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A&D Companies in Southampton: 74 Active Firms (2026)
Aerospace and defence companies in Southampton design, manufacture and support aircraft, systems and controlled dual-use equipment.
Procurement usually sits with engineering, programme, operations and commercial teams rather than a single software-style buyer. Southampton-area suppliers tend to sell into civil aviation, defence, security and space supply chains, with engagements shaped by qualification, integration risk and support obligations. The most relevant buyers are mid-market manufacturers, prime-contractor supply-chain teams, maintenance and repair operators, and public-sector or defence-adjacent procurement groups. Typical work is not transactional: design packages, certified components, mission-system integration and through-life support often require evidence of quality systems, traceability, export-control screening and the ability to keep specialist engineering capacity available through programme changes.
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Southampton has 74 actively trading A&D companies in this list, a compact local cohort rather than a broad regional manufacturing base. Reported employment totals 737 people, with all reporting firms disclosing headcount, so the visible footprint is more than a set of dormant design vehicles. The pattern fits a city-area supply chain of specialist engineering, integration and support businesses: enough operating capacity to serve aviation and defence programmes, but not the scale of a national cluster. The comparison base should stay tight: this is the local active-firm base, not a proxy for the wider UK aerospace or defence economy.
Civil aviation work brings CAA certification and continuing-airworthiness expectations, while defence and dual-use activity brings a separate export-control layer. ADS has argued that CAA rulemaking and certification authority, alignment with EASA and closer FAA cooperation matter for market access, particularly for suppliers moving parts, software or technical know-how across borders. GOV.UK guidance puts the burden on exporters to check the consolidated control list and seek Export Control Joint Unit licences where goods, software, technology, end-use concerns or sanctions require it. Unlicensed export of controlled items is a criminal offence, so compliance is a market-access condition rather than back-office paperwork.
Qualified specialists appear better placed than broad new entrants. Aerospace and defence buyers tend to reward production discipline, traceability and programme familiarity, which makes switching suppliers slower than in many industrial markets. At the same time, export screening and civil certification keep compliance costs in the foreground, especially for firms handling dual-use technology or safety-critical components. Scale-up scarcity may leave Southampton with a layered base: some larger employers, many engineering-led specialists and occasional newer firms built around technical niches. Consolidation is plausible where owners need succession options or customers want fewer suppliers.
74
Active firms
2026
8
Above £5M
reported turnover
7
Newer incorporations
since 2022
Key facts
About 10% of the trading cohort reports turnover above £5M (8 of 74 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Civil aviation safety and certification sit with the UK Civil Aviation Authority, with EASA alignment and closer FAA cooperation relevant to market access.
Defence and dual-use exporters must check the consolidated list and apply to the Export Control Joint Unit where controlled items, end-use concerns or sanctions trigger licensing.
UK defence orders reached £13.2 billion in 2024, after £11.9 billion in 2023, with annual UK defence orders averaging £9.3 billion over 2020–2024.
Aerospace products accounted for 53% of UK defence export orders over 2020–2024, making aerospace the largest defence export product category across that period.
The UK aerospace industry is export-driven, with 70% of domestic aerospace production exported in 2023.
Top Southampton A&D companies
Aero Technics (manchester)
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides maintenance, repair and overhaul (MRO) services for aircraft components, including airframe structures, composite parts, cabin interior equipment, catering units, batteries, paint and…
Serves international B2B aerospace customers, including aircraft operators and maintenance organisations requiring CAA/EASA-approved component MRO and time-sensitive AOG support.
Financial Health
StrongStrong · Hiring · 27% CAGR over 4y
Location
EXODUS ORBITALS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
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
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
1865 LLP
Trajectory
5y · 2021–NowDesigns, develops and manufactures engineered rubber components including moulded seals, gaskets and specialist mouldings. Provides rubber‑to‑metal and rubber‑to‑plastic bonding, compound and…
Serves B2B customers in aerospace, defence, engineering, manufacturing, motorsport, processing, nuclear and renewables, oil and gas, and prestige automotive sectors, including companies needing…
Financial Health
Insufficient historyInsufficient history
Location
CAV Aircraft Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
AMS 1960 Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 19% CAGR over 4y
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
K&S AEROSPACE COMPONENTS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and repairs aerospace components, offering TIG, spot, seam and orbital welding alongside turning, milling and sheet metal fabrication. Produces one-off and batch parts and provides…
Serves aerospace-sector businesses and engineering teams in the Southampton area needing one-off or batch components and component repairs.
Financial Health
WeakWeak · -5% CAGR over 2y
Location
HAMBLE AEROSTRUCTURES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -69% 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
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
RTL Materials Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures rollable composite mast systems using bi-stable reeled composite technology, including telescopic masts, tripods, integrated antenna masts, combination systems and related accessories…
Serves defence, industrial and emergency services buyers, plus distributors and organisations in sectors including telecoms, transport, nuclear, energy, rail, mining, broadcasting, environmental…
Financial Health
StrongStrong · Growing · 3% CAGR over 2y
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
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
RHH Franks Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsManufactures precision engineered components and assemblies for aerospace and related industries. Provides CNC machining, dip brazing, sheet metal fabrication, heat treatment, chemical processing,…
Serves B2B organisations in aerospace, nuclear, defence and marine supply chains, from engineering teams needing prototypes to buyers sourcing batch-manufactured components and assemblies.
Financial Health
StableStable · 5% CAGR over 1y
Location
A & J CHURCHILL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures precision‑engineered components, including gas‑turbine blades, for aerospace and power generation industries. Provides new product development, volume production and spare parts…
Serves B2B customers in aerospace, power generation and med-tech, including OEMs and Tier 1 supply chain organisations requiring precision-engineered components.
Financial Health
StableStable · Hiring · 11% 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
VERO ELECTRONICS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electronic enclosures and hardware systems, including 19″ rack cases, cabinets, Eurocard subracks, front panels, and portable metal enclosures. Provides in‑house engineering,…
Serves B2B electronics OEMs and engineering teams in aerospace, defence, automotive, transport, medical, scientific, multimedia, broadcast and telecommunications markets.
Financial Health
StableStable
Location
NKT Photonics
Develops and manufactures fiber lasers, supercontinuum white‑light lasers, ultrafast lasers, and photonic crystal optical fibers. Supplies laser modules and optical components used in scientific…
Serves R&D teams, OEMs, and research institutions in photonics-dependent sectors, including bio-imaging, semiconductor, device characterization, scientific instrumentation, quantum and…
Location
ALLSOPP HELIKITES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures tethered helium balloon‑kite aerostats (Helikites) used to lift cameras, antennas, radar and other payloads for aerial surveillance, communications, environmental monitoring…
Sells to defence and security agencies, border-control teams, emergency services, environmental researchers, communications operators, maritime users, and commercial customers in aerial photography,…
Financial Health
StableStable · -3% CAGR over 4y
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
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
Heliwork (Services) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -4% 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
Ohmspace Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops electric propulsion systems for spacecraft, including advanced resistojet technology designed to reduce propellant consumption and extend satellite mission lifetimes. Provides propulsion…
Serves B2B aerospace customers, including satellite manufacturers and operators, propulsion engineering teams, and space agencies developing electric satellite platforms and space missions, with…
Financial Health
StrongStrong · 76% CAGR over 3y
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
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
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
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
Provides air traffic control and airspace management services for commercial aviation. Develops air traffic management technology, analytics and operational tools for airports, airlines and air…
Serves airports, airlines, air navigation service providers, governments and other aviation stakeholders in the UK and internationally, including organisations involved in airspace, drones and…
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
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
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
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
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
BOWYER ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision engineering and subcontract CNC machining services, including 3‑ to 5‑axis milling and CNC turning for prototype and production components. Designs and manufactures gas turbine…
Serves B2B customers in aerospace, power generation and industrial manufacturing, including gas turbine development teams, controls integrators and firms sourcing prototype or small-to-medium batch…
Financial Health
WeakWeak · -69% CAGR over 4y
Location
Ardtully Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides precision engineering and CNC machining services, including CNC turning and milling, design for manufacture, assembly, stockholding, and subcontract treatments. Manufactures…
Serves B2B customers in defence, aerospace, automotive, medical and commercial sectors, including OEMs, tier suppliers and public-sector defence buyers needing precision-engineered components.
Financial Health
DistressedDistressed
Location
FARNBOROUGH AIRCRAFT CORPORATION LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
Provides air traffic control and airspace management services, handling commercial and other aircraft movements. Develops aviation technology, data analytics, and operational systems for airports,…
Serves airports, airlines, air navigation service providers, governments and other aviation stakeholders in the UK and internationally, including Europe, North America, the Middle East and Asia.
Location
HELISPARES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies helicopter parts and components, including starter generators, gearboxes and rotor blades, from inventory for sale or exchange. Also manages overhaul and repair of helicopter components…
Serves helicopter operators, maintainers and aviation maintenance organisations worldwide, including fleets using AS350/355/EC130 and other turbine helicopter models.
Financial Health
StableStable · -9% CAGR over 2y
Location
Symetrica
Trajectory
4y · 2020–NowDesigns and manufactures radiation detection and identification systems for security applications, including handheld detectors, backpack and vehicle‑mounted units, and fixed portal monitors. Also…
Serves government, defence, law enforcement and security agencies responsible for homeland security at borders, ports, airports and cities, plus operators in sectors such as scrap metal, event…
Financial Health
Insufficient historyInsufficient history
Location
MRO Logistics Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 32% 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
AEROTHERMAL LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures bespoke autoclaves and specialist thermal processing equipment for aerospace, motorsport, military and industrial applications. Provides process engineering, project…
Serves B2B and public-sector organisations in aerospace, motorsport, defence, electronics, tobacco, waste management and energy-from-waste, including global manufacturers, airlines, military bodies…
Financial Health
StableStable · -9% CAGR over 4y
Location
SORA RISK SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops aviation risk intelligence software that analyses global security, geopolitical and operational data to support flight planning and risk management. Provides alerting, predictive analytics,…
Serves commercial airlines, cargo carriers, business jet operators, government aviation bodies, military teams, aviation insurers, and academic researchers in aviation and security.
Financial Health
HealthyHealthy · Hiring · 23% CAGR over 4y
Location
J.T.ASH TECHNICAL LTD
Trajectory
1y · 2024–NowFinancial Health
Insufficient historyInsufficient history
Location
GILBERT AVIATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -73% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
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How Southampton A&D companies work and how to sell to them
What they do
Southampton-area aerospace and defence firms earn revenue from engineering services, component manufacture, integration work, maintenance support and specialist consultancy. Commercial models are usually built around project milestones, time-and-materials engineering, fixed-price work packages, spares, repair contracts or multi-year supply agreements. Margins depend on utilisation, qualification cost and the ability to keep technical staff available between programme phases. A small software or data element may sit inside mission systems, diagnostics or support tooling, but most propositions are still sold as engineered outputs, certified parts, test evidence, documentation packs and continuing support rather than pure subscriptions.
Who they sell to
Most suppliers sell to engineering-led buying groups inside civil aviation, defence, security and space supply chains. Typical stakeholders include engineering directors, programme managers, quality leads, procurement teams, commercial directors and, where systems or data are involved, CTO or security roles. Deals tend to move through direct sales, approved-supplier lists, technical evaluations, RFPs and framework-style procurement rather than self-serve channels. Sales cycles are often measured in months, with early conversations focused on qualification, evidence, capacity, export screening and the buyer’s confidence that a supplier can keep supporting a programme after the first order.
What they buy
Aerospace and defence firms tend to spend on systems that control traceability, quality evidence, project cost, supplier risk and technical documentation. Common buying categories include ERP and MRP, quality management, product lifecycle management, document control, secure collaboration, CRM, bid management, finance, HR and workforce planning. Operational buyers also need calibration, metrology, testing, certification support, cyber security, cloud hosting, backup, specialist recruitment, legal advice, export-control support and accounting services. Firms with production or maintenance activity may also buy facilities services, machine maintenance, health and safety support, insurance, training and logistics capability tied to regulated parts movement.
Why and how to sell to them
Buying intent often appears when aerospace and defence suppliers win a new work package, enter an approved-supplier process, prepare for a CAA-related audit, expand into export-controlled work, add engineering headcount or replace manual spreadsheets with more auditable systems. Pain points are usually practical: long qualification cycles, document burden, scarce specialist labour, margin pressure on fixed-price work, customer audits and the risk of production delays from supplier or compliance failures. Outbound messages tend to land better when they reference programme assurance, traceability, bid readiness, audit preparation, utilisation or export-control workflow rather than generic productivity claims.
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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Frequently asked questions
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