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Waste Management Companies in Cardiff: 160 Active Firms (2026)
Waste management companies collect, transport, treat, recycle and dispose of commercial, industrial and municipal waste across Cardiff.
Buying centres in Cardiff tend to sit with facilities managers, construction project teams, local authority procurement desks and compliance-led operations that need auditable handling for mixed commercial, industrial, construction and specialist waste. Sales motions are usually operational rather than transactional: recurring collection rounds, skip and roll-on roll-off haulage, transfer or treatment capacity, and recycling contracts tied to site access, vehicle availability and duty-of-care documentation. Suppliers with the closest fit are depot- and fleet-based businesses serving South Wales, with engagements large enough to involve scheduled routes, service-level reporting and permit-aware subcontracting, rather than ad hoc domestic clearances.
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Cardiff has 160 actively trading waste management companies matching this scope, giving the city a compact but varied operator base. Reported employee numbers total 1,264, reflecting the labour and vehicle intensity of collection, transfer and treatment work. Turnover is concentrated in a smaller commercial layer: 16 firms report revenue above £5M. New formation is still visible, with 29 firms incorporated since 2022, but the operating profile remains shaped by depots, licensed activity and contracted routes across Cardiff and the wider South Wales catchment.
Permit and registration requirements shape market entry more than marketing claims. GOV.UK guidance from the Environment Agency and Defra says businesses may need an environmental permit when they use, recycle, treat, store or dispose of waste or mining waste, with routes through registered exemptions, standard rules permits and bespoke permits. Carrier, broker and dealer registration also applies where a business transports waste, buys, sells or disposes of it, or arranges for others to do so; failure to register can lead to an unlimited fine. Cardiff operators sit within the devolved Welsh regime, so English Environment Agency processes are a reference point rather than the route for local activity.
Further development appears likely to favour operators that can combine permitted capacity, route density and evidence of compliant handling. Smaller entrants may still compete around specialist streams, construction clearances and subcontracted haulage, but access to treatment sites and transfer capacity tends to set a practical ceiling. Consolidation pressure has been visible across waste services where buyers want consolidated supplier lists and clearer audit trails. In Cardiff, the balance may tilt towards multi-service contractors able to cover commercial, industrial and municipal demand across South Wales, while narrower operators remain useful where licences, equipment or site access create a defensible niche.
160
Active firms
2026
16
Above £5M turnover
reported turnover
29
Incorporated since 2022
Cardiff cohort
Key facts
About 10% of the trading cohort reports turnover above £5M (16 of 160 firms) — the rest sits below that revenue band.
18% of the cohort was incorporated since 2022 (29 firms), so a sizeable share is in its first few filing cycles.
Waste operators may need an environmental permit when they use, recycle, treat, store or dispose of waste or mining waste.
Waste carrier, broker or dealer registration applies to businesses that transport waste, buy or sell waste, dispose of waste, or arrange for others to do so; failure to register can lead to an unlimited fine.
Waste regulation is devolved, with Wales using separate registration and permitting routes from the Environment Agency process used in England.
The UK generated 191.2 million tonnes of total waste in 2020, including 40.4 million tonnes of commercial and industrial waste.
Wales recorded a 57.0% waste-from-households recycling rate in 2023, compared with 44.6% for the UK.
Top Cardiff Waste Management companies
RESOURCES MANAGEMENT U.K. LIMITED
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsProvides waste management and recycling services including skip hire, trade refuse collection and operation of waste transfer stations and recycling centres. Processes commercial and household waste,…
Serves households, trades and commercial organisations across Wales, the Welsh borders and parts of the West Midlands, plus equestrian customers using recycled carpet surfaces.
Financial Health
StableStable · -27% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides waste management and recycling services for businesses and healthcare facilities, including trade waste collection, skip hire, recycling processing and compliant disposal of commercial and…
Serves businesses, hospitals and large facilities across Cardiff, Penarth, Barry, Bridgend, Caerphilly, Newport and Bristol, including organisations with trade waste, recycling and compliance…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Dauson Environmental
Provides demolition, land remediation, recycling, and resource management services through a group of environmental and construction businesses. Activities include construction and site clearance,…
Serves businesses and public-sector bodies in Wales, including property developers, construction firms, landowners and organisations with environmental, construction, remediation or resource…
Location
CARDIFF METAL MERCHANTS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsPurchases and sells ferrous and non‑ferrous scrap metal from public and commercial suppliers. Operates scrap yards with weighing facilities and provides scrap collection, factory and site clearance,…
Serves a mix of consumers and businesses in Cardiff, including the general public, scrap metal merchants, demolition companies, factories, construction sites and large PLC/blue-chip organisations.
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 3y
Location
REGENCY OILS (WALES) LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides waste cooking oil collection and fresh cooking oil delivery for food businesses. Collects used frying oils and fats, supplies containers, handles waste transfer documentation, and sends…
Serves B2B foodservice customers such as restaurants, takeaways, cafés and commercial kitchens in South Wales and surrounding areas that use frying oils and need compliant disposal.
Financial Health
HealthyHealthy · Hiring · 26% CAGR over 3y
Location
Dauson Environmental
Provides waste recycling and resource management services, handling large volumes of construction and demolition materials. Part of a group delivering demolition, land remediation, soil supply, and…
Serves businesses and organisations with environmental, construction, demolition, remediation and resource-management needs, with an emphasis on projects and economic activity in Wales.
Location
MARQUETTE METAL RECYCLING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsPurchases and recycles scrap metal, specialising in non‑ferrous materials such as copper, brass, aluminium, stainless steel, lead and cables. Weighs and grades materials at a recycling yard and…
Serves individuals, tradespeople, garages and local businesses in Cardiff with non-ferrous scrap metal such as cables, lead, stainless steel, aluminium, brass, copper and car batteries.
Financial Health
WeakWeak · Hiring · 15% CAGR over 4y
Location
Dauson Environmental
Provides land remediation and environmental clean‑up services, including treatment and removal of contaminated soils, site preparation, and management of excavated materials to support construction,…
Serves business and development clients needing demolition, remediation, construction and resource management, including partners on environmental and construction projects. Targets organisations…
Location
RHYMNEY PLASTICS RECYCLING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Reddy Pai Metals Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsWholesales and exports ferrous and non‑ferrous scrap metals, including aluminium, copper, brass, steel and iron. Supplies recycled metal grades to manufacturers and foundries, and also trades…
Sells B2B to aluminium ingot manufacturers, copper and brass mills, automotive parts producers, foundries, electronic scrap consumers, and other non-ferrous metal industry users needing continuous…
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
MPC Water Treatment Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, maintenance, repair and monitoring of septic tanks, sewage treatment plants and pump stations. Offers tankering and desludging, drainage works, system health checks, compliance…
Serves UK homeowners, property managers, developers, commercial customers and municipal water company supply chains needing support for off-mains drainage, septic tanks, sewage treatment plants and…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
WI WASTE CLEARANCE LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Master Land Limited
Trajectory
3y · 2021–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 3y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -24% CAGR over 4y
Location
AJC ROAD SWEEPERS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
UK LOCAL TEXTILE RECYCLE LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
RUBBISH CLEARED PROMPTLY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
COLE CONTRACTORS CARDIFF LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides road sweeping and gully cleaning, asphalt planing and surfacing for roads, driveways, pathways and car parks. Also hires paving machines with or without operators and supplies site…
Serves local authorities, civil engineering and surfacing contractors, developers, commercial property owners, farmers and domestic customers needing roadway, driveway, pathway, car park or estate…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
SUD Services Cardiff Ltd
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · 0% CAGR over 1y
Location
R R GLOBAL LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Upgreen Solution Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Thomas Export&import Ltd
Trajectory
4y · 2021–NowFinancial Health
Insufficient historyInsufficient history
Location
JAMES NORVILL PROPERTIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides waste management services including commercial and domestic waste collection, skip and wheelie bin hire, drainage and sewerage tankering, hazardous waste handling, recycling services, and…
Serves businesses of all sizes, commercial, industrial and construction sites, facilities managers, scrap metal sellers, and households across Wales and the Southwest needing waste and recycling…
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
Bryn Recycling Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates waste management and recycling facilities handling non‑hazardous construction and municipal waste, sorting materials for reuse and energy recovery. Produces recycled aggregates and quarried…
Serves local councils, utility companies, construction industry buyers, businesses, communities and private customers in South Wales, combining public-sector and commercial contracts with public site…
Financial Health
WeakWeak · Hiring · 5% CAGR over 2y
Location
Install Integrated Skips Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides skip hire, tipper and grab hire services for construction and site clearance projects. Collects and disposes of non-hazardous waste, operates waste transfer services, and supplies…
Serves construction contractors, trades, property and site managers, and householders across South Wales needing skip or grab hire, site clearance, waste disposal, garden waste removal, and…
Financial Health
StableStable · Hiring · 7% CAGR over 4y
Location
BAYLISS RECOVERY (HOLDINGS) LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProcesses and recycles ferrous and non‑ferrous scrap metals, purchasing materials from businesses and the public and selling recovered metals. Provides scrap metal collection and drop‑off services…
Serves tradespeople, local businesses and individuals in South Wales looking to sell ferrous and non-ferrous scrap metals, as well as buyers sourcing recycled metals.
Financial Health
WeakWeak · 0% CAGR over 1y
Location
Hatton Redwood Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides environmental and drainage services including liquid waste removal and treatment, septic tank and cesspit emptying, drain cleaning, and CCTV drain surveys. Offers emergency response,…
Serves domestic, commercial and industrial customers, including homeowners, property buyers, businesses and industrial sites across South Wales, the South West and wider UK.
Financial Health
StableStable · 0% CAGR over 4y
Location
Bryn Power Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOperates anaerobic digestion facilities that process food waste and cattle slurry to produce biogas, generating renewable electricity and heat. Produces digestate biofertiliser and uses biomass…
Serves commercial and organisational food-waste producers across South Wales needing disposal routes, with renewable power supplied to the national grid.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Environmental Waste Services Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides asbestos removal, collection, skip hire, surveys, and roof replacement services, including hazardous waste handling and disposal. Also delivers facilities management services such as…
Serves commercial property owners and facilities managers in offices, business parks, education, retail, hospitality, residential complexes, and local authorities around Newport, Cardiff and Bristol.
Financial Health
StableStable · 0% CAGR over 3y
Location
Wave Environmental Solutions Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides recycling and waste management services for businesses, including collection and processing of paper, cardboard, plastics, wood and metals. Also offers confidential shredding, commercial…
Serves businesses and corporations with recyclable waste streams, including organisations needing secure shredding or commercial cleaning. Also trades recovered materials with intermediaries and…
Financial Health
HealthyHealthy · Hiring · 17% CAGR over 4y
Location
M & E BIN HIRE LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates scrap metal recycling services, purchasing and processing ferrous and non‑ferrous metals. Provides scrap car collection with certificate of destruction, catalytic converter recycling, and…
Serves domestic, commercial and industrial customers in Pontypridd and Rhondda Cynon Taff, including households, businesses, factories, vehicle owners and local council clients.
Financial Health
StableStable · -2% CAGR over 4y
Location
Creigiau Tyres Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides scrap tyre collection and recycling services, producing tyre bales for construction and other uses. Also operates road haulage services transporting bulk materials and goods for businesses.
Serves consumers and businesses across South Wales, including Cardiff and Swansea, plus UK customers needing bulk haulage. Targets construction projects and organisations handling scrap tyres, tyre…
Financial Health
WeakWeak · 4% CAGR over 2y
Location
RR DAVIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsBuys scrap metal from businesses and individuals and dismantles end‑of‑life vehicles. Accepts ferrous and non‑ferrous metals, provides scrap collection services, processes materials for recycling,…
Serves businesses and individuals in South Wales with scrap metal or end-of-life vehicles, including customers bringing ferrous and non-ferrous metals to a local yard.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
Welsh Tyre Recycling Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsCollects and recycles used tyres from garages, farms, scrap yards, and waste facilities. Compresses tyres using PAS108 specification baling equipment and supplies baled tyres for reuse in…
Serves Welsh businesses and public-sector sites needing waste tyre collection, including farms, estates, dairy farmers, vehicle dismantlers, scrapyards, garages, tyre retailers, local authorities and…
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
Lloyd Walters Industrial Services Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides industrial and construction support services including sand and aggregate supply, heavy haulage, recycling, land reclamation, demolition, civil engineering, crushing and screening,…
Serves B2B industrial and infrastructure clients, including steel producers, construction firms, site operators and organisations needing heavy industrial, environmental, logistics and groundworks…
Financial Health
HealthyHealthy · Profitable · -30% CAGR over 3y
Location
CYNON VALLEY WASTE DISPOSAL COMPANY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -70% CAGR over 4y
Location
Step Up Recycling Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides waste management and recycling services including skip hire, tipper and grab hire, demolition, and operation of a waste transfer station. Processes materials such as metal, paper, cardboard,…
Serves businesses and consumers needing waste management, skip or tipper hire, demolition, scrap metal dealing, and aggregate supplies, with coverage emphasised across the South Wales Valleys and…
Financial Health
HealthyHealthy · -6% CAGR over 3y
Location
ACD Skips Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides skip hire and roll-on/roll-off container hire for construction and household waste, and operates a waste tipping and recycling facility that collects, sorts and processes waste materials.
Serves local customers needing skip hire and roll-on/off containers across Bridgend and surrounding South Wales areas, including Swansea, Port Talbot, Cowbridge and Cardiff.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Nolan Realty Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides skip hire and wheelie bin hire for domestic and commercial waste, along with waste management and recycling services. Operates a waste transfer station, weighbridge facilities, and processes…
Serves households, individuals, businesses of all sizes and event organisers in Bridgend and surrounding South Wales needing skip hire, wheelie-bin collections, weighbridge access and waste…
Financial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
GRAIG ENVIRONMENTAL RECYCLING SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsOperates a scrap metal recycling service, purchasing and processing ferrous and non‑ferrous metals including copper, aluminium and steel. Provides drop‑off facilities, weighbridge services and…
Serves businesses in South Wales needing scrap metal collection, recycling containers and waste services, as well as trade or individual customers dropping off ferrous and non-ferrous metals.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Darlow Lloyd Group Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides industrial waste management and asset recycling services, including landfill management and waste reporting. Also delivers civil engineering and infrastructure works for energy and utilities…
Serves B2B and some private clients, including major industrial and production sites, DNOs, IDNOs, ICPs, EPC and O&M contractors, developers, and businesses needing construction, plant hire, waste…
Financial Health
StableStable · -9% CAGR over 3y
Location
Darlow Lloyd & Sons Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides industrial waste management and asset recycling, including landfill management and waste reporting. Also carries out civil engineering and infrastructure works for energy and development…
Serves major UK industrial and production sites, utilities and energy infrastructure firms, DNOs/IDNOs, ICPs, EPC and O&M contractors, property developers, and some private individuals involved in…
Financial Health
StableStable · Profitable · -7% CAGR over 3y
Location
Darlow Lloyd Plant Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides industrial waste management and asset recycling services for industrial sites, including landfill management and waste reporting. Also delivers civil engineering and infrastructure works,…
Serves major UK industrial and production sites, utilities and energy infrastructure firms, EPC/O&M contractors, developers, and businesses needing waste management, plant hire, construction and…
Financial Health
HealthyHealthy · -9% CAGR over 3y
Location
Purchases and recycles ferrous and non‑ferrous scrap metals from businesses and the public. Provides metal collection and drop‑off services and processes materials for resale, operating as a buyer…
Serves tradespeople, construction and plumbing firms, scrap metal dealers and individuals in South Wales who sell or buy ferrous and non-ferrous metals.
Location
SHILLIBIERS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plant and machinery hire with trained operators for construction and civil engineering projects. Also offers haulage, groundworks, aggregates supply, waste disposal, recycling services, and…
Serves businesses and project clients across construction, groundworks, haulage, recycling and waste management sectors.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
SGM Waste Management Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides waste management services including skip hire, roll‑on roll‑off containers, wheelie bin collections and waste trailer hire for domestic and commercial projects. Also offers site clearances,…
Serves homeowners, landlords, tradespeople and commercial premises needing waste removal for renovations, clearances and site work across Cardiff, Newport and South Wales.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 1y
Location
SCOTT WASTE LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides domestic and commercial waste collection and removal services, including property clearances, garden and ground clearance, and disposal of furniture, appliances and machinery. Operates a…
Serves councils, homeowners, landlords and commercial premises needing waste collection, property clearances and ground clearances across South Wales, including Porthcawl, Bridgend, Cardiff and…
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Caerphilly Skip Hire (CWS) Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides skip hire and waste removal services for domestic and commercial customers, supplying skips in multiple sizes, roll-on roll-off containers, and skip bags. Also offers wait-and-load services,…
Serves domestic customers, homeowners, tradespeople and commercial businesses needing skip hire and waste services across Caerphilly, Cardiff and wider South Wales.
Financial Health
WeakWeak · -11% CAGR over 3y
Location
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How Cardiff Waste Management companies work and how to sell to them
What they do
Cardiff waste management firms earn revenue from a mix of recurring service contracts and volume-linked activity. Commercial collections may be priced by lift, container, route or scheduled service, while skip and roll-on roll-off work is usually tied to container movements, haulage and disposal charges. Transfer, treatment and recycling income tends to depend on waste stream, tonnage, contamination level and gate fees. Many operators sell a physical service wrapped in paperwork: vehicles, yards, containers, weighing processes, handling labour and duty-of-care evidence. Subcontracting is common where a route, licence, plant item or treatment outlet sits outside the operator’s own estate.
Who they sell to
Typical buyers are facilities managers, construction project teams, estate managers, operations directors, procurement teams and local authority officers. Smaller commercial jobs can be won through direct sales, repeat site relationships and referrals from builders or property managers. Larger contracts tend to involve pre-qualification, site visits, evidence of permits or registrations, insurance checks and formal tendering. Sales cycles vary with risk: routine bin collections can move quickly, while multi-site, municipal or specialist waste work usually takes longer because access arrangements, service levels, reporting duties and downstream handling all need to be agreed before mobilisation.
What they buy
Most waste management firms tend to spend on vehicle maintenance, fuel, tyres, containers, plant hire, insurance, health and safety training, environmental advice, accounting, payroll, recruitment and debt control. Software buying often sits close to operations: CRM, job scheduling, route planning, telematics, weighbridge systems, proof-of-service capture, customer portals, billing, document management and waste transfer note workflows. Firms handling mixed or specialist streams may also buy monitoring, testing and audit support. For outbound sellers, the clearest fit is usually a tool or service that reduces admin time, improves fleet utilisation, shortens invoice disputes or helps evidence compliant handling.
Why and how to sell to them
Waste management buyers tend to evaluate suppliers when operational pressure becomes visible: a new contract win, a depot move, fleet expansion, a permit change, a tender re-award, rising missed collections, vehicle downtime, contamination issues or a backlog of compliance paperwork. Margin pressure also comes from disposal costs, manual routing, slow cash collection and fluctuating values for recyclable materials. Outreach works better when it starts from those frictions rather than broad environmental claims. Useful angles include fewer collection exceptions, clearer duty-of-care trails, faster customer reporting, lower back-office load and better visibility across subcontracted haulage or treatment capacity.
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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