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Cleantech Companies in Glasgow: 31 Active Firms (2026)
Cleantech companies develop low-carbon products, energy-efficiency services and resource technologies for organisations in and around Glasgow.
Buying centres tend to sit in estates, facilities, energy procurement, sustainability and operational engineering rather than a single technology budget. Glasgow-area cleantech suppliers in this cohort sell mainly to commercial landlords, manufacturers, public-sector bodies and infrastructure operators, with engagements that range from site assessments and retrofit planning to equipment-led projects and managed efficiency services. The buying motion is often consultative: customers need evidence of payback, compliance fit and operational disruption before committing. Lean high-revenue operators can sit beside small technical teams, so turnover and employee presence are better qualifiers than a pure software-style scale signal.
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Glasgow has 31 actively trading cleantech companies in this cohort, making it a compact local market rather than a broad regional catch-all. Reported headcount totals 593 people, giving the group a visible employment footprint despite its small company count. Revenue is unevenly distributed: 5 firms are above £5M turnover, while 5 firms were incorporated since 2022, leaving a mix of established operators and newer entrants. For researchers, that structure matters because a short list can still contain both procurement-ready suppliers and early commercial businesses with narrower delivery capacity.
Work sold into buildings, energy systems, waste, water or transport infrastructure usually runs through procurement and assurance gates before it reaches deployment. For Glasgow suppliers, customers may ask for emissions evidence, health-and-safety documentation, insurance cover, installation competence and aftercare arrangements, especially where projects affect occupied sites or operational assets. Public-sector and infrastructure buyers also tend to favour auditable claims over generic environmental positioning. The market structure is therefore less about a single cleantech licence and more about proving that the service can be delivered within the buyer’s existing compliance, maintenance and capital-approval processes.
Future activity appears likely to favour firms that can turn emissions or resource-efficiency claims into auditable operational results. Buyers tend to be cautious where projects touch live buildings, industrial processes or public assets, so suppliers with repeatable delivery methods may find an easier route than those selling concept-led technology. The cohort’s mix of lean operators and small teams also suggests uneven capacity: some businesses will be able to support procurement-heavy customers, while others may remain specialist subcontractors. Consolidation has been a plausible path where installation, monitoring and maintenance capabilities sit in separate firms.
31
Active firms
2026
5
Above £5M
Revenue threshold
5
New since 2022
Incorporation date
Key facts
About 16% of the trading cohort reports turnover above £5M (5 of 31 firms) — the rest sits below that revenue band.
16% of the cohort was incorporated since 2022 (5 firms), so a sizeable share is in its first few filing cycles.
Glasgow-area cleantech firms span low-carbon products, energy-efficiency services and resource technologies rather than a single technology niche.
Buyer demand appears tied to practical decarbonisation work, including lower energy use, resource handling and lower-carbon alternatives for commercial and public-sector operations.
Consultancy, services, engineering and product revenue can sit close together in this segment, which makes procurement routes less uniform than in pure software markets.
Top Glasgow cleantech companies
SYNERGIE ENVIRON LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides low‑carbon engineering and consultancy services for energy and industrial sectors, including project development and execution for anaerobic digestion and biofuels, district energy networks,…
Serves B2B and public-sector clients in energy, oil and gas, food production, leisure, brewing, transport and local government, particularly organisations with industrial sites or heat and energy…
Financial Health
WeakWeak · -37% CAGR over 2y
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops passive electrical sensor network technology for high‑voltage power system monitoring and protection. Provides distributed sensing platforms used by utilities and renewable energy operators…
Sells to B2B and utility-sector customers in power grids and renewables, including transmission and distribution operators, digital substations teams, and operators of offshore wind and other…
Financial Health
StableStable · Hiring · 21% CAGR over 2y
Location
Noventa Energy (UK) Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops and installs wastewater heat recovery systems that capture thermal energy from sewer networks to supply heating and cooling for buildings. Designs and delivers renewable energy…
Serves public authorities, healthcare and institutional campuses, commercial property owners, residential communities and industrial facilities pursuing wastewater energy projects, with emphasis on…
Financial Health
HealthyHealthy · Hiring · 100% CAGR over 1y
Location
SMARTER GRID SOLUTIONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops distributed energy resource management system (DERMS) software and provides consulting services for electricity utilities, distribution and transmission network operators, and energy asset…
Serves electricity utilities, transmission and distribution operators, DER developers, energy service companies, municipal authorities, C&I energy users, battery fleet operators and other energy…
Financial Health
StableStable · -60% CAGR over 4y
Location
Katrick Technologies Wind Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops and commercialises patented renewable energy technology, including wind panel systems that convert turbulent ground‑level wind and airflow from infrastructure and traffic into electricity…
Targets businesses and infrastructure operators in airports, ports, industrial estates, roadways, wind farms and transport, with potential residential customers seeking on-site renewable energy.
Financial Health
StableStable
Location
Rothienorman Flexpower Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops, designs and delivers grid-scale battery energy storage systems. Provides project management, engineering integration, control system integration and software for battery optimisation and…
Serves B2B energy-sector customers, grid operators and landowners with suitable sites across the UK and Ireland, including parties involved in renewable power generation, electricity trading and…
Financial Health
WeakWeak · 0% CAGR over 3y
Location
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDevelops microalgae biomass production using captured carbon dioxide from whisky distilleries. Designs and tests photobioreactor systems powered by renewable energy to grow algae for use as…
Serves B2B customers in the whisky distillation and related agricultural supply chain, particularly distilleries seeking to use waste CO2 and producers interested in locally sourced algal biomass…
Financial Health
DistressedDistressed · -29% CAGR over 2y
Location
Myreton Renewable Energy Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops large-scale battery energy storage system (BESS) projects that store electricity generated from renewable sources such as wind and solar and supply it to the grid during periods of low…
Targets energy infrastructure investors and UK electricity grid stakeholders, including transmission network operators, renewable power generators and energy market participants involved in…
Financial Health
HealthyHealthy
Location
CLIR RENEWABLES UK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDevelops AI-based software for monitoring and analysing renewable energy assets. Platform aggregates operational data from wind, solar and battery storage portfolios to automate performance…
Serves renewable energy asset owners, asset managers, investment managers and infrastructure funds managing wind, solar and battery storage portfolios, including C-suite, in-house analysts and site…
Financial Health
StableStable · -25% CAGR over 2y
Location
European Energy
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDevelops, constructs and operates renewable energy projects, including onshore wind farms, ground-mounted solar farms, battery energy storage systems and Power‑to‑X facilities producing green…
Targets UK landowners and renewable-energy project partners, including agricultural landowners considering long-term land leases or sales for solar, wind, battery and Power-to-X sites.
Financial Health
StrongStrong · Hiring · 57% CAGR over 4y
Location
Provides energy infrastructure, smart metering installation and asset management, and gas and electricity data services. Delivers energy management, demand flexibility, and project delivery services…
Sells to a mix of B2B and B2C customers, including energy suppliers, industrial and commercial businesses, public sector organisations, and domestic households, serving stakeholders across energy…
Location
ABILITY ENERGYUK LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable heating systems for domestic and commercial buildings, including ground source and air source heat pumps, biomass systems and underfloor heating. Also provides system…
Serves domestic homeowners and commercial clients in Scotland with renewable heating requirements for residential and commercial properties.
Financial Health
WeakWeak · -11% CAGR over 2y
Location
RWE Glasgow Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, owns and operates energy generation assets including onshore and offshore wind farms, hydropower stations and biomass combined heat and power plants, and develops renewable energy, hydrogen…
Sells to B2B energy buyers, utilities, traders and corporate organisations seeking power purchase agreements for power generated from UK energy projects.
Financial Health
WeakWeak · Hiring · 5% CAGR over 4y
Location
Big Battery (Aird Farm) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsInstalls renewable energy and energy‑efficiency systems for residential, commercial and social housing properties, including solar PV panels, battery storage, air source heat pumps, and insulation…
Serves UK homeowners, tenants, businesses, commercial property owners and social housing providers, including private customers and qualifying benefit recipients accessing funded schemes.
Financial Health
StableStable
Location
GREENVERSITY LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsSupplies and installs solar photovoltaic systems and battery storage for residential, commercial and industrial properties. Also installs ground‑mounted solar arrays, solar farms and air source heat…
Serves homeowners in Scotland and commercial, industrial and energy-farm clients across Scotland and the UK, including businesses with premises or land for solar projects.
Financial Health
StrongStrong · Hiring · 398% CAGR over 1y
Location
ARBNCO LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides an AI-powered software platform for commercial real estate that aggregates energy consumption data, manages tenant consent, and supports carbon reporting, energy benchmarking, and…
Serves B2B ESG and sustainability teams in commercial real estate, finance and utilities, including REITs, investment and property managers, build-to-rent operators and corporate occupiers.
Financial Health
StableStable · -73% CAGR over 4y
Location
Urban Fox Holdings Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, funds, installs and operates electric vehicle charging infrastructure, focusing on on‑street and car park chargepoints for local authorities. Manufactures retractable kerbside chargers and…
Sells primarily to local authorities, serving EV drivers—especially residents without driveways—as end users of on-street and car park charging networks.
Financial Health
DistressedDistressed · -11% CAGR over 2y
Location
Trajectory
3y · 2019–NowFinancial sub-scores
Computed from 3 filingsDevelops energy and infrastructure projects including pumped storage hydro and battery energy storage systems to support electricity grid balancing. Also develops renewable‑powered data centres and…
Serves UK B2B infrastructure and energy markets, including electricity grid stakeholders, renewable energy investors, hyperscale data centre operators, and partners in net-zero residential…
Financial Health
StableStable
Location
ETHX ENERGY LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs, operates and maintains biomass heating systems, including renewable energy boilers, fuel handling equipment and associated heat distribution infrastructure for buildings and energy…
Financial Health
HealthyHealthy
Location
Moor Isles Farm Energy Storage
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops and operates battery energy storage projects linked to renewable energy infrastructure, storing electricity generated from sources such as solar and wind and supplying stored power to the…
Targets UK landowners who can lease or sell land for renewable energy projects, alongside project partners and local communities near solar, wind and battery storage developments.
Financial Health
DistressedDistressed
Location
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsOwns and operates energy storage infrastructure, including battery energy storage systems connected to electricity networks, supporting the storage and dispatch of electricity from renewable sources…
Serves B2B clean energy investors, asset owners and developers, plus landowners and local communities involved in wind, solar, transmission and energy storage projects globally.
Financial Health
DistressedDistressed
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops, constructs and operates onshore wind energy projects, including wind farms and related grid and infrastructure assets, as part of renewable electricity generation developments projects.
Financial Health
DistressedDistressed
Location
Foster Turner Hydro Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, constructs and operates hydroelectric power schemes and other renewable energy projects. Manages planning, optimisation and operation of small‑scale hydro installations and develops new…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
Starlight Energy Operations UK LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops renewable energy projects, focusing on the origination, development and management of solar and other clean energy assets for investment and deployment, supporting the expansion of renewable…
Financial Health
StableStable · Hiring · 18% CAGR over 4y
Location
ZLX LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops waste management and energy technology solutions, including shredding and compacting systems for waste processing, hydrogen storage and fuel applications, and AI-based business forecasting…
Serves B2B organisations in transport, healthcare, waste management, property management, pharmaceuticals, hospitality, retail, logistics, public transport, recycling, landfill, and fleet management.
Financial Health
HealthyHealthy · Hiring · 22% CAGR over 4y
Location
GLENFARNE VENTURES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops, acquires, owns and operates energy and infrastructure assets, including renewable power, grid stability and natural gas projects. Provides investment, development, construction oversight…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Green Cat Renewables
Provides renewable energy consultancy and development support services, including engineering design, environmental assessment, feasibility studies, grid and electrical services, and project…
Serves farmers and landowners, renewable energy portfolio developers, community groups, and investors/lenders involved in small and medium-scale wind, solar PV, hydro and associated infrastructure…
Location
Bradley Wind Energy 2
Provides renewable energy development and consultancy services, including engineering design, environmental impact assessment, planning support, grid and electrical design, feasibility studies, and…
Serves B2B and community-sector customers in renewable energy, including farmers and landowners, portfolio developers, community groups, and investors or lenders seeking support for small- and…
Location
Develops, owns and operates a wind farm generating renewable electricity for supply to the power grid, as part of a portfolio of utility‑scale renewable energy projects including wind, solar and…
Serves energy grids, with renewable power ultimately supplied to homes and businesses. Also targets partners and investors involved in large-scale renewable energy projects.
Location
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops, constructs and operates a utility‑scale solar photovoltaic farm generating renewable electricity, including associated infrastructure and potential battery storage, as part of a…
Targets landowners and project partners in the UK renewable energy market, particularly those involved in utility-scale solar, battery storage and onshore wind developments.
Financial Health
DistressedDistressed
Location
Develops, owns and operates a utility‑scale wind farm generating renewable electricity for the grid as part of a renewable energy investment portfolio, including the development, financing and…
Serves institutional investors, project partners and energy-market counterparties seeking large-scale renewable energy exposure, with output supplied to grids serving homes and businesses.
Location
Develops, owns and operates onshore wind farm assets as part of a renewable energy portfolio, generating electricity from wind and supporting the development, construction and operation of wind power…
Serves wholesale electricity buyers and grid-connected energy markets, with renewable power ultimately supplying homes and other energy users in the UK, Norway and Sweden.
Location
Develops, owns, and operates renewable energy generation projects, primarily onshore wind farms. Activities include planning, construction, and operation of wind energy facilities that generate…
Location
Allt Na Moine Hydro Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsOperates a hydroelectric power generation scheme using a high‑head storage system and Pelton turbine, with installed capacity of about 2 MW and annual electricity production of roughly 10 GWh.
Financial Health
WeakWeak · 0% CAGR over 4y
Location
WESSEX SOLAR POWER LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsDevelops utility-scale solar farm projects across Britain. Works with landowners to identify sites, secure planning permission, and manage development of solar parks for renewable electricity…
Serves landowners in England and Wales with suitable sites for solar farms, alongside investors seeking participation in UK solar energy projects.
Financial Health
StableStable · -81% CAGR over 3y
Location
Neilston Community Wind Farm
Operates a community wind farm through a joint venture project generating renewable electricity and distributing revenue to support local regeneration and community development programmes and…
Location
Triogen Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures Organic Rankine Cycle (ORC) systems that convert waste heat from industrial processes, gas and diesel engines, biomass systems and flares into electricity, improving energy…
Serves B2B operators of industrial processes, gas and diesel engines, biomass furnaces, flares and landfill sites that need to improve energy efficiency and generate electricity from waste heat.
Financial Health
StableStable · -4% CAGR over 2y
Location
Trajectory
5y · 2019–NowDevelops clean energy and infrastructure projects including pumped‑storage hydro and battery energy storage systems. Also develops net‑zero residential developments and renewable‑powered data centres…
Serves UK energy and infrastructure stakeholders, including utilities/grid operators, renewable investors, data centre operators, and residential partners or buyers.
Financial Health
Insufficient historyInsufficient history
Location
Innovatium Group Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsDevelops liquid air energy storage (LAES) systems and energy management technologies for industrial users. Provides grid-scale energy audits, optimisation software (PRISMA), and solutions to improve…
Serves industrial businesses and energy-intensive industrial users, particularly organisations operating compressed air systems and pursuing lower energy costs, emissions reduction, resilience and…
Financial Health
StrongStrong · Growing, Hiring · 43% CAGR over 4y
Location
ENERGY TECHNOLOGY CENTRE LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides engineering design, analysis and testing services for low‑carbon energy technologies. Develops renewable energy devices, prototypes and bespoke test rigs, and conducts system modelling,…
Serves B2B clients in the low-carbon and renewable energy sector, including developers and manufacturers in wind, marine, biomass, hydrogen, energy storage and low-carbon vehicle markets.
Financial Health
WeakWeak · -29% CAGR over 2y
Location
Heliex Power Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and supplies twin screw turbine systems that generate electricity from wet steam and industrial waste heat. Provides installation and implementation planning for steam plants in sectors such…
Serves B2B steam plant owners and operators, from small artisan producers to multinationals, especially industrial sites in marine, chemical, waste-to-energy, and food and beverage sectors.
Financial Health
StableStable · 1% CAGR over 4y
Location
Flex Marine Power Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops tidal stream energy technology, including 50 kW tidal turbines and site appraisal tools, enabling communities and businesses to generate electricity from local marine tidal flows and develop…
Serves coastal communities, community energy groups, local businesses and project partners seeking to use local tidal or marine energy resources for community-embedded renewable power projects.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
Whitehill Battery Storage Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDevelops and manages grid-scale battery energy storage projects that store electricity and help balance renewable power generation, supporting electricity grid stability and integration of renewable…
Serves UK energy and infrastructure stakeholders, including renewable power operators, grid partners, data centre developers and investors focused on net zero projects.
Financial Health
DistressedDistressed
Location
Argyll International Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides energy consultancy and low‑carbon fuel solutions, including energy performance certification for buildings, carbon management services, and development and supply of alternative “Super…
Serves B2B organisations of any size, especially building owners/managers needing energy certification and transport operators in road haulage, marine, rail and off-road vehicle sectors.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Veolia
Designs, manufactures and installs water and wastewater treatment systems for industrial and municipal clients. Provides technologies such as desalination, filtration and reverse osmosis, along with…
Sells to businesses and public sector organisations needing waste, water and energy services, including industrial sites, commercial property operators, retailers, manufacturers and local authorities…
Location
Levenseat
Provides waste management and resource recovery services including mixed waste recycling, food and garden waste processing, aggregate recovery, and energy‑from‑waste treatment. Produces recycled…
Serves local authorities and commercial customers with waste and recycling streams, plus construction and landscaping buyers seeking recycled products such as blocks, compost and recovered minerals.
Location
INTELLIGENT LAND INVESTMENTS GROUP PLC
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops clean energy and infrastructure projects including pumped storage hydro and battery energy storage systems, green data centres powered by renewable energy, and net‑zero residential…
Serves B2B and residential markets: UK energy networks and renewable generators needing storage, organisations seeking green data centre infrastructure, and buyers or occupiers of net-zero homes.
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops clean energy and infrastructure projects, including pumped storage hydro and battery energy storage systems, renewable‑powered data centres, and net‑zero residential developments to support…
Serves UK energy infrastructure investors, grid and renewable power stakeholders, data centre operators, and residential property markets seeking low-carbon developments.
Financial Health
StableStable
Location
PROCAST RESOURCES LTD.
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides building contracting and retrofit services focused on energy efficiency and decarbonisation of residential properties. Delivers insulation, renewable energy installations, design,…
Serves public and private sector organisations, especially housing associations, government bodies and businesses responsible for social, affordable and residential property decarbonisation across…
Financial Health
StrongStrong
Location
ARGYLL ENERGY SOLUTIONS LTD
Trajectory
5y · 2018–NowFinancial sub-scores
Computed from 5 filingsDevelops renewable energy and low‑carbon energy projects including tidal energy and power production. Provides engineering, procurement and construction (EPC) services for green buildings and…
Financial Health
StableStable
Location
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How Glasgow cleantech companies work and how to sell to them
What they do
Glasgow cleantech firms typically make money from a blend of consultancy, project delivery, equipment sales, monitoring software and managed services. Early engagement often begins with audits, feasibility work or energy modelling, then moves into installation, optimisation or ongoing reporting if the payback case survives scrutiny. Revenue can be one-off project fees, margin on hardware, retained service contracts or performance-linked arrangements tied to reduced energy use, waste or emissions exposure. The commercial unit is usually a site, asset portfolio or operational process rather than a licence seat, so proposals need to translate technical claims into avoided cost, compliance evidence and delivery risk.
Who they sell to
Most sell into organisations with estates, utility spend or resource-heavy operations: commercial property owners, manufacturers, transport and logistics operators, universities, health bodies, councils and infrastructure contractors. The first conversation may sit with sustainability or facilities teams, but budget approval often involves finance, procurement, operations and, for industrial sites, engineering managers responsible for uptime. Contracting tends to be direct and relationship-led, with public-sector work routed through frameworks or tenders. Sales cycles are usually longer where site access, health-and-safety review, capital approval and operational disruption are material to the buyer’s decision.
What they buy
Most Glasgow cleantech suppliers tend to spend on tools and services that help them prove outcomes and deliver projects without adding too much fixed overhead. That can include CRM and bid tracking, project management, field-service scheduling, carbon and energy reporting, finance systems for grant-funded or milestone-based work, and document control for method statements, insurance and customer assurance packs. They may also need specialist recruitment, installation partners, compliance advice, technical marketing and outsourced finance support. Hardware-led firms add supply-chain, stock, calibration, warranty and aftercare requirements that look closer to industrial services than pure software.
Why and how to sell to them
Cleantech buyers tend to evaluate vendors when a project pipeline becomes less experimental: new framework wins, larger retrofit programmes, capital-equipment orders, grant-backed delivery deadlines, leadership changes or a move from advisory work into recurring monitoring and maintenance. Outbound works better when it speaks to bid conversion, margin control, proof of savings, asset downtime and audit-ready reporting rather than generic climate positioning. Glasgow firms with small technical teams may value suppliers that reduce admin around surveys, installations, certification and customer reporting. A useful sales angle is usually operational: help them deliver more sites with fewer surprises.
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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