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Electronics Companies in London: 300+ Active Firms (2026)
Electronics manufacturers design, assemble and test electronic equipment and components for regulated UK markets from London bases.
Buying centres tend to sit with engineering, operations, quality and procurement teams rather than a single software-style budget holder. Customer types range from industrial equipment makers and infrastructure suppliers to medical, communications and specialist consumer-product businesses, usually on B2B terms. Engagements are often project-led at the start: design-for-manufacture input, prototype assembly, certification preparation, test work and low-volume production runs. Longer relationships tend to move into repeat builds, component supply or outsourced assembly, with purchase decisions shaped by traceability, documentation discipline, lead times and the buyer’s tolerance for supply-chain risk.
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London has 301 electronics manufacturers actively trading, with 2,504 people in reported headcount. The city’s cohort is therefore visible, but not a mass-volume manufacturing base; it reads more like a set of specialist engineering, assembly and testing businesses serving buyers that need proximity to product development, regulated sales channels or technical procurement teams. The capital also gives these firms access to industrial, communications, medical and infrastructure customers, although production work itself tends to be judged on documentation, repeatability and delivery reliability rather than location alone.
Regulation is activity-based rather than built around a single sector licence. Electrical and electronic equipment can bring restrictions on hazardous substances, conformity documentation, declarations, labelling and conformity marking into the manufacturing process, with OPSS enforcement. Depending on the product, firms may also have to work through electrical equipment safety, electromagnetic compatibility and radio equipment regimes. Waste responsibilities sit alongside market access: producers placing EEE on the UK market register annually, with the registration route depending on the quantity placed on the market. For London manufacturers, the practical burden tends to sit in documentation, supplier assurance and role clarity across design, assembly, testing and placing products on the market.
Buyer scrutiny appears unlikely to ease, particularly where electronics sit inside regulated equipment, infrastructure or communications systems. The London cohort tends to suit smaller-batch, engineering-led work where technical assurance matters as much as unit cost, rather than commodity production. Scale-up paths may remain uneven: some firms can deepen customer relationships through repeat assembly and test programmes, while others stay tied to project cycles and component availability. Compliance work also favours businesses with disciplined documentation and supplier control, so consolidation may come through capability gaps as much as through demand expansion.
301
Active firms
2026
45
Over £5M turnover
London cohort
59
New since 2022
London cohort
Key facts
About 14% of the trading cohort reports turnover above £5M (45 of 301 firms) — the rest sits below that revenue band.
19% of the cohort was incorporated since 2022 (59 firms), so a sizeable share is in its first few filing cycles.
In-scope electrical and electronic equipment under the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 needs technical documentation, a Declaration of Conformity, required labelling and the relevant conformity marking, with OPSS enforcing the rules.
Organisations placing more than 5 tonnes of EEE on the UK market must join a producer compliance scheme; those below 5 tonnes can register annually as small producers.
The UK electronics sector reached £16.1 billion of value added in 2024, up from £4.1 billion in 2000.
Electronics and electrical equipment together account for 10% of UK manufacturing value added and 13% of UK manufacturing exports.
By 2022 value added, UK electronics ranked fifth among the G7 plus China, behind China, the USA, Japan and Germany.
Top London electronics companies
Surface Technology
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides contract electronics manufacturing and engineering services including electronics design, printed circuit board assembly (PCBA), prototyping, production and full box-build manufacturing.…
Serves B2B customers in aerospace, defence and security, including organisations developing complex, high-reliability electronic products requiring contract manufacturing, engineering support and…
Financial Health
WeakWeak · -9% CAGR over 2y
Location
LM Technologies Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures Bluetooth and Wi‑Fi modules, adapters and combo boards for embedded and connected devices. Also provides evaluation kits and engineering services including hardware design,…
Sells to B2B customers including OEMs, product developers and distributors in audio, automotive, building systems, gaming, facility management, industrial automation, medical, retail/POS and smart…
Financial Health
HealthyHealthy · -22% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures medical equipment for hospitals, including patient monitors, ICU ventilators, electrocardiographs, central monitoring stations and cardiac telemetry systems. Also provides…
Serves hospitals and clinical centres worldwide, particularly intensive care, anaesthesia, cardiology and telemedicine departments, and partners with medical equipment distributors and clinical…
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
European Circuit Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures printed circuit boards and provides PCB assembly services, including SMT and PTH assembly, BGA placement, cable and harness assembly, component procurement, testing,…
Serves B2B electronics customers, including OEMs, engineering teams and product developers needing PCB-related support from prototypes to low- and medium-volume production.
Financial Health
WeakWeak · 2% CAGR over 4y
Location
Wayne Kerr Electronics
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electronic test and measurement instruments for analysing electrical components, including impedance analysers, magnetics and transformer analysers, DC bias current units,…
Serves B2B electronics engineers, component manufacturers, transformer and magnetics producers, and test laboratories buying component measurement instruments and accessories.
Financial Health
DistressedDistressed · -6% CAGR over 4y
Location
Nicomatic
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electrical and fibre‑optic connectors, cable assemblies and human‑machine interface components. Provides custom interconnection systems, testing services and integrated…
Serves engineering and procurement teams at high-tech OEMs and systems integrators in defence, aerospace, space, drones, medical, transport, energy, robotics and automation.
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
European Safety Systems Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures audible and visual signalling devices for hazardous, fire and industrial environments, including alarm sounders, sirens, horns, loudspeakers, beacons, strobes, manual call…
Serves B2B customers in commercial, industrial, fire safety, marine, onshore and offshore sectors, especially operators and contractors managing ordinary or hazardous sites.
Financial Health
StrongStrong · Hiring · 9% CAGR over 4y
Location
KEY Tech
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides electronic manufacturing services including surface mount and through‑hole PCB assembly, prototyping, box build and system integration, cable assemblies, conformal coating, and inspection…
Serves B2B engineering teams, product developers and manufacturers in mission-critical sectors, including defence, medical and healthcare, energy/oil and gas, marine and subsea, rail and…
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
Standex Electronics (U.K.)
Designs and manufactures precision‑engineered electronic components including reed switches, sensors, relays, transformers, and custom magnetic components. Supplies parts for automotive, industrial,…
Serves B2B engineering and procurement teams at OEMs and manufacturers in automotive, industrial automation, test and measurement, energy and utilities, aerospace, medical and military markets.
Location
Magic Tech Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures printed circuit boards (PCBs) and provides PCB assembly services, including SMT and BGA assembly, prototype and low‑volume production, PCB design and layout, component sourcing, and…
Targets businesses developing electronic products, including OEMs and manufacturers in automotive, consumer electronics, industrial equipment, LED lighting, security, medical, aerospace, military,…
Financial Health
StrongStrong · Hiring · 29% CAGR over 2y
Location
OMC (GB) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures optoelectronic components and lighting products, including fibre optic cables and assemblies, LED backlights, optical mouldings, high‑power LEDs, displays, fibre optic…
Sells to B2B customers such as electronics OEMs, design engineers, product developers and lighting specifiers working on industrial, commercial and equipment-display applications.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures specialised industrial light sources including UV, infrared and xenon lamps, UV LED modules, laser diodes and lighting components. Products are used in applications such as curing,…
Serves B2B industrial customers and OEMs across advanced manufacturing, semiconductors, printing, healthcare, food treatment, inspection, plant lighting and sports facilities with specialised…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
RAPISCAN SYSTEMS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops and manufactures security screening and inspection systems for aviation, border control, and infrastructure security. Products include X‑ray and CT scanners, metal detectors, trace and…
Serves security-sensitive public-sector and commercial organisations, including airports, customs and border agencies, ports, law enforcement, critical infrastructure operators, event security teams,…
Financial Health
HealthyHealthy · -78% CAGR over 3y
Location
RADIALL LTD
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures electronic interconnect components including RF coaxial connectors, cable assemblies, fiber optic connectors, antennas and microwave switches. Products are used in aerospace,…
Serves B2B engineering and procurement teams at aerospace, defence, rail, medical, space, telecom, industrial, test and measurement, and quantum technology organisations, including OEMs and…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
OXDEVICE LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns, develops and manufactures medical devices for healthcare companies. Services include endovascular and neurovascular device development, medical sensors, device coatings, cleanroom and…
Serves medical device companies, startups and university spin-outs developing new healthcare products, particularly teams working on endovascular, neurovascular, sensor and implantable device…
Financial Health
StableStable · Hiring · 17% CAGR over 2y
Location
Peak Production
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures automated test equipment (ATE) and related hardware. Provides custom test systems, adaptors and fixtures, cable harnesses, and prototype wiring, alongside electrical and…
Serves B2B engineering and manufacturing organisations in aerospace and defence, automotive, industrial and medical sectors, including teams requiring automated test equipment, fixtures, cable…
Financial Health
StableStable · 2% CAGR over 4y
Location
New Circuit Test Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures custom electronic test equipment and fixtures for printed circuit boards and electronic products, including in-circuit, functional, in-line and high-temperature test…
Serves major OEMs, multinational electronics manufacturers and the wider electronics manufacturing sector needing PCB and electronic product test and production support globally.
Financial Health
HealthyHealthy · -2% CAGR over 3y
Location
LA TECHNIQUES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electronic test and measurement equipment for optical and microwave communication systems, including vector network analyzers, reflectometer modules, signal generators and…
Serves B2B customers in RF, microwave and optical communications, including test-and-measurement engineers, R&D teams and OEM manufacturers needing benchtop, handheld or embedded network analysis…
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
LITEPLAN LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures emergency lighting components, including conversion kits, control gear and dedicated emergency light sources. Supplies OEM lighting manufacturers and provides technical…
Serves OEMs in the lighting industry, particularly manufacturers supplying hospitality, healthcare, education, retail, industrial and commercial building markets.
Financial Health
StableStable · -62% CAGR over 5y
Location
EUROPEAN ENGINEERING & CONSULTANCY LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides engineering consultancy, design and manufacturing of RF and microwave electronic hardware for aerospace, scientific and industrial applications. Develops products such as switch matrices,…
Serves B2B customers in space, aerospace, high-technology science, defence and industrial markets, including organisations needing specialist RF, microwave and electronic engineering support for…
Financial Health
HealthyHealthy · Growing, Hiring · 7% CAGR over 2y
Location
TREASURE FORTUNE (UK) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures building management system (BMS) control peripherals including temperature, humidity and CO2 sensors, control interfaces and displays. Designs and produces bespoke sensing, measurement…
Targets B2B buyers in the building services and building management systems sector, with end markets spanning residential, retail, hotel, commercial and industrial buildings.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
VIGORTRONIX LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures transformers, power supplies, and wound magnetic components for electronics applications. Provides standard and custom-designed products, along with UK manufacturing and supply chain…
Serves B2B electronics buyers and OEMs with low-, medium- and high-volume requirements across audio, industrial, renewable energy, medical, EV/mobility and education markets.
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 2y
Location
DRUCEGROVE LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures electronic components for lift systems, including TFT position indicators, multimedia displays, speech announcers, gongs, lanterns, controller interfaces and rope tension…
Serves B2B customers in the lift industry, including lift manufacturers, installers, modernisation contractors and maintenance providers working on passenger lifts in commercial and residential…
Financial Health
WeakWeak · -5% CAGR over 2y
Location
SMI Group Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures pressure‑moulded cable systems, connectors, penetrators and cable harness assemblies for aerospace, defence, marine and energy infrastructure. Provides engineering, supply…
Serves defence and naval organisations, aerospace manufacturers, offshore and renewable energy operators, and marine/transport infrastructure platform designers needing cable and connector systems…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
OUTRAM RESEARCH LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures power quality monitoring equipment including three‑phase power quality analysers, harmonic and flicker monitors, and real‑time fault level monitoring devices. Provides…
Serves B2B power-sector customers, including utilities, electrical engineers, consultants and industrial or commercial sites working with power quality, harmonics, flicker and ENA/IEC compliance…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
OSI Electronics (UK) Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electronic manufacturing services for OEMs, including electronic and mechanical design support, fast‑track prototyping, printed circuit board assembly, box‑build and sub‑assembly…
Serves OEMs and high-tech businesses across multiple market sectors, particularly engineering and product teams requiring scalable local-to-global manufacturing support, NPI capacity, and worldwide…
Financial Health
HealthyHealthy · Profitable, Hiring · 6% CAGR over 3y
Location
HIGHTEST TECHNOLOGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electrical test equipment for power systems, including transformer ratio testers, winding resistance testers, circuit breaker analysers, contact resistance testers, primary…
Sells to electrical power utilities, substation operators, transformer manufacturers, maintenance contractors and commissioning engineers needing high-voltage equipment testing and calibration…
Financial Health
HealthyHealthy · Hiring · 57% CAGR over 4y
Location
HIND (UK) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electronic manufacturing and assembly services, including engineering support, prototype builds, surface‑mount and conventional PCB assembly, box build, inspection and testing, material…
Serves OEMs, product developers and engineering-led businesses across diverse sectors that need outsourced electronics manufacturing and assembly support.
Financial Health
StableStable
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides precision manufacturing and engineering services including CNC machining, sheet metal fabrication, and electromechanical assembly and testing. Produces metal, plastic, ceramic and quartz…
Serves B2B OEMs and manufacturers in the semiconductor, life sciences, electronics, aerospace and medical sectors, especially teams sourcing precision components, modules and complex systems from…
Financial Health
StableStable · Hiring · 31% CAGR over 3y
Location
LEM Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electrical measurement components including current and voltage sensors, Rogowski coils and energy meters. Supplies sensing solutions used in automotive systems, EV chargers,…
Serves B2B engineering and procurement teams at OEMs and system integrators in automotive electrification, EV charging, smart grid, renewable energy, industrial automation, welding, traction and…
Financial Health
DistressedDistressed
Location
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsDesigns and manufactures LED lighting for hazardous and industrial environments, including ATEX Zone 1 and Zone 2 area lights, floodlights, bulkheads and portable luminaires. Also provides lighting…
Sells to B2B industrial operators and distributors in hazardous or harsh-environment sectors, including manufacturing plants, automotive sites, machining facilities, steel producers, sewerage…
Financial Health
WeakWeak · 0% CAGR over 1y
Location
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures electromagnetic geophysical instruments used for subsurface surveying in geological, environmental, geotechnical, and unexploded ordnance (UXO) detection applications, and…
Serves geophysical survey firms, environmental and geotechnical consultants, geological researchers, and UXO detection teams in commercial, academic, and public-sector markets.
Financial Health
StrongStrong
Location
CURSEY TECHNOLOGY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides contract electronics manufacturing services including PCB assembly (SMT and through‑hole), box build and electro‑mechanical assembly. Offers electronics design, product development,…
Serves B2B customers outsourcing electronics design or manufacturing, including scientific and laboratory instrumentation firms, medical device companies, aerospace suppliers, communications…
Financial Health
StableStable · -10% CAGR over 5y
Location
CHEVALIER TECH LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns and develops automotive electromechanical systems, including power actuators, safety‑critical mechanisms, access control systems, smart door handles, and electronic control units, integrating…
Targets automotive-sector businesses, especially vehicle manufacturers, suppliers and engineering teams involved in safety-critical, access control and electromechanical product programmes.
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 3y
Location
Quality Monitoring Instruments Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures oil mist detection systems used to monitor engines and machinery spaces. Products include crankcase detectors, atmospheric sensors and monitoring units for marine, industrial…
Serves B2B marine and industrial operators managing engine rooms, machinery spaces, pump rooms, hydraulic areas, test cells and large diesel engine sites needing safety monitoring.
Financial Health
StableStable · 0% CAGR over 3y
Location
CLEVERTRONICS INTERNATIONAL UK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and supplies emergency and exit lighting products, including illuminated exit signs, emergency luminaires and battery-backed lighting systems, along with automated monitoring…
Serves B2B and public-sector customers, including specifiers, contractors and facilities teams for stadiums, healthcare, retail, education, transport, heritage and public-site projects.
Financial Health
StableStable · -66% CAGR over 4y
Location
SKARDIN INDUSTRIAL (UK) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures consumer electronics for broadband and pay‑TV sectors, including IPTV and OTT set‑top boxes, satellite receivers, conditional access modules, smart home IoT devices, audio…
Serves B2B customers including pay-TV operators, telecom providers and electronics retailers, from major global players to smaller retail buyers in set-top box, broadband and smart-home markets.
Financial Health
WeakWeak · -8% CAGR over 4y
Location
ANDERS ELECTRONICS PLC
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and supplies LCD and OLED displays, touch interfaces, embedded computing hardware and industrial IoT gateways. Provides product development services including firmware, optical and mechanical…
Serves B2B OEMs and product development teams in industrial automation, medical and wellness, home appliances, retail signage, agritech, utilities/smart metering, EV charging and marine sectors…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
Octillion Group Holdings Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns and manufactures lithium‑ion battery systems for electric vehicles, commercial vehicles, marine and off‑highway equipment, and grid energy storage. Provides customised battery packs and…
Sells to tier-1 manufacturers and operators in EVs, passenger and commercial vehicles, trucks, buses, marine, off-highway industrial equipment, and grid energy storage markets worldwide.
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
B W Electronics Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electronics contract manufacturing and design services, including printed circuit board procurement, component sourcing, surface‑mount and through‑hole PCB assembly, wiring and system…
Serves UK-wide B2B customers and OEMs in electronics-heavy sectors, including medical instrumentation, EMC/Tempest, non-classified military, oil and downhole analytics, automotive, fuel pump systems…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Sanmina
Provides electronics manufacturing services for OEMs, including product design and engineering, PCB fabrication and assembly, precision machining, cable and enclosure manufacturing, testing, supply…
Serves high-technology OEMs and product companies in communications, cloud computing, industrial, medical, automotive, defense, aerospace, clean technology, computing/storage, multimedia and oil and…
Location
Trajectory
5y · 2020–NowManufactures fire detection and alarm systems, emergency lighting, and related life‑safety equipment for commercial and industrial buildings. Product range includes sensors, control panels, beam and…
Serves building owners, facilities teams, fire-safety installers, consultants, architects and specifiers across commercial, industrial and public-sector sites, including care homes, education,…
Financial Health
Insufficient historyInsufficient history
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures scientific instruments for water quality monitoring, including multiparameter probes, water level and temperature loggers, sensors, and telemetry systems. Equipment measures parameters…
Serves B2B and public-sector customers needing water monitoring, including environmental agencies, consultants, aquaculture operators, mining, marine and construction firms, and education/research…
Financial Health
StableStable · -7% CAGR over 4y
Location
Panorama Antennas Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns and manufactures RF antenna systems and related accessories for wireless communications. Product range includes cellular, 5G, Wi‑Fi, GNSS, LPWA and VHF/UHF antennas, plus mounting hardware,…
Serves B2B and public-sector buyers in public safety, transport, enterprise networking, industrial IoT, utilities, mobile networks, and military/defence communications.
Financial Health
StableStable · Profitable · 1% CAGR over 1y
Location
Thames Gateway Manufacturing Centre Limited
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides contract electronics manufacturing services including surface-mount (SMT) and PCB assembly. Offers prototyping, design support, and manufacturing capabilities with inspection and quality…
Serves B2B customers needing outsourced electronics manufacturing partnerships, including firms requiring PCB/SMT assembly, prototyping and design support.
Financial Health
HealthyHealthy · -14% CAGR over 5y
Location
Luminite Electronics Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures electronic security and alert systems, including wireless PIR detectors, vape sensors, fire and lockdown alert systems, receivers and control units, and wireless switching and…
Serves B2B security distributors, approved installers and organisations needing premises security and critical-alert systems, including education, public venues and commercial sites.
Financial Health
StableStable · Hiring · 100% CAGR over 4y
Location
SEDGEWALL LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electronic manufacturing services including prototyping, contract manufacturing and assembly of electronic and electro‑mechanical products. Also designs and supplies communications and…
Serves B2B and public-sector customers in defence, aerospace, maritime, emergency services, telecoms and specialist electronics, including engineering teams and procurement buyers with prototype to…
Financial Health
StableStable
Location
Hughes Electronics Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and supplies passive transmission equipment for mobile telecommunications networks, including fibre optic and coaxial cables, hybrid power and fibre systems, connectors, RF…
Serves B2B customers in the mobile telecoms sector, including cellular network infrastructure operators, DAS deployment teams, telecoms engineers and contractors.
Financial Health
StableStable
Location
Konrad-Technologies UK Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and integrates automated test and measurement systems for electronics and sensors used in industries such as automotive and aerospace. Supplies PXI‑based testers, hardware‑in‑the‑loop…
Serves B2B engineering, R&D and manufacturing teams needing test and automation capabilities, with emphasis on automotive, aerospace and defence, consumer electronics, medical, industrial automation…
Financial Health
WeakWeak · Hiring · 21% CAGR over 4y
Location
ANR MANUFACTURING LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides subcontract electronics and precision engineering manufacturing, including PCB assembly, cable assembly, box build assembly, and CNC milling and turning. Offers product design support,…
Serves B2B customers, including blue-chip companies and OEMs across the UK, needing low-to-medium volume electronics and precision engineering manufacturing support.
Financial Health
StableStable · Hiring · 4% CAGR over 3y
Location
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How London electronics companies work and how to sell to them
What they do
Electronics firms usually earn from a mix of engineering service fees, non-recurring design work, prototype builds, test work and production margin. Early jobs are often quoted as fixed-price projects, with bill-of-materials costs passed through separately or bundled into a prototype price. Repeat work tends to move to per-unit pricing, framework purchase orders or cost-plus arrangements where component pricing is volatile. Some firms also sell specialist modules, assemblies or test fixtures as physical goods, with revenue tied to production batches rather than pure licence or subscription models.
Who they sell to
Most sell to engineering-led organisations rather than consumer buyers: original-equipment manufacturers, regulated equipment makers, infrastructure suppliers, communications businesses and specialist product teams inside larger groups. The first conversation often sits with a head of engineering, CTO or operations lead, before quality, procurement and finance test the supplier risk. Smaller engagements may be bought directly by project teams; production contracts usually need supplier onboarding, documentation review and purchase-order discipline. Sales cycles can be short for urgent prototype or fault-finding work, but stretch over months when qualification, certification evidence or approved-supplier status is required.
What they buy
Most electronics manufacturers tend to spend on tools that make engineering and production control less manual: electronic design automation, product lifecycle management, ERP or MRP, quality management, inventory planning, traceability, document control and calibration scheduling. Cyber security, cloud storage, back-up, accounting and CRM are relevant, but usually have to fit around production workflows rather than dominate them. Services budgets often go to compliance advice, product-safety testing, contract manufacturing support, component sourcing, freight, specialist recruitment, insurance, tax, audit and grant-writing where firms are funding new equipment or product development.
Why and how to sell to them
Electronics buyers tend to evaluate new suppliers when lead times lengthen, parts become hard to source, rework rises, a customer asks for better traceability, or a project moves from prototype into repeat production. New operations or quality hires can also reopen vendor choices, especially in London firms trying to formalise processes without losing engineering flexibility. Outbound messaging usually lands better when it names the operational failure being reduced: fewer late builds, cleaner audit trails, lower scrap, faster quoting or clearer supplier risk. Generic productivity claims are easier to ignore.
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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