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Solar Installation Companies in Cardiff: 51 Active Firms (2026)
Solar installation companies in Cardiff design, fit and maintain photovoltaic systems for homes, landlords and commercial sites across the metropolitan area.
Buying centres sit across property owners, estates teams and construction-led project managers rather than a single software-style budget holder. Residential work tends to be sold to homeowners and landlords seeking design, supply, installation and maintenance in one contract, while commercial and public-sector demand sits closer to electrical contracting and site-led project delivery. The better-fit firms for this page are operators that can handle surveys, system design, commissioning and aftercare across South Wales, not only firms reselling panels or acting as marketing intermediaries.
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Cardiff has 51 actively trading solar installation companies in this cohort, making it a compact local market rather than a broad national contractor base. Reported employment totals 560 people, which points to a sector with visible installation capacity as well as owner-managed trades. The Cardiff focus also matters commercially: buyers are likely to value local survey coverage, response times and aftercare across the metropolitan area and South Wales, particularly where electrical contracting and renewable project delivery need to sit under the same supplier relationship.
Market structure is not only micro-trades: 8 firms report turnover above £5M, so procurement buyers should expect a mix of small contractors and businesses with capacity for repeat commercial work. A further 6 firms have been incorporated since 2022, suggesting some recent entry around local renewable installation demand. Regulatory exposure is likely to sit in project execution rather than product licensing: evidence of competent electrical work, safe commissioning, maintenance commitments and public-sector procurement readiness will matter more than brand-led claims.
Demand appears tied to property-level decarbonisation budgets, electricity-cost sensitivity and the practical limits of local installer capacity. The Cardiff cohort looks split between owner-managed electrical contractors and more developed renewable project businesses, so consolidation may come through subcontracting relationships, acquisitions or shared delivery arrangements rather than a winner-takes-most pattern. Firms that can keep survey, design, installation and aftercare close together should be easier for commercial and public-sector buyers to diligence, while thinner operators may remain exposed to planning friction, labour availability and cash-flow timing.
51
Active firms
2026
8
Above £5M
reported turnover
6
Since 2022
incorporated firms
Key facts
About 15% of the trading cohort reports turnover above £5M (8 of 51 firms) — the rest sits below that revenue band.
11% of the cohort was incorporated since 2022 (6 firms), so a sizeable share is in its first few filing cycles.
Cardiff solar installers sit at the delivery end of the photovoltaic market, handling surveys, roof work, electrical installation and maintenance for local buyers.
Demand comes from households, landlords and commercial sites, so sales cycles tend to differ by roof ownership, finance route and installation complexity.
National panel supply and finance offers still rely on nearby contractors for site assessment, installation and aftercare.
Qualification usually needs a distinction between domestic retrofit installers and contractors set up for commercial electrical work.
Top Cardiff Solar Installation companies
Ges Green Solar Company (UK) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs solar photovoltaic systems for residential and commercial properties. Provides solar panel installation, battery storage integration, system monitoring, maintenance and repair…
Serves homeowners, domestic energy users and commercial property owners across Cardiff, Newport, Swansea, South Wales and Bristol, including participants in Wales’ Switch Together scheme.
Financial Health
StrongStrong · Growing, Hiring · 35% CAGR over 2y
Location
Orion TS Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance of electrical systems. Offers EICR inspections, structured cabling, commercial solar installations, EV charging…
Serves businesses, landlords, homeowners and public-sector organisations across South Wales and the UK, including retail, healthcare, education, HMO and commercial property clients.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
ARC ELECTRICAL SYSTEMS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical design, installation and maintenance for domestic, commercial and industrial properties. Offers inspection and testing, fire alarm and access control systems, solar PV…
Serves a mix of B2C, B2B and public-sector customers in South Wales, including homeowners, private customers, workplaces, landlords, letting agents, local authorities and small to medium industrial…
Financial Health
StrongStrong
Location
Ashp Asset Management Ltd
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy, design, funding and installation of renewable energy systems including air source heat pumps, solar PV with battery storage, EV charging points, and energy management platforms,…
Serves B2B and public sector buyers, particularly housing associations, local authorities, property developers, architects, consultancies, and other commercial and not-for-profit organisations…
Financial Health
WeakWeak
Location
Nuvolt Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs commercial renewable energy systems including solar PV, battery storage and electric vehicle charging infrastructure. Provides consultancy, system design, installation and…
Serves UK businesses, commercial property operators, EPC contractors, and organisations with commercial, domestic or public charging facilities seeking low-carbon energy infrastructure.
Financial Health
StrongStrong · Hiring · 73% CAGR over 2y
Location
AMSER RENEWABLES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and installs renewable and energy‑efficient building systems, including solar photovoltaic and solar thermal systems, heat pumps, underfloor heating, biomass boilers, combined heat and power…
Serves businesses and organisations needing renewable and building services, including construction contractors, property developers, housing providers, education sites and public-sector clients,…
Financial Health
StrongStrong
Location
Evans Electrical Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services including design, installation, testing and commissioning of electrical systems for construction projects. Also installs lighting, fire and security systems,…
Serves building contractors and property developers across Wales, the West and beyond, with clients in education, residential, commercial, healthcare, industrial, logistics, sports and leisure…
Financial Health
HealthyHealthy · Profitable · -6% CAGR over 2y
Location
Green Heat Wales Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs renewable energy and heating systems including air and ground source heat pumps, solar PV and solar hot water, and biomass boilers, and provides plumbing, boiler and bathroom…
Serves B2C homeowners and property owners across Wales, particularly people seeking domestic renewable energy, plumbing and heating support through Cardiff and Brecon showrooms.
Financial Health
DistressedDistressed · -10% CAGR over 4y
Location
ZING ENERGY LTD
Trajectory
4y · 2023–NowFinancial sub-scores
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
Location
TEWDRIC ENERGY CYMRU LTD
Trajectory
1y · 2025–NowDesigns and installs solar photovoltaic (PV) systems, battery energy storage, and electric vehicle charging points for homes, businesses, and community projects, providing on‑site renewable…
Serves homeowners, businesses, councils, housing associations and local community groups across South Wales seeking solar, battery storage and EV charging solutions.
Financial Health
Insufficient historyInsufficient history
Location
MODERN ENERGY AND ELECTRICAL SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls and maintains solar energy systems, battery storage and electrical installations for residential, commercial and industrial properties. Provides electrical contracting, renewable energy…
Serves homeowners, commercial businesses and industrial clients seeking renewable and electrical project support, with stated coverage across South Wales, the West and nationwide.
Financial Health
StrongStrong
Location
Tim O'Brien (Newport) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical contracting services and renewable energy installations, including solar PV, battery storage and EV charging systems, for commercial, social housing, local…
Serves commercial clients, social housing providers, local authorities, education bodies and construction firms in South Wales and South West England.
Financial Health
StableStable · 0% CAGR over 2y
Location
EFS Systems (Uk) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services for commercial, industrial and domestic clients, including installation and maintenance of solar PV systems, EV charging infrastructure, electrical…
Serves B2B, public-sector and residential customers: commercial and industrial premises, SMEs, NHS/hospital estates teams, organisations requiring security systems, and homeowners, with South Wales…
Financial Health
HealthyHealthy · -3% CAGR over 2y
Location
INTERLEC SYSTEMS (NEWPORT) LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical installation and maintenance for domestic, commercial and industrial properties, including rewiring, fixed wire testing, data networks, fire alarms, security and CCTV systems,…
Serves domestic homeowners and landlords, plus commercial and industrial clients in South Wales, including care homes, healthcare, offices, commercial property, student accommodation and education.
Financial Health
StableStable · 0% CAGR over 2y
Location
ARC Electrical Engineering Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical engineering services including design, installation and maintenance for domestic, commercial and industrial systems. Conducts electrical inspection and testing, installs solar PV…
Serves domestic, commercial and industrial customers in South Wales, including local authorities, landlords, letting agents, private homeowners and workplaces.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Channel Electrical Systems Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic and commercial electrical installation and maintenance services, including solar panel systems, battery storage, EV charging points, rewiring, lighting, distribution board upgrades,…
Serves homeowners, landlords, offices and other commercial organisations across Wales, as well as public-sector buyers accessing the LHC retrofit and decarbonisation framework for residential…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
RCJ Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic, commercial and industrial projects, including system design, installation and maintenance. Installs solar photovoltaic and battery storage…
Sells to homeowners and businesses needing electrical, solar, battery storage, EV charging and maintenance services, including domestic, commercial and industrial clients. Serves property and project…
Financial Health
StrongStrong · Hiring · 14% CAGR over 4y
Location
Advanced Electrical Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for domestic, commercial and industrial projects, including installation, maintenance and testing. Also designs and installs solar photovoltaic systems, fire…
Serves domestic customers, commercial organisations and industrial clients across South Wales and the UK, including companies with premises and project-based electrical, mechanical, fire-safety,…
Financial Health
StableStable · -4% CAGR over 4y
Location
GIBSON SPECIALIST TECHNICAL SERVICES LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides installation, design, and servicing of heating and energy systems, including commercial and domestic heating, solar photovoltaic and solar thermal systems, heat pumps, and insulation.…
Serves housing associations, local councils, Welsh Government bodies, universities and social housing organisations across Wales, mainly public-sector and B2B clients managing housing and estate…
Financial Health
StableStable · 0% CAGR over 3y
Location
LIGHTHOUSE ELECTRICAL (WALES) LIMITED
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsProvides electrical contracting services including installation of CCTV systems, fire and intruder alarms, and photovoltaic solar panels, alongside electrical work such as rewiring, fault finding,…
Serves domestic, commercial and industrial clients in South Wales, including homeowners and businesses needing electrical, security, fire alarm and solar-related installations.
Financial Health
DistressedDistressed · 0% CAGR over 3y
Location
Fonicy Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs solar photovoltaic panels, battery storage systems, and electric vehicle charging points for residential, commercial, and industrial properties, and undertakes commercial…
Serves residential homeowners and commercial or industrial clients in Wales and West England seeking renewable energy upgrades for properties, business premises, roof space, or EV charging needs.
Financial Health
StrongStrong
Location
WOODLAND BUILDING & ELECTRICAL SERVICES BARRY LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial electrical and building services, including electrical installation, maintenance and system upgrades for business premises, as well as MCS-certified solar panel and renewable…
Serves businesses of all sizes and commercial property clients across South Wales, including organisations needing building, electrical and renewable energy support for their premises.
Financial Health
WeakWeak · -7% CAGR over 3y
Location
AMBERWELL MAINTENANCE SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical engineering services including design, supply, installation, testing and maintenance of building systems. Works on LV distribution, lighting, fire alarms, security…
Serves public sector and commercial clients in Wales, including NHS health boards, local authorities, education providers, offices, factories, warehouses and manufacturing facilities.
Financial Health
StableStable · 0% CAGR over 4y
Location
Styles Electrical Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, installation and maintenance of commercial and industrial electrical systems. Services include lighting and power installations, cable…
Sells to commercial and industrial businesses, including manufacturers, construction firms and other enterprises needing electrical services, as well as public sector clients such as local councils,…
Financial Health
StrongStrong · Growing, Hiring · 24% CAGR over 4y
Location
Laver Group Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides heating, electrical, and renewable energy installation and maintenance services. Installs solar PV and battery storage, heat pumps, EV charging points, smart meters and thermostats, and…
Serves domestic homeowners, public sector bodies and private sector businesses seeking low-carbon heating, electrical and renewable energy support, including decarbonisation and home energy upgrades.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
R&S ENERGY SOLUTIONS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsInstalls and maintains renewable energy and heating systems for residential and commercial properties, including solar panels and battery storage, air and ground source heat pumps, boilers, and…
Serves a mix of B2C and B2B customers, including homeowners and businesses across South Wales and beyond with properties needing heating, renewable energy, EV charging, plumbing or electrical support.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 3y
Location
HIGHADMIT PROJECTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical contracting services for commercial and public sector building projects, including system design, BIM coordination, installation and maintenance. Installs building…
Serves public- and private-sector organisations across the UK needing large, medium or small building projects, including education, police, transport, hospitality, student accommodation and…
Financial Health
StableStable · -4% CAGR over 4y
Location
HITCHINGS ELECTRICAL (COWBRIDGE) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including minor repairs, full rewires, shop fitting and commercial installations. Also installs solar panel systems and undertakes electrical work for…
Serves commercial and industrial organisations nationwide, including shop-fitting clients, alongside private domestic customers in Cowbridge, the Vale of Glamorgan and wider South Wales.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
HIGHLAND ELECTRIX (BRIDGEND) LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides construction, mechanical and electrical contracting services, including plumbing, heating and ventilation installation, electrical systems, CCTV and fire alarms, EV charger and solar…
Sells to commercial and industrial clients, businesses needing building services, security and electrical work, plus homeowners undertaking self-builds, extensions, solar or EV charger installations,…
Financial Health
DistressedDistressed · -6% CAGR over 2y
Location
MMN ELECTRICAL SOLUTIONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides domestic and commercial electrical services including wiring and rewiring, consumer unit upgrades, lighting installation, smoke detectors and fire safety systems, CCTV and security systems,…
Serves a mix of B2C and B2B customers, including homeowners, landlords, businesses, and commercial or industrial clients across South Wales and the UK.
Financial Health
StrongStrong
Location
MVR Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides multidisciplinary contracting services for construction and energy projects, including project management and turnkey property development. Supplies and installs scaffolding systems and…
Serves commercial and domestic property clients, including homeowners, commercial property owners, housing developers, housing associations, and partners in the construction and energy industries.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 4y
Location
CAMELOT ELECTRICAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including electrical installations, maintenance, electrical installation condition reports, fire alarm systems, data and communications cabling, access…
Sells to businesses and organisations across the UK, particularly in social housing, commercial and industrial sectors. Serves buyers managing refurbishment, maintenance and installation projects,…
Financial Health
DistressedDistressed · -90% CAGR over 2y
Location
PROLEC ENERGY SOLUTIONS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides domestic and commercial electrical services including lighting installation and upgrades, consumer unit replacement, rewiring, fault finding and repairs, and electrical inspection reports.…
Serves domestic customers and commercial organisations in Merthyr Tydfil and surrounding areas, including homeowners and businesses requiring compliant electrical contractors.
Financial Health
StrongStrong · Hiring · 58% CAGR over 2y
Location
SURGE ELECTRICAL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services including system design, installation, testing and maintenance. Services cover electrical installations, EICR inspections, EV charge point…
Serves commercial and industrial organisations across the UK, including education, healthcare, housing associations, facilities management, network operators, public sector bodies, retail, sport, and…
Financial Health
StrongStrong · Hiring · 6% CAGR over 4y
Location
A.M.E ELECTRICAL LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services for commercial, industrial and residential properties, including electrical installations and maintenance, data cabling, fire alarms, CCTV and access control…
Serves businesses, public-sector bodies, homeowners and landlords across the UK, including offices, warehouses, factories, commercial premises and domestic properties.
Financial Health
HealthyHealthy · -7% CAGR over 4y
Location
HIGHADMIT BUILDING SERVICES HOLDINGS LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsOperates as a holding company for a group providing electrical and mechanical engineering contracting. Activities include design and installation of building services systems, building management…
Serves public and private sector organisations across the UK, including education, police, commercial property, hospitality and infrastructure project clients needing mechanical, electrical and…
Financial Health
StrongStrong
Location
SOUTH WALES MAINTENANCE AND ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services for commercial and industrial clients, including site maintenance, machining and manufacture, pipework and ductwork, welding and fabrication,…
Serves B2B commercial and industrial organisations across South Wales and the UK, including facilities, construction and operations teams.
Financial Health
StableStable · -9% CAGR over 4y
Location
Advanced Contracts Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical installation services including solar panel systems, consumer unit upgrades, EICR electrical safety inspections, and installation of EV charge points and related smart home energy…
Serves homeowners, domestic property owners and landlords seeking electrical, solar, smart home, EV charging and safety inspection support.
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
Off Grid Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs off‑grid power systems using solar PV, battery storage and generators. Provides system design, turnkey installation, upgrades, and remote monitoring for homes, businesses and…
Serves homeowners, self-builders and rural property owners, plus businesses with remote sites such as workshops, holiday lodges and commercial premises needing off-grid power systems.
Financial Health
StableStable · 0% CAGR over 4y
Location
MOSS TECHNICAL SERVICES LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides electrical contracting services including electrical inspection and testing, security systems, data and networking installations, EV charging points, and solar and battery storage. Also…
Serves a mix of B2B and B2C customers: electrical installers and installation partners, homeowners, residents, and property management companies seeking specialist electrical and smart home project…
Financial Health
StableStable · -13% CAGR over 2y
Location
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How Cardiff Solar Installation companies work and how to sell to them
What they do
Solar installation firms make money from fixed-price project delivery rather than recurring subscriptions. Domestic jobs are usually priced per property, with margin spread across survey, design, equipment supply, electrical installation, commissioning and optional maintenance. Commercial and public-sector work tends to look more like contracting: a scoped site survey, a bill of materials, staged payments and handover documentation. Some revenue comes from call-outs, repairs, monitoring checks and battery or inverter upgrades, but the main commercial risk sits in estimating labour, equipment availability and roof conditions accurately before committing to a quote.
Who they sell to
Typical buyers are homeowners, landlords, facilities managers, estates teams, construction project managers and procurement officers. Smaller residential work is often won through local reputation, web enquiries and direct quoting, while larger commercial schemes usually involve site visits, written proposals and comparison against other electrical contractors. Decision-makers tend to care about payback assumptions, disruption to the site, proof of installation competence and aftercare. Public-sector and larger commercial opportunities can take longer because procurement teams need evidence of insurance, safety processes, financial stability and the ability to service South Wales after handover.
What they buy
Most Cardiff solar installers tend to spend on job management, quoting, customer relationship management, accounting, fleet management, stock control and workforce scheduling. Firms handling commercial work may also need design software, document control, health and safety support, tender-writing help, insurance advice and specialist recruitment for electrical and roofing roles. Hardware purchasing is a material category too, covering panels, mounting equipment, cabling, batteries, meters and safety gear. Service providers that understand project cash flow, site scheduling and aftercare obligations will usually sound more credible than generic suppliers selling to trades without recognising the commissioning and maintenance burden.
Why and how to sell to them
Buying intent often appears when installers move from one-off domestic work into repeat commercial projects, add maintenance packages, win public-sector tenders or take on more field staff. Pain points are fairly practical: quote accuracy, survey bottlenecks, parts availability, cash tied up in equipment, proof of safe commissioning and keeping customers informed when site dates move. Outbound messages tend to land better when they connect to margin protection, faster admin, fewer missed appointments or cleaner evidence packs for procurement. A Cardiff angle can help where the offer supports local coverage across South Wales rather than a generic national pitch.
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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