Turn this list into pipeline.
Public Sector Companies in London: 1,800+ Active Firms (2026)
Public-sector companies in London supply goods and services to government, health, education, housing, utilities and emergency-service buyers.
Buying centres tend to sit in procurement, finance, estates, digital, operations and programme-delivery teams, with legal and information-governance review often pulled in before award. Sellers usually face business-to-public-sector motions rather than consumer demand: framework entry, tender responses, evidence packs, implementation plans and service-level commitments matter as much as the underlying service. The customer base ranges from central and local government to health, education, housing, utilities and emergency services, but the commercial pattern is broadly similar. Engagements are rarely impulse purchases; even specialist assignments can involve multi-stakeholder sign-off, formal evaluation criteria and renewal or extension mechanics that reward delivery capacity over pitch polish.
Read more
Around 1,800 public-sector suppliers are actively trading in London, giving the capital a sizeable, but still selective, pool of firms oriented around public and utility-sector demand. Reported employment totals 1,729 people among firms that publish headcount, pointing to a supplier base with many lean operators alongside a smaller group able to staff contract delivery, mobilisation and account management. The London concentration also matters for buyers because central government, national health administration, transport, housing and professional-services procurement functions are reachable within the same labour market, even when delivery work takes place outside the capital.
Procurement rules, rather than a sector licence, set the main market structure for London suppliers. The current Procurement Act regime changes how public bodies buy goods and services, with more standardised competitions, a competitive flexible procedure, wider payment-term flow-down through supply chains and more consistent feedback for final-tender bidders. It also makes digital publication and oversight more central to supplier behaviour: bid teams need auditable pricing, exclusion-ground checks, conflict controls and evidence of delivery capability before a tender closes. For smaller suppliers, the compliance load can be manageable, but it tends to favour firms that have repeatable bid processes rather than ad hoc sales effort.
Demand appears tied less to discretionary experimentation than to public bodies’ need to replace ageing services, meet statutory duties and manage cost pressure. That should keep procurement disciplined, with buyers asking for proof of delivery, resilience and value for money rather than novelty. The cohort’s shape suggests a long tail of newer or lean suppliers, while the firms with public references and contract-management capacity are better placed to win repeat work. Consolidation may occur where outsourcing, facilities, consultancy and technology delivery overlap, though public procurement scrutiny tends to slow any shift from fragmented supply towards larger contract-holding groups.
1,800
Active firms
2026
18
Above £5M
turnover threshold
673
Since 2022
recent incorporations
Key facts
About 1% of the trading cohort reports turnover above £5M (18 of 1,800 firms) — the rest sits below that revenue band.
37% of the cohort was incorporated since 2022 (673 firms), so a sizeable share is in its first few filing cycles.
From 24 February 2025, the Procurement Act 2023 changed how public bodies buy goods and services, including more standardised procurement processes and a competitive flexible procedure.
GOV.UK identifies Find a Tender as the central digital platform for public procurement opportunities.
HM Treasury reported gross current procurement of £157.3 billion in 2023-24, alongside staff costs of £178.3 billion.
ONS estimated 5.94 million UK public-sector employees in June 2024, up 76,000, or 1.3%, compared with June 2023.
OECD’s Government at a Glance 2025 search summary reports general government expenditure averaging 42.6% of GDP across OECD countries in 2023.
Top London public sector companies
Provides facilities management and building support services for businesses and public sector organisations, including cleaning, security guarding, engineering maintenance, energy management,…
Serves large UK businesses and public sector organisations, including financial services, manufacturing, telecoms, pharmaceuticals, retail, transport, utilities, central and local government,…
Location
Provides engineering, consultancy and infrastructure services including design, data analytics, project management, operations, maintenance and decarbonisation for transport networks, public…
Serves UK public-sector bodies and infrastructure owners/operators in roads, rail, defence, justice, education, health and aviation, including organisations responsible for public buildings,…
Location
Provides engineering, consultancy and operations services for infrastructure and public facilities, including roads and rail networks. Services include planning, design, data analytics, project and…
Serves UK public-sector bodies and infrastructure owners/operators in roads, rail, defence, justice, education, health and aviation, as well as organisations managing complex public buildings and…
Location
Provides engineering, consultancy and asset management services for infrastructure and complex facilities. Activities include design, data analytics, project management, operations and maintenance,…
Serves UK public-sector bodies and infrastructure owners/operators in roads, rail, defence, justice, education, health, aviation and complex public facilities.
Location
CDW UK
Provides IT products and services including hardware and software procurement, cloud and data centre solutions, networking, cybersecurity, and managed IT services. Also offers consulting, device…
Serves UK public sector bodies and private organisations, including central and regional government, defence, education, emergency services, healthcare, housing, large enterprises, mid-market…
Location
Provides facilities management services including building maintenance, cleaning and hygiene, security guarding, fire and security systems, energy and decarbonisation support, engineering…
Serves large UK organisations across business, industry and public sectors, including financial services, manufacturing, retail, transport, utilities, central/local government, defence, education and…
Location
Amey
Provides engineering, consulting, project management and operations services for infrastructure and complex facilities. Activities include infrastructure design, asset management, maintenance, data…
Serves UK public-sector bodies and infrastructure owners/operators in roads, rail, defence, justice, education, health and aviation, plus organisations managing complex facilities and critical assets.
Location
MTC Group
Provides services in criminal justice, immigration and asylum, healthcare, and education and training. Delivers skills-based learning, employment support, and rehabilitation programmes for people in…
Serves UK public sector commissioners and partner organisations in criminal justice, immigration and asylum, healthcare, education, training and employment services, with vulnerable people as end…
Location
DATA HOSTING LTD
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides government‑accredited data centre and colocation services for public sector organisations, supplying secure facilities, power, cooling and connectivity for hosting IT infrastructure, AI and…
Serves UK public sector organisations buying data centre services through Cabinet Office access agreements, and private sector suppliers that resell these services as part of offerings to government…
Financial Health
WeakWeak
Location
Provides facilities management and building services including engineering maintenance, cleaning and hygiene, security guarding and fire systems, energy management, waste and landscaping, and…
Serves B2B and public sector buyers needing facilities, estates, energy, security and workplace services, including central and local government, defence, education, healthcare, transport, utilities,…
Location
TASCOR SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides business process outsourcing and facilities management services for the criminal justice and public safety sector, including custody support, security systems, building maintenance,…
Serves public sector organisations in secure, high-demand environments, particularly police forces, fire and rescue services and criminal justice bodies managing operational estates.
Financial Health
DistressedDistressed · -19% CAGR over 4y
Location
CDW UK
Supplies IT hardware and software and provides technology consulting, cloud, networking, cybersecurity and workplace solutions. Delivers system integration, procurement, device lifecycle management,…
Serves UK public sector organisations, large enterprises, corporate and mid-market businesses, and retailers, including central government, defence, education, emergency services, healthcare, housing…
Location
Stay Belvedere Hotels Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides temporary accommodation and guest services, primarily supporting UK government asylum accommodation programmes. Delivers facilities management, security, logistics, catering, transport, IT…
Serves central and local government bodies, plus community groups, voluntary organisations and charities involved in temporary accommodation and support for asylum seekers across the UK.
Financial Health
DistressedDistressed · -20% CAGR over 5y
Location
INFOSHARE+ BIDCO LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides data management and digital software for public sector organisations, including social care assessment tools, financial assessment systems, data integration platforms, analytics dashboards,…
Serves public sector organisations, especially local authorities and local public services, including adult and children’s social care, finance, revenue and benefits, council tax teams, fire and…
Financial Health
WeakWeak · Hiring · 172% CAGR over 1y
Location
Provides engineering, consultancy, and asset management services for transport infrastructure and public sector facilities. Services include design, data analytics, project management, operations and…
Serves UK public-sector bodies and infrastructure operators, including roads and rail authorities, defence, justice, education, health, aviation and owners of complex facilities.
Location
POLICE DIGITAL SERVICE
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsCoordinates and delivers digital technology services for UK policing, including cybersecurity operations, cloud platforms, mobile app management, digital forensics validation, IT services, and…
Serves UK police forces, law enforcement organisations, national policing partners and policing-related industry stakeholders involved in national digital, data and technology programmes.
Financial Health
StableStable · Hiring · 14% CAGR over 1y
Location
GENMED CAPITAL MANAGEMENT LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides procurement, equipment sourcing and administrative support services to NHS trusts and healthcare providers, including managed equipment services for surgery, pathology and other departments,…
Serves NHS Trusts, health boards, public bodies and private healthcare providers, particularly hospital surgery, pathology, endoscopy, cardiology, imaging, renal and point-of-care departments.
Financial Health
WeakWeak · -18% CAGR over 2y
Location
Destine Solutions Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops software and data services for local authorities, including systems for inspections and workflow management, debt recovery and reporting, council tax and business rates administration, visit…
Serves UK local authorities, councils and public-sector partnerships, particularly revenues, benefits, council tax, NNDR, debt recovery, enforcement and performance management teams; also works with…
Financial Health
StrongStrong
Location
Provides debt collection and enforcement services for public sector and commercial clients. Recovers council tax, business rates, penalty charge notices, court fines, and other debts, and offers…
Serves UK public-sector organisations, including central government, local authorities, HMCTS, Transport for London and road-user charging bodies, plus commercial landlords and businesses with debt…
Location
EURO PARKING COLLECTION PLC
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides enforcement and payment processing services for traffic and road user charges issued to foreign‑registered vehicles, including parking penalties, tolls, congestion charges and low‑emission…
Serves public-sector transport, traffic, civic and police authorities, plus road toll and user-charging operators, that need support with foreign-registered vehicle contraventions and payments.
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
EVALUCOM CONSULTING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides digital software and data analysis for NHS and public sector commissioners, including the CarePulse market management platform, plus consulting on health and social care markets, cost…
Serves NHS and public sector health and social care commissioners managing Continuing Healthcare, care home, domiciliary care and AQP markets, with engagement across provider networks.
Financial Health
HealthyHealthy · 1% CAGR over 5y
Location
CDW UK
Provides IT products and services including cloud platforms, networking infrastructure, cybersecurity, data centre solutions, end‑user devices, and software. Also delivers IT consulting, system…
Serves UK public sector organisations, including government, defence, education, healthcare, housing and emergency services, plus large enterprises, mid-market corporates and retail businesses.
Location
KIM Software Solutions Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDevelops cloud‑hosted software for case management, incident reporting, evidential property tracking, records and archive management, and facilities management. Systems support police, emergency…
Serves public and private sector organisations, including HM Government, UK and overseas police forces, emergency services, universities, colleges, healthcare providers, and organisations needing…
Financial Health
StableStable · Hiring · 7% CAGR over 4y
Location
Skanska UK
Provides construction and civil engineering services, including building development, infrastructure projects, and specialist ground engineering. Also delivers facilities management, mechanical and…
Serves public-sector bodies and large organisations in commercial property, healthcare, education, defence, local government, rail, highways, energy, data centres and infrastructure markets.
Location
Barking & Dagenham Trading Partnership Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides building repairs, maintenance and facilities management for housing, schools and commercial sites; delivers school and event catering and contract cleaning; and operates a business and…
Serves schools, housing providers, landlords, local authority bodies and businesses needing office, laboratory or facilities support, with emphasis on Barking and Dagenham community needs.
Financial Health
WeakWeak · Hiring · 16% CAGR over 2y
Location
Designs, deploys, and operates nationwide technology systems for governments, including national digital platforms and mission‑critical public infrastructure. Provides implementation, integration,…
Serves national governments and public-sector institutions responsible for nationwide, mission-critical technology programmes, especially where scale, fixed timelines, public trust and operational…
Location
KOSI LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides consulting and outsourced services to public sector organisations, including accountancy and audit, financial management and analysis, payroll and procurement support, IT and data analytics,…
Serves public sector organisations in the UK, Ireland and internationally, including government departments, local authorities, audit institutions, health bodies, courts, education agencies and…
Financial Health
StableStable
Location
THE UNILINK GROUP LIMITED
Trajectory
2y · 2020–NowFinancial sub-scores
Computed from 2 filingsDevelops software platforms for prisons and probation services, including offender case management, prisoner self-service systems, biometric identification, and secure communication tools that…
Serves public and private sector criminal justice organisations, including prisons, probation services, custodial facilities, community corrections providers and agencies managing offenders, inmates…
Financial Health
StableStable · Profitable · 0% CAGR over 1y
Location
CDW UK
Provides IT products and services including hardware, software, cloud platforms, networking, and cybersecurity solutions. Offers technology consulting, system integration, managed IT services, device…
Sells to organisations needing IT solutions and services, including public sector bodies, large enterprises, corporates and mid-market firms. Targets sectors such as central and regional government,…
Location
NATIONAL FRAMEWORK PARTNERSHIP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and manages public sector procurement frameworks and dynamic purchasing systems covering construction, legal, facilities management, recruitment, utilities, and consultancy services,…
Serves public sector buyers, particularly housing associations, local authorities and related bodies, alongside suppliers seeking access to public procurement opportunities across construction,…
Financial Health
StrongStrong · Growing, Hiring · 31% CAGR over 4y
Location
Highway Project Management Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides technology-enabled traffic management, parking enforcement, ANPR monitoring, air quality monitoring, road user charging administration, notice processing, and debt recovery services for…
Serves UK government bodies, local authorities, utilities and private sector organisations, including clients responsible for transport, parking, air quality, licensing, revenue protection, customer…
Financial Health
StrongStrong · Hiring · 5% CAGR over 4y
Location
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsDevelops digital software products and provides technology services for public sector organisations. Designs and builds tools such as case management and workflow systems, and supports departments…
Serves UK public sector organisations, including central government departments, local councils, police forces and public bodies, targeting teams responsible for digital service delivery and internal…
Financial Health
StableStable · 0% CAGR over 1y
Location
S.C.C. (Essissii) Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides managed IT services including digital workplace support, cloud and infrastructure management, networking, cybersecurity, software licensing, and IT asset management. Also offers consulting,…
Serves public sector organisations—central/local government, healthcare, education, defence and emergency services—and commercial enterprises in finance, legal, construction, utilities,…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
ACUITY APPLIED LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital consulting and development services for government organisations, including design and delivery of online public services, case management systems and funding platforms, as well as…
Targets UK public-sector buyers, particularly central government departments, civil service delivery teams, local councils, and organisations using Crown Commercial Service procurement frameworks.
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
Zaizi Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides digital transformation consultancy for government and public sector organisations, including strategy, service design, software engineering, cloud architecture, automation and AI…
Serves public sector organisations and government decision-makers, particularly teams in border security, national security and wider government departments or statutory bodies responsible for…
Financial Health
HealthyHealthy · Hiring · 20% CAGR over 4y
Location
MUTUAL VENTURES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy and delivery support to public sector organisations, including central and local government and the NHS, focusing on service transformation, children’s services, workforce and…
Serves public sector organisations, including local authorities, NHS bodies, central government teams, children’s services, public safety agencies, and organisations involved in work, health, skills…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
Ninesatigo Ltd
Trajectory
1y · 2025–NowProvides digital delivery services for the public sector through statement‑of‑work engagements, supplying consultants and cross‑functional teams to design, build and integrate digital services,…
Serves UK public sector organisations, including central and local government, NHS, police and defence bodies, and public finance institutions.
Financial Health
Insufficient historyInsufficient history
Location
TEXUNA TECHNOLOGIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops and delivers data management software and services including data warehousing, data registries, data collection systems, business intelligence analytics, and identity management, using cloud…
Serves public sector organisations and education bodies in the UK and Ireland, including government departments and agencies with enterprise data and digital service needs.
Financial Health
StableStable · 0% CAGR over 4y
Location
PROCUREPUBLIC LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides public sector procurement frameworks and dynamic purchasing systems for contracting authorities. Covers areas such as construction, building maintenance, consultancy, facilities management,…
Serves UK public sector contracting authorities, including councils, housing providers and other public bodies procuring construction, maintenance, compliance, facilities management and consultancy…
Financial Health
StrongStrong · Growing, Hiring · 27% CAGR over 5y
Location
31TEN CONSULTING LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides consulting services to public sector organisations, including local and central government and housing bodies, covering strategy and transformation, organisational design, digital and data,…
Serves public-sector organisations, including local and central government, housing and development bodies, blue light services, health and social care providers, children’s services, local…
Financial Health
StableStable · -87% CAGR over 2y
Location
WOODFORD INVESTMENTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides facilities management and building support services including cleaning, security guarding, engineering maintenance, energy management, waste management, landscaping, and workplace services.…
Serves large UK businesses and public sector bodies, including central and local government, defence, education, healthcare, financial services, manufacturing, retail, transport, utilities, telecoms,…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
Provides facilities management services including commercial cleaning and hygiene, security guarding, engineering maintenance, waste and environmental services, landscaping, and energy management.…
Serves large UK businesses and public sector organisations, including financial services, manufacturing, telecoms, pharmaceuticals, retail, transport, utilities, central/local government, defence,…
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides consultancy on organisational change and digital transformation for public sector bodies. Services include target operating model design, strategy development, service design, project and…
Serves public sector organisations across the UK and Ireland, especially local government, housing, transport and health bodies, targeting senior leaders and teams responsible for digital…
Financial Health
StableStable · Hiring · 16% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides implementation, configuration and support of the My Council Services cloud platform for local authorities, enabling digital service delivery including customer portals, web forms, CRM…
Serves UK and Ireland local government bodies, including borough, town, city and county councils, and teams responsible for customer services, licensing, waste, housing, highways, revenues and…
Financial Health
StableStable · -62% CAGR over 4y
Location
Tradecraft Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and builds digital products and online services for organisations delivering public services. Provides strategy, service design, software development, and managed web publishing and hosting,…
Serves public, third-sector and other organisations delivering citizen-focused services, especially teams in education, justice, housing, planning and central government digital functions.
Financial Health
StableStable · -27% CAGR over 4y
Location
TWENTY SEVEN CONSULTING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides workforce and organisational transformation consulting for public sector bodies, including operating model design, managed staffing services, supplier sourcing, end‑to‑end recruitment…
Serves public sector organisations, especially Civil Service and NHS teams, targeting leaders, HR functions and hiring managers responsible for transformation programmes, workforce structures and…
Financial Health
WeakWeak · -5% CAGR over 4y
Location
CPC Project Services
Provides project and cost management consultancy for construction and infrastructure projects. Services include programme and project management, cost consultancy, risk and schedule management,…
Serves B2B and public sector clients delivering capital projects, including transport and infrastructure operators, property developers, commercial organisations, utilities, energy and nuclear…
Location
SOFTWARE MARKET LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops business management software and IT services including finance and procurement systems, HR and payroll, governance and risk tools, and sector‑specific applications for education, healthcare,…
Serves B2B and public sector organisations, including education, government, healthcare, housing, legal, manufacturing, transport, retail, social care, wholesale and logistics, with buyers in…
Financial Health
StrongStrong
Location
Policy in Practice Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDevelops data analytics and software tools for public sector and social organisations, including benefits calculators, income tracking, and safeguarding data platforms. Also provides social policy…
Serves local authorities, housing providers, utilities, financial services firms, charities and public-sector policymakers, plus individuals seeking benefits support, focused on people facing…
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 4y
Location
Altair
Provides consultancy and advisory services to social housing and other socially focused organisations, including governance and regulation, corporate finance and treasury, development and…
Serves socially focused organisations, including housing providers, local authorities, charities, education bodies, and sport-sector organisations needing consultancy, advisory, recruitment,…
Location
Unlock all 1,800 leads
Showing 50 of 1,800 — +1,750 more with verified decision-maker contacts, live data, and CRM sync.
How London public sector companies work and how to sell to them
What they do
London suppliers in this segment earn revenue by turning public-body needs into contracted goods, services or delivery capacity. Commercial models range from fixed-price projects and consultancy day rates to managed-service retainers, facilities contracts, unit-priced equipment supply and subscription or licence fees for software. Smaller engagements are often call-offs, audits, interim support or discrete implementation work; larger ones look more like multi-year outsourcing or service-delivery contracts with mobilisation, performance reporting and change-control built in. Gross margin depends less on list price than on utilisation, bid cost, compliance overhead and the ability to absorb slower award cycles.
Who they sell to
Most sell into public bodies and public-adjacent organisations, including central departments, councils, NHS bodies, schools, universities, housing providers, transport operators and utilities. Budget holders are usually service directors, finance leads, estates managers, digital leaders or programme owners, with procurement shaping route-to-market and legal or information-governance teams testing contract risk. Low-value purchases may move through catalogues, framework call-offs or direct awards where permitted; material contracts usually require a notice, written questions, scored submissions, presentations and reference checks. Sales cycles tend to be measured in months, and renewals depend on operational evidence as much as account relationships.
What they buy
Public-sector suppliers tend to spend on systems that reduce the cost of bidding and delivery. Bid management, CRM, contract lifecycle management, pricing, finance, procurement and document-control tools are common needs, particularly where teams chase framework renewals or manage many call-offs. Delivery-heavy firms also need workforce scheduling, time recording, payroll, HR, training, health and safety, asset management, helpdesk and service-desk tooling. Technology suppliers add cloud infrastructure, testing, monitoring, cyber security and data-governance requirements. Professional-services spend often sits around legal review, accounting, insurance, recruitment, tender support, copywriting for submissions and sector-specific assurance evidence.
Why and how to sell to them
Buying interest tends to appear around framework wins, new tender notices, contract mobilisation, missed bids, leadership changes and headcount growth after a contract award. Pain points are usually practical: bid teams need reusable evidence, finance teams need margin control, delivery managers need live service reporting, and directors need assurance that payment terms, exclusions and subcontractor obligations will not derail an award. Outbound works better when it is tied to a public-sector trigger rather than a generic efficiency claim. Useful angles include reducing bid cost, shortening mobilisation, improving audit trails, protecting contract margin or giving managers evidence they can use in review meetings.
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.
Also in London
Related directories
Frequently asked questions
How many public sector companies are there in the London?↓
What counts as a public sector company in this list?↓
Which are the largest public sector companies in the London?↓
What do public sector companies in the London actually do?↓
How does London public sector compare internationally?↓
How is this list built and how fresh is the data?↓
How big are the typical public sector companies in the London?↓
Are these mostly new or established public sector companies?↓
What SIC codes does this use?↓
What buying signals should I look for?↓
Push these 1,800 companies into your pipeline.
Find the right decision-makers, see verified company data, and export your list in seconds.