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Building Materials Companies in Reading: 75 Active Firms (2026)
Building materials companies supply construction products, aggregates and related components across Reading and its surrounding area.
building materials companies in this list are UK-registered firms based in Reading matching: An ideal company supplies, manufactures or distributes building materials for construction, refurbishment and infrastructure customers. It operates in Reading and the surrounding metropolitan area with regional logistics, trade counter, wholesale or project-supply capability. It has mid-market scale, typically around £8 million to £16 million in turnover and 15 to 100 employees. It serves contractors, developers, housebuilders, merchants and facilities teams with products such as aggregates, timber, insulation, roofing, masonry, interiors or specialist construction components..
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This list covers 75 actively-trading building materials companies, of which 12 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.
17 firms in this cohort were incorporated since 2022, a signal of recent activity in the sector.
75
Active firms
2026
12
Firms above £5M
Revenue band
17
Newer incorporations
Since 2022
Key facts
About 16% of the trading cohort reports turnover above £5M (12 of 75 firms) — the rest sits below that revenue band.
22% of the cohort was incorporated since 2022 (17 firms), so a sizeable share is in its first few filing cycles.
Reading-area building materials suppliers serve builders, contractors and trade buyers where short delivery routes can matter as much as stock breadth.
Procurement is often project-led, with buyers weighing availability, haulage, returns handling and supplier credit terms alongside price.
The segment spans trade-facing merchants, specialist product suppliers and component businesses rather than a single manufacturing model.
Cash flow can be sensitive to stockholding and trade credit, particularly when materials are bought ahead of site work.
Specification-driven sales mean product standards and compliance paperwork can influence which suppliers make it onto contractor purchasing lists.
Top Reading building materials companies
ADVANCE GLASS DOORS & WINDOWS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and installs double-glazed windows and doors, including uPVC, aluminium, patio and bifold systems. Produces bespoke sealed double- and triple-glazed units and cut-to-size glass, and…
Serves homeowners and businesses in Reading and across Berkshire, including customers needing residential upgrades, glass repairs, bespoke units, and commercial refurbishment support.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
MARAZZI (UK) LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsManufactures ceramic and porcelain tiles and stoneware slabs for floor and wall coverings. Offers tile collections and large-format slabs for interiors, including kitchens, bathrooms, countertops,…
Serves a mix of consumers and trade buyers, including homeowners, architects, interior designers, installers and commercial project teams for residential, retail, hospitality and architectural spaces.
Financial Health
StableStable · 0% CAGR over 1y
Location
CGT SECURITY LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies security roller shutters and industrial door systems for commercial and industrial applications. Product ranges include aluminium security shutters, stackable shutters,…
Serves B2B trade customers in the security shutter industry, including installers, contractors and specifiers working on commercial, retail and industrial premises.
Financial Health
StableStable · 0% CAGR over 4y
Location
Quatra Direct Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies lime-based building materials to the construction trade, including hydraulic lime mortars, lime binders, renders and plasters. Also distributes related products such as bricks, fixings,…
Serves trade construction buyers—contractors, builders, developers and restoration/heritage specialists—ordering bulk lime building materials for residential, mixed-use and listed-building projects.
Financial Health
StrongStrong · Growing, Hiring · 63% CAGR over 2y
Location
SOMERVILLE GLASS AND WINDOWS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies and installs windows, doors, conservatories and rooflights in uPVC, aluminium and timber. Provides glazing services including replacement double‑glazed units, custom glass cutting, shower…
Serves homeowners, trade customers, local businesses, schools and colleges across Reading, targeting residential, commercial and education property owners needing glazing, windows, doors and…
Financial Health
StableStable · 4% CAGR over 2y
Location
Classic Quartz Stone Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsSupplies quartz stone slabs, worktops and countertops for residential and commercial interiors. Offers collections of engineered quartz, marble‑effect and porcelain surfaces, along with care kits,…
Serves trade buyers and project customers sourcing quartz slabs, worktops and countertops for commercial and residential properties in the UK.
Financial Health
StrongStrong · Hiring · 16% CAGR over 5y
Location
UNOVA LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies industrial and commercial paints, protective coatings and paint spray booths. Provides coating systems for bridges, infrastructure, manufacturing, plant machinery, rail,…
Serves B2B and public-sector customers including rail and aviation operators, infrastructure asset owners, manufacturers, plant and machinery firms, healthcare estates, commercial decorators and…
Financial Health
HealthyHealthy
Location
POLYCRETE ECO-PANELS LTD
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, engineers and manufactures metal fabrications and architectural metal systems for construction and manufacturing. Provides laser cutting, turret punching, precision milling, robotic welding…
Serves B2B customers in the built environment and manufacturing sectors, including architects, contractors, manufacturers and OEMs needing architectural metal systems, bespoke features or engineered…
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 4y
Location
A SMART PHULL ALUMINIUM BIFOLDING DOORS AND WINDOWS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak · 0% CAGR over 3y
Location
A. F. JONES STONEMASONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides architectural stonemasonry services including design, fabrication and installation of natural stone facades, porticos, staircases and interior features. Also undertakes stone carving,…
Serves private residential clients, architects, interior designers, contractors and heritage property owners commissioning high-end natural stone work for homes, historic buildings and architectural…
Financial Health
StableStable · 1% CAGR over 3y
Location
JPG Carpentry & Joinery Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
Aliva UK Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDesigns, manufactures and supplies facade systems including external wall insulation (ETICS) and rainscreen cladding for building projects, providing consultancy, structural calculations, compliance…
Serves B2B construction clients, including architects, specifiers, developers, main contractors and project teams delivering commercial, residential, hotel and public-sector buildings.
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 1y
Location
J. Pratley & Sons Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies structural steel products including universal beams, columns, channels, hollow sections, plates, and angles. Offers cutting to size, steel fabrication, and delivery for construction and…
Serves builders, construction contractors and structural steel buyers needing cut-to-size beams, columns, channels, plates and related steel sections, with delivery promoted from Reading to…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 3y
Location
Vision Development South Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies and installs prefabricated timber frame building systems for residential construction, including house kits, extensions, cabins, and conversions. Provides bespoke timber frame design,…
Serves self-build homeowners, builders, housing developers and architects planning timber-frame homes, extensions and conversions, mainly in Berkshire and surrounding southern counties.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
IPC WINDOWS AND PLASTICS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs aluminium, PVCu and timber windows and doors for domestic and commercial projects. Offers double glazing, shopfronts, curtain walling, rooflights and lanterns, with supply-only…
Serves homeowners, builders, contractors, developers and commercial clients across Newbury and surrounding counties, including retail, public sector, healthcare, education and residential property…
Financial Health
WeakWeak · -68% CAGR over 4y
Location
SAS International Limited
Manufactures metal ceiling systems and bespoke architectural metalwork for commercial buildings. Products include suspended and acoustic ceilings, ceiling rafts and baffles, integrated lighting,…
Serves B2B commercial construction clients worldwide, including architects, designers, contractors and developers working on offices, airports, universities, hospitality, data centres and other large…
Location
STANLEY JOHN LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDistributes BSI‑kitemarked iron and plastic drainage and civil engineering products, including underground pipes and fittings, manhole covers, ducting, geotextiles, and access chambers, supplying…
Sells to construction, groundwork and civil engineering firms, trade account customers and members of the public sourcing civils, drainage and related construction materials across the UK.
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 4y
Location
Able Steel
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs structural steelwork and architectural metalwork for construction projects. Produces steel frames, beams, balconies, staircases, balustrades, gates, railings and…
Serves B2B construction customers and residential clients across Newbury, Berkshire and the South of England, including property developers, housebuilders, contractors and owners of new-build and…
Financial Health
StrongStrong · Hiring · 12% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies flat roofing materials and accessories including GRP and aluminium edge trims, vents, drains, and rooflights. Provides A1 fire‑rated pedestal and decking systems, porcelain paving supports,…
Sells to B2B construction and roofing trade customers, including flat roofing contractors, builders, specifiers and installers sourcing materials for roof, decking, rooflight and safety projects.
Financial Health
HealthyHealthy · -10% CAGR over 4y
Location
Architectural Profiles Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures aluminium, steel and specialist metal roofing and wall cladding systems for buildings, including trapezoidal and standing seam roof profiles, rainscreen panels, louvres,…
Serves B2B customers including architects, specifiers, façade and roofing contractors, and construction firms involved in commercial, industrial and public building envelope projects.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
BCL TIMBER PROJECTS LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs prefabricated timber panel systems for commercial construction, including acoustic slatted wall panels, timber ceilings and façade cladding. Provides design…
Serves B2B customers on large commercial construction projects, including architects, main contractors, developers and project stakeholders specifying timber wall, ceiling and façade systems for…
Financial Health
StableStable · -68% CAGR over 4y
Location
WENDLAND LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and supplies roofing systems for conservatories and home extensions, including glass roofs, tiled Ultraroof and Livinroof systems, flat roof lanterns, skylights and roof vents, as well as…
Serves homeowners planning conservatories, extensions, orangeries and garden rooms, alongside trade installers and home-improvement professionals seeking residential roofing systems.
Financial Health
DistressedDistressed · -19% CAGR over 4y
Location
Dragon Asphalt Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures asphalt and bituminous surfacing materials for road construction and civil engineering projects. Operates asphalt plants supplying mixes for contractors and infrastructure works, with…
Serves B2B construction and civil engineering customers, including surfacing contractors, roadworks teams and trade account holders needing asphalt materials for projects across the UK.
Financial Health
StrongStrong · Growing, Hiring · 28% CAGR over 4y
Location
Castings Drainage Supplies Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies drainage and civil engineering products including manhole covers, gully gratings, channel drainage systems, underground pipes, chambers, pumps, and fittings. Sells branded drainage…
Serves UK construction and drainage markets, selling to contractors, builders, civil engineering firms, groundworkers, facilities/site managers and domestic buyers through an online trade-style shop.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
QTD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies architectural timber products including cladding, decking and thermally modified wood. Produces fire‑treated Class 0 timber and charred timber cladding, and sells related…
Serves UK homeowners, architects, builders, developers and trade contractors working on residential and commercial projects that need timber cladding, decking and fire-rated architectural timber…
Financial Health
StableStable · Hiring · 19% CAGR over 4y
Location
BRAND WINDOWS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and installs uPVC and aluminium windows, doors, conservatories, roof lanterns, garden rooms and roofline products. Supplies window and door systems to trade installers and provides…
Serves homeowners and trade installers seeking window, door, conservatory and roofline products, primarily across Berkshire, Oxfordshire, Wiltshire, Hampshire, Surrey, Gloucestershire and…
Financial Health
HealthyHealthy · -2% CAGR over 2y
Location
OLYMPIC FIXINGS IRELAND LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsSupplies wholesale merchants with screws, fixings, and construction fasteners, along with power tool accessories and trade consumables such as drill bits, cutting and abrasive discs, saw blades,…
Sells B2B to wholesale merchants and trade distributors serving construction, maintenance and hardware trades, including buyers of screws, fasteners, fixings, power tool accessories and trade…
Financial Health
StableStable · -6% CAGR over 1y
Location
PATTERN IMPRINTED CONCRETE SUPPLIES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and supplies pattern imprinted and decorative concrete products, including colour hardeners, release agents, sealers, coatings and surface preparation materials. Provides training and…
Serves trade and industry customers in decorative concrete, including installers, main contractors, plasterers, landscapers, builders, architects, surveyors and specifiers, while also supplying…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
BARRETT CEILINGS LIMITED
Trajectory
3y · 2022–NowDesigns, manufactures and installs acoustic timber slat panel systems for walls and ceilings. Produces prefabricated solid wood and timber‑effect panel systems for commercial buildings, including…
Serves architects, main contractors, developers and commercial fit-out teams delivering large UK commercial, office, education and public-facing building projects.
Financial Health
Insufficient historyInsufficient history
Location
Architectural Metals Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building enclosure services including design support, fabrication and installation of architectural metal systems such as metal panels, façades and related envelope components for commercial…
Serves B2B construction and property stakeholders, including architects, designers, building owners, construction managers, general contractors and consultants involved in building enclosure projects…
Financial Health
WeakWeak · -7% CAGR over 4y
Location
UNITED DESIGN & BUILD CONSTRUCTION LTD
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
ES BUILDING SOLUTION LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -16% CAGR over 4y
Location
FENCING PRODUCTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and installs garden fencing, gates and trellis systems. Supplies fencing materials and related products including timber, decking, sheds, concrete posts, gravel boards, sleepers and…
Serves local homeowners and other customers needing fencing, gates, sheds, timber, decking and concrete products, primarily in Wokingham, Reading and across Berkshire.
Financial Health
WeakWeak · -5% CAGR over 4y
Location
LFZ MANUFACTURING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures lightweight waterproof construction boards and panels for tiling applications, including wall and floor panels, wetroom shower bases, and wellness products such as steam rooms and…
Serves B2B bathroom and heating merchants, retailers and trade resellers supplying contractors and installers working on commercial and domestic construction, tiling, wetroom and wellness projects…
Financial Health
DistressedDistressed · -93% CAGR over 2y
Location
THE GO GRP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies fibreglass (GRP) anti-slip safety products for industrial environments, including moulded grating, stair tread covers, stair nosings, decking strips and floor sheets. Also provides…
Sells to B2B customers in industrial, construction and facilities settings, including contractors, M&E teams, site managers and organisations needing workplace access, flooring and stair safety…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Levitikal Ready Mix Concrete & Construction Limited
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Southern Ductwork (Manufacture) Ltd
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsManufactures bespoke HVAC ductwork and sheet metal components, including rectangular ducting, AHU connection tapers and offsets, plenum and grille boxes, and duct adapters, produced to specification…
Serves B2B HVAC, air conditioning and building services contractors needing ductwork subcontract support, including projects for institutional and commercial buildings across London, the South East,…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
MAY FILM AND MEDIA SOLUTIONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
HealthyHealthy
Location
K2 Solar Mounting Solutions Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies mounting systems for photovoltaic installations, including roof, façade, ground‑mounted and carport structures. Provides rails, clamps, accessories, and digital planning and…
Serves solar PV installers, distributors and project planners working on commercial, industrial, residential, facade, ground-mounted and carport projects, with support for private customers through…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
Adhesive Specialities Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsManufactures and distributes adhesive tapes, including aluminium foil, packaging, gaffer, masking, double‑sided and PVC electrical tapes. Supplies standard and bespoke or branded tapes for industrial…
Sells B2B to trades, industrial users and OEMs needing adhesive tapes, including asbestos removal, building, decorating, electrical, farming, flooring, glazing, insulation, plumbing, scaffolding,…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
JSS WINDOWS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
ALUMINIUM DESIGN SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
AGG GARAGE DOORS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
STAFFORD BRIDGE DOORS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsManufactures and installs high‑security building products including blast‑resistant, ballistic and attack‑resistant doors, doorsets, windows, walling systems and louvres. Provides certified security…
Serves B2B and public-sector buyers responsible for high-security facilities, including critical infrastructure, healthcare estates, government or heritage buildings, and industrial sites requiring…
Financial Health
StableStable · 5% CAGR over 2y
Location
Southern Counties Marble and Granite Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsImports, fabricates and retails granite, quartz, marble and other stone surfaces for kitchens and bathrooms. Manufactures bespoke worktops, vanity tops and fireplaces, and provides templating,…
Sells to domestic and commercial clients needing stone surfaces, including homeowners renovating kitchens and bathrooms, and trade or business buyers requiring granite, quartz and marble worktops,…
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
TJ HOME & GARDEN ORNAMENTS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · 0% CAGR over 2y
Location
Tyne Carpets & Flooring Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs flooring products including carpets, solid and engineered wood, laminate, vinyl, linoleum and luxury vinyl tiles such as Amtico and Karndean. Provides measuring, estimation,…
Serves domestic homeowners and commercial clients, including local authorities, shops, offices, pubs, restaurants, architects, developers and contractors.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
CRAFTED BY DESIGN LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFabricates and installs custom solid-surface products including kitchen worktops, sinks, bathroom surrounds, reception desks and commercial work surfaces using materials such as Corian, HI-MACS,…
Serves homeowners and commercial clients, including offices, receptions, commercial kitchens and washrooms, across London and the South of England.
Financial Health
StrongStrong
Location
BRUNO BOULAY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
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How Reading building materials companies work and how to sell to them
What they do
Reading building materials firms usually make money from product margin on stocked materials, bought-in lines and, for some, manufactured or fabricated components. Revenue often comes through trade counter sales, account-based wholesale, scheduled deliveries and project supply agreements, with extra margin in haulage, handling, cutting, packing or technical advice. Pricing tends to be unit, pallet, tonne or project-based, with negotiated discounts for repeat contractors and volume buyers. The commercial model is physical goods plus logistics: availability, credit terms and delivery reliability matter as much as catalogue breadth.
Who they sell to
Customers are usually local and regional contractors, developers, housebuilders, merchants, refurbishment specialists and facilities teams. The buying group tends to include procurement managers, quantity surveyors, contracts managers, site managers and commercial directors, with finance involved where credit limits or framework terms are material. Smaller orders may come through trade counters, phone ordering or email, while project work is more likely to involve quoted schedules, call-off arrangements and tender-style comparison. Sales cycles are often short for stocked lines, but longer where a buyer needs compliance documents, site delivery planning or price holds.
What they buy
Most building materials suppliers tend to spend on stock control, purchasing, warehouse management, transport planning, finance and credit-control systems. Trade-facing firms also buy CRM, quotation tools, ecommerce portals, payment services, customer account management and marketing support aimed at contractors and merchants. Operational spend commonly includes forklifts, racking, vehicles, fuel cards, waste services, insurance, health and safety advice, accounting, payroll and recruitment for drivers, warehouse staff and field sales. Firms handling specialist materials may also buy testing, certification support, technical documentation and product content management to keep quotes and delivery paperwork consistent.
Why and how to sell to them
Margin pressure, stock volatility, late deliveries and credit exposure are common reasons these firms review suppliers. Buying intent often appears when a company opens a new trade counter, expands warehouse space, adds delivery routes, hires sales or operations staff, or wins project supply work that stretches manual processes. Outbound angles tend to work better when tied to cash, service levels or risk: fewer stock-outs, faster quote-to-invoice flow, tighter credit decisions, lower delivery failure rates or clearer compliance paperwork. Procurement language should be practical and evidence-led, because many buyers will compare any new spend against known costs in vehicles, stock and labour.
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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