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HVAC Companies in Southampton: 331 Active Firms (2026)
HVAC companies in Southampton install, maintain and repair heating, ventilation, air conditioning and refrigeration systems across the city region.
Buying decisions tend to sit with facilities managers, property owners, building-services consultants and operations teams rather than household consumers alone. The most relevant suppliers combine field engineering capacity with repeat service work: planned maintenance agreements, callout cover, compliance documentation and project-led upgrades for offices, industrial units, public buildings and residential blocks. Engagements are usually local or regional, with revenue tied to labour availability, response times and the ability to keep installed equipment running across mixed property portfolios. For researchers, the useful split is often between specialist crews focused on service and repair, and mid-market contractors able to take on design-and-install packages alongside maintenance obligations.
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Southampton has 331 actively trading HVAC companies, giving the city a sizeable local contractor base rather than a thin set of occasional installers. Reported headcount totals 853 people, which points to a labour-intensive market where field engineers, schedulers and compliance administration sit behind most revenue. Scale remains concentrated: 5 firms report turnover above £5M, while 70 were incorporated since 2022. That mix suggests a broad base of younger and micro-scale operators, with only a small group large enough to bid for bigger commercial maintenance packages or multi-site property work.
Refrigeration, air-conditioning and ventilation work sits close to building-services compliance, so buyers usually look for evidence of engineer competence, refrigerant-handling controls, safe electrical practice and documented maintenance routines. Public-sector, industrial and commercial property customers tend to formalise those requirements through tender documents, framework-style procurement and service-level commitments. Residential work is less procurement-heavy, but still depends on trust, availability and aftercare. The market structure therefore favours operators that can manage field schedules, parts availability and paperwork, not just installation labour. Recurring maintenance also gives established contractors a route into upgrade projects when equipment reaches end of life.
The Southampton cohort appears likely to remain fragmented, with many operators built around local service relationships rather than national contracting platforms. Demand tends to be resilient where firms hold maintenance agreements with landlords, facilities managers and public-building operators, although labour availability and refrigerant compliance can constrain delivery. Newer entrants may find repair and small installation work easier to win than formal commercial contracts, where insurance, accreditation and response-time requirements narrow the field. Consolidation could continue at the margins, particularly where mid-market contractors want regional engineer coverage, but the sector still looks shaped by local reputation and repeat service performance.
331
Active firms
2026
5
Over £5M
annual revenue
70
New since 2022
recent incorporations
Key facts
About 1% of the trading cohort reports turnover above £5M (5 of 331 firms) — the rest sits below that revenue band.
21% of the cohort was incorporated since 2022 (70 firms), so a sizeable share is in its first few filing cycles.
Southampton HVAC contractors sit close to building services, facilities management and food-chain infrastructure, rather than operating only as domestic trades.
Buyer groups include offices, industrial units, hospitality venues and property managers that need heating and cooling systems kept usable and compliant.
Work spans installation, maintenance and repair of heating, ventilation, air conditioning and refrigeration systems across the city region.
The contractor base includes specialist installers, maintenance providers and broader building-services firms with different contract models.
Top Southampton HVAC companies
HOME & INDUSTRIAL HEATING SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of heating, ventilation and air conditioning (HVAC) systems for commercial buildings, including boilers, commercial gas equipment, plant rooms, hot and…
Serves businesses, main contractors and public-sector property operators, including offices, care homes, delivery facilities and commercial buildings needing heating, cooling, ventilation and…
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
Heatcomp Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides commercial gas engineering, heating, HVAC, air conditioning and plumbing services, including installation, maintenance, compliance checks and emergency repairs. Works with businesses,…
Serves business owners, commercial landlords, and facilities or asset managers responsible for commercial properties across the South Coast, including Hampshire, Dorset and West Sussex.
Financial Health
StableStable · Hiring · 22% CAGR over 4y
Location
Austin Heating Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and services commercial and industrial heating, air conditioning and ventilation systems. Provides oil and gas heating solutions, air handling systems, and ongoing…
Serves commercial and industrial organisations needing heating, air conditioning, ventilation and commercial catering support, including contract customers locally and nationally.
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
Gasworks Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing and repair of boilers and central heating systems; installs fireplaces and fires (gas, electric and solid fuel); supplies radiators, controls, cylinders and water…
Serves homeowners, landlords and commercial customers in Southampton and surrounding Hampshire areas needing heating, boiler, plumbing and fireplace support.
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
GA UK GROUP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical, mechanical, plumbing and heating contracting services including system design, installation and maintenance. Also installs fire and security systems, generators, pumps and…
Serves a mix of businesses and homeowners, including industrial sites, commercial property operators, airports, residential customers, commercial catering businesses, and clients with domestic or…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
HEATWORKS HEATING LTD
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsProvides installation, servicing and repair of gas and LPG boilers and central heating systems. Also offers powerflushing, air source heat pump installation, and boiler care plans and finance for…
Serves homeowners and residential customers in Southampton, Portsmouth and surrounding areas needing boiler, central heating and heat pump services.
Financial Health
StableStable · 0% CAGR over 2y
Location
R.G. BEATTIE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical contracting services including design, supply, installation and commissioning of building systems. Also undertakes main contracting works, renewable installations,…
Serves B2B clients in construction and property projects across the south of the UK, including developers, main contractors, facilities teams and commercial building owners needing electrical,…
Financial Health
StableStable · -70% CAGR over 4y
Location
VOYTEK PLUMBING AND HEATING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Kensington Bathrooms Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -16% CAGR over 4y
Location
AIR CONDITIONING SERVICES (SOUTH) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -65% CAGR over 4y
Location
N BROWN PLUMBING & HEATING LTD.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
SOUTHERN GREEN ENERGY GROUP LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · Profitable · 0% CAGR over 1y
Location
GHP SOUTH LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -69% CAGR over 4y
Location
A1 Complete Plumbing & Heating Ltd.
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · -21% CAGR over 3y
Location
Gassed Up Heating Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
R J K Plumbers Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
ZEBRA GAS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Southern Heat Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Best Building & Maintenance Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
WELLAND VALLEY GAS SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
Becketts Plumbing and Heating Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable · 0% CAGR over 3y
Location
UNITED GAS HEATING AND PLUMBING LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 44% CAGR over 3y
Location
Horus Mechanical Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
JP PLUMBING & HEATING CONSULTANTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Ignite Service Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · Hiring · 21% CAGR over 4y
Location
New Air Southern Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing and maintenance of air conditioning, refrigeration and ventilation systems for commercial, industrial and domestic buildings. Also conducts system design, equipment…
Serves commercial, industrial and domestic clients within a 70-mile radius of Southampton, including facilities teams and homeowners in areas such as Bournemouth, Portsmouth, Winchester and Salisbury.
Financial Health
StableStable · -4% CAGR over 4y
Location
FREEAIR SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and commissions heating, air conditioning, refrigeration and ventilation systems. Provides building facilities maintenance, temperature control solutions, F‑gas services,…
Serves M&E contractors, facilities managers, commercial building operators and domestic property owners needing heating, cooling, refrigeration, ventilation and renewable systems support.
Financial Health
StableStable · 2% CAGR over 4y
Location
Regal Environmental Systems Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, installs and maintains air conditioning, heating, ventilation and humidification systems for commercial environments. Supplies heat pumps, gas‑fired heating and heat recovery ventilation,…
Sells to businesses and some homeowners, mainly SMEs needing climate control in working environments. Targets offices, restaurants, data centres, clean rooms, fine art settings and sporting venues,…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
Monarch Air Conditioning Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, installs and services air conditioning, heating, ventilation and humidification systems for commercial and residential buildings. Supplies heat pumps, heat recovery ventilation and…
Serves SMEs, offices, restaurants, data centres, sporting venues and homeowners across Hampshire and nearby towns including Southampton, Portsmouth, Fareham and Basingstoke.
Financial Health
StrongStrong
Location
J Hillier Building Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides HVAC engineering services including design, installation, maintenance and repair of air conditioning, ventilation and heat pump systems. Works on residential, commercial and industrial…
Serves homeowners, commercial offices, retail premises, industrial sites and mechanical contractors, including projects connected to NHS and office refurbishments.
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
FORTH TECHNICAL SERVICES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains mechanical and electrical building services, including air‑conditioning, ventilation and heating systems. Provides commercial pipework installation, planned…
Serves large commercial estate owners and facilities teams, including education institutions, healthcare sites, offices and law firms needing mechanical and electrical building services support.
Financial Health
StrongStrong · Growing, Hiring · 21% CAGR over 4y
Location
FORTH HOLD LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains building services systems including heating, ventilation, air conditioning, combustion plant, pipework, and mechanical and electrical infrastructure for commercial…
Serves commercial and public-sector organisations managing built environments, including offices, schools and universities, heritage estates, healthcare facilities, defence sites and manufacturing…
Financial Health
StrongStrong
Location
Our MEP Co. Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical, electrical and public health (MEP) building services including system design, installation and maintenance. Also offers design-stage consultancy, facilities management, and…
Serves property developers, contractors, building owners and facilities teams in Hampshire across commercial, hospitality, education, culture, assisted living, ports and high-end residential projects.
Financial Health
StrongStrong
Location
CEI ELECTRICAL SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical, mechanical, and plumbing services including industrial, commercial, residential and marine electrical installations, heating and ventilation systems, gas and plumbing work,…
Serves local government bodies, schools, sports and civic facilities, private developers, defence organisations, builders, contractors, industrial and commercial businesses, plus domestic homeowners…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 2y
Location
Maximum Climate Control Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns, supplies and installs air conditioning and HVAC systems for domestic and commercial buildings. Provides ventilation and heat recovery systems, air source heat pumps, TM44 inspections, and…
Serves businesses and homeowners, mainly across southern England and the UK, including offices, restaurants, hotels, hairdressers, leisure centres, schools and organisations with server rooms.
Financial Health
StableStable · Hiring · 13% CAGR over 2y
Location
RAK Technical Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building maintenance and technical building services, including design, installation and servicing of air conditioning, refrigeration, ventilation, heating, plumbing and electrical systems,…
Serves homeowners, offices, factories and other domestic, commercial and industrial premises in Hampshire needing building maintenance, electrical, HVAC, refrigeration and renewable energy services.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 2y
Location
SKYLINES AIR CONDITIONING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs air conditioning and climate control systems for commercial and residential projects. Provides air and water source heat pumps, VRF/VRV systems, data centre cooling,…
Sells to businesses and property operators needing air conditioning, refrigeration and data centre cooling, and also serves homeowners in England seeking heat pump installations and access to…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Abel Environmental Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls and maintains renewable energy and HVAC systems for domestic and commercial properties, including solar PV panels, battery storage, air conditioning, refrigeration, ventilation, and air or…
Serves homeowners and commercial customers across Hampshire and the south of England, including businesses, housebuilders and property developments needing energy, heating, cooling and maintenance…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 4y
Location
Thomas Air Services (TAS) Ltd
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsDesigns, supplies, installs and maintains air conditioning, refrigeration and heat pump systems. Provides split and VRV/VRF air conditioning, retail and commercial refrigeration equipment, and…
Serves businesses with commercial premises, including retailers, hospitality/commercial kitchens and offices, alongside homeowners seeking residential air conditioning or heat pump installations.
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
Location
Economy Heating Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides commercial heating and plumbing services including boiler room installation, boiler servicing, gas system repairs, and fabrication work. Gas Safe registered engineers manage and maintain…
Serves businesses, landlords and facilities or property managers responsible for commercial properties across the South Coast and Midlands, especially sites with boiler rooms and commercial heating…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
AIR IMPROVE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, installs and maintains air conditioning and ventilation systems for residential and commercial properties. Services include HVAC installation, system maintenance, breakdown repairs, local…
Serves residential homeowners and commercial clients across the South and Southwest of England, including businesses needing air conditioning, ventilation, maintenance, breakdown support and…
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
Cooling FX Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsInstalls, services, and maintains commercial refrigeration and air conditioning systems. Provides equipment installation from design through commissioning, and offers ongoing maintenance and repair…
Serves commercial clients across the South of England and Wales, including food businesses, estate agency branches and other organisations needing refrigeration and air conditioning support.
Financial Health
StableStable · -7% CAGR over 4y
Location
Smh Plumbing And Heating Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides plumbing and heating services including boiler installation and servicing, bathroom fitting, air source heat pump installation, landlord gas safety checks, and commercial plumbing and…
Serves domestic customers, landlords and commercial clients in Southampton and across the South, including homeowners and property owners needing plumbing, heating and gas safety support.
Financial Health
StrongStrong · Hiring · 6% CAGR over 3y
Location
SOLUTIONS WATER AND AIR MANAGEMENT LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides commercial heating and plumbing engineering services and water treatment, including installation, maintenance and servicing of heating systems and management of hot and cold water systems…
Serves commercial customers such as businesses, property managers and facilities teams across Hampshire, Dorset and the South Coast needing building services support.
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
AQUA COOLING HIRE LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and services temperature control systems including process chillers, air conditioning units, boilers, heat pumps and cooling equipment. Also provides equipment hire,…
Sells primarily to businesses and public sector organisations needing temperature control equipment, including buyers in agriculture, automotive, food and beverage, manufacturing, pharmaceuticals,…
Financial Health
DistressedDistressed
Location
HYDRO HEAT SOUTH LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides installation, repair and servicing of domestic gas and oil boilers, central heating systems, and heating appliances including Aga and Rayburn cookers. Also offers plumbing services, landlord…
Serves homeowners and residential landlords in the New Forest, Lyndhurst and Southampton areas with domestic oil and gas heating appliances, boilers, cookers, Agas and landlord safety requirements.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
H2O Plumbing & Heating 1984 Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating services including boiler installation, servicing and repair, central heating systems, underfloor heating, bathroom installation, and solar and renewable heating…
Serves homeowners, landlords and small commercial customers needing plumbing, heating, bathroom and renewable installation or repair services in Eastleigh, Hampshire and nearby areas.
Financial Health
StableStable · -5% CAGR over 4y
Location
ADS COOLING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides air conditioning installation, maintenance and repair for residential, commercial and industrial premises. Supplies and installs systems from major manufacturers and offers servicing…
Serves homeowners, office managers, commercial premises and industrial operators across Hampshire and the UK, including warehouses and hazardous environments requiring ATEX-certified equipment.
Financial Health
WeakWeak · Hiring · 3% CAGR over 4y
Location
RFW Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides heating and electrical engineering services for domestic and commercial customers, including boiler installation, servicing and repairs, electrical installations, pipework and refurbishment…
Serves homeowners and landlords within 30 miles of Southampton and commercial organisations nationwide, including hospitality and retail chains such as restaurants, coffee shops, fast-food brands and…
Financial Health
HealthyHealthy · Growing, Hiring · 3% CAGR over 4y
Location
Galxc Cooling Services Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsProvides industrial and HVAC cooling solutions, including chillers, chilled water systems and temperature control equipment. Services include system design, supply, installation, commissioning,…
Serves UK businesses needing cooling infrastructure, including HVAC/building services contractors, refrigeration clients, industrial process operators, breweries, laboratories, data centres and…
Financial Health
DistressedDistressed · -16% CAGR over 1y
Location
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How Southampton HVAC companies work and how to sell to them
What they do
Southampton HVAC firms usually monetise a blend of labour, equipment supply and recurring service obligations. One-off installation and replacement projects bring project revenue, while planned preventive maintenance, emergency callouts and compliance visits create repeat income across commercial premises, housing blocks, schools, healthcare settings and industrial sites. Pricing tends to be quoted per job for installs, with maintenance sold as retainer-style agreements or scheduled service contracts. Margins depend on engineer utilisation, parts mark-up, warranty exposure and travel time across the local service area, so firms often prefer contracts that give predictable workloads rather than only reactive repairs.
Who they sell to
Most sell to property owners, managing agents, facilities managers, estates teams and building-services consultants, with household work sitting alongside rather than replacing commercial demand. Smaller jobs are often approved by site managers or landlords, while larger retrofit, ventilation or plant-room projects tend to involve consultants, finance teams and formal procurement. Public-sector and industrial buyers usually ask for insurance, accreditations, risk assessments, method statements and service-level commitments before appointing a contractor. Sales cycles can be short for urgent repair work, but planned maintenance and project-led upgrades usually need surveys, quotations, site access checks and internal approval.
What they buy
Most HVAC firms tend to spend on tools that reduce scheduling friction and keep engineers chargeable: field-service management, job dispatch, mobile work orders, route planning, fleet management and parts inventory. Finance and admin teams also need quoting, invoicing, credit control, payroll, HR and training records, especially where engineers require certification tracking. Firms with commercial contracts often buy compliance documentation support, health and safety advice, insurance, accountancy, legal services and bid-writing help. Marketing spend is usually local and intent-led, covering search visibility, review management and property-sector networking rather than broad brand campaigns.
Why and how to sell to them
HVAC buyers tend to evaluate suppliers when service workload starts outgrowing spreadsheets, when a new maintenance contract adds reporting obligations, or when engineer recruitment creates more coordination risk. Other triggers include a move into public-sector tenders, a new operations lead, expansion into nearby towns, or a backlog of quotes and callouts that is affecting response times. Outbound messaging works better when it speaks to utilisation, missed appointments, first-time fix rates, certification evidence and cash collection rather than generic growth language. A practical hook is to show how the offer reduces admin between the office, the engineer and the customer site.
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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