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Electronics Companies in Cardiff: 29 Active Firms (2026)
Electronics manufacturers in Cardiff design and build components, devices and assemblies for specialised markets in South Wales and the UK.
electronics companies in this list are UK-registered firms based in Cardiff matching: An ideal company manufactures electronic components, devices, assemblies or electrical equipment from Cardiff or its surrounding metropolitan area. It has roughly £4m to £15m turnover and 10 to 80 employees, with production, engineering and quality-control capability in-house. It serves specialised, knowledge-intensive markets that require reliable hardware, technical documentation, conformity assessment and product labelling. It fits UK electronics manufacturing regulations covering hazardous substances, electrical safety, electromagnetic compatibility, radio equipment and EEE producer obligations..
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This list covers 29 actively-trading electronics companies, of which 4 report turnover above £5M.
Most active firms file accounts via Companies House and report turnover and headcount through XBRL. Smaller filers (micro-entity / abridged) report less detail; figures for those are estimated from peer benchmarks.
5 firms in this cohort were incorporated since 2022, a signal of recent activity in the sector.
29
Active firms
2026
4
Above £5M
annual turnover
5
Since 2022
new incorporations
Key facts
About 13% of the trading cohort reports turnover above £5M (4 of 29 firms) — the rest sits below that revenue band.
17% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
Many types of electrical and electronic equipment in GB and NI fall under the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012.
In-scope products need technical documentation, a Declaration of Conformity, required labelling and the relevant conformity marking, with OPSS enforcing the rules.
Organisations putting EEE on the UK market must register annually as producers; the threshold between small producer registration and a producer compliance scheme is 5 tonnes.
UK electronics value added rose from £4.1 billion in 2000 to £16.1 billion in 2024, a 5.8% CAGR, compared with 1.6% for UK manufacturing overall.
Electronics and electrical equipment together represent 10% of UK manufacturing value added and 13% of UK manufacturing exports, alongside trade deficits of £29 billion for electronics and £16 billion for electrical equipment.
Top Cardiff Electronics companies
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsProvides electronics manufacturing services including PCB assembly, electronic and mechanical box build, cable and wiring harness assembly, prototyping, testing and inspection, plus design support…
Serves B2B customers developing or scaling electronic products, including organisations in military, aviation, medical and manufacturing markets, from prototype-stage teams to low-, medium- and…
Financial Health
StableStable · 0% CAGR over 2y
Location
Third Millennium Systems Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures RFID-based access control readers and credential technologies used in security and entry systems, supplying hardware and related accessories for integration with building…
Serves security-conscious businesses and organisations in the UK and overseas that need RFID access control reader and credential solutions, including customers seeking bespoke rather than…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
Elmatic (Cardiff) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures industrial electric heating elements and related components, including cartridge, immersion, tubular, ceramic and silicone heaters, as well as control panels, thermocouples and…
Serves B2B industrial customers needing custom heating elements, including aviation, automotive, energy, food processing, HVAC, offshore, packaging, petrochemical, plastics, rail, shipping and marine…
Financial Health
HealthyHealthy · 2% CAGR over 4y
Location
EM Solutions
Trajectory
5y · 2020–NowDesigns and manufactures satellite communications equipment and microwave subsystems for defence and commercial users, including naval and land‑mobile SATCOM terminals, Ka‑band amplifiers and antenna…
Serves defence and government customers, especially navies and allied military organisations, plus prime contractors in the global defence satellite communications market.
Financial Health
Insufficient historyInsufficient history
Location
CAP SOLAR PARTNERS LIMITED
Trajectory
3y · 2021–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures flexible solar panels and onboard solar power systems for vehicles including trucks, vans, boats and recreational vehicles. Provides custom integration, engineering and…
Serves B2B customers in mobility sectors, including transport and logistics fleets, boat builders/operators, recreational vehicle users, and custom van conversion companies needing on-board solar…
Financial Health
StrongStrong · Profitable, Growing, Hiring · 91% CAGR over 3y
Location
M H AUTOMATION INTERNATIONAL LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns and supplies industrial electrical control systems and automation solutions, including PLC systems, AC and DC motor control, safety-rated automation, radar collision avoidance and power…
Serves industrial businesses operating critical production cranes, especially steel plants, ports, dockyards and power generation sites, working with engineering and maintenance teams.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 3y
Location
ENVITECH LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops and supplies environmental and meteorological monitoring systems, including air quality analysers such as BTEX and VOC gas chromatographs. Provides monitoring software and distributes…
Serves organisations requiring environmental and meteorological monitoring systems, including customers for air-quality analysers and related software worldwide.
Financial Health
StableStable · 0% CAGR over 2y
Location
Graphite Alchemy Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
H.O.S INNOVATIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Lion Laboratories
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures alcohol breath analysis instruments, including portable breathalysers, rapid screening devices and vehicle ignition interlock systems. Supplies evidential testing equipment for law…
Serves law enforcement agencies, safety-critical commercial and industrial employers, medical and education organisations, and personal users worldwide needing alcohol testing and monitoring.
Financial Health
WeakWeak · -2% CAGR over 2y
Location
PAVECOST MANUFACTURING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides contract electronics manufacturing services, including PCB assembly using surface mount and through‑hole technologies, rapid prototyping, functional PCB testing, material procurement, and…
Serves B2B electronics customers, including OEMs and product developers needing outsourced PCB assembly, prototyping, testing, procurement and turnkey manufacturing support.
Financial Health
StableStable · -62% CAGR over 5y
Location
Blore Edwards Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies passive electronic components including rotary switches, potentiometers (carbon, conductive plastic and wirewound), digital encoders, control knobs and related accessories…
Serves B2B customers, including product engineers and manufacturers in audio, aerospace, defence and other industries requiring custom passive electronic components.
Financial Health
WeakWeak · -11% CAGR over 2y
Location
BIOMETRICS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures data acquisition equipment for biomedical and movement analysis research, including EMG sensors, electronic goniometers, force plates, dynamometers and accelerometers, with wireless and…
Serves B2B and institutional customers in biomedical research, movement analysis and clinical rehabilitation, including university labs, research teams and healthcare or rehabilitation providers.
Financial Health
StableStable · -70% CAGR over 4y
Location
Philtronics Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides contract electronic manufacturing services, including PCB design and surface-mount assembly, box build assembly, wiring loom and coil winding, product testing and inspection, repairs and…
Serves B2B customers needing outsourced electronics manufacturing, including product innovators, R&D-led businesses and companies in the global semiconductor and wafer fabrication sector, with…
Financial Health
HealthyHealthy · Profitable, Growing · 0% CAGR over 2y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electronics manufacturing services including PCB assembly using surface mount and through-hole processes, BGA rework, X-ray inspection, potting, and full product box build, alongside CAD…
Sells to B2B electronics manufacturers, product developers and engineering teams needing prototype-to-volume PCB builds, assembly and diagnostic support, including organisations outsourcing…
Financial Health
HealthyHealthy · 1% CAGR over 4y
Location
Fuel Cell Sensors Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures fuel cell sensors for breath alcohol analysers and transdermal alcohol detection devices. Supplies standard and quad cell sensors, OEM replacement electrodes, and bespoke…
Serves B2B OEMs and instrumentation manufacturers building breath alcohol analysers and transdermal alcohol detection devices, including firms needing bespoke component integration.
Financial Health
WeakWeak · -3% CAGR over 4y
Location
G24 POWER LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures dye‑sensitised solar cells (DSSC) that convert ambient light into electrical energy. Produces thin, flexible photovoltaic modules using roll‑to‑roll manufacturing for…
Sells to global OEMs and product manufacturers, particularly in portable consumer electronics, wireless sensors and actuators, retail display systems, and other indoor electronic or battery-powered…
Financial Health
WeakWeak · -62% CAGR over 5y
Location
TRIAX UK LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies equipment and systems for the reception, distribution and management of video, audio and data signals. Products include TV distribution systems, signal reception equipment,…
Sells B2B to installers, integrators and resellers delivering signal reception, TV distribution and IP network solutions to hospitality, residential, healthcare, care home, education and caravan park…
Financial Health
StableStable · -21% CAGR over 4y
Location
ANM ELECTRONICS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides subcontract electronics manufacturing services including low-volume, pre-production and medium to high-volume batch builds. Produces electronic assemblies for automotive and industrial…
Serves B2B customers in the automotive and industrial sectors, selling to companies that need subcontract electronics manufacturing for low-volume, pre-production, and medium- to high-volume product…
Financial Health
StableStable · -6% CAGR over 2y
Location
KR Aerotech Limited
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures precision motion control and automation equipment, including stages, actuators, motors, gantries, laser scan heads and hexapods. Provides custom multi‑axis motion systems,…
Serves B2B engineering and manufacturing teams, OEMs and research labs in semiconductor, electronics, data storage, medical/life sciences, optics/photonics, laser processing and precision…
Financial Health
StableStable · 0% CAGR over 4y
Location
LASER WIRE SOLUTIONS LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDesigns and manufactures laser-based wire processing equipment, including automated wire stripping and spool‑to‑spool systems. Also provides custom laser systems and laser processing for medical…
Sells to B2B manufacturers and engineering teams in medical devices, automotive, aerospace and defense, data centers and electronics that need precision wire processing, automation and component…
Financial Health
StrongStrong · Profitable, Growing · 2% CAGR over 3y
Location
C.MAC OPTICS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electronic manufacturing services, including printed circuit board assembly (PCBA), ceramic thick‑film circuits, wire bonding, box build, and high‑level assembly. Supports product…
Serves B2B OEMs and engineering teams in transportation/e-mobility, aerospace and defence, industrial/cleantech and medtech sectors across Europe and North America.
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
Location
SEDNA LIGHTING LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and distributes LED lighting and luminaires for industrial, commercial and signage applications, including floodlights, high-bay lights, strip lights, panel lights, recessed…
Sells B2B to lighting distributors, resellers, contractors and commercial buyers serving industrial, commercial, exterior signage, exhibition and OEM lighting projects in the UK, Europe and global…
Financial Health
WeakWeak · -12% CAGR over 2y
Location
SAPPHIRE RESEARCH AND ELECTRONICS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures electronic hardware and embedded software, including analogue and digital circuit design, PCB layout and assembly. Produces retail equipment such as checkout controllers and…
Serves B2B customers in retail and industrial control, including retailers or equipment suppliers using checkout/gate systems and manufacturers needing electronics prototyping or production support.
Financial Health
StableStable · -3% CAGR over 5y
Location
KNIGHT FIRE & SECURITY PRODUCTS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures magnetic contacts and sensors for security and fire alarm systems, including surface and flush contacts, roller shutter contacts, panic buttons, shock sensors, call points, junction…
Sells to B2B buyers in the fire, intruder alarm and access control sectors, including security installers, system integrators and distributors sourcing alarm and access control components.
Financial Health
StableStable · -7% CAGR over 2y
Location
Onyx Braking Systems (UK) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures braking and sensing components including ABS sensors, sensor extension leads and related kits for truck and trailer systems, as well as speed transducers used to measure turbine speed in…
Serves B2B buyers in the commercial vehicle and trailer sector, including manufacturers, parts distributors and fleet maintenance teams, plus power generation plants and turbine maintenance operators.
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
Designs and integrates industrial automation and control systems for manufacturing and process industries, including variable speed drive systems, PLC and SCADA controls, and electrical control…
Serves B2B industrial customers worldwide, including manufacturers, process plants, ports, energy and utilities operators, and heavy industry sites needing automation and control systems support.
Location
Industrial Automation and Control Holdings Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and integrates industrial electrical control systems, including variable speed drive systems, PLC and SCADA automation. Provides engineering consultancy, system manufacturing, installation,…
Serves industrial businesses and infrastructure operators worldwide, including manufacturers, steel and aluminium mills, ports, oil refineries, utilities, food processors, printing firms and…
Financial Health
StableStable
Location
LASER DIRECT LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
DST INNOVATIONS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops lighting and digital display technologies, including customisable Pentralux lighting systems with Bluetooth connectivity for smart devices, fabrics and garments, and Videobrix modular…
Targets B2B customers in smart textiles, garments, lighting, digital signage, entertainment and advertising, including technology partners and organisations seeking R&D-led product innovation.
Financial Health
StableStable · -18% CAGR over 2y
Location
MASTERCONTROL SYSTEMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
AMMBRO TECHNOLOGIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
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How Cardiff Electronics companies work and how to sell to them
What they do
Cardiff electronics manufacturers usually earn revenue by designing, building, assembling or testing hardware for other organisations. Income tends to come from unit sales, batch production, contract manufacturing, repair work, engineering services and non-recurring design or tooling charges. Pricing is usually built around bill-of-materials cost, labour, margin, minimum order quantities and any certification or documentation work needed before a product can ship. Prototype work is often project-priced, while repeat production is more likely to sit under purchase orders, call-off agreements or annual supply arrangements.
Who they sell to
Customers are usually other manufacturers, systems integrators, equipment makers and specialist engineering teams rather than consumers. SMB and mid-market buyers often deal directly with owner-managers, operations directors or heads of engineering; larger accounts tend to bring in procurement, quality, finance and compliance staff. Sales cycles are rarely self-serve, because the buyer has to assess drawings, tolerances, technical files, test evidence and continuity of supply. Direct sales and referrals matter, with formal tenders more likely where the end customer has documented procurement controls.
What they buy
Most Cardiff electronics firms tend to spend on production planning, stock control, quality management, customer relationship management, finance, cyber security and technical-document control. Manufacturing teams may also buy testing equipment, calibration services, component sourcing support, packaging, labelling, environmental compliance advice and specialist recruitment. Firms with repeat production usually need better visibility over work orders, component lead times, supplier substitutions and margin by job. Engineering-led teams may be receptive to tools that connect quoting, design changes, inspection results and customer approvals without forcing quality staff into duplicate administration.
Why and how to sell to them
Commercial intent tends to appear when electronics manufacturers take on new product work, add production capacity, win a larger customer, face component availability problems or prepare technical documentation for market access. Regulation creates another trigger: hazardous-substance controls, electrical safety, electromagnetic compatibility, radio equipment rules and EEE producer obligations all create evidence trails. Outbound messages usually work better when they speak to rework, traceability, audit preparation, margin leakage or late delivery rather than generic growth. Credibility depends on showing familiarity with engineering hand-offs, supplier risk and quality-control routines.
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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