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Oil and Gas Companies in Glasgow: 81 Active Firms (2026)
Oil and gas companies in Glasgow provide extraction, engineering, services and supply-chain support for energy assets across the metropolitan area.
Buying centres tend to sit with engineering, operations, procurement and commercial teams rather than end-consumer channels. Glasgow suppliers in this category sell into national energy-sector customers that need inspection, maintenance, equipment, logistics, decommissioning advice and commercial support around safety-critical assets. The sales motion is usually relationship-led and tender-led, with evidence requirements around technical competence, site access, insurance, certification and delivery history. Engagements are more likely to be project, framework or retained advisory work than low-touch purchasing, so the relevant buyers are mid-market and enterprise operators, contractors and industrial supply-chain managers.
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Glasgow has 81 actively trading oil and gas companies in this list, a compact local cohort with a visible employment footprint. Reported headcount across the group totals 1,097, which points to a base of lean technical, field and commercial teams rather than a city dominated by very large operating companies. The shape is consistent with a metropolitan supply-chain market: specialist service providers, consultants, equipment businesses and maintenance contractors serving UK energy customers from a Glasgow base.
Licensing, health-and-safety, environmental permitting and tax treatment shape the market, even where a Glasgow business is not itself an asset owner. Service providers still inherit customer requirements around site safety, audit trails, competent-person evidence, subcontractor control and incident reporting. Decommissioning work adds another layer of scrutiny because commercial delivery depends on documentation, waste handling, assurance and coordination across industrial sites. For researchers, that means a revenue threshold alone is a blunt screen: small technical teams can be relevant if they sit close to regulated maintenance, inspection or engineering workflows.
Future activity appears more likely to come from maintenance, inspection, decommissioning and specialist supply-chain support than from a broad new wave of local operators. The cohort tends to be operationally lean, so hiring may follow contract wins rather than speculative expansion. Buyers are likely to keep pressing suppliers on safety evidence, delivery history and cost control, especially where work touches regulated assets. Consolidation is plausible in the more commoditised service lines, while technical consultancies and equipment specialists may stay independent if they retain defensible expertise and direct relationships with national energy customers.
81
Active firms
2026
9
Above £5M
Reported revenue
15
Incorporated since 2022
Younger firms
Key facts
About 11% of the trading cohort reports turnover above £5M (9 of 81 firms) — the rest sits below that revenue band.
18% of the cohort was incorporated since 2022 (15 firms), so a sizeable share is in its first few filing cycles.
Glasgow’s oil and gas suppliers span extraction support, engineering, services and supply-chain work for energy assets across the metropolitan area.
Market mapping tends to separate engineering-led contractors from field-service and supply-chain operators, as these groups sell through different procurement routes.
Some entities appear revenue-heavy, while others look more like staffed engineering or field-service operations.
Top Glasgow oil and gas companies
Provides oilfield services and equipment for exploration and production operations, including coring systems, drilling tools, well intervention services and well monitoring technologies. Also…
Serves B2B exploration and production operators, large oilfield service companies, and carbon capture well operators involved in drilling, completions, production, and well monitoring operations…
Location
Weld-Spec (Glasgow) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides non‑destructive testing (NDT) and heat treatment services for industrial fabrication and energy projects. Services include visual weld inspection, ultrasonic and phased array testing,…
Serves B2B clients in the oil, gas and major fabrication sectors, including main oil companies and contractors on onshore and offshore projects across the UK, Europe and the Middle East.
Financial Health
DistressedDistressed · -25% CAGR over 2y
Location
Fabri Consulting Engineers Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering consultancy services for downstream oil and fuel facilities, including engineering design, project management, construction supervision and commissioning. Conducts hazardous area…
Serves B2B clients in the downstream oil and fuels sector, including major oil companies, terminals, ports and airport fuel operations across the UK, Europe, Asia and Africa.
Financial Health
WeakWeak · -3% CAGR over 4y
Location
Weldspec (Baku) ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides non-destructive testing and heat treatment services for industrial and energy projects. Conducts weld inspection, ultrasonic, radiographic, magnetic particle, dye penetrant and eddy current…
Serves major oil and energy companies, EPC contractors and fabrication project operators with onshore and offshore assets across the UK, Europe and the Middle East.
Financial Health
StableStable · -16% CAGR over 3y
Location
R.I.G. Fabrication Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides fabrication, repair and refurbishment of oilfield drilling equipment. Offers shop and field mechanical services, inspections, equipment unitisation, engineering and drafting, and supplies…
Serves oil and gas companies, drilling contractors and oilfield service firms operating land and offshore rigs, particularly buyers responsible for mechanical drilling equipment, mud pumps, parts and…
Financial Health
WeakWeak · -2% CAGR over 4y
Location
PCS (SCOTLAND) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies pressure control equipment and spare parts for the oil and gas industry, including BOP components, gate, choke and check valves, accumulator bottles and high‑pressure equipment. Also…
Serves B2B customers in the oil, gas and oilfield services sectors worldwide, including offshore and subsea operators, rig and FPSO projects, and industrial buyers needing pressure control equipment,…
Financial Health
StrongStrong · Hiring · 3% CAGR over 4y
Location
CORE LAB + LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides laboratory analysis, reservoir evaluation, and production optimisation services for the petroleum industry, including core and fluid analysis, completion diagnostics, inspection of crude oil…
Sells to B2B customers in the energy sector, especially oil and gas operators, engineers, geologists, geophysicists and completions teams. Also serves clients involved in CCS, crude oil and petroleum…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
Petrasco Energy
Provides logistics and freight forwarding services for the energy industry, including air, sea and road transport, offshore logistics, warehousing and distribution, project forwarding, export…
Serves B2B customers in the oil, gas and wider energy industry, including operators and suppliers needing urgent global logistics for vital components, materials and equipment, including offshore…
Location
Completion Products Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures downhole cable and control line protectors used in oil and gas wells. Provides engineering design and consultancy for protective systems that secure cables and control lines…
Serves upstream oil and gas companies, including well completion teams, operators and service providers requiring downhole cable and control line protection for drilling and production environments.
Financial Health
HealthyHealthy · Growing, Hiring · 18% CAGR over 2y
Location
Hydropulsion Limited
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures downhole tools for oil and gas well intervention operations, including rotating washtools, circulating subs, gas separation systems, milling tools, nozzle inserts, and…
Sells to oil and gas operators, drilling teams, coiled tubing service providers and well intervention contractors needing downhole tools for wellbore operations.
Financial Health
StrongStrong · Hiring · 7% CAGR over 6y
Location
TI UK Contracting Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides industrial and marine insulation systems, including cryogenic insulation for LNG, LPG and LEG cargo tanks, fuel tanks and pipelines. Designs and supplies panel and spray foam insulation…
Serves shipyards, vessel owners/operators and energy infrastructure clients in maritime and land-based cryogenic sectors, including LNG/LPG/LEG carriers, fuel-tank projects, naval vessels and LNG…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
Casinro Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Manufactures and distributes high‑performance alloy materials and engineered components. Provides machining, forging, heat treatment, additive manufacturing, inspection and assembly services,…
Serves B2B customers in oil and gas, chemical processing and energy, including upstream, midstream and downstream operators and suppliers with critical operational requirements.
Location
Express Fuels (Scotland) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsSupplies bottled gas, LPG cylinders, industrial and drinks‑dispense gases, auto gas and camping gas to domestic, commercial and industrial customers. Also sells solid fuels, welding products, gas…
Serves domestic, commercial and industrial customers within a 50-mile radius of Glasgow, including pubs, welders, LPG users, motorists needing autogas, campers and households needing bottled gas or…
Financial Health
WeakWeak · -7% CAGR over 2y
Location
EMAC ENGINEERING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and fabrication services including welding, pipe fabrication, sheet metal work, insulation and cladding, and mechanical services. Works with sectors such as oil and gas,…
Serves B2B industrial clients in the UK and internationally, particularly organisations in oil and gas, manufacturing, utilities, distilling and renewables sectors needing engineering project support.
Financial Health
StableStable · 2% CAGR over 4y
Location
AH Asset Solutions Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides asset evaluation and disposal services for oil and gas companies, managing sales of surplus and end‑of‑life equipment through auctions and marketplace listings, including OCTG and industrial…
Serves major oil and gas producers disposing of surplus, end-of-life or redundant assets, and qualified buyers seeking used industry equipment through auctions and marketplace sales.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 3y
Location
TARIFA CONTROLS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering services including design, manufacture and commissioning of electrical and electronic control panels, specialising in SCR drive systems. Also carries out system upgrades, repair,…
Serves B2B clients in oil and gas, automation, food and drink, pharmaceutical, and naval/marine sectors, including drilling contractors, platform/rig operators, distilleries and manufacturers.
Financial Health
StableStable · 0% CAGR over 4y
Location
Trajectory
2y · 2020–NowFinancial sub-scores
Computed from 2 filingsManufactures and distributes high‑performance alloy materials and engineered components. Provides machining, forging, heat treatment, additive manufacturing, inspection and assembly services,…
Serves B2B customers in the oil, gas, chemical processing and energy sectors, including upstream, midstream and downstream operators and suppliers.
Financial Health
StableStable · 0% CAGR over 1y
Location
RDH SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
SANTANE LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and technology consulting services for energy and industrial sectors. Offers engineering design and drafting, HSE and risk consulting, energy transition support, digital twin and…
Serves B2B clients in high-hazard and regulated industries, including renewables/offshore wind, power and energy, oil and gas, refineries and petrochemicals, hydrogen, nuclear and defence, and food,…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
SCIENCESOFT INTERNATIONAL LIMITED
Trajectory
5y · 2020–NowDevelops 3D reservoir simulation and analysis software for the oil and gas industry, including tools for chemical enhanced oil recovery modelling, workflow management, and post‑processing of…
Serves oil and gas companies, reservoir engineering teams, and academic users involved in oil reservoir modelling, field planning, and chemical enhanced oil recovery projects.
Financial Health
Insufficient historyInsufficient history
Location
J Ren Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides energy consulting services to oil and gas companies, including subsurface interpretation and mapping, reservoir modelling and simulation, field development planning, and energy management…
Serves upstream oil and gas and broader energy companies in North America and global markets, targeting asset owners and project teams needing technical, reservoir, field development and energy…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Malin Group Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides marine engineering and project services including concept and feasibility studies, bespoke marine equipment design and fabrication, heavy lift engineering, marine transportation, load‑out…
Serves B2B clients in the marine, offshore, shipping and heavy-lift sectors, including maritime supply-chain firms, vessel builders, infrastructure project teams and defence contractors managing…
Financial Health
StrongStrong · Hiring · 10% CAGR over 2y
Location
Howco
Manufactures and distributes high‑performance alloy materials, tubing and precision‑machined components. Provides services including forging, heat treatment, deep hole boring, CNC machining, additive…
Serves B2B customers in oil and gas, chemical processing, energy and aerospace sectors that require high-performance alloy materials and precision components for demanding operating environments.
Location
Grant's Welding Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -16% CAGR over 4y
Location
Caledonian Turbine Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies replacement parts and control cards for heavy‑duty gas and steam turbines, including GE Speedtronic systems. Provides engineering consultancy and delivers technical and management training…
Serves global B2B operators of heavy-duty gas and steam turbines, especially power generation and petrochemical companies using GE Speedtronic control systems and needing replacement parts, training…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
TEE SQUARE 4 LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides engineering and technical services for industrial and residential projects, including corrosion control, epoxy flooring installation, HVAC system design and maintenance, chemical supply and…
Serves B2B industrial clients, especially oil, gas and power operators, plus residential property owners needing engineering project support, facility maintenance and procurement-related services.
Financial Health
StableStable · 0% CAGR over 2y
Location
Ti Con Group Companies Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and supplies insulation systems for marine and industrial applications, including cryogenic insulation for LNG, LPG and LEG cargo tanks, fuel tanks and pipelines. Provides panel and spray…
Serves shipbuilders, naval shipyards, vessel owners/operators and energy infrastructure projects in the maritime and land-based LNG/LPG/LEG sectors, including cargo, fuel/bunker tank, terminal and…
Financial Health
StableStable · -22% CAGR over 2y
Location
NRN Glasgow Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
HEBRIDEAN MARINE SERVICES LTD
Trajectory
2y · 2025–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
Safewell Services Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
ABERDELL INTERNATIONAL UK LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Integrity Engineering (Scotland) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering manufacturing and technical services for the oil, gas and energy sectors, including CNC machining, welding and fabrication, valve and actuator supply and refurbishment, equipment…
Serves B2B customers in the oil, gas and energy sectors, including operators, subsea/riser equipment owners, and engineering, procurement and maintenance teams worldwide.
Financial Health
StableStable · -7% CAGR over 4y
Location
QUALITAS INTERNATIONAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides modular and prefabricated oil and gas production facilities and equipment for upstream petroleum projects, including turnkey plant design, equipment procurement, heavy‑lift cargo logistics,…
Serves B2B upstream oil and gas operators and energy project owners, particularly those developing petroleum reserves and remote international production assets in markets such as Gabon, Kazakhstan…
Financial Health
DistressedDistressed · -13% CAGR over 2y
Location
UMS Flowell UK Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures downhole completion equipment for oil and gas wells, particularly systems supporting electric submersible pumps (ESP). Supplies bypass tools, motor cooling and casing…
Serves oil and gas operators, oilfield service companies and well completion teams worldwide, particularly those managing electric submersible pump and natural-flow oil wells.
Financial Health
WeakWeak · Hiring · 13% CAGR over 2y
Location
TEESSIDE FLUID SYSTEM TECHNOLOGIES LIMITED
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsSupplies fluid system components including fittings, valves, regulators, and tubing, and provides engineering services such as system evaluation, design, fabrication, installation, asset integrity…
Serves B2B industrial customers needing fluid system components, engineering support and training, particularly in chemical/petrochemical, oil and gas, semiconductor, clean energy and defence sectors…
Financial Health
StableStable
Location
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsDesigns and supplies water treatment systems and energy recovery solutions for offshore oil and gas installations. Provides customised process packages covering seawater intake, treatment and…
Serves offshore oil and gas operators and project contractors, particularly fixed and floating installation owners needing process packages for seawater treatment, injection water and energy recovery.
Financial Health
StableStable · -67% CAGR over 3y
Location
Asset One Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides asset management, engineering project delivery, and technical services for operators in high‑hazard industries. Offers consultancy, expert secondment, maintenance and reliability support,…
Serves B2B asset operators and contractors in high-hazard industries, especially oil and gas, drilling and critical infrastructure, targeting operations, maintenance, reliability and compliance teams.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
McNair Engineering Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering services including manufacture and repair of hydraulic equipment, hydraulic cylinders, rig skidding and BOP handling systems. Also designs and builds hydraulic power units and…
Serves industrial B2B customers, including offshore oil and gas operators, hydraulic equipment users, industrial gas turbine operators, engineering firms, and organisations needing subcontract…
Financial Health
StableStable · -10% CAGR over 4y
Location
UMS Flowell Holdings Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns and manufactures downhole completion equipment for oil and gas wells, particularly electric submersible pump (ESP) systems, including bypass tools, motor cooling and casing isolation…
Serves B2B oilfield customers worldwide, including oil and gas operators, drilling/completions teams and service companies involved in electric submersible pump and natural-flow well projects.
Financial Health
StrongStrong · Hiring · 339% CAGR over 2y
Location
GCH Precision Engineering Ltd.
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides precision engineering and bespoke manufacturing services including machining, heavy vertical and horizontal boring, repair and rework, machine tool maintenance, and breakdown support.…
Serves B2B industrial customers, particularly blue-chip and OEM oil and gas companies, plus firms with heavy manufacturing, tubular/casing, machine-tool and plant maintenance requirements.
Financial Health
HealthyHealthy · -21% CAGR over 2y
Location
Northern Marine
Provides ship management and marine support services for maritime and offshore operators, including technical and crew management for gas, oil, chemical, passenger and offshore vessels, plus…
Serves B2B maritime and offshore clients, including leading ship owners, energy majors, vessel operators and shipping-group companies with gas, oil and chemical, offshore and passenger fleets.
Location
Trajectory
3y · 2022–NowSupplies and stocks seamless carbon steel pipes and tubular products, including line pipe, low‑temperature pipe and structural tubulars. Provides materials for petrochemical, oil and gas, offshore…
Serves B2B customers in petrochemical, offshore and onshore oil, and construction sectors, including North Sea and international project buyers needing carbon steel tubular supply.
Financial Health
Insufficient historyInsufficient history
Location
EGCINSPECTION LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong
Location
JHal Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Ams Equipment Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsSupplies monitoring and detection equipment for the oil and gas industry, including gas detection systems, calibration gases, oil‑in‑water analysers, pressure transmitters, process instrumentation…
Sells to oil and gas companies, offshore operators and other industrial businesses, including plants managing shutdowns or upgrades and teams responsible for safety, environmental and process…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 3y
Location
IODS PIPE CLAD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides metal fabrication services for the oil, gas and petrochemical industries, specialising in pipe cladding, induction bends, and non-destructive testing and inspection, and supplying clad line…
Sells to businesses in the global oil, gas and petrochemical sectors, including pipeline operators, EPC contractors and industrial buyers needing clad pipe, bends, elbows, fittings and inspection…
Financial Health
WeakWeak · -74% CAGR over 4y
Location
Ansell Jones Marine Services Ltd.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and manufactures lifting and mooring equipment for offshore, marine and nuclear industries, including blocks, sheaves, winches, cranes and hoists, shackles, hooks and deck fittings, and…
Sells to B2B customers in the offshore, marine and nuclear sectors, including buyers needing safety-critical lifting, rigging and mooring equipment for harsh operating environments in the UK, Europe…
Financial Health
WeakWeak · -8% CAGR over 4y
Location
Gut4 Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
WeakWeak · 0% CAGR over 1y
Location
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How Glasgow oil and gas companies work and how to sell to them
What they do
Glasgow oil and gas suppliers usually earn revenue from engineering services, inspection visits, maintenance projects, equipment supply, logistics coordination, decommissioning support and consultancy. Pricing tends to mix day-rates, time-and-materials work, fixed-price scopes and call-off arrangements under framework agreements. Equipment businesses may add margin on sale, hire, calibration or spares, while advisory firms charge for feasibility work, assurance packs and commercial negotiation support. Ticket size is usually shaped by asset access, shutdown windows, specialist labour and documentation burden; a small survey can be approved locally, while site work tied to regulated assets normally passes through procurement and technical review.
Who they sell to
Their customers are typically upstream and midstream operators, industrial asset owners, larger engineering contractors, marine and logistics groups, and energy-sector procurement teams. Buyers rarely sit in marketing or consumer channels; the practical sponsors are operations directors, asset managers, engineering managers, health, safety and environment leads, supply-chain managers and commercial teams. Direct sales and warm referral still matter, but formal qualification often comes through approved-supplier lists, framework tenders and RFP processes. Sales cycles tend to lengthen when site access, insurance, method statements, competency evidence or security checks are needed, so early conversations often test risk, delivery history and commercial fit before price.
What they buy
Most oil and gas service firms tend to spend on systems that reduce administrative drag around projects, people and compliance. Common buying areas include CRM, bid management, contract management, project controls, field service scheduling, asset and maintenance management, document control, quality management, health and safety reporting, finance, payroll and procurement software. Cybersecurity, cloud hosting, data backup and device management matter where engineers, inspectors and commercial staff work between offices, customer sites and vessels. External services usually cluster around accountancy, tax, legal review, insurance, certification support, training, recruitment, technical writing, marketing for tenders and specialist subcontract labour.
Why and how to sell to them
Oil and gas buyers tend to evaluate vendors when workload changes expose friction: a framework win, a new decommissioning package, a customer audit, a move into higher-liability site work, or a finance and operations team struggling to reconcile project margins. Outbound usually works better when it names the operational trigger rather than a generic growth claim. Useful angles include shortening tender response time, making competency evidence easier to reuse, reducing invoice leakage, improving subcontractor oversight and giving managers a clearer view of field utilisation. Proof points need to be practical: sector familiarity, implementation burden, integration requirements and evidence that the supplier can work around live project delivery.
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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