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Defence Companies in Southampton: 30 Active Firms (2026)
Defence companies in Southampton provide security, engineering and operational services for national-security and maritime customers.
Buying centres tend to sit in security operations, maritime engineering, infrastructure assurance, programme delivery and technical consulting, rather than discretionary back-office spend. Southampton suppliers in this field usually sell to public-sector bodies, defence-prime contractors, port and maritime operators, and security-sensitive commercial customers. Engagements are commonly framed as framework call-offs, specialist work packages, managed services or project consultancy, with buyers testing delivery capacity, assurance processes and continuity before price alone. The commercial shape is more SME and mid-market services than venture-backed product software, although systems integration and technical support often sit close to customer operations.
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Southampton’s list is compact: 30 defence firms are actively trading, with reported employment of 2,483 people across the cohort. That employment footprint points to a market with delivery capacity beyond sole-consultant advisory work, though it still looks more like a set of specialist operators than a broad industrial base. The mix appears suited to maritime, infrastructure and national-security customers that need local response, cleared personnel, engineering support and managed operational services. Revenue concentration is likely to matter when comparing suppliers, because a small number of larger employers can change the apparent scale of the market.
National-security and maritime buyers tend to impose operating requirements through procurement, contract assurance and site-access controls rather than through a single sector rulebook. Suppliers may need to evidence security procedures, cyber controls, personnel vetting, subcontractor oversight and continuity planning before they can be trusted with operational work. Where contracts touch ports, critical infrastructure or government programmes, liability, confidentiality and incident-response obligations can be as important as technical competence. This gives established SMEs an advantage when they already understand tendering, documentation and audit trails, but it also raises the cost of entering the market for newer specialists.
The local market appears likely to remain services-heavy, with demand shaped by maritime operations, infrastructure protection and national-security procurement cycles. Scale-ups may be scarcer than in software-led sectors, because buyers tend to value delivery history, accreditation habits and known subcontracting arrangements. New entrants can still find room in specialist engineering, cyber assurance and operational support, but sales cycles are likely to stay slow where clearance, evidence and liability checks are involved. Consolidation may occur around firms that can combine technical depth with dependable field delivery, while smaller consultancies continue to serve narrow advisory or support roles.
30
Active firms
2026
6
Above £5M
Revenue threshold
2
Recent incorporations
Since 2022
Key facts
About 20% of the trading cohort reports turnover above £5M (6 of 30 firms) — the rest sits below that revenue band.
6% of the cohort was incorporated since 2022 (2 firms), so a sizeable share is in its first few filing cycles.
Southampton’s defence suppliers sit at the overlap of security services, specialist engineering and maritime operations.
Defence procurement tends to favour assured suppliers able to support operational work near national-security and maritime customers.
The local cohort is weighted more toward services and engineering than standalone defence technology products.
Top Southampton Defence companies
Will-Burt
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsManufactures telescopic masts, mobile tower and elevation systems, lighting towers, surveillance and camera positioning equipment, and secure storage containers. Products support military, emergency…
Sells to public-sector and B2B buyers in defence, border security, firefighting, law enforcement, emergency response, transport infrastructure, communications and surveillance integration.
Financial Health
StableStable · 0% CAGR over 1y
Location
CRITICAL SOFTWARE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides software engineering and IT consultancy for safety‑ and mission‑critical systems. Services include systems and software development, verification and validation, testing, cybersecurity, AI…
Serves enterprise and public-sector organisations in safety-, mission- and business-critical sectors, including aviation, automotive, defence, energy, finance, government, insurance, medical devices,…
Financial Health
WeakWeak · -6% CAGR over 4y
Location
ARA Health Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsConducts research and engineering for health and human safety, including bioaerosol and applied microbiology studies, physiological modelling and testing, and development of medical and…
Serves government and defence agencies, public-sector bodies, and organisations in infrastructure, health research, energy and environmental sectors.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Symetrica
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures radiation detection and identification systems for security and defence applications, including handheld devices, backpacks, vehicle-mounted units and portal scanners. Also…
Serves government, law enforcement, military and security agencies, plus operators of borders, ports, airports, cities, events, scrap metal facilities and research sites needing threat detection…
Financial Health
DistressedDistressed · -8% CAGR over 4y
Location
Roke Manor Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops defence and security technologies including AI analytics, cybersecurity tools, electromagnetic spectrum systems, autonomous and robotic platforms, and specialised sensors. Provides…
Serves defence, security and industrial B2B and public sector buyers, including MOD and other government agencies, military users, and organisations needing cyber, intelligence, AI, autonomy, sensors…
Financial Health
StableStable · 0% CAGR over 4y
Location
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops software for defence and security networks that enables digital interoperability between devices, platforms and systems in the battlespace. Provides products for data exchange, system…
Serves defence and security organisations, military operators, government agencies, and defence technology partners needing interoperability across battlespace systems, platforms and devices.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
Location
Mabway Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides military training support including live simulation and special effects for exercises, along with manpower provision, logistics support, communications services, and systems engineering for…
Sells primarily to defence and military organisations, government and public sector bodies, and also serves health, nuclear, energy, space, public safety, manufacturing, agriculture and transport…
Financial Health
HealthyHealthy · Profitable · 0% CAGR over 4y
Location
Cunning Running Software Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops specialised 2D and 3D mapping and mission‑planning software for military, police and emergency services. Products support force protection, counter‑terrorism planning, missing‑person search…
Serves public-sector and defence users, including military force-protection teams, police and counter-terrorism units, missing-person search managers, counter-drone security planners, and air…
Financial Health
StableStable · -4% CAGR over 4y
Location
MILUX LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides product design and delivery consulting for defence organisations, including user research, capability assessment, concept prototyping, delivery planning, human factors integration, tactical…
Serves defence-sector organisations, including the MOD, British Army and other public-sector defence bodies, plus early-stage start-ups and major defence primes.
Financial Health
HealthyHealthy · Hiring · 26% CAGR over 4y
Location
IDS INGEGNERIA DEI SISTEMI (UK) LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -68% CAGR over 4y
Location
SMI
Designs and manufactures pressure‑moulded cable systems, connectors, through‑hull penetrators and cable harnesses for use in aerospace, defence, marine and energy infrastructure. Provides bespoke…
Serves defence and aerospace primes, naval and submarine programmes, renewable/offshore energy operators, marine exploration firms and public-sector military buyers working on hostile-environment…
Location
FIBREGENCE LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsDesigns and manufactures pressure‑moulded cable systems, electrical connectors, through‑hull penetrators and cable harness assemblies for submarines, naval vessels, aircraft and offshore energy…
Serves defence and aerospace primes, naval and public-sector buyers, offshore energy operators and infrastructure platform designers operating in hostile environments, including submarines, surface…
Financial Health
StableStable
Location
MULTIPLE ACCESS COMMUNICATIONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops software-defined radio and advanced signal processing technologies for wireless communications, electronic sensing and spectrum monitoring. Provides research, design and engineering services…
Serves security, defence and space organisations, including product development teams needing wireless communications, electronic sensing and spectrum survey expertise, from requirements through…
Financial Health
StableStable · -78% CAGR over 3y
Location
SMI
Designs and manufactures pressure‑moulded cable systems, connectors, penetrators and cable harnesses for use in submarines, ships, aircraft and energy infrastructure. Also provides engineering,…
Serves defence and public-sector naval programmes, aerospace OEMs, offshore and renewable energy operators, marine exploration firms and transport infrastructure platform designers operating in…
Location
Roke
Develops defence and security technologies including AI analytics, cyber security systems, autonomous and robotic platforms, electromagnetic spectrum and signals intelligence tools, and specialised…
Sells primarily to defence, national security and government buyers, plus organisations in regulated and critical sectors needing cyber, AI, intelligence, communications, autonomy and sensing…
Location
SOTERIA DEFENCE AND SECURITY LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides defence and security consultancy including trials planning and conduct, capability development support, bid preparation, and specialist advice for land and law enforcement programmes. Also…
Serves defence and security organisations, government framework buyers, law enforcement agencies and specialist user communities, including defence industry clients involved in procurement,…
Financial Health
HealthyHealthy
Location
MARINE ELECTRONIC SYSTEMS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies, integrates and installs marine electronic systems including navigation and integrated bridge systems, radio communications, CCTV and video surveillance, internal communications, and marine…
Serves B2B and public-sector maritime customers, including naval and coastguard organisations, offshore oil and gas operators, submarine projects, refit and upgrade programmes, and small craft…
Financial Health
StableStable · -68% CAGR over 4y
Location
SOUTH MIDLANDS COMMUNICATIONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures specialist masts, antennas and radio frequency communications equipment, including telescopic and pneumatic masts, baluns, combiners and couplers. Provides custom design, manufacturing…
Serves public-sector and commercial organisations worldwide, especially defence forces, security agencies, emergency services, governments, telecoms, utilities, transport, meteorological and…
Financial Health
StableStable · Hiring · 11% CAGR over 3y
Location
LANDGUARD NEXUS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures custom intelligence, surveillance, target acquisition and reconnaissance (ISTAR) radio systems and software‑defined radios. Supplies modular radio hardware and software for…
Serves government, defence and law enforcement organisations worldwide, including military and security teams with ISTAR and mission-critical radio system requirements.
Financial Health
DistressedDistressed
Location
ROBOSYS AUTOMATION LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDevelops artificial intelligence software for maritime autonomy, including VOYAGER AI systems that enable remote control and autonomous navigation of vessels. Provides collision avoidance,…
Sells to B2B and public sector marine operators, system integrators and vessel manufacturers, especially in government and defence, hydrography, offshore and renewables, and workboats seeking…
Financial Health
HealthyHealthy · Hiring · 28% CAGR over 4y
Location
Advanced Embedded Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides rugged embedded computing hardware including VPX chassis, mission computers, FPGA signal processing modules, data recorders, networking interfaces, storage modules, and avionics bus…
Sells to B2B and defence-sector buyers needing rugged embedded computing, including aerospace, avionics, military and high-performance signal processing teams. Targets engineers, system integrators…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
METOCEAN TELEMATICS (U.K.) LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides satellite communication and telemetry equipment, including satellite phones, modems, beacons, and tracking devices. Supplies airtime services and IoT connectivity, along with systems for…
Serves organisations in marine, environmental research, defence and security sectors, including vessel operators, wildlife and polar researchers, oil spill/weather monitoring teams, naval forces and…
Financial Health
WeakWeak · -69% CAGR over 4y
Location
CAMPRO-JECT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures surveillance cameras, video systems, transmitters and lithium‑ion battery solutions. Provides rugged equipment and bespoke micromechanical and electronic systems for police,…
Serves police, military, industrial and environmental sector customers across the UK and Europe, including Special Forces, SWAT teams, law enforcement agencies, army users and production-line…
Financial Health
DistressedDistressed · 0% CAGR over 2y
Location
INCAT CROWTHER (UK) LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides naval architecture, marine engineering and vessel design services. Develops high‑speed ferries, workboats, patrol vessels, yachts and other specialised ships, supporting clients with concept…
Serves commercial vessel operators, shipyards, ferry and tourism fleets, offshore wind and workboat operators, yacht clients, and defence or security agencies seeking passenger, utility, patrol and…
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 2y
Location
VADATECH LTD.
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures embedded computing hardware including processor boards, FPGA modules, and chassis and rack systems. Provides system integration, custom hardware development, environmental…
Serves B2B customers in aerospace, defence, commercial and industrial sectors, including DoD prime contractors and engineering teams needing embedded computing platforms and integrated hardware…
Financial Health
StableStable · 0% CAGR over 2y
Location
ST. CROSS ELECTRONICS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures custom cable assemblies, wiring looms and wire harnesses for sectors including defence, aerospace, medical and motorsport. Provides design for manufacture support, prototyping and volume…
Serves B2B buyers in high-reliability sectors including defence, medical, aerospace and motorsport/F1. Targets engineering, procurement and manufacturing teams needing custom cable assemblies and…
Financial Health
StableStable · -2% CAGR over 2y
Location
Connexion Technologies
Provides engineering design and advanced manufacturing services, including electronics, RF and microwave systems, and power electronics. Develops and produces high‑reliability components and…
Serves B2B customers in energy and utilities, communications, defence, transportation, medical, test and instrumentation, aerospace and space, including global OEMs, Tier 1 suppliers, defence…
Location
HAMBLE AEROSTRUCTURES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -69% CAGR over 4y
Location
Polycatuk Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops dry powder formulations for absorption and detoxification of hazardous chemical liquids, including chemical warfare agents. Supplies Spill‑CAT products in field deployment formats and…
Serves defence teams, military buyers, emergency responders, hazardous-materials units, industrial manufacturers, logistics/storage operators, farms and research laboratories handling chemical agents…
Financial Health
WeakWeak · -9% CAGR over 2y
Location
ADARGA LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops artificial intelligence software for intelligence and research analysis. Its Adarga Vantage platform aggregates and analyses open‑source and internal data, providing automated extraction,…
Serves public-sector defence, national security and justice organisations, plus private-sector commercial enterprises with analyst teams handling large volumes of in-house and open-source information.
Financial Health
StableStable · Hiring · 16% CAGR over 4y
Location
Accuracy
Designs and manufactures precision bolt‑action rifles for sporting shooting, long‑range competition, and military or law enforcement use. Product range includes AT‑X, AXSR and ELR rifle systems, with…
Serves civilian sporting shooters, professional firearms users, and military/defence customers in the UK, USA and international markets, subject to export controls.
Location
D A BENHAM ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision engineering and CNC machining of complex components, sub-assemblies and kits of parts for the aerospace, defence, and oil and gas industries, using advanced machine tools and…
Serves B2B customers in aerospace and defence supply chains, particularly OEMs, plus organisations in the oil and gas sector with requirements for precision-engineered components, assemblies and kits.
Financial Health
StableStable · -65% CAGR over 4y
Location
AVIEX LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
K & P WESTBROOK LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak
Location
Rivers Engineering Company (Winchester) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures precision machined components and assemblies for aerospace, defence, nuclear, space and electronics sectors. Provides prototyping, small-batch production and project management, working…
Serves B2B clients in aerospace, space, electronics, defence and civil nuclear sectors, including organisations needing traceable, quality-accredited supply for prototypes, small-batch production and…
Financial Health
WeakWeak · Hiring · 17% CAGR over 2y
Location
ACCELERATED SOLUTIONS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
WILSON MANUFACTURING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision engineering services including CNC mill-turn, milling and turning to produce complex machined components and sub-assemblies. Also offers CAD design, fabrication coordination and…
Serves B2B customers in engineering-led sectors, including aerospace, defence, oil and gas, marine, automotive, motorsport and medical, from development projects to larger production batch…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 4y
Location
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How Southampton Defence companies work and how to sell to them
What they do
Southampton defence suppliers usually earn revenue through labour-backed delivery: fixed-price engineering work packages, day-rate technical consultancy, managed security services, systems integration and ongoing support contracts. Software may be part of the offer, but the commercial unit is often an assured service or project outcome rather than a self-serve licence. Pricing tends to reflect clearance requirements, site work, documentation burden and liability exposure. Gross margin depends on utilisation, subcontractor control and the ability to keep cleared specialists billable between framework call-offs and programme phases.
Who they sell to
Customers are typically government teams, defence-prime supply chains, port and maritime operators, and commercial organisations with security-sensitive assets. Day-to-day sponsors are often programme managers, security leads, engineering directors, operations heads and procurement officers, with finance and legal joining when liability, indemnity or framework terms are material. Smaller assignments may start through direct relationships or subcontractor referrals; larger opportunities tend to move through approved supplier lists, framework competitions, tender portals and evidence-heavy procurement. Sales cycles are usually measured in months rather than weeks because buyers need confidence on vetting, continuity, insurances and delivery history before appointing a supplier.
What they buy
Most defence firms tend to spend on tools and services that protect delivery capacity and auditability. Relevant categories include bid management, CRM, contract management, project accounting, resource planning, time recording, secure document handling, cyber monitoring, vulnerability testing, identity controls, managed IT, cloud hosting, quality management, health and safety, HR, payroll, training, recruitment and legal support. Services purchases often matter as much as software: security accreditation advice, tender-writing support, subcontractor due diligence, export-control guidance and specialist insurance broking can all sit close to revenue. Suppliers that reduce admin around assurance, mobilisation or utilisation have a clearer route into budget than generic office productivity pitches.
Why and how to sell to them
Defence buyers tend to evaluate vendors when a contract award stretches delivery capacity, a framework renewal demands fresh evidence, a security review exposes control gaps, or a programme moves from advisory work into field delivery. Other triggers include new operations leadership, a bid into government procurement, reliance on subcontractors, or recruitment for cleared technical roles. Outbound messaging usually needs a narrow operational hook: fewer failed tenders, faster mobilisation, cleaner audit trails, lower subcontractor risk, better utilisation of scarce specialists or clearer incident-response evidence. Claims should be specific to the buyer's contract environment, because this market is sceptical of general change-management language and will ask how a supplier handles assurance, confidentiality and continuity.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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