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Steel and Metals Companies in Glasgow: 100+ Active Firms (2026)
Steel and metals manufacturers in Glasgow produce, process and fabricate metal components for industrial customers across the city region.
Procurement, production engineering and operations teams usually sit at the centre of buying, with finance involved once repeat supply or capital-linked tooling commitments appear. The better-fit suppliers for this page tend to be mid-market operators with owned production, machining, treatment or finishing capacity, selling to industrial and commercial buyers rather than acting as pure stockholders. Engagements are often repeat call-offs, engineered fabrication work or framework supply into regional and UK chains, so qualification hinges on delivery reliability, tolerances, inspection regimes and the ability to handle job-specific requirements.
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Glasgow has 102 actively trading steel and metals manufacturers in this cohort, making it a fairly compact local market rather than a broad national manufacturing base. Reported headcount across the group is 2,543 people, giving the category an employment footprint that extends beyond very small workshops. The shape is consistent with a city-region supply chain: many businesses will be organised around workshops, machining halls, fabrication bays and finishing lines, while the larger revenue earners are likely to be those embedded in repeat industrial procurement rather than one-off retail demand.
Plant-level obligations matter more here than any single sector licence. Operators with production, treatment or finishing facilities must manage workplace risks, waste streams, emissions, material traceability and customer audit requirements, while fabricators serving industrial buyers are often pulled into contract-led standards set by their customers. That tends to make compliance operational rather than purely legal: documented processes, inspection evidence and subcontractor controls can influence whether a supplier wins repeat work in UK supply chains. Smaller workshops may face the same buyer expectations as larger sites, but with less dedicated compliance capacity.
Future movement appears likely to be uneven. Established manufacturers with owned plant, repeat procurement relationships and documented quality controls tend to have defensible positions, but capacity additions are likely to be cautious because machinery, skilled labour and energy exposure make expansion harder than in asset-light sectors. Newer entrants may find niches in specialist finishing, small-batch fabrication or overflow capacity for regional buyers. Consolidation appears plausible where succession issues, underused plant or customer concentration create pressure, though many operators may remain locally anchored production businesses rather than becoming platform-style scale-ups.
102
Active firms
2026
15
£5M+ firms
Turnover threshold
13
Recent incorporations
Since 2022
Key facts
About 14% of the trading cohort reports turnover above £5M (15 of 102 firms) — the rest sits below that revenue band.
12% of the cohort was incorporated since 2022 (13 firms), so a sizeable share is in its first few filing cycles.
Glasgow’s steel and metals manufacturers sit in supply-side industrial markets, producing, processing and fabricating components for business buyers.
Local procurement tends to favour suppliers that can fit around industrial sites, maintenance schedules and project delivery windows.
The segment is mainly SME and lower mid-market in character, rather than consumer-facing manufacturing.
Revenue scale and operating footprint do not always move together in this market, so buyer screening often needs both financial and workforce context.
Top Glasgow steel and metals companies
Marpet Fabrications (1997) Ltd.
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDesigns, manufactures and installs sheet metal fabrications in stainless steel, mild steel and aluminium, including production line equipment, conveyor systems, access platforms, pipework, and…
Serves B2B industrial clients across Scotland and the North of England, especially food and drink manufacturers, bakeries, distilleries, soft drinks firms, caterers, and production-line operators.
Financial Health
WeakWeak · -13% CAGR over 3y
Location
Skip Manufacturer UK Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures metal waste skips and containers, including roll-on roll-off and hook-lift units. Provides bespoke design and fabrication, repair and refurbishment of skips, and produces liquid and…
Sells to UK waste management and skip hire operators, recycling firms, and industrial or construction businesses that procure metal skips, waste containers, and related repair/refurbishment services.
Financial Health
WeakWeak
Location
NEPTUNE FABRICATIONS (HOLDINGS) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures custom metal fabrications in stainless steel and aluminium, including ductwork, tanks, hoppers, brackets, canopies and machine guards. Provides fabrication services for industrial and…
Serves businesses and organisations needing custom metalwork, including industrial firms requiring stainless steel or aluminium fabrications, ductwork, tanks, hoppers, brackets, canopies and guards.
Financial Health
StableStable
Location
HYMEC ENGINEERING SERVICES LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides precision engineering and manufacturing services including CNC milling and turning, sheet metal fabrication, component assembly, surface treatments, and quality inspection, producing complex…
Serves B2B customers in the aerospace, automotive, motorsport and medical sectors, including national and international manufacturers and engineering teams needing precision components and assemblies.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 3y
Location
POWDERTEC LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides powder coating, surface treatment and bonding processes for metal components, including TiZr pre-treatment and INTRICOAT technologies. Serves sectors such as automotive, electric vehicles,…
Serves B2B customers in automotive, electric vehicle, medical and aerospace sectors, including manufacturers and engineering teams requiring specialist surface treatment suppliers.
Financial Health
StableStable · Hiring · 63% CAGR over 2y
Location
FAB-24 LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures architectural metal fabrications and façade systems for construction projects. Supplies cladding components and bespoke sheet‑metal products, using CNC machining and MIG/TIG welding,…
Serves contractors, architects, designers and construction clients across the UK needing architectural metal fabrications, cladding and façade solutions for building projects.
Financial Health
StableStable · -1% CAGR over 2y
Location
UK Structural Systems Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, fabricates and installs structural steelwork for construction and industrial projects, including mezzanine floors, steel staircases, beams, walkways, fire escapes and general mild steel…
Serves commercial property owners, contractors, builders and architects, with customers in hospitality, retail, automotive and leisure sectors across Scotland and wider UK locations.
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 5y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures and supplies wire and sheet metal products including window guards, mesh, baskets, grilles, railings, gates and balustrades. Provides wire forming, steel fabrication, sheet metal work,…
Serves B2B and B2C customers across Scotland, including commercial building developers, housing associations, maintenance groups and homeowners.
Financial Health
HealthyHealthy · -5% CAGR over 3y
Location
Clydeforth Engineers & Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs industrial pipework systems, tanks and vessels, structural steelwork, ducting and heat exchangers. Works with materials including stainless steel, duplex alloys,…
Serves industrial and engineering businesses, contractors and plant operators across Scotland with project needs for fabricated pipework, tanks, vessels and steelwork on industrial sites.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
POSSILPARK SHOTBLASTING COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides metal finishing services including shot blasting, blast cleaning, industrial painting, thermal metal spraying and intumescent fire‑protection coatings. Works on structural steel, bridges and…
Serves industrial and commercial customers in marine, oil and gas, power generation, rail and structural steel construction, alongside smaller domestic customers needing metal treatment for items…
Financial Health
StableStable · -68% CAGR over 4y
Location
Industrial Pumps & Gearboxes Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides precision engineering and machining services including CNC turning, milling, grinding and gear cutting. Manufactures custom gears, sprockets and mechanical components, and offers…
Serves UK B2B industrial customers, including manufacturers in textiles, paper and leather, plus transport vehicle operators or restorers requiring vintage parts for one-off, small or medium…
Financial Health
StableStable · -18% CAGR over 2y
Location
ABT Engineering Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides metal fabrication and welding services including general fabrication, CNC machining, water jet and laser cutting, pipework and conveyor fabrication, equipment repairs, powder coating, and…
Serves businesses and organisations across industrial sectors, including manufacturers, processing plants, facilities with equipment or machinery, and buyers commissioning one-off parts, prototypes,…
Financial Health
HealthyHealthy · -14% CAGR over 4y
Location
THE PARKHEAD WELDING COMPANY LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and fabricates structural steelwork and secondary steel for construction projects, including staircases and architectural metalwork such as stainless steel and glass balustrades. Also…
Serves B2B clients in construction, property development, facilities management and other market sectors requiring structural and architectural metalwork projects and repair support.
Financial Health
StableStable · 0% CAGR over 2y
Location
EMAC ENGINEERING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and fabrication services including welding, pipe fabrication, sheet metal work, insulation and cladding, and mechanical services. Works with sectors such as oil and gas,…
Serves B2B industrial clients in the UK and internationally, particularly organisations in oil and gas, manufacturing, utilities, distilling and renewables sectors needing engineering project support.
Financial Health
StableStable · 2% CAGR over 4y
Location
Forrest Precision Engineering Company Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides precision engineering and machining services including gear cutting, CNC and conventional turning and milling, fabrication, and grinding. Manufactures custom gears, sprockets and special…
Serves UK businesses needing precision-engineered industrial parts, including manufacturers in textiles, paper and leather, plus customers requiring one-off or small-to-medium batch gear cutting,…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures aluminium and zinc alloy die cast components. Provides design and project management, pressure die casting, CNC machining, finishing, and assembly services, supplying parts from raw…
Serves business customers needing aluminium and zinc die cast components, from raw castings to finished assemblies. Targets engineering, manufacturing and OEM buyers seeking design support,…
Financial Health
WeakWeak · -9% CAGR over 3y
Location
POSSILPARK SHOTBLASTING & COATINGS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides metal finishing services including shot blasting, blast cleaning, industrial painting, thermal metal spraying and intumescent fire protection coatings for structural steel and metal…
Serves B2B customers in marine, oil and gas, power generation, rail and structural steel construction, alongside domestic customers needing treatment of gates, railings, fireplaces, trailers and…
Financial Health
StrongStrong
Location
ARMSTRONG ROOFING COMPONENTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies bespoke metal roofing sheets and cladding products, including PVC plastisol-coated, painted and galvanised steel profile sheets. Provides materials for roofing and external…
Serves public and trade customers across the UK, including homeowners, builders, agricultural businesses, factories, warehouses, distribution centres, retail and leisure operators needing roofing or…
Financial Health
WeakWeak · -4% CAGR over 4y
Location
James Murphy Group
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsManufactures and supplies wire and welded mesh products in stainless, plated and coated steel. Produces custom items including door and window security guards, security fencing, pest and insect mesh…
Serves businesses and domestic customers, including industrial and commercial users, trades professionals, small local organisations and large multinational corporations.
Financial Health
StableStable · 0% CAGR over 1y
Location
MARTEC ENGINEERING GROUP LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs metal fabrication products for construction, including steel windows and doors, fire‑rated screens and doors, architectural metalwork, balconies, and electronic…
Serves the UK construction sector, primarily contractors, architects, designers and specifiers seeking specialist subcontractor support for commercial and public building projects.
Financial Health
WeakWeak · -13% CAGR over 4y
Location
MDL MANUFACTURERS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides contract manufacturing and precision machining services, specialising in large-scale machining of metal components. Produces machined parts and assemblies for industrial and…
Serves B2B customers across varied industrial markets, particularly organisations needing outsourced large-machining and precision manufacturing capacity for project-based production requirements.
Financial Health
HealthyHealthy · Hiring · 18% CAGR over 2y
Location
Allan Fabrication Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
ACE FABRICATIONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides steel fabrication services for construction projects, including structural design, custom metal fabrication, and on-site installation. Produces and installs steel components and assemblies…
Serves construction-sector clients and project owners, including contractors, developers and organisations needing custom steel fabrication for building projects.
Financial Health
WeakWeak · Hiring · 5% CAGR over 3y
Location
HALLIDAY PIPEWORK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Stewart Precision Metals Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides metal laser cutting and bespoke metal fabrication services. Produces flat and folded sheet metal components, shop fittings, furniture and architectural features, and offers technical design,…
Serves businesses and private clients, including retailers, oil and gas firms, rail, agriculture, construction, electrical and catering companies, plus domestic customers with furniture or…
Financial Health
StableStable
Location
BESPOKE STEEL BUILDINGS & CLADDING LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
Aardee Security Shutters Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures, supplies and installs industrial and commercial security products including roller shutters, steel door sets, sectional overhead doors, high‑speed doors, fire shutters and curtains, and…
Serves businesses and industrial sites in Scotland, including factories, warehouses and commercial premises needing physical security, fire-rated and energy-saving door and shutter products.
Financial Health
HealthyHealthy · -4% CAGR over 2y
Location
Glasgow Chromers Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
R.I.G. Fabrication Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides fabrication, repair and refurbishment of oilfield drilling equipment. Offers shop and field mechanical services, inspections, equipment unitisation, engineering and drafting, and supplies…
Serves oil and gas companies, drilling contractors and oilfield service firms operating land and offshore rigs, particularly buyers responsible for mechanical drilling equipment, mud pumps, parts and…
Financial Health
WeakWeak · -2% CAGR over 4y
Location
Barclay & Mathieson
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsSupplies access and safety systems made from glass‑reinforced polymer (GRP), steel and aluminium, including grating, walkways, stairs, treads, handrails and anti‑slip components. Also provides…
Serves B2B customers including construction contractors, rail operators, energy and utilities firms, marine and environmental projects, manufacturers, infrastructure, telecoms and data centre teams…
Financial Health
WeakWeak · -1% CAGR over 1y
Location
D TOBIAS (1995) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -67% CAGR over 4y
Location
JK STEEL LTD.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
BROWN MCFARLANE PRECISION ENGINEERING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides steel plate processing and precision engineering services, including CNC machining, laser, plasma and waterjet cutting, plate bending, drilling, rolling and bevelling. Produces custom…
Serves industrial B2B customers in energy, oil and gas, renewables, petrochemical, nuclear, defence, mining and quarrying, waste and recycling, offshore structures, civil engineering and general…
Financial Health
HealthyHealthy · -90% CAGR over 2y
Location
CAIRNHILL STRUCTURES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, fabricates and installs structural steelwork and engineered metal structures. Provides machining, surface coating, inspection, repair and project management services for infrastructure,…
Serves B2B and public-sector buyers in heavy industry and infrastructure, including oil and gas, nuclear, power, rail, petrochemical, marine, renewables, bridges, utilities and major construction…
Financial Health
WeakWeak · -65% CAGR over 4y
Location
THOMSON PETTIE LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides sheet metal and tube processing services including laser tube and section cutting, tube bending, fabrication and welding. Also offers paint and powder finishing and subcontract assembly,…
Serves B2B OEMs and suppliers in the bus and coach, haulage, specialist vehicle and earthmoving sectors, including buyers of finished parts, components, chassis/body kits and assemblies.
Financial Health
HealthyHealthy · Profitable, Hiring · 5% CAGR over 2y
Location
GILLRICK METALWORK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides sheet metalworking and metal fabrication services using ferrous and non‑ferrous materials. Also offers precision machining, laser cutting, welding, pump refurbishment, electrical and…
Serves B2B customers across a wide variety of UK industries, including project teams and industrial operators needing sheet metalwork, precision components, fabrication and engineering maintenance…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
J.G.B Steelcraft Holdings Limited
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides precision metal profiling and fabrication services, including laser, plasma and waterjet cutting, turret punching, guillotining, press brake folding and welding. Also offers shot blasting…
Serves B2B customers in engineering, manufacturing, electronics and fabrication that need subcontract metal profiling, steelwork and specialist metal processing.
Financial Health
StableStable
Location
Integrity Engineering (Scotland) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering manufacturing and technical services for the oil, gas and energy sectors, including CNC machining, welding and fabrication, valve and actuator supply and refurbishment, equipment…
Serves B2B customers in the oil, gas and energy sectors, including operators, subsea/riser equipment owners, and engineering, procurement and maintenance teams worldwide.
Financial Health
StableStable · -7% CAGR over 4y
Location
Weldon Engineering (Scotland) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs engineered tanks, silos, aeration units and treatment equipment for water treatment and industrial systems. Provides general metal fabrication, specialist welding…
Serves water treatment operators, industrial and energy sites, and project teams needing fabrication, welding and installation support, with some work for commercial and residential projects across…
Financial Health
HealthyHealthy · 2% CAGR over 4y
Location
McLuckie Engineering (LEV) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs dust and fume extraction systems for industrial workplaces. Provides ductwork fabrication, ventilation systems, filter installation, LEV testing, and sheet metal…
Serves industrial-sector businesses across the UK, including factories, workshops and other workplaces requiring dust, fume, ventilation and LEV compliance support.
Financial Health
StableStable · 0% CAGR over 4y
Location
JGB Steelcraft (U.K.) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision metal profiling and fabrication services, including laser cutting, HD plasma and waterjet cutting, turret punching, guillotining, folding, welding, shot blasting, and painting or…
Serves business customers needing subcontract precision metal profiling and fabrication, including manufacturers, engineering firms and fabricators working with sheet metal, specialist steels and…
Financial Health
HealthyHealthy · Growing · 1% CAGR over 4y
Location
GEORGE TAYLOR & CO. (HAMILTON) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures iron castings in ductile, grey and austempered ductile iron grades at a jobbing and semi‑repetition foundry. Produces cast components from 0.5 kg to 3,000 kg for a range of industrial…
Sells to businesses in numerous industrial sectors needing iron castings, including buyers requiring jobbing or semi-repetition production. Serves UK customers and some international industrial…
Financial Health
HealthyHealthy · -1% CAGR over 4y
Location
GCH Precision Engineering Ltd.
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides precision engineering and bespoke manufacturing services including machining, heavy vertical and horizontal boring, repair and rework, machine tool maintenance, and breakdown support.…
Serves B2B industrial customers, particularly blue-chip and OEM oil and gas companies, plus firms with heavy manufacturing, tubular/casing, machine-tool and plant maintenance requirements.
Financial Health
HealthyHealthy · -21% CAGR over 2y
Location
Fabrication Specialists Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies fabricated pipework, structural steelwork and bespoke metal fabrications. Provides design and fabrication of custom components and equipment for oil and gas, pharmaceutical,…
Serves B2B industrial customers in Scotland and the wider UK, especially oil and gas, pharmaceutical, power generation and water companies with pipework, steelwork and bespoke fabrication…
Financial Health
HealthyHealthy · -10% CAGR over 5y
Location
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How Glasgow steel and metals companies work and how to sell to them
What they do
Steel and metals manufacturers in Glasgow typically earn revenue from repeat production work, engineered fabrication, machining, treatment, finishing and assembly for industrial customers. Pricing is usually a mix of material cost, labour time, machine time, finishing steps, inspection requirements and delivery terms, rather than a simple catalogue price. Some jobs are quoted as one-off projects, but the more attractive commercial relationships tend to become call-off supply, framework agreements or recurring batches. Margins depend on yield, scrap control, energy usage, tooling set-up time and the ability to schedule varied jobs through constrained plant.
Who they sell to
Customers are usually industrial and commercial buyers in sectors that need durable metal components, assemblies, enclosures, fixtures or treated parts. Procurement managers may run the process, but production engineers, operations directors, quality managers and finance teams commonly shape the shortlist because specification fit and delivery risk matter. Typical sales motions are direct and relationship-led, with repeat work won through approved-supplier status, framework renewal, site visits, sample runs and inspection evidence. Contract values vary by material, tolerance and volume; most cycles are shorter for overflow or repair work and longer where the buyer requires audits, drawings or qualification runs.
What they buy
Most operators tend to spend on practical systems and services that keep plant utilised and jobs traceable. Common categories include production planning, stock control, quoting, job costing, quality management, maintenance scheduling, health and safety administration, finance, payroll and customer relationship management. Cyber security and basic IT support matter because drawings, purchase orders and customer specifications move through email, shared folders and shop-floor terminals. They also buy recruitment, training, calibration, insurance, waste handling, energy advice, transport and accountancy support. Sellers should expect buying criteria to be pragmatic: lower downtime, fewer errors, clearer audit trails and faster quoting usually beat abstract digital language.
Why and how to sell to them
Buying intent often appears when a manufacturer wins a repeat supply contract, adds shift capacity, replaces ageing machinery, hires an operations or finance lead, prepares for a customer audit, or tries to reduce rework and late deliveries. Energy exposure, material price movement and scarce skilled labour can also push management to review suppliers that affect utilisation or margin control. Outbound messages work better when they are specific to plant constraints: quote accuracy, machine availability, batch traceability, certification evidence, cash tied up in stock, or fewer manual handovers between office and workshop. Generic growth claims tend to be easy 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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