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Steel Manufacturing Companies in Swansea: 55 Active Firms (2026)
Steel manufacturing companies in Swansea produce, process and fabricate steel and metal components for industrial supply chains across the metropolitan area.
Buying centres tend to sit in operations, procurement and engineering rather than IT or marketing. Buyers are industrial manufacturers, construction contractors, engineering firms and infrastructure supply-chain managers needing formed, machined, treated or assembled metal parts. Engagements are usually practical and specification-led: repeat production runs, subcontracted fabrication packages, maintenance spares, and project work that requires tolerances, material traceability and delivery reliability. The relevant suppliers are not hobby workshops; they have production staff, workshop capacity and enough turnover visibility to support business-to-business procurement cycles.
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Swansea has 55 actively trading steel manufacturing companies in this list, a compact local base rather than a dispersed national cluster. The cohort reports 1,011 employees between them, so the employment footprint is measurable rather than inferred only from turnover. 11 firms report turnover above £5M, which points to a material middle tier of factory-led suppliers, while 9 were incorporated since 2022. That mix gives the list a practical skew: established fabricators and processors sit alongside newer entrants trying to win industrial and construction work.
Market structure is shaped less by sector-wide rulemaking than by the requirements attached to end markets. Construction and infrastructure customers tend to specify material grades, inspection evidence, tolerances and traceability before a component reaches site. Engineering customers often add process documentation, welding qualifications and batch-level checks. For Swansea suppliers, that makes quality assurance a commercial gatekeeper: smaller workshops can win repeat work when paperwork, certification and delivery discipline match the buyer’s procurement process, while poorly documented capacity is harder to place in regulated supply chains.
Swansea’s cohort appears production-led rather than funding-led, so change is likely to come through customer retention, plant utilisation and succession planning rather than headline expansion rounds. Smaller fabricators tend to face pressure from buyers asking for shorter lead times, cleaner documentation and price certainty on metal inputs. Scale-up scarcity may keep consolidation selective: workshops with repeat industrial contracts and auditable processes are easier to absorb than firms built around owner-managed craft capacity. The more resilient segment is likely to be suppliers embedded in recurring maintenance and infrastructure workflows.
55
Active firms
2026
11
Above £5M revenue
Larger reporting firms
9
Incorporated since 2022
Newer companies
Key facts
About 20% of the trading cohort reports turnover above £5M (11 of 55 firms) — the rest sits below that revenue band.
16% of the cohort was incorporated since 2022 (9 firms), so a sizeable share is in its first few filing cycles.
Swansea steel and metals manufacturers tend to compete on capacity, tolerances, repeat work and proximity to industrial customers.
Fabrication, processing and component manufacturing sit close together in this market, so buyers often need to read the business model behind the trading description.
Turnover is an imperfect guide to operating model; processing-heavy firms and labour-intensive fabrication businesses can report similar sales levels.
Procurement is usually practical, with workshop access, delivery windows and repeatable specifications mattering more than software-style scale.
Top Swansea Steel Manufacturing companies
Afon Toolmakers & Engineers Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides heavy steel fabrication, welding, CNC machining, plate rolling and forming, plasma and waterjet profiling, and structural steel manufacturing. Produces engineered metal components and…
Serves B2B clients in oil and gas, LNG, nuclear power, defence, renewables, hydrogen, steelmaking, marine and infrastructure sectors, including organisations with demanding engineered metalwork and…
Financial Health
HealthyHealthy · -1% CAGR over 5y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures roll‑formed coated steel roofing and cladding sheets made to measure for building projects. Supplies insulated panels, flashings, fasteners, coatings and related accessories used in the…
Serves contractors, building designers and project customers needing cladding and roofing materials for new-build and refurbishment projects.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 4y
Location
Tocs Fabrications Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides manufacturing engineering services including CNC machining, milling and turning, sheet metal fabrication, power presswork, welding, tube forming and toolmaking. Produces prototypes,…
Serves local and national businesses and public-sector bodies needing engineered components and assemblies, including automotive, defence, manufacturing, engineering, transport and academic clients.
Financial Health
HealthyHealthy · -7% CAGR over 3y
Location
Door Fabrications Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs industrial and commercial doors, roller shutters, security grilles, steel door sets and PVC strip curtains. Also fabricates gates, railings, fencing, canopies, handrails and…
Serves commercial and industrial organisations, facilities teams and property owners in Swansea, plus domestic customers needing secure premises access, gates, railings or property security upgrades.
Financial Health
StableStable · -3% CAGR over 4y
Location
Alternative Precision Sheet Metal Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision sheet metal fabrication services including laser cutting, CNC sawing, bending, welding, drilling, tapping and countersinking. Also offers PEM and Avdel insertion, CAD design…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
SWAN ALLOY UK LTD.
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsRecycles aluminium scrap and dross, converting post‑consumer and industrial aluminium waste into remelt secondary ingots, molten metal, and wrought or cast alloys. Supplies aluminium products and…
Serves B2B customers in the aluminium industry, including manufacturers and metal traders needing wrought or cast alloys, RSI or molten metal, and organisations with aluminium scrap or dross.
Financial Health
StableStable · Profitable · 0% CAGR over 3y
Location
Nishimura Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures precision dies and press‑formed metal components for automotive applications. Provides development support, prototyping, die design and fabrication, test stamping, and mass…
Serves automotive OEMs and component manufacturers developing parts for EVs, fuel-cell, hybrid and conventional petrol vehicles, from R&D/prototyping teams to mass-production engineering buyers.
Financial Health
WeakWeak · -38% CAGR over 2y
Location
Menter Afon Limited
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
AWE ALUMINIUM LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and supplies aluminium windows, doors and roof systems for trade customers. Product range includes casement, tilt and turn, and heritage windows, along with bi‑folding, sliding and…
Sells to trade and commercial buyers needing supply-only aluminium windows, doors and roofs, while also serving homeowners. Targets businesses and organisations in local areas and as far as Cornwall.
Financial Health
HealthyHealthy · -6% CAGR over 2y
Location
MK ENGINEERING (SOUTH WALES) SERVICES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -3% CAGR over 4y
Location
GREATER LONDON RAILING COMPANY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -59% CAGR over 5y
Location
HUBERT DAVIES & SON LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -60% CAGR over 5y
Location
RON JAMES (WELDING SERVICES) LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · -18% CAGR over 2y
Location
Stainlessclad Uk Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
3 K'S ENGINEERING COMPANY LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides large-scale steel fabrication and heavy machining services, including CNC and conventional machining, assembly and fitting, repair and refurbishment of industrial components, and design,…
Serves UK industrial businesses and project teams in renewable energy, nuclear, construction, offshore drilling, oil and gas, shipping and rail sectors requiring large-scale engineered components and…
Financial Health
StableStable · -24% CAGR over 1y
Location
ATT ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures stainless steel products for construction and food processing industries, including industrial drainage systems, access covers, platforms, railings, hygiene pipelines, and…
Serves B2B customers in food processing, meat plants, confectionery, restaurants, construction and machine manufacturing, plus building buyers needing drainage, access covers, protective elements and…
Financial Health
StableStable · 0% CAGR over 4y
Location
Shufflebottom Partners LLP
Trajectory
1y · 2025–NowDesigns and manufactures steel‑framed buildings and structural steelwork for agricultural, equestrian, industrial and commercial construction projects. Supplies building kits or provides erection…
Serves agricultural and equestrian businesses, industrial and commercial property operators, and main contractors delivering construction projects such as factories, offices, schools, sports centres,…
Financial Health
Insufficient historyInsufficient history
Location
Manufactures gas and water atomized metal alloy powders, including nickel-, cobalt- and iron-based alloys, for surface engineering, additive manufacturing, brazing, hot isostatic pressing and powder…
Serves B2B industrial manufacturers, engineering teams and R&D buyers using metal powders for surface engineering, high-temperature brazing, additive manufacturing, hot isostatic pressing and powder…
Location
TEXTURING TECHNOLOGY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides steel roll refurbishment and surface engineering for the metal rolling industry, including CNC roll grinding, electro‑discharge surface texturing and chrome plating. Also offers bearing and…
Serves B2B customers in the metal rolling and processing industry, including steel mills and manufacturers operating heavy rolls, targeting maintenance, production and engineering teams.
Financial Health
WeakWeak · -68% CAGR over 4y
Location
FOREDOWEL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides steel engineering services including fabrication, welding, structural steelwork, pipework installation and repair, on-site maintenance, and machine shop machining for industrial equipment…
Serves industrial and commercial clients, including steelworks, manufacturers and site operators with shutdown, breakdown, installation or bespoke engineering project needs, mainly in South Wales and…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures hygienic process equipment including stainless steel filtration systems, membrane filtration units, process skids, CIP systems, tanks and vessels, and process components such…
Sells to B2B manufacturers and process operators in regulated and industrial sectors, including biopharma and pharmaceutical, aerospace, brewing, dairy, food and beverage, chemical, cosmetic,…
Financial Health
WeakWeak · -5% CAGR over 3y
Location
ALTRON COMMUNICATIONS EQUIPMENT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and supplies mounting structures for CCTV installations, including camera towers, columns, tubular poles, cabinet‑based poles and tilt‑down systems used to support and service…
Serves B2B buyers in CCTV and security, including installers, integrators and contractors working on commercial, industrial, urban and public-area surveillance projects.
Financial Health
StableStable · -1% CAGR over 2y
Location
Trajectory
3y · 2022–NowDesigns and manufactures hygienic process filtration systems, membrane filtration units, process skids, tanks and vessels, and stainless steel process components such as valves, fittings and manways…
Serves B2B process and manufacturing customers in pharmaceutical, aerospace, brewing, chemical, cosmetics, dairy, food and beverage, and water recycling sectors.
Financial Health
Insufficient historyInsufficient history
Location
S & E ENGINEERING (ELEC) LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides precision engineering services including CNC and conventional machining, metal fabrication, and welding. Produces machined and fabricated components for industrial clients in sectors such as…
Serves B2B industrial customers and procurement teams across the UK, particularly leading companies in steel, oil and gas, alongside general end-user industries.
Financial Health
HealthyHealthy · Hiring · 9% CAGR over 3y
Location
MM ENGINEERED SOLUTIONS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and installs flood and blast defence products, including flood doors, gates, windows, glass wall barriers, watertight hatches and bund gates. Provides bespoke steel‑fabricated…
Serves commercial, domestic and public-sector customers needing asset protection, including utilities, construction firms, chemical facilities, local authorities, critical infrastructure operators…
Financial Health
StrongStrong · Growing, Hiring · 27% CAGR over 2y
Location
WALL COLMONOY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures nickel-, cobalt-, iron- and copper-based hardfacing and brazing alloys, powders and equipment. Provides thermal spraying, coating, vacuum brazing and heat treatment services, additive…
Serves industrial B2B customers, including manufacturers and engineering teams in aerospace and defence, oil and gas, glass, steel, mining, agriculture, pumps and valves, food and beverage, and…
Financial Health
StableStable · -2% CAGR over 4y
Location
RHINO SYSTEMS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures high‑performance industrial and security doors, including sliding, folding and hinged systems with fire, blast, ballistic, acoustic and flood resistance. Supplies…
Serves organisations managing critical national assets, including transport and rail infrastructure operators, defence bodies, major contractors, and commercial or industrial facilities with…
Financial Health
StableStable · -7% CAGR over 4y
Location
KING SITE SERVICES (SOUTH WEST) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering services for construction and industrial projects, including structural steelwork, mechanical installation, workshop fabrication, on-site welding, rigging and erection, temporary…
Serves B2B customers across South Wales and the UK, primarily construction firms, heavy industrial operators, steel-sector sites and renewable energy project owners needing contractors for medium to…
Financial Health
StrongStrong · Growing, Hiring · 4% CAGR over 4y
Location
Industrial & Marine Services Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
A. WELD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs structural steelwork, pipework systems, pressure vessels and steel fabrications. Provides design, fabrication and on-site installation services including portal frames,…
Serves commercial organisations and residential customers, including clients in manufacturing, construction and plant operations with bespoke steelwork, pipework, vessel and fabrication project…
Financial Health
HealthyHealthy · -66% CAGR over 4y
Location
CWM ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides subcontract precision CNC machining for metal and plastic components. Offers 3-, 4-, and 5-axis CNC milling, CNC turning, inspection, laser marking, and project management, producing…
Serves B2B manufacturers, OEMs and project teams in regulated sectors including aerospace, defence, medical, oil and gas, space and subsea markets that require certified precision component supply.
Financial Health
StableStable · Hiring · 7% CAGR over 4y
Location
ALPHA BELLOWS LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures metal, rubber, fabric and PTFE bellows, expansion joints and flexible hoses for piping systems. Provides custom engineering, machining, welding, testing, repair and…
Serves industrial B2B customers worldwide, including engineering, procurement and maintenance teams responsible for pipework systems in plants with high-pressure, high-temperature, cryogenic or…
Financial Health
StableStable
Location
J.E.S Group Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides engineering services including pipework installation, structural steel design and fabrication, non-destructive testing and inspection, industrial demolition, maintenance, and engineering…
Serves business clients in industrial, engineering and construction sectors requiring pipework, structural steel, inspection, demolition and maintenance support in South Wales.
Financial Health
StableStable · Profitable, Hiring · 6% CAGR over 2y
Location
Fairwood Engineering Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides precision engineering services including CNC milling, turning and grinding to manufacture custom machined parts and assemblies. Offers design, prototyping, repair and refurbishment,…
Serves B2B customers in aerospace, defence, oil and gas, plus other industrial sectors needing custom precision tooling, equipment, machined parts and assemblies.
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
RMD ENGINEERING (WALES) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides CNC precision engineering and machining services including CNC turning, milling and hard turning. Manufactures metal, plastic and nylon components to customer specifications and offers…
Serves large national companies and other B2B customers requiring volume precision-engineered components to specification, including buyers needing metal, plastic or nylon parts, tooling, jigs and…
Financial Health
DistressedDistressed · -69% CAGR over 4y
Location
Elite Stands UK Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · -33% CAGR over 1y
Location
Teilo Components Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsManufactures titanium and stainless steel engineering components including PCB carriers, wave soldering fingers, impellers, ploughs and nozzles. Provides metal fabrication of baskets, racks, catering…
Serves B2B customers in the UK and worldwide, including electronics manufacturers, food industry operators and catering machinery firms needing bespoke titanium, stainless steel or nylon components…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
Amman Precision Engineering Company Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures small precision components using CNC turning, CNC milling, grinding, and gear cutting. Produces one-off, batch, and high‑volume parts in metals and plastics, with additional services…
Serves B2B manufacturers and engineering firms needing precision components, including automotive, machinery, CCTV/security, industrial equipment, drain camera, laboratory/fume cabinet and toolmaking…
Financial Health
DistressedDistressed · -27% CAGR over 4y
Location
EMT PRECISION PIPEWORK LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong · -6% CAGR over 1y
Location
Haearn - Designer Blacksmiths Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
THE ALUMINIUM LIGHTING COMPANY LTD.
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and supplies aluminium lighting columns and related structural products for rail, highway and infrastructure projects. Provides standard and bespoke aluminium columns, raise-and-lower…
Serves B2B and public infrastructure customers in rail, highways and private development, including contractors, consultants, manufacturers and infrastructure specialists involved in minor and major…
Financial Health
HealthyHealthy · -7% CAGR over 5y
Location
Merit Engineering Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides steel fabrication and mechanical engineering services including sheet metal work, welding, structural steelwork, ducting and railings. Offers bespoke fabrication, on-site installation and…
Serves commercial and contractual clients across the UK, alongside domestic and private customers seeking bespoke steelwork, railings, gates, balconies, mezzanines and related engineering support.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
SKELTON THOMAS ENGINEERING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical engineering and industrial maintenance services for industrial clients, including pipework fabrication, structural steelwork, equipment refurbishment, roofing and cladding,…
Serves B2B industrial clients and site operators in South Wales, particularly organisations needing a single contractor for maintenance and engineering projects across hazardous or process-led…
Financial Health
HealthyHealthy · Profitable · -16% CAGR over 2y
Location
Hmt Engineering Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
SAFETY LETTER BOX COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -4% CAGR over 4y
Location
Glam Signs Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · -7% CAGR over 3y
Location
DP Lewis Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
W.M. & D.M. MORGAN LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides welding and metal fabrication services, producing and installing structural steelwork, staircases, fire escapes, gates, railings, mezzanine floors, cladding and portal frame buildings.…
Serves businesses, construction clients, schools, commercial property owners and homeowners needing one-off or project-based metalwork for buildings, renovations, access structures, gates and…
Financial Health
StableStable · -16% CAGR over 4y
Location
THE IRON YARD LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
Location
Glyn Neath Welding Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 5y
Location
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How Swansea Steel Manufacturing companies work and how to sell to them
What they do
Revenue usually comes from quote-led fabrication, steel processing, machining, finishing and assembly rather than off-the-shelf product sales. Swansea firms in this segment typically price work through material cost, labour time, machine time and margin, with some orders contracted as fixed-price packages and others passed through against agreed rates. Repeat customers may use call-off arrangements, while project buyers ask for drawings, tolerances, inspection plans and delivery slots before issuing purchase orders. Cash conversion can be uneven: steel may need to be bought before work starts, while payment depends on delivery, acceptance and sometimes main-contractor approval.
Who they sell to
Typical buyers are manufacturers, construction contractors, engineering firms, plant operators and infrastructure supply-chain managers that need dependable metalwork rather than generic workshop capacity. Decision makers tend to be operations directors, procurement managers, engineering managers, works managers, quantity surveyors and project leads. Contracts range from urgent spares and small batch work to framework-style repeat supply, with sales cycles shaped by drawings, site visits, insurance checks, approved supplier lists and RFQs. Most suppliers win work through direct relationships, referrals and tender processes, then retain accounts by meeting tolerances, paperwork requirements and delivery dates without absorbing too much material-price risk.
What they buy
Most Swansea steel manufacturers tend to spend on metal stock, plate, section, fasteners, welding consumables, gases, abrasives, coatings, lifting gear and haulage before they spend much on office software. Operational systems still matter: job costing, quoting, production scheduling, inventory control, quality management, document storage, payroll, HR, health and safety, fleet administration and accounting tools all sit close to revenue. Service spend often goes to certification support, insurance, energy procurement, equipment servicing, plant hire, waste handling, recruitment and training. Sellers should assume workshop disruption is costly, so implementation promises need to fit around shifts, delivery windows and customer inspections.
Why and how to sell to them
Buying intent often appears when order books stretch workshop capacity, a new customer asks for traceability evidence, or a contractor tightens delivery and documentation requirements. Other triggers include a factory move, new machinery, management succession, a finance hire, rising energy costs, material price volatility or a push to reduce rework. Outbound works better when it starts with a production or margin problem, not a generic efficiency claim. Useful angles include faster quoting, cleaner handover from drawings to shop floor, better proof of conformity, lower stock leakage, fewer delivery disputes and clearer visibility of job profitability.
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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