# The 30 largest AI consultancies and service providers in London
Tamtam tracks 191 AI consultancies and service providers headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by Endava, Qualitest and Photon. Their median headcount is 806. Half of them were founded in 2008 or later.
These London-based companies specialize in AI consulting and services, primarily within the IT Services and IT Consulting industry. The list includes a mix of large established firms and more recently founded companies, indicating a dynamic sector in the city.
Notable companies include Qualitest, a global leader in AI-powered Quality Engineering services, and Photon, a digital agency working with Fortune 100 companies. QA Ltd provides continuous tech training programs focused on AI, while Faculty develops and implements safe AI systems. Accenture UK & Ireland is a global professional services company leveraging technology, and OLIVER | The Brandtech Group designs in-house agencies for brands.
π¬π§ London Β· 30 companies Β· Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Endava](https://www.tamtam.ai/c/endava) (endava.com)
The company leverages technology and expertise to drive innovation and transform businesses with customized digital solutions across industries | IT Services and IT Consulting | π¬π§ London | 9,559 | 2020 |
| 2 | [Qualitest](https://www.tamtam.ai/c/qualitest) (quality-ai.com)
Global leader in AI-powered Quality Engineering services, specializing in superior customer experience, accelerated release velocity, and tailored solutions for various industries | IT Services and IT Consulting | π¬π§ London | 6,088 | 1997 |
| 3 | [Photon](https://www.tamtam.ai/c/photon) (photon.com)
A leading digital agency working with Fortune 100 companies, integrating strategy consulting, creative design, and technology to drive digital initiatives at scale | IT Services and IT Consulting | π¬π§ London | 5,867 | 2007 |
| 4 | [Accenture UK & Ireland](https://www.tamtam.ai/c/accenture-uk-and-ireland) (accenture.com)
A global professional services company leveraging technology, innovation, and industry expertise to drive digital transformation and deliver tangible outcomes for clients worldwide | IT Services and IT Consulting | π¬π§ London | 4,101 | |
| 5 | [QA Ltd](https://www.tamtam.ai/c/qa-ltd) (qa.com)
Providing continuous, collaborative tech training programs focused on AI, cloud, and data skills to drive organizational transformation and growth. | Business Consulting and Services | π¬π§ London | 3,994 | 1985 |
| 6 | [OLIVER \| The Brandtech Group](https://www.tamtam.ai/c/oliver-the-brandtech-group) (oliverinside.ai)
Design and operate bespoke in-house agencies and ecosystems for brands, driving business growth and innovative marketing solutions globally. | Advertising Services | π¬π§ London | 3,870 | 2009 |
| 7 | [Abacus](https://www.tamtam.ai/c/abacus) (abacus-global.com)
Providing industry-focused, technology-driven business transformation solutions through consulting, systems integration, and outsourcing to help clients lead their industries. | IT Services and IT Consulting | π¬π§ London | 3,703 | 1987 |
| 8 | [Ciklum](https://www.tamtam.ai/c/ciklum) (ciklum.com)
Global digital solutions company providing tailored solutions for Fortune 500 and fast-growing organizations worldwide, leveraging emerging technologies for various clients | IT Services and IT Consulting | π¬π§ London | 2,972 | 2002 |
| 9 | [Equal Experts](https://www.tamtam.ai/c/equal-experts) (equalexperts.com)
A global team of experienced consultants who help create leading digital products and services, focusing on data-driven decisions, user-centric design, and sustainable scaling | IT Services and IT Consulting | π¬π§ London | 1,491 | 2007 |
| 10 | [K2 Partnering Solutions](https://www.tamtam.ai/c/k2-partnering-solutions) (k2partnering.com)
Providing consulting, recruitment, training, and platform solutions to support companies in enterprise applications, AI, and cloud technology projects. | IT Services and IT Consulting | π¬π§ London | 1,383 | 1997 |
| 11 | [Merit Data & Technology India](https://www.tamtam.ai/c/merit-data-and-technology-india) (meritdata-tech.com)
A company that provides marketing data, product data, customized software, and marketing automation to help B2B brands embrace the challenges of the future | Information Services | π¬π§ London | 1,128 | 2004 |
| 12 | [Faculty](https://www.tamtam.ai/c/faculty) (faculty.ai)
The company develops and implements safe AI systems integrating human and artificial intelligence for optimized performance | Technology, Information and Internet | π¬π§ London | 1,073 | 2014 |
| 13 | [Kubrick Group](https://www.tamtam.ai/c/kubrick-group) (kubrickgroup.com)
Deliver data and AI solutions reducing costs, enhancing risk resilience, uncovering revenue, and training diverse specialists for technology partnerships. | IT Services and IT Consulting | π¬π§ London | 942 | 2016 |
| 14 | [Elixirr](https://www.tamtam.ai/c/elixirr) (elixirr.com)
A global consulting firm with diverse expertise in business challenges, innovation, and change management, driven by entrepreneurial spirit and ownership mindset | Business Consulting and Services | π¬π§ London | 902 | 2009 |
| 15 | [VML Enterprise Solutions](https://www.tamtam.ai/c/vml-enterprise-solutions) (vml.com)
Global company offering end-to-end solutions for retailers and brands to drive transactions and customer loyalty through commerce, technology, data, and experience | IT Services and IT Consulting | π¬π§ London | 806 | 2019 |
| 16 | [Beyond](https://www.tamtam.ai/c/beyond) (bynd.com)
A design agency focused on enhancing customer experiences through strategy, technology, and design, serving diverse clients globally with a remote-first workforce | IT Services and IT Consulting | π¬π§ London | 752 | 2010 |
| 17 | [Sabio](https://www.tamtam.ai/c/sabio) (bit.ly)
Global CX transformation specialist using cloud migration, CX technologies, and customer insights to optimize customer journeys for major brands worldwide | IT Services and IT Consulting | π¬π§ London | 718 | 1998 |
| 18 | [JMAN Group](https://www.tamtam.ai/c/jman-group) (jmangroup.com)
Specializes in maximizing value creation activities for private equity funds and their portfolio companies, addressing investment decisions and value creation initiatives with real-time data. | Business Consulting and Services | π¬π§ London | 686 | 2010 |
| 19 | [Toppan Digital Language](https://www.tamtam.ai/c/toppan-digital-language) (toppandigital.com)
Toppan Digital Language provides innovative language solutions for high-risk content, serving top companies globally with specialized teams and cutting-edge technology | Translation and Localization | π¬π§ London | 661 | |
| 20 | [Roboyo](https://www.tamtam.ai/c/roboyo) (roboyo.global)
Leading provider of AI-powered automation solutions. Helps organizations embed intelligence into their business, aligning people, processes, and technology for measurable outcomes and growth. | IT Services and IT Consulting | π¬π§ London | 614 | 2015 |
| 21 | [Sparta Global](https://www.tamtam.ai/c/sparta-global) (linktr.ee)
Partners with organizations to build technology, change, data, and AI capability, providing AI native consultants, upskilling programs, and expert support for AI oversight and transformation. | IT Services and IT Consulting | π¬π§ London | 583 | 2014 |
| 22 | [TelefΓ³nica Tech (EN)](https://www.tamtam.ai/c/telefonica-tech-en) (telefonicatech.uk)
Specialist provider of integrated technology solutions including cybersecurity, cloud, data, AI, business applications, and digital workplace services. | IT Services and IT Consulting | π¬π§ London | 557 | |
| 23 | [Zenitech](https://www.tamtam.ai/c/zenitech) (zenitech.co.uk)
Zenitech partners with clients to create and implement innovative technologies that drive business growth, improve customer experience, and accelerate time to market | IT Services and IT Consulting | π¬π§ London | 551 | 2015 |
| 24 | [SPD Technology](https://www.tamtam.ai/c/spd-technology) (spd.tech)
Custom software development & IT consulting Expertise in Fintech, E-commerce, Telecom, and more Award-winning solutions for big brands and startups worldwide | IT Services and IT Consulting | π¬π§ London | 530 | 2006 |
| 25 | [Kovaion Consulting](https://www.tamtam.ai/c/kovaion-consulting) (kovaion.com)
Provides Agile, Intelligent, Personalized Solutions & Services, specializing in PeopleSoft, Oracle HCM/ERP Cloud, Taleo, Application Development and KovaionAI Agents. | IT Services and IT Consulting | π¬π§ London | 500 | 2010 |
| 26 | [Scale Factory (formerly Ten10)](https://www.tamtam.ai/c/scale-factory-formerly-ten10) (ten10.com)
The company provides diverse tech talent through their Tech Academy and offers cutting-edge technology consultancy for tailored solutions and services | IT Services and IT Consulting | π¬π§ London | 468 | 2008 |
| 27 | [Hitachi Solutions UK](https://www.tamtam.ai/c/hitachi-solutions-uk) (hitachi-solutions.co.uk)
Provides business-tailored services and solutions for transformation journeys, including finance, low code, AI, and data-based transformation, offering advisory and application support. | IT Services and IT Consulting | π¬π§ London | 462 | 2012 |
| 28 | [Acuvate](https://www.tamtam.ai/c/acuvate) (acuvate.com)
Empowers enterprises to accelerate next-gen transformation journeys using an AI-first approach, modernizing, automating, and transforming applications for agility in the digital world. | Software Development | π¬π§ London | 444 | 2006 |
| 29 | [Softwire](https://www.tamtam.ai/c/softwire) (softwire.com)
Help organizations use technology to deliver meaningful outcomes and positive impact, solving problems and anticipating future challenges with bespoke solutions in regulated verticals. | IT Services and IT Consulting | π¬π§ London | 426 | 2000 |
| 30 | [ZONE3000](https://www.tamtam.ai/c/zone3000) (zone3000.com)
A leading IT employer in Ukraine with over 20 years of experience in software development, technical support, and long-term partnerships | IT Services and IT Consulting | π¬π§ London | 413 | 1998 |
## How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.
## More company lists in London
- [The largest companies in London](https://www.tamtam.ai/l/largest-companies-london) (12,882)
- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
- [Financial Services companies in London](https://www.tamtam.ai/l/financial-services-companies-london) (1,862)
- [Financial services firms in London](https://www.tamtam.ai/l/financial-services-firms-london) (1,824)
- [SaaS companies in London](https://www.tamtam.ai/l/saas-companies-london) (1,615)
- [Professional services firms in London](https://www.tamtam.ai/l/professional-services-firms-london) (1,248)
- [Software Development companies in London](https://www.tamtam.ai/l/software-development-companies-london) (1,217)
- [Retail chains in London](https://www.tamtam.ai/l/retail-chains-london) (942)
- [IT Services and IT Consulting companies in London](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-london) (693)
- [Companies with a mobile app in London](https://www.tamtam.ai/l/companies-with-mobile-app-london) (667)
- [Consulting firms in London](https://www.tamtam.ai/l/consulting-firms-london) (648)
- [IT services companies in London](https://www.tamtam.ai/l/it-services-companies-london) (607)
- [Subscription businesses in London](https://www.tamtam.ai/l/subscription-businesses-london) (544)
- [Venture capital and private equity firms in London](https://www.tamtam.ai/l/vc-and-private-equity-firms-london) (539)
- [Marketing and communications agencies in London](https://www.tamtam.ai/l/marketing-agencies-london) (533)
- [Retail Apparel and Fashion companies in London](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-london) (498)
- [Advertising Services companies in London](https://www.tamtam.ai/l/advertising-services-companies-london) (480)
- [Companies with in-house R&D in London](https://www.tamtam.ai/l/r-and-d-companies-london) (477)
- [AI companies in London](https://www.tamtam.ai/l/ai-companies-london) (456)
- [Investment Management companies in London](https://www.tamtam.ai/l/investment-management-companies-london) (452)
- [Hotel and hospitality groups in London](https://www.tamtam.ai/l/hospitality-groups-london) (445)
- [Luxury brands in London](https://www.tamtam.ai/l/luxury-brands-london) (428)
- [AI-native companies in London](https://www.tamtam.ai/l/ai-native-companies-london) (407)
- [E-commerce companies in London](https://www.tamtam.ai/l/ecommerce-companies-london) (384)
## The same list elsewhere in United Kingdom
- [AI consultancies and service providers in the United Kingdom](https://www.tamtam.ai/l/ai-service-providers-united-kingdom) (284)
## The same list elsewhere
- [AI consultancies and service providers in the world](https://www.tamtam.ai/l/ai-service-providers-in-the-world) (3,241)
- [AI consultancies and service providers in Europe](https://www.tamtam.ai/l/ai-service-providers-in-europe) (1,725)
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Source: https://www.tamtam.ai/l/ai-service-providers-london