Heat Pump Companies in the UK: 1,269 Active Firms (2026)
Heat pump companies design, install, distribute and service low-carbon heating systems for UK homes and commercial buildings.
Buying centres tend to sit mainly in retrofit specification and project delivery, distribution of heating equipment into trade channels, and long-term service or aftercare for buildings with low-carbon systems already installed. Buyers are usually property owners, housebuilders, facilities managers, energy-efficiency contractors and public-sector estates teams, with sales cycles shaped by surveys, installer accreditation and grant eligibility rather than pure product comparison. Engagements range from individual domestic retrofit work to planned replacement programmes across housing, education, healthcare and commercial estates, so credible providers usually need both technical design capacity and field delivery.
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The UK cohort contains 1,269 actively trading heat pump and low-carbon heating firms. The larger-revenue segment is 124 with turnover above £5M, while 116 were incorporated since 2022, leaving the market weighted towards established contractors but still adding new retrofit and service entrants. Reported headcount totals 2,863 people. That workforce figure is modest against the operational demands of surveys, installation, commissioning and aftercare, which suggests a sector still reliant on subcontracted field capacity and mixed heating-trade labour rather than a purely dedicated heat-pump workforce.
England and Wales put much of the residential subsidy process through the Boiler Upgrade Scheme, with Ofgem handling administration and grant claims. Installations that use the scheme must be installed and commissioned by certified installers, so accreditation sits close to commercial eligibility rather than being a back-office detail. VAT relief for eligible energy-saving materials also affects quotation behaviour. On the supply side, the Clean Heat Market Mechanism links heating-appliance suppliers’ fossil-fuel boiler sales to low-carbon-heating credits, while the Heat Pump Association provides the main trade-body forum for manufacturers, distributors and installers.
Installer economics appear likely to remain the binding constraint. The cohort has many firms close to the heating, electrical and retrofit trades, but fewer operators with the scale to combine design, grant administration, accredited installation and aftercare under a unified operating model. Demand tends to move with grant access, consumer confidence and public-sector estate budgets, which can make order books uneven. Consolidation may favour businesses that can aggregate local installer capacity, carry accreditation costs and manage warranty risk, rather than firms that only source equipment or broker domestic leads.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
1,269
Active firms
2026
124
£5M+ firms
Turnover above £5M
116
New since 2022
Recently incorporated
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Key facts
About 9% of the trading cohort reports turnover above £5M (124 of 1,269 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (116 firms), so a sizeable share is in its first few filing cycles.
Ofgem administers the Boiler Upgrade Scheme in England and Wales, with grants of £7,500 for air-to-water and ground-source heat pumps, £2,500 for air-to-air heat pumps and £5,000 for biomass boilers.
0% VAT on installation of energy-saving materials including heat pumps applies from 1 April 2022 to 31 March 2027.
The Clean Heat Market Mechanism came into force on 1 April 2025 and sets Year 1 low-carbon-heating credit obligations at 6% of relevant boiler sales, with consultation on 8–10% for Year 2.
Certified UK heat-pump installations reached 40,426 in 2023 and more than 42,000 from January to September 2024, with average monthly installations up 39%.
EHPA reported UK sales of around 3.5 heat pumps per 1,000 households in 2024, compared with 48 per 1,000 households in Norway.
Top UK Heat Pump companies
Financial sub-scores
Computed from 5 filingsSupplies air source, ground source and air‑to‑air heat pump systems and underfloor heating to installers, developers and homeowners. Provides MCS umbrella scheme accreditation support, installer…
Serves a mix of B2B and B2C customers: heating installers, plumbers, house developers, self-builders, main contractors, homeowners, and ECO or local government funding providers across the UK.
Financial Health
StrongStrong · Growing, Hiring · 28% CAGR over 4y
Location
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Computed from 5 filingsDesigns, supplies and installs heating and renewable energy systems, including air and ground source heat pumps, underfloor heating, manifold plumbing, boilers, radiators, and heat recovery…
Serves domestic homeowners, housing developers, commercial property owners and public-sector/community organisations, including schools, universities, farms, hospitality, heritage and industrial…
Financial Health
StableStable · -9% CAGR over 4y
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Computed from 4 filingsDevelops and manufactures energy‑efficient heating and indoor climate systems, including heat pumps, hot water, ventilation and cooling solutions for residential and commercial buildings, using…
Serves homeowners and property owners, with country-specific channels for residential customers and partners seeking indoor climate solutions for homes and other properties.
Financial Health
WeakWeak · Hiring · 4% CAGR over 3y
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Computed from 5 filingsDesigns and installs ground source heat pump systems for commercial buildings, including care homes, hotels and large facilities. Provides bespoke borefield design, system integration and control…
Serves B2B owners, operators and developers of care homes, hotels and large commercial facilities, especially high-demand or regulated buildings needing lower-carbon heating and energy efficiency.
Financial Health
HealthyHealthy · -56% CAGR over 4y
Location
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Computed from 5 filingsProvides residential retrofit and energy‑efficiency upgrades, including loft, cavity wall, and internal or external insulation, air source heat pump installation, solar PV and battery systems, and…
Serves local authorities, housing associations, social landlords, private landlords, homeowners and tenants across the UK, plus commercial property owners needing retrofit, heating and insulation…
Financial Health
StableStable · -45% CAGR over 4y
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Computed from 4 filingsDesigns, supplies and commissions renewable heating systems including air and ground source heat pumps, emitters and battery storage. Works with homeowners, developers and installers to deliver…
Serves homeowners plus B2B customers including installers, heating engineers, builders, developers and contractors working on new builds, commercial offices, heritage buildings and other low-carbon…
Financial Health
StableStable · -75% CAGR over 3y
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Computed from 5 filingsProvides energy efficiency and building services including surveying, technical design, installation and maintenance of heating, cooling, ventilation and insulation systems. Also installs renewable…
Targets both B2B and B2C customers: energy companies, social housing providers, energy efficiency installers, international consultancies, and householders seeking domestic energy improvements or…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
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Computed from 5 filingsDesigns and installs renewable energy and heating systems for domestic and commercial properties, including air and ground source heat pumps, solar PV, battery storage, EV charging and biomass…
Serves domestic homeowners and commercial organisations across the UK, including owners of rural properties, manor houses and community buildings seeking renewable heating, electrical and energy…
Financial Health
HealthyHealthy · Hiring · 24% CAGR over 4y
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Computed from 5 filingsDesigns, supplies and installs heating systems, renewable energy technologies, and mechanical and electrical services for horticultural, agricultural, public sector and commercial facilities,…
Serves B2B and public-sector customers, including schools, universities, commercial and industrial sites, horticultural and agricultural operators, sports facilities and heat-network project owners.
Financial Health
StableStable · Hiring · 6% CAGR over 4y
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Computed from 5 filingsDesigns, builds and operates large-scale ground source heat pump and geo‑exchange heating and cooling networks. Provides site evaluation, feasibility modelling, system design, drilling and…
Serves businesses, property developers, heat network owners and institutions managing large building estates, with a focus on food retail, residential and mixed-use developments, and universities…
Financial Health
StableStable · Hiring · 21% CAGR over 4y
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Computed from 3 filingsSupplies ground and air source heat pumps and related equipment, including cylinders, pre‑insulated pipe, solar panels and underfloor heating systems. Provides system design support and…
Serves professional heat pump installers, property developers, homeowners and commercial property customers in the UK seeking renewable heating products, hot water systems, underfloor heating and…
Financial Health
WeakWeak · Hiring · 18% CAGR over 2y
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Computed from 5 filingsProvides heating and property retrofit services including gas boiler servicing, repairs and upgrades, installation of air and ground source heat pumps, solar PV and battery systems, and other…
Serves housing associations, local authorities, private homeowners, landlords, estate agents, care homes, schools and new-build property developers across the Midlands, including social housing…
Financial Health
StableStable · Hiring · 7% CAGR over 6y
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Computed from 5 filingsProvides plumbing, heating and air‑conditioning installation and maintenance services. Installs and services boilers, gas central heating, electrical systems, heat pumps, solar panels, battery…
Serves social housing providers and other public sector housing clients, plus private homeowners, landlords and social housing tenants. Targets residential property customers needing heating,…
Financial Health
HealthyHealthy · -5% CAGR over 4y
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Computed from 4 filingsProvides home energy‑efficiency retrofit services, including external wall and loft insulation, heating system upgrades, air source heat pump installation, ventilation improvements, and heating…
Serves homeowners and residents, plus public-sector and B2B partners including local authorities, housing associations, developers and landlords with home retrofit and decarbonisation needs across…
Financial Health
StableStable · Hiring · 115% CAGR over 3y
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Computed from 4 filingsInstalls energy‑efficiency and renewable energy systems for residential and commercial properties, including solar panels, air source heat pumps, boilers and insulation. Provides retrofit…
Serves UK homeowners, grant-eligible households, commercial businesses, and public-sector or community clients seeking energy-efficiency upgrades.
Financial Health
StrongStrong · Hiring · 22% CAGR over 3y
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Computed from 3 filingsDesigns and installs renewable heating systems including ground and air source heat pumps, underfloor heating and PV‑T solar thermal systems. Provides system design, project management and technical…
Serves commercial organisations, public sector institutions such as government offices and public housing providers, and domestic homeowners seeking renewable heating and low-energy building systems.
Financial Health
StrongStrong · Growing, Hiring · 29% CAGR over 2y
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Computed from 3 filingsProvides gas, plumbing, heating and electrical installation, repair and maintenance services for residential, social housing and commercial properties. Also installs energy‑efficiency and…
Serves social housing providers, housebuilders and private developers, plus commercial property owners and businesses nationwide with residential and commercial property portfolios.
Financial Health
HealthyHealthy · Profitable, Hiring · 14% CAGR over 2y
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Computed from 5 filingsProvides design, installation and servicing of renewable and domestic heating systems including heat pumps, solar PV panels, battery storage, boilers and underfloor heating, alongside gas and…
Serves homeowners, businesses, commercial farms and public sector organisations seeking renewable energy and heating upgrades, from single-home projects to larger commercial sites.
Financial Health
StrongStrong · Growing · 1% CAGR over 4y
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Computed from 3 filingsProvides installation of ground source heat pump systems, including borehole drilling and ground loop infrastructure, for residential and commercial developments. Also installs solar panel systems…
Serves developers, property managers, housing associations and businesses managing tower blocks, residential developments, new builds and large commercial properties across the UK.
Financial Health
StableStable · Hiring · 35% CAGR over 2y
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Computed from 3 filingsProvides home energy retrofit services including insulation installation, ventilation systems, solar PV, heat pumps, batteries and EV chargers. Also advises homeowners, landlords and housing…
Serves homeowners, private landlords, housing associations and local authorities in London and the South East, including property owners seeking funding support and social housing providers upgrading…
Financial Health
HealthyHealthy · Hiring · 56% CAGR over 2y
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Computed from 3 filingsProvides home energy efficiency improvements including insulation installation and extraction, boiler replacements, air source heat pumps, solar panels and batteries, and first-time central heating.…
Serves UK homeowners, private residents, landlords and social housing tenants, alongside social housing providers, local authorities, energy suppliers, principal contractors and housebuilders.
Financial Health
HealthyHealthy · -40% CAGR over 2y
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Computed from 5 filingsDesigns and implements decentralised energy systems for commercial and public sector clients, including heat pumps, solar generation, gas engines and energy storage. Provides energy analysis, system…
Serves industrial and commercial organisations, public sector bodies and energy performance partners with complex energy and carbon reduction needs, including manufacturers, dairies and leisure…
Financial Health
StableStable · -68% CAGR over 4y
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Computed from 2 filingsDesigns and installs renewable energy and low‑carbon heating systems for residential, commercial and industrial properties, including solar PV, heat pumps, battery storage, underfloor heating, heat…
Serves homeowners, residential developers and owners of existing and new-build homes, plus commercial and industrial businesses ranging from small properties to large-scale industrial processes.
Financial Health
StrongStrong
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Computed from 5 filingsDesigns and installs renewable energy and heating systems for residential and commercial properties, including air and ground source heat pumps, solar PV, battery storage, EV charging, underfloor…
Serves homeowners, commercial property owners and new-build developers across the North East and Yorkshire seeking sustainable energy and heating upgrades.
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 5y
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Computed from 3 filingsDesigns, installs and maintains renewable energy systems for buildings, including heat pumps, solar thermal and solar photovoltaic installations. Provides energy system design consultancy, building…
Sells to public and private sector organisations in the built environment and construction sectors, as well as end users needing renewable and decarbonisation projects. Serves homes and businesses,…
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StrongStrong · Growing, Hiring · 123% CAGR over 2y
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Computed from 5 filingsProvides mechanical and electrical contracting services including design, installation and maintenance of domestic and commercial heating systems, boiler installations, air source heat pumps, and…
Serves local authorities and housing associations in the South East, targeting social housing and public-sector property teams responsible for domestic properties, commercial spaces and resident…
Financial Health
StableStable · -2% CAGR over 4y
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Computed from 3 filingsSupplies and supports low‑carbon heating, cooling and ventilation systems for buildings and heat networks. Provides equipment including CHP units, heat pumps, electric boilers, heat interface units…
Serves B2B customers involved in heat networks and building energy systems, including developers, M&E consultants, contractors, engineers and heat-network operators, with support extending to…
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StableStable · Profitable · 2% CAGR over 2y
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Computed from 4 filingsDesigns and installs renewable heating and energy systems for residential and commercial buildings, including air and ground source heat pumps, underfloor heating, solar panels, battery storage and…
Serves both commercial property clients and residential homeowners seeking low-carbon heating, solar/battery storage, underfloor heating, MVHR, energy surveys, servicing and maintenance.
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HealthyHealthy · Hiring · 11% CAGR over 4y
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Computed from 3 filingsProvides installation of home energy efficiency measures through government-backed schemes, including insulation, air source heat pumps, gas boilers and solar PV. Assesses eligibility for grants and…
Serves UK households seeking government-funded energy efficiency support, especially residents eligible for ECO4, GBIS, Warm Homes and boiler grants, alongside local authorities and social…
Financial Health
HealthyHealthy · Hiring · 43% CAGR over 2y
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Computed from 5 filingsDesigns and installs district heating and cooling networks, including energy centres, distribution pipework and energy substations. Provides turnkey engineering services covering design, construction…
Serves UK public-sector bodies, property developers, commercial landlords, residential scheme owners and institutions needing district energy networks and low-carbon heating or cooling infrastructure.
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StrongStrong · Growing, Hiring · 77% CAGR over 5y
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Computed from 3 filingsDesigns, installs and maintains renewable energy and energy efficiency systems for commercial and public sector buildings, including solar PV, EV charging infrastructure, energy storage, and heat…
Serves B2B and public sector buyers across the UK, including construction, agricultural, commercial, industrial, education and healthcare organisations, plus warehouses, cold storage and leisure…
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StrongStrong · Profitable, Hiring · 13% CAGR over 2y
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Computed from 3 filingsSupplies and installs renewable energy systems, specialising in air source heat pumps for domestic and commercial heating and hot water. Provides system design, product supply, installation and…
Sells to homeowners and commercial customers seeking renewable heating and hot water systems, particularly those replacing boilers and applying for the UK Boiler Upgrade Scheme grant.
Financial Health
WeakWeak · -16% CAGR over 2y
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Computed from 3 filingsProvides design and installation of residential and commercial heating and energy systems, including air source heat pumps, gas boilers, solar PV, batteries and solar thermal. Also offers heat loss…
Sells to homeowners and businesses seeking heating and low-carbon energy systems. Also serves UK heating installation companies through consultancy, training and partnership support for heat pump and…
Financial Health
DistressedDistressed · 3% CAGR over 2y
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Computed from 5 filingsDesigns and supplies low‑carbon heat recovery and heat pump systems for residential and commercial buildings, including indoor heat pumps, waste‑heat recovery units, and hot water systems that…
Serves a mix of B2C, B2B and public-sector customers: homeowners, landlords, housebuilders, architects, consultants, housing providers, councils and commercial sites such as hospitality venues.
Financial Health
StrongStrong · Growing, Hiring · 31% CAGR over 3y
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Computed from 5 filingsProvides plumbing, heating, gas and drainage installation, maintenance and repair services for residential and commercial properties. Also delivers mechanical and electrical works and installs…
Serves public and private sector organisations, commercial property clients and residential customers across the North of England, including developers, local authorities, leisure centres and…
Financial Health
HealthyHealthy · -94% CAGR over 4y
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Computed from 4 filingsDesigns and installs renewable heating and cooling systems for commercial organisations, including air and ground source heat pumps, solar PV and solar thermal systems, and chillers. Also provides…
Serves businesses and organisations needing commercial renewable energy, heating and cooling systems, including sites with roofs, car parks or ground space for solar infrastructure.
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StableStable · -13% CAGR over 3y
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Computed from 5 filingsManufactures and supplies air source heat pumps and related heating products for residential and commercial buildings, providing equipment used in low‑carbon heating and renewable energy systems.
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StrongStrong · Hiring · 10% CAGR over 4y
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Computed from 2 filingsProvides home energy efficiency and retrofit services, including insulation installation, cavity wall extraction, air source heat pumps, solar PV systems, and energy‑efficient boilers, often…
Serves UK homeowners, especially fuel-poor or grant-eligible households, plus social housing providers, local authorities, house builders, energy suppliers, commercial organisations and contractors…
Financial Health
HealthyHealthy · Hiring · 42% CAGR over 1y
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Computed from 5 filingsProvides installation and maintenance of heating, renewable energy and energy efficiency systems, including solar PV, heat pumps, boilers, EV chargers and insulation. Works with homeowners,…
Serves a mix of B2C, B2B and public sector customers, including homeowners using government energy-efficiency grants, building contractors, and local authorities in need of domestic property upgrades.
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StrongStrong · Growing, Hiring · 31% CAGR over 4y
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Computed from 4 filingsProvides consultancy, design, installation and operation services for low‑carbon heat systems and district heat networks. Services include feasibility studies, air quality modelling, renewable heat…
Serves UK organisations seeking low-carbon heat: estates, retailers, housing providers, community energy groups, public/third-sector bodies and owners/operators of heat networks, biomass systems and…
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DistressedDistressed · -77% CAGR over 3y
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Computed from 5 filingsInstalls residential energy efficiency measures under UK government grant schemes, including cavity, internal and external wall and roof insulation, air source heat pumps, boilers and central heating…
Serves UK homeowners, tenants and landlords eligible for government-backed energy-efficiency grants, including domestic property owners and landlord offices managing residential tenants.
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HealthyHealthy · Hiring · 44% CAGR over 4y
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Computed from 5 filingsDesigns and installs commercial renewable energy and power generation systems, including ground and air source heat pumps and combined heat and power units. Provides energy analysis software, system…
Serves commercial and industrial organisations, including agriculture, food and drink, hospitality and public sector customers, seeking to reduce energy costs and carbon emissions.
Financial Health
WeakWeak · Hiring · 13% CAGR over 4y
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Computed from 5 filingsInstalls and upgrades heating systems including gas boilers and air source heat pumps. Provides commercial boiler plant room upgrades, system replacements and servicing for local authorities, housing…
Serves local authorities, housing associations, private householders, and owners or managers of multi-occupancy commercial buildings, with a focus on public sector domestic housing stock.
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HealthyHealthy · -1% CAGR over 4y
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Computed from 5 filingsDesigns, supplies, installs and maintains renewable energy systems for residential buildings, including air, ground and water source heat pumps, solar and battery systems, mechanical ventilation with…
Serves private homeowners, architects, builders, housing developers, housing associations, councils and property management companies across southern England, especially for homes, renovations, new…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
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Computed from 4 filingsProvides home energy retrofit and efficiency services, including insulation installation, heating system upgrades, air source heat pumps, glazing and draught proofing. Conducts retrofit assessments,…
Serves homeowners eligible for ECO4 grants, landlords, estate agents, housing associations, councils and property portfolio managers, mainly in London, across residential and commercial properties.
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StrongStrong · Growing · 0% CAGR over 3y
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Computed from 3 filingsInstalls renewable and energy‑efficiency systems for residential, commercial and housing association properties, including solar PV and battery storage, air source heat pumps, boilers, EV charging…
Serves homeowners, tenants, landlords, businesses and housing associations across Wales and England, including hospitality operators and affordable housing providers managing residential stock.
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StrongStrong · Profitable
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Computed from 3 filingsInstalls renewable energy and energy‑efficiency systems for domestic and commercial properties, including solar panels, solar batteries, air and ground source heat pumps, insulation measures,…
Serves UK homeowners seeking grant-funded energy efficiency improvements, alongside commercial and agricultural customers considering renewable energy and insulation upgrades.
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StrongStrong · Growing, Hiring · 123% CAGR over 2y
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Computed from 5 filingsDesigns and installs renewable energy systems for residential and commercial buildings, including ground and air source heat pumps, solar PV, underfloor heating, mechanical ventilation with heat…
Serves homeowners, commercial property owners, large residential developers, public-sector property projects, agricultural buildings, and architects/M&E consultants seeking renewable building energy…
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StrongStrong · Hiring · 5% CAGR over 4y
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Computed from 3 filingsDesigns and installs renewable energy systems for domestic and commercial properties, including air and ground source heat pumps, biomass boilers, solar PV and battery storage. Provides system…
Serves homeowners, small non-domestic property owners, commercial clients, housing developers, renewable energy companies and manufacturers seeking renewable energy installation, assessment or…
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HealthyHealthy · Hiring · 13% CAGR over 2y
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Computed from 3 filingsDesigns and installs renewable and energy‑efficient heating systems, including district heat networks and biomass systems. Provides fire sprinkler installations, energy efficiency upgrades, and…
Serves public sector bodies across the UK, including councils, schools and housing associations, plus commercial property owners and private residential customers seeking large-scale energy…
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WeakWeak · -11% CAGR over 2y
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How UK Heat Pump companies work and how to sell to them
What they do
Heat pump firms usually make money from a mix of equipment margin, design and survey fees, installation labour, commissioning, and service or warranty packages. Domestic retrofit work is often quoted as a fixed-price project after a site assessment, while commercial and public-estate work tends to sit inside planned maintenance, decarbonisation or replacement programmes. Distributors earn through trade supply and credit terms rather than end-user installation. Larger operators may also package remote monitoring, planned servicing and emergency call-out cover, which gives recurring revenue after the initial system sale and helps smooth demand between project peaks.
Who they sell to
Most sales run through property and estates buying centres rather than pure consumer impulse. Domestic customers often involve an owner-occupier, landlord or retrofit adviser, while larger deals bring in asset managers, facilities directors, sustainability leads, building-services consultants and procurement teams. Housebuilders and contractors tend to buy through preferred-supplier arrangements or negotiated trade channels. Public-sector and housing-association work is more likely to involve framework agreements, tenders and evidence of accreditation, insurance and delivery capacity. Sales cycles are typically survey-led: the buyer needs confidence on heat loss, disruption, subsidy eligibility, running costs and aftercare before signing.
What they buy
Most heat pump firms tend to spend on tools that reduce friction between survey, design, installation and aftercare. Useful categories include field-service scheduling, mobile job management, quotation software, CRM, inventory and van-stock control, finance and cash-collection systems, and document workflows for accreditation and grant claims. Commercial operators may also need asset monitoring, metering, analytics, helpdesk software, cyber security, accounting, HR and fleet management. Services spend often sits around installer recruitment, technical training, health and safety, insurance, planning advice, paid search, local lead generation and bid support for housing or public-estate work.
Why and how to sell to them
Heat pump buyers tend to evaluate suppliers when capacity, compliance or cash flow becomes awkward. Common triggers include a move into multi-site retrofit, a new public-sector tender, a larger distributor relationship, a leadership hire, a depot opening, or a shift from installation-only work into service contracts. Ofgem-administered grant processes and certified installation requirements make evidence, paperwork and audit trails commercially relevant, not just administrative. Outbound messages usually land better when tied to specific operating costs: fewer failed surveys, quicker quote turnaround, lower rework, better warranty control, clearer stock visibility, or higher first-time fix rates.
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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