Nexor

What Nexor does

Nexor Limited is a Nottingham-headquartered, privately held UK cybersecurity specialist founded in 1991, focused on secure information exchange for defence, government, law enforcement, and critical national infrastructure organisations. Its core offering is a portfolio of cross-domain solutions that enable controlled data transfer between networks of different security classifications, built on the company's proprietary Secure Information eXchange Architecture (SIXA) framework. Flagship products include the Nexor Data Diode (hardware-enforced uni-directional transfer), Nexor GuarDiode (data diode with integrated Content Disarm and Reconstruction), Nexor Guardian (data guard for malware and data-loss protection), Nexor Sentinel (email guard), Nexor Edge (compact guards for space-constrained tactical environments), and Nexor Protean (a cloud-native High Assurance Software Defined Gateway launched in September 2023). The company integrates third-party CDR (Glasswall, PuriFile) and hardware diode (Oakdoor, FoxCrypto) technologies into these offerings.

The company generates revenue through a mix of one-time hardware purchases, recurring software licenses and subscriptions (Protean, GuarDiode, Sentinel), and professional services including security consultancy, risk assessments, and Secure-by-Design advisory work. It sells predominantly via a direct enterprise field sales model into UK government and defence customers, supported by a partner ecosystem of system integrators (Sopra Steria), technology providers (Envitia, 2iC, Craft, Lab 1), and hardware/software specialists. Pricing is quote-based and tailored to customer accreditation requirements, with multi-year contracts. The business holds HM Government accreditation, ISO 27001, ISO 9001, Cyber Essentials Plus, and JOSCAR registration, and employs security-cleared personnel — prerequisites for high-assurance work with the UK MOD and other sensitive customers. Recent activity includes leadership to the MDIS consortium (Sep 2023), strategic alliances with Oakdoor and Glasswall (May 2024), a new Supply Chain Security service line (Jan 2025), and senior leadership appointments across Sales, Services, and Delivery & Operations through 2025–2026.

Name

Nexor

Legal name

Nexor Limited

Website

https://nexor.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

51–100 employees

Short description

Nexor is a UK-based secure information exchange specialist founded in 1991, providing hardware-enforced cross-domain solutions — including data diodes, content guards, and cloud-native gateways — to UK and allied defence, government, law enforcement, and critical national infrastructure organisations.

Ownership category

akta.pro rank

Product category

Cross-Domain Cybersecurity Solutions

NAICS

Security Systems Services (except Locksmiths) (561621), Computer Systems Design Services (541512), Other Computer Related Services (541519), Custom Computer Programming Services (541511)

SIC

Services-Computer Integrated Systems Design (7373), Services-Computer Programming Services (7371)

akta.pro primary industry

Critical Infrastructure Protection (CIP) & NERC-CIP Compliance (HDADAJAC)

Keywords

• Cross-domain security solutions
• Secure information exchange
• Hardware data diode
• Government cyber security
• High assurance networking

Headquarters

HQ city

Nottingham

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Operations, Marketing or Sales, Supply Chain, Infrastructure

Revenue model

1. Product Sales: Hardware-based data diodes and cross-domain solutions sold as one-time capital purchases with optional maintenance contracts
2. Software Licenses and Subscriptions: Software-based products including GuarDiode, Protean, and Sentinel licensed on annual subscription basis with tiered support levels
3. Professional Services and Consultancy: Security consultancy services including risk assessments, security architecture reviews, and compliance advisory for government and defence clients

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Nexor designs, builds and supports high-assurance cross-domain cybersecurity products and advisory services that enable secure information exchange between networks of different security classifications. Its offering combines hardware-enforced data diodes and software-defined gateways with cyber security advisory, secure-by-design consulting, research and innovation, and supply chain security services for Defence, Government, Law Enforcement and Critical National Infrastructure customers in the UK and allied nations.

Product overview

Nexor is a Secure Information Exchange Specialist offering a unified portfolio of cross-domain security solutions. The core product line centres on hardware and software guards that enable secure data transfer between networks of different security classifications. The flagship offerings include: Nexor Protean (Software Defined Gateway for cloud environments), Nexor Data Diode (hardware-enforced one-way data transfer), Nexor GuarDiode (enhanced diode with content filtering and CDR), Nexor Guardian (data guard for malware protection), Nexor Sentinel (email security guard), and Nexor Edge (compact solutions for space-constrained environments). These products are built on Nexor's proprietary Secure Information eXchange Architecture (SIXA) and integrate with third-party CDR technology partners (Glasswall, PuriFile) and hardware diode providers (Oakdoor, FoxCrypto) to deliver comprehensive cross-domain solutions for Defence, Government, Law Enforcement, and Critical National Infrastructure organisations.

Differentiator

Problem solved

Functional benefit

Brands

• SIXA: Secure Information eXchange Architecture - Nexor's architectural framework for secure information exchange
• Nexor Protean
• Nexor GuarDiode
• Nexor Data Diode
• Nexor Guardian
• Nexor Sentinel
• Nexor Edge
• CyberShield Secure

Products and services

• Nexor Protean (Software Defined Gateway) High Assurance Software Defined Gateway offering secure information exchange capabilities in cloud environments, with rapid deployment, automated scalability, Deep Content Inspection, Content Disarm and Reconstruction / Transform functionality, and dynamic policy management for cross-domain solutions. Built on Nexor's SIXA architecture and targeted at Defence, Government, Law Enforcement and CNI customers.
• Nexor Data Diode Hardware-based data diode providing a 100% guarantee that data will never leak back to an untrusted network through uni-directional data flow. Protects sensitive information from cyber threats and unauthorised access by physically preventing return traffic between classified and unclassified networks. Targeted at Defence, Government, Law Enforcement and CNI customers with classified environments.
• Nexor GuarDiode (Enhanced Data Diode) Enhanced Data Diode enabling safe import and filtering of data from untrusted networks with secure uni-directional data transfer, including integrated Content Disarm and Reconstruction (CDR) capabilities. Designed for multi-directional data transfer scenarios in defence and government environments where imported content must be sanitised before entering trusted networks.
• Nexor Guardian (Data Guard) Data Guard solution that reduces the risk of malware attacks and data loss through content filtering and security controls for secure information exchange between networks of different trust levels. Sits within Nexor's cross-domain product portfolio as a software-based guard.
• Nexor Sentinel (Email Guard) Email Guard solution that prevents information loss via email and reduces the risk of malware attacks through content inspection and secure handling of email communications across classified and unclassified networks. Targeted at organisations needing to safeguard sensitive email exchanges in defence and government settings.
• Nexor Edge (Edge Guard family) Edge Guard family of cross-domain security solutions designed for space-constrained locations, occupying only a fraction of the space required by traditional solutions, including slim form-factor variants of Nexor Data Diode Core and Nexor GuarDiode. Provides trusted cross-domain protection for tactical edge, operational technology and industrial control system environments.
• Nexor Cyber Security Advisory Services A portfolio of advisory consulting services covering Supply Chain Security assessment, Secure Information Exchange Solution Design for complex and classified networks, Secure by Design implementation, and Cyber Security Strategy & Policy Design. Delivered by Nexor's security-cleared consultants to Defence, Government, Law Enforcement and CNI clients in the UK and allied nations.
• Nexor Research & Innovation Services Customer-funded research, innovation and experimentation services in secure interoperability and information exchange, covering Nexor's areas of technical interest such as the Single Information Environment, Data Centric Security, Secure by Design and ISMS. Delivered by security-cleared personnel including NCSC Lead CCP-qualified consultants.
• Nexor Secure Digital Solutions Delivery and integration service line for Nexor's cross-domain security solutions, supporting customers in deploying Nexor products (diodes, guards, Software Defined Gateway) and SIXA-based architectures into operational defence, government and CNI environments.

Quantifiable outcome

• Hardware-enforced one-way data transfer eliminates network-based data exfiltration vectors

Named customers9 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

Feature8 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• EnvitiacoreStrategic or Co-development PartnerConsortium partner for MDIS (Ministry of Defence Information Systems) project, working together on government security initiatives
• 2ICcoreStrategic or Co-development PartnerConsortium partner for MDIS project collaboration
• Oakdoor (PA Consulting)coreStrategic or Co-development PartnerStrategic partnership for high assurance security solutions, combining Oakdoor's expertise with Nexor's cross-domain technology for government customers
• GlasswallcoreTechnology or IntegrationStrategic alliance integrating Glasswall's Content Disarm and Reconstruction (CDR) technology with Nexor's cross-domain solutions for enhanced document security
• Sopra SteriaminorImplementation/ SI/ Consulting PartnerExisting partner relationship for system integration and consulting services in government security projects
• CraftcoreStrategic or Co-development PartnerPartnership for supply chain security service, providing comprehensive security assessments for defence and CNI supply chains
• Lab 1coreStrategic or Co-development PartnerPartnership for supply chain security service, offering security evaluation and testing services for supply chain risk management

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Thales: Global defence and digital security prime with significant UK presence and cross-domain / high-assurance cyber offerings. Comparable as a much larger incumbent competing for the same MOD and CNI procurement budgets.
• BAE Systems: UK defence prime with a broad cyber and secure information exchange portfolio that overlaps with Nexor's MOD customer base. Competes on large integrated programmes where Nexor often participates as a sub-contractor.
• Forcepoint: Global cybersecurity vendor with cross-domain and high-assurance offerings rooted in its former defence business. Comparable as a broader incumbent that historically competed with Nexor's Sentinel and Guardian product lines.
• Leonardo: Italian-headquartered defence and cyber prime with UK operations and cross-domain capabilities. Comparable as a broader incumbent supplying allied-nation defence customers in markets where Nexor also operates.

Regional players

• QinetiQ: UK-headquartered defence technology specialist providing cyber, information assurance, and secure communications to MOD. Directly comparable UK-region competitor with overlapping customer set.

Direct peers

• Advenica: Swedish supplier of data diodes and cross-domain cybersecurity solutions certified for European defence and government use. Comparable as a European-region high-assurance cross-domain specialist with similar product positioning.
• Owl Cyber Defense: US-based specialist in hardware data diodes and cross-domain solutions for defence and intelligence customers. Closest direct comparable to Nexor's Data Diode and GuarDiode product lines, operating in the same high-assurance niche.
• Everfox (formerly Forcepoint Federal): High-assurance cross-domain, insider threat, and content security provider historically tied to US DoD and intelligence community. Comparable as a dedicated cross-domain solutions vendor with a similar product taxonomy.

Emerging players

• PA Consulting (Oakdoor): Oakdoor, part of PA Consulting, is a strategic partner of Nexor but also competes in adjacent high-assurance data diode territory. Dual partner/competitor dynamic mirrors a comparable niche cyber posture.

Others

• Glasswall Solutions: CDR technology provider that is both a strategic partner (integrated into Nexor Protean) and an adjacent security vendor. Comparable as a thematically adjacent cyber specialist targeting the same high-assurance government buyers.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/nexor

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

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 Nexor