be project-based or retainer-style. The public footprint is intentionally minimal — a single Squarespace-hosted website at x41.io with service descriptions and a single contact email ([email protected]), no disclosed leadership, no customer logos, no press, no funding history, and no disclosed headcount, certifications registry, or geographic markets served.

Name

X41 Limited

Legal name

X41 Limited

Website

https://x41.io

Company type

Private

Operating status

Operating

Short description

X41 Limited is a private cybersecurity services firm offering manual penetration testing, secure systems design, and red teaming delivered by CREST accredited professionals to enterprise and mid-market organizations.

Ownership category

akta.pro rank

Product category

Cybersecurity Services

NAICS

Other Computer Related Services (541519)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Vulnerability Assessment, Security Audits & Compliance Testing (BPAKAHAG)

akta.pro secondary industries

Penetration Testing, Red Team & Ethical Hacking (EDAOAIAH), Vulnerability Assessment & Scanning (HDADAHAA)

Keywords

• Penetration testing services
• Red team assessments
• Secure systems design
• Vulnerability management services
• Cyber security consulting

GTM type

B2B

Offering type

Services

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. Professional Security Services: X41 generates revenue through professional security services engagements including penetration testing, secure systems design, and red teaming. Services are delivered by CREST accredited individuals and typically involve project-based or retainer arrangements with organizations.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

X41 provides professional cyber security services including penetration testing of applications, systems, and networks, secure systems design consulting, and red teaming engagements that emulate real-world adversaries such as ransomware gangs and invoice fraud crews. All assessments are performed manually by CREST accredited individuals, with every discovered vulnerability classified by risk and accompanied by practical remediation guidance. The firm works directly with client internal teams or third-party suppliers to bake security into development and to upskill IT teams for ongoing threat detection and mitigation.

Product overview

X41 Limited is a cybersecurity services firm offering three core service offerings: Penetration Testing (technical vulnerability assessments on applications, systems, or networks), Secure Systems Design (security-by-design consultation for development teams and suppliers), and Red Teaming (comprehensive organizational defense testing emulating real-world adversaries). These services are delivered by CREST accredited professionals and focus on practical vulnerability identification, security integration from project inception, and organizational capability building.

Differentiator

Problem solved

Functional benefit

Products and services

• Penetration Testing Technical assessments on applications, systems, or networks performed by CREST accredited individuals to identify all vulnerabilities that may exist. Every discovered vulnerability is classified by risk and accompanied by practical guidance and fixes; the service does not rely on automated vulnerability scanners. It is offered to organizations needing accredited manual vulnerability identification.
• Secure Systems Design Security-by-design consulting delivered by working with client internal teams or third-party suppliers to integrate security from the start of system development, minimizing issues that may arise later in the development process. It is offered to organizations building applications, systems, or networks that need security baked in from inception.
• Red Teaming Longer-term engagements that test the entire defenses of an organization, covering people, processes, technology, and detection capability. The service emulates real-world adversaries such as ransomware gangs or invoice fraud crews and is flexible to organizational needs. A key output is upskilling internal IT teams or third-party suppliers to detect and mitigate future threats.

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Recent moves4 records

Expansion highlights3 records

Broad incumbents

• Mandiant: Mandiant (now part of Google Cloud) is a broad incumbent cybersecurity services firm with a major red team, penetration testing, and adversary simulation practice. Comparable as a much larger incumbent competing for the same enterprise offensive security engagements.
• NCC Group: NCC Group is a global cybersecurity services firm with a significant penetration testing and red team practice alongside a broader assurance portfolio. Comparable as a larger incumbent operating in the same offensive security services category.

Direct peers

• Praetorian: Praetorian is a US cybersecurity services firm offering penetration testing, red teaming, and attack surface management. Comparable as a boutique offensive security provider with overlapping service offerings.
• Cure53: Cure53 is a Berlin-based boutique security firm focused on manual penetration testing and security audits delivered by senior researchers. Comparable to X41's manual, expert-led, non-automated assessment model.
• Secarma: Secarma is a UK-based boutique cybersecurity firm offering penetration testing and security consulting services. Comparable as a similarly-sized UK boutique with overlapping offensive security service lines.
• Trail of Bits: Trail of Bits is a US-based boutique cybersecurity firm offering penetration testing, security audits, and red team engagements. Comparable as a specialist offensive security provider emphasizing expert-led manual work.
• Compass Security: Compass Security is a Switzerland-based boutique cybersecurity firm offering penetration testing and red team services. Comparable as a similarly-sized European specialist boutique competitor.
• MDSec: MDSec is a UK-based boutique cybersecurity services firm specializing in penetration testing, red teaming, and adversary simulation. It is a highly comparable peer given similar scope, boutique positioning, and UK operating geography.
• Bishop Fox: Bishop Fox is a US-based boutique offensive security firm offering penetration testing, red teaming, and security assessments. Comparable as a similarly-positioned boutique competitor with overlapping service lines.
• Cyberis: Cyberis is a UK-based boutique cybersecurity services firm specializing in penetration testing, red teaming, and incident response. Comparable in geographic footprint and boutique offensive security positioning.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks1 record

Key highlights5 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about X41 Limited