IT Consulting Companies in London: 3,329 Active Firms (2026)
IT consulting companies advise on, implement and support business technology systems for organisations based in and around London.
Buying centres tend to sit with technology executives, finance, operations, security and procurement teams, depending on whether the work is strategy, systems integration, cloud infrastructure, data platforms, cybersecurity or enterprise applications. Most sales motions are business-to-business, but London consultancies also serve public-sector bodies where procurement and delivery assurance matter. The typical buyer is mid-market or enterprise rather than consumer-facing; engagements are usually scoped as discovery phases, platform migrations, integration programmes or managed-support retainers, with contract shape driven by risk, uptime and internal delivery capacity.
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London has 3,329 actively trading IT consulting companies, a broad local market that is still skewed towards small service businesses rather than revenue-scale advisory groups. The reported employment footprint is 1,695 people among companies with published headcount, so the sector is not confined to contractor-led practices. A small revenue-scale layer is visible: 37 consultancies sit above £5M turnover, while 1,095 incorporations since 2022 point to frequent new practice formation and a thinner upper-middle tier.
Client-side control shapes the market more than sector-specific licensing. London buyers often ask consultancies to evidence security governance, data-handling process, subcontractor oversight and professional indemnity before access to production systems. Public-sector work adds procurement scoring, audit trails and delivery-accountability terms, while private-sector projects tend to be framed around risk reduction, systems availability and migration control. Credentials, framework access and referenceable delivery categories therefore matter, even when the underlying activity is advisory rather than a regulated financial or clinical service.
Demand appears to be moving towards narrower capability sets: cloud migration, security remediation, data engineering, application modernisation and support for operational change. Buyers tend to favour firms that can show delivery governance and stay close to existing systems, rather than consultancies selling generic transformation language. Consolidation has been a plausible route for providers that need sector expertise, public-sector access or scarce engineering capacity, while smaller practices remain exposed to pauses in discretionary project work. The London market therefore appears to reward specialisation and delivery proof more than headcount scale alone.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
3,329
Active firms
2026
37
Above £5M
reported turnover
1,095
Since 2022
incorporated firms
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Key facts
About 1% of the trading cohort reports turnover above £5M (37 of 3,329 firms) — the rest sits below that revenue band.
32% of the cohort was incorporated since 2022 (1,095 firms), so a sizeable share is in its first few filing cycles.
London concentrates a large share of UK corporate technology buying, supporting demand for systems change, managed support and project delivery.
Typical buyers include finance, public-sector, professional-services and mid-market organisations based in and around the capital.
IT consulting work usually sits around advising on, implementing and supporting business technology systems.
The segment spans delivery-heavy consultancies alongside leaner advisory and contracting businesses.
Top London IT Consulting companies
Financial sub-scores
Computed from 5 filingsProvides IT consultancy and technology services including Microsoft 365, cloud, security and communications systems. Supplies hardware, networking and managed IT infrastructure, and offers healthcare…
Serves public and private sector organisations, including healthcare providers, government bodies and corporate clients, that need external ICT, technology and consulting support across the UK,…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Provides IT managed services and technology consultancy for businesses, including cloud infrastructure, networking, cyber security, data and AI solutions, workplace collaboration tools, and contact…
Serves SMEs, large enterprises and public sector bodies, including central and local government, financial services, legal, nonprofit, retail, transport, hospitality, BPO/outsourcing and professional…
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Computed from 3 filingsProvides consulting, implementation and managed services for Microsoft business applications. Specialises in Dynamics 365 ERP and CRM systems and the Microsoft Power Platform, supporting…
Serves mid-market and enterprise businesses, particularly finance, procurement, operations and customer service leaders in sectors such as retail, manufacturing, field service and waste management.
Financial Health
StrongStrong · Growing, Hiring · 91% CAGR over 2y
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Computed from 5 filingsProvides digital transformation consulting and technology services, including strategy development, programme and project delivery, organisational and workforce transformation, enterprise…
Serves SMEs and enterprise organisations across healthcare, government and public sector, professional services, TMT, financial services, energy and resources, consumer markets, transport and defence…
Financial Health
StableStable · -20% CAGR over 4y
Location
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Provides IT consulting and implementation services focused on enterprise software and digital transformation, including SAP and Microsoft platforms, ERP systems, data analytics, cloud solutions,…
Serves mid-market and enterprise organisations, including public sector bodies, across industries such as manufacturing, healthcare, financial services, retail, construction, utilities, travel, and…
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Computed from 5 filingsProvides digital transformation consulting and technology services including digital strategy, change management, application development, cloud infrastructure, data and AI solutions, Microsoft 365…
Serves organisations across sectors, including public sector councils and private-sector enterprises, with buyers such as IT, CRM, learning, performance insight and solution architecture teams.
Financial Health
HealthyHealthy · Hiring · 19% CAGR over 4y
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Computed from 5 filingsProvides technology and digital transformation consultancy including software engineering, cloud and DevOps platform development, data and AI services, testing, product delivery, and architecture…
Serves UK government, public sector bodies and critical enterprise organisations, including energy and utilities, telecommunications, healthcare, financial services and defence buyers undertaking…
Financial Health
HealthyHealthy · -56% CAGR over 5y
Location
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Computed from 5 filingsProvides business and technology consulting services including digital transformation, systems integration, data analytics, and cloud engineering. Supports implementation and optimisation of…
Serves enterprise businesses in customer-centric sectors, including retail and specialty brands, logistics and transport, FMCG, financial services and fintech, hospitality, travel, leisure, media and…
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides consulting services for digital transformation programmes, including ERP and CRM implementation, enterprise platform optimisation, cybersecurity and cloud adoption. Supports planning,…
Serves large enterprises and public sector organisations, targeting CPG and retail brands, media and advertising firms, financial institutions, insurers, life sciences companies, and healthcare…
Financial Health
HealthyHealthy · -53% CAGR over 5y
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Computed from 5 filingsProvides IT consulting and digital transformation services, including cloud and data centre migration, intelligent automation, digital workplace implementation, and Adobe Workfront solutions.…
Targets enterprise clients and agencies, especially in media and publishing, finance and insurance, energy and utilities, telecommunications, manufacturing, and transportation.
Financial Health
StrongStrong
Location
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Computed from 5 filingsProvides technology consulting and software engineering services including AI, cloud and DevOps, cybersecurity, data engineering and digital transformation. Develops and implements platforms such as…
Serves large enterprises and public-sector organisations, especially financial services institutions across capital markets, banking, payments, wealth and asset management, plus insurance, high tech,…
Financial Health
StrongStrong · Growing, Hiring · 90% CAGR over 4y
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Computed from 5 filingsProvides IT and digital transformation consultancy, including service architecture and design, project, programme and portfolio management, cloud and data centre migrations, SaaS adoption, data and…
Serves public-sector bodies and enterprise organisations in defence and security, utilities, telecoms and finance, targeting leaders responsible for complex IT service transformation and delivery.
Financial Health
HealthyHealthy
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Computed from 5 filingsProvides digital transformation and technology consulting services, including strategy, cyber security, software engineering, data and AI, and product development. Works with government, defence and…
Serves UK government and defence organisations, plus public sector, healthcare, aerospace, financial services, energy, consumer, telecoms and media enterprises seeking digital transformation and…
Financial Health
StrongStrong · Growing, Hiring · 120% CAGR over 4y
Location
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Computed from 5 filingsProvides IT consulting and project management services for organisations, including IT strategy, digital transformation, cloud computing, cybersecurity, M&A technology integration, IT service…
Serves large multinational businesses and recognised brands with complex technology environments, especially in life sciences, financial services, retail, energy and resources, and manufacturing,…
Financial Health
StableStable · Hiring · 5% CAGR over 3y
Location
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Computed from 3 filingsProvides business and technology consulting services including strategy advisory, data and AI solutions, cybersecurity, and operational outsourcing. Supports digital transformation and process…
Serves B2B clients including banks, insurers, financial institutions, real estate firms, industrial companies and large corporates seeking consultancy, technology, data and operations support.
Financial Health
StableStable · Hiring · 37% CAGR over 2y
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Computed from 5 filingsProvides IT consulting and technology services including IT strategy and planning, digital transformation projects, SAP S/4HANA ERP implementation, contract staffing for consulting roles, and…
Serves B2B organisations of all sizes, including medium and large businesses using ERP systems, across healthcare, finance, manufacturing, retail and telecommunications. Targets business leaders…
Financial Health
StableStable
Location
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Computed from 5 filingsProvides IT consulting, digital engineering and software development services. Implements and integrates enterprise platforms such as Salesforce, SAP and Microsoft, and develops AI, data analytics…
Serves enterprise and mid-market organizations in beverage, manufacturing, CPG, healthcare and life sciences, software, insurance, and public sector/nonprofits, typically teams using Salesforce,…
Financial Health
HealthyHealthy · Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides engineering and IT consulting services, including embedded software development for automotive systems, data and AI solutions, cybersecurity, cloud and DevOps, software and mobile…
Serves enterprise and mid-market B2B clients in automotive, energy and manufacturing, plus organisations undertaking digital transformation across data, cybersecurity, cloud, software development and…
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
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Computed from 3 filingsProvides IT and technology consultancy services including strategy and business case development, procurement support, project implementation, cyber security consulting, and business continuity…
Serves public, private and third-sector organisations, including higher and further education, healthcare, government bodies, charities and enterprise IT teams.
Financial Health
HealthyHealthy · Profitable, Hiring · 6% CAGR over 2y
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Computed from 4 filingsProvides digital engineering and IT consulting services including intelligent automation, robotic process automation, quality engineering, and data engineering and analytics. Implements CRM,…
Sells to enterprise organisations in insurance, banking and finance, non-profit, and e-commerce/retail, targeting business and technology leaders responsible for digital operations and transformation.
Financial Health
StrongStrong · Hiring · 14% CAGR over 3y
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Computed from 5 filingsProvides technology and cloud consulting services including IT infrastructure consulting, cloud strategy and SaaS implementation, digital and customer experience solutions, automation, cybersecurity,…
Serves businesses and startups seeking digital, technology, transformation and cloud support, including organisations focused on customer experience, infrastructure, automation, cybersecurity and…
Financial Health
WeakWeak · 0% CAGR over 4y
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Computed from 4 filingsProvides IT consultancy and technology services including software development, enterprise application implementation, analytics and insights, digital engineering, infrastructure management, and IT…
Sells to businesses, particularly startups, SMEs and larger enterprises seeking IT consultancy, software, analytics, infrastructure and staffing support. Targets organisations undergoing digital…
Financial Health
WeakWeak · Hiring · 26% CAGR over 3y
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Computed from 2 filingsProvides IT consulting and technology services including digital transformation planning, cloud strategy and migration, data analytics, cybersecurity consulting, IT infrastructure and software…
Serves businesses and organisations seeking IT strategy, digital transformation, cloud, data analytics, cybersecurity and training support, targeting decision-makers needing tailored technology and…
Financial Health
StableStable · -43% CAGR over 1y
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Computed from 5 filingsProvides management consultancy and IT services focused on digital, data and technology transformation. Supports organisations with programme delivery, system replatforming, cloud procurement, and…
Serves public sector bodies, government departments, education organisations and large businesses running complex digital, data, technology and transformation programmes.
Financial Health
StrongStrong · Growing, Hiring · 67% CAGR over 5y
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Computed from 5 filingsProvides digital transformation consultancy services to governments, public sector bodies, charities and commercial organisations, including digital strategy, service design, data strategy,…
Serves large commercial organisations, governments and global institutions, including public sector bodies, local authorities, charities, health and care providers, universities, financial services…
Financial Health
StrongStrong · Growing, Hiring · 43% CAGR over 4y
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Computed from 5 filingsProvides information technology consulting services including cloud adoption, digital transformation strategy, project management, DevOps, and enterprise application implementation. Advises…
Serves enterprises and public-sector organisations needing IT and digital transformation support, with stated sectors including healthcare, utilities, telecommunications, retail, e-commerce, finance…
Financial Health
StableStable · Hiring · 26% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy covering digital transformation, enterprise architecture, cloud readiness and security. Supplies project and programme management, PMO services, tender management, and…
Serves B2B organisations, including IT service providers, technology resellers and enterprises needing flexible senior resources for transformation, security, architecture and PMO/project delivery.
Financial Health
StrongStrong · Hiring · 5% CAGR over 4y
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Computed from 3 filingsProvides business and technology consulting services, including strategy advisory, AI and data management, digital transformation, and change management. Works with financial services firms,…
Serves banks and capital markets firms, wealth and asset managers, insurers, central and local government bodies, large and medium corporates, and start-ups/fintechs needing business, data and…
Financial Health
DistressedDistressed · -7% CAGR over 2y
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Computed from 5 filingsProvides consulting services to asset management, wealth management and insurance firms, including technology and business transformation advisory, system implementation, platform upgrades, data…
Serves buy-side financial services firms, including asset managers, wealth managers and insurance companies, typically teams leading technology, data, migration, upgrade and business transformation…
Financial Health
StrongStrong · Growing, Hiring · 93% CAGR over 4y
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Computed from 5 filingsProvides technology consulting focused on data and digital integration for banking and insurance organisations. Designs data architectures, develops distributed systems, and implements data strategy,…
Serves large enterprises and public-sector institutions in banking, insurance and other regulated markets, targeting data, architecture, payments, AI and transformation leaders.
Financial Health
StrongStrong · Hiring · 27% CAGR over 5y
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Computed from 5 filingsProvides IT consulting and technology services including SAP implementation and HANA migration, custom web and mobile software development, AI and machine learning solutions, cloud and CRM systems,…
Serves B2B organisations with enterprise technology needs, including SAP and non-SAP users, e-commerce firms, corporate website owners, and companies in retail and other industry verticals.
Financial Health
HealthyHealthy · -8% CAGR over 4y
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Computed from 5 filingsProvides management and technology consulting services, helping organisations develop strategy, design products and services, implement digital, data and AI capabilities, improve organisational…
Serves senior leaders in large private and public sector organisations across consumer and manufacturing, defence, energy, financial services, government, health, life sciences and transport.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides IT consulting and digital transformation services, including business analysis, business intelligence, enterprise software solutions, cloud computing, artificial intelligence and machine…
Sells to businesses seeking digital transformation and IT consulting, particularly in automotive, IT services, communications, consumer packaged goods, education, financial services and industrial…
Financial Health
StableStable · Hiring · 97% CAGR over 4y
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Computed from 4 filingsProvides business and IT consultancy services including strategic planning, digital transformation planning, cybersecurity governance, technology roadmapping, system integration, and server…
Sells to businesses seeking business and IT consultancy, including buyers responsible for strategy, transformation, cybersecurity, governance and technology planning. Targets organisations needing…
Financial Health
StrongStrong
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Computed from 5 filingsProvides software consultancy services focused on cloud, data and platform engineering. Advises on architecture, builds data‑driven systems and cloud‑native platforms, and develops tools and…
Serves B2B organisations from startups to large enterprises, particularly engineering, data and technology leaders with complex cloud, platform and data initiatives across varied industries.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
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Computed from 5 filingsProvides strategy and technology consulting focused on digital transformation. Supports organisations with problem analysis, service design, product development and implementation, including cloud,…
Serves private and public sector organisations, targeting C-suite leaders and business owners in transport, automotive, banking and other industries undergoing digital transformation.
Financial Health
WeakWeak
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Computed from 3 filingsProvides software development and IT consulting services, including application development, cloud migration, data analytics, AI and machine learning, automation, infrastructure management, and…
Serves large enterprises and Fortune 500 clients across banking and financial services, telecoms, healthcare and life sciences, manufacturing, energy and commodities, and retail.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
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Computed from 5 filingsProvides IT consulting and enterprise architecture services, including digital transformation support, cloud‑native application and data and AI solutions, architecture‑as‑a‑service, and specialist…
Serves businesses globally that need enterprise architecture, digital transformation, data and AI, cloud-native application support, or IT staff augmentation, typically organisations running complex…
Financial Health
WeakWeak
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Computed from 5 filingsProvides IT and business consulting services, including strategic advice, solution architecture, system implementation and technical support. Works with organisations to improve or replace existing…
Serves businesses of varying sizes needing business and IT consulting, with content addressing utilities and financial institutions such as banks involved in asset tracking, wayleave management and…
Financial Health
StrongStrong · -2% CAGR over 4y
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Computed from 5 filingsProvides data and analytics consultancy services including enterprise performance management, business intelligence, data integration and governance, and intelligent automation. Delivers advisory,…
Serves B2B and public-sector organisations, especially finance and data teams in housebuilding and construction, financial services, retail, manufacturing, higher education and housing associations.
Financial Health
StrongStrong · Growing, Hiring · 2% CAGR over 4y
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Computed from 5 filingsProvides technology consulting and implementation services for private capital market firms, including CRM and deal pipeline systems, investor portals, fund accounting and portfolio management…
Serves private capital markets firms, including private equity, private credit, real estate, infrastructure, fund-of-funds and secondaries managers, across the UK, EMEA, North America, the Middle…
Financial Health
WeakWeak · -65% CAGR over 4y
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Computed from 5 filingsProvides IT consultancy on digital transformation for organisations. Advises on operating model change, cloud migration, service design and change management, supporting government and private sector…
Serves IT services organisations within central government agencies and private sector organisations, typically senior technology and transformation leaders responsible for large-scale digital change…
Financial Health
StrongStrong · Hiring · 60% CAGR over 4y
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Computed from 5 filingsProvides technology consulting services including evaluating and selecting technology platforms, migrating and enhancing legacy systems, supporting product and service development, augmenting project…
Serves B2B organisations and delivery teams seeking technology, project management and subject-matter expertise, including companies building new products, migrating legacy systems, scaling delivery…
Financial Health
StrongStrong · 41% CAGR over 2y
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Computed from 5 filingsProvides consulting and delivery services to financial services firms, supporting strategic change and programme management, regulatory risk and compliance frameworks, digital transformation, data…
Serves financial services companies and their leadership teams worldwide, including organisations needing support with change, transformation, regulatory, risk, compliance, digital, data, AI, quality…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
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Computed from 5 filingsProvides technology and management consulting services, including IT consultancy, infrastructure and application design, and web application development. Develops software products for incident…
Serves businesses and organisations with IT, operations and governance teams seeking support around digital transformation, application development, infrastructure, audits, compliance, incident…
Financial Health
HealthyHealthy · Hiring · 128% CAGR over 4y
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Computed from 5 filingsProvides data management and business intelligence consulting, including enterprise data warehousing, analytics, data integration and migration, data governance and quality, and enterprise…
Serves large enterprises, especially financial services firms and FTSE 100 organisations, with buyers in data, analytics, risk, compliance, architecture and project delivery teams across EMEA, Asia…
Financial Health
WeakWeak · -73% CAGR over 4y
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Provides management consulting focused on business transformation, data and systems modernisation, technology consulting, and workforce and organisational change. Offers services such as portfolio…
Sells to large organisations and public sector bodies undergoing change programmes, especially business leaders and C-suite buyers in energy, financial services, healthcare, hospitality, life…
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Provides management and technology consulting focused on organisational operating models, digital service delivery and IT service management. Advises organisations on strategy, workflow design, tool…
Serves large private and public sector organisations across legal, healthcare, energy, defence, engineering, higher education and financial services, including teams responsible for strategy, digital…
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Computed from 3 filingsProvides consulting and technology services for finance departments, including digital finance strategy, enterprise performance management, system implementation, data integration, automation,…
Serves B2B organisations, particularly CFOs, finance teams, controllers and finance systems leaders in mid-market and enterprise companies seeking finance transformation and performance management…
Financial Health
DistressedDistressed · -90% CAGR over 2y
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Computed from 5 filingsProvides financial technology consultancy services to investment managers, institutional investors, and software vendors, including advisory, systems implementation, data management, operational…
Serves B2B clients in investment management, including institutional investors, asset managers, pension funds, financial software vendors and service providers operating locally and globally.
Financial Health
WeakWeak · -72% CAGR over 4y
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How London IT Consulting companies work and how to sell to them
What they do
IT consulting firms usually earn revenue through project fees, time-and-materials delivery, advisory retainers and managed-service contracts. Work is sold as capacity and accountability rather than a physical product: discovery workshops, architecture design, system integration, migration delivery, testing, security remediation and ongoing support. Pricing often reflects seniority mix, delivery risk and whether the consultancy owns an outcome or supplies named specialists into a client team. Fixed-scope work suits assessments and smaller implementation phases, while larger programmes tend to move through staged statements of work, change-control processes and recurring service charges once the system is live.
Who they sell to
Most London IT consultancies sell to mid-market and enterprise buyers with internal technology estates that are too complex for self-serve purchasing. Typical stakeholders include technology executives, finance leads, operations directors, security teams and procurement managers, with public-sector buyers adding formal tendering and delivery-assurance requirements. Sales cycles tend to be consultative rather than transactional: a referral or outbound conversation may lead to a short diagnostic phase, followed by a proposal, procurement review and statement of work. Partner-led routes also matter where consultancies implement or support third-party enterprise applications, but control usually remains with the end client.
What they buy
Most IT consulting firms tend to spend on tools and services that improve delivery utilisation, project governance and client assurance. Common categories include CRM, proposal management, professional-services automation, time recording, resource planning, billing, contract management, finance systems and recruitment support. Technical teams also buy cloud infrastructure, testing environments, security tooling, observability, code management, analytics and documentation systems, though many choices are constrained by client architecture and security policy. As people businesses, consultancies also need payroll, HR, learning, compliance, insurance, legal advice and marketing support aimed at proving sector expertise rather than broad brand awareness.
Why and how to sell to them
IT consulting buyers tend to evaluate vendors when utilisation becomes harder to manage, delivery teams grow faster than back-office process, or client assurance requirements start slowing bids. Other triggers include new public-sector procurement activity, a move into managed services, a senior hire in delivery or operations, or a shift from contractor-style projects to repeatable service lines. Outbound tends to work best when it speaks to margin leakage, bid conversion, delivery risk, security evidence or consultant productivity. Generic change language is weaker than a claim tied to a specific operating problem inside consulting 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.
Also in London
Related directories
Frequently asked questions
How many IT consulting companies are there in London?
What counts as a IT consulting company in this list?
Which are the largest IT consulting companies in London?
What do IT consulting companies in London actually do?
How does London IT consulting compare internationally?
How is this list built and how fresh is the data?
How big are the typical IT consulting companies in London?
Are these mostly new or established IT consulting companies?
What SIC codes does this use?
What buying signals should I look for?
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