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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Endavaendava.com
The company leverages technology and expertise to drive innovation and transform businesses with customized digital solutions across industries |
9,559 | |||
| 2 |
Qualitestquality-ai.com
Global leader in AI-powered Quality Engineering services, specializing in superior customer experience, accelerated release velocity, and tailored solutions for various industries |
6,088 | |||
| 3 |
Photonphoton.com
A leading digital agency working with Fortune 100 companies, integrating strategy consulting, creative design, and technology to drive digital initiatives at scale |
5,867 | |||
| 4 |
Accenture UK & Irelandaccenture.com
A global professional services company leveraging technology, innovation, and industry expertise to drive digital transformation and deliver tangible outcomes for clients worldwide |
4,101 | |||
| 5 | 3,994 | ||||
| 6 |
OLIVER | The Brandtech Groupoliverinside.ai
Design and operate bespoke in-house agencies and ecosystems for brands, driving business growth and innovative marketing solutions globally. |
3,870 | |||
| 7 |
Abacusabacus-global.com
Providing industry-focused, technology-driven business transformation solutions through consulting, systems integration, and outsourcing to help clients lead their industries. |
3,703 | |||
| 8 |
Ciklumciklum.com
Global digital solutions company providing tailored solutions for Fortune 500 and fast-growing organizations worldwide, leveraging emerging technologies for various clients |
2,972 | |||
| 9 |
Equal Expertsequalexperts.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 |
1,491 | |||
| 10 |
K2 Partnering Solutionsk2partnering.com
Providing consulting, recruitment, training, and platform solutions to support companies in enterprise applications, AI, and cloud technology projects. |
1,383 | |||
| 11 |
Merit Data & Technology Indiameritdata-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 |
1,128 | |||
| 12 |
Facultyfaculty.ai
The company develops and implements safe AI systems integrating human and artificial intelligence for optimized performance |
1,073 | |||
| 13 |
Kubrick Groupkubrickgroup.com
Deliver data and AI solutions reducing costs, enhancing risk resilience, uncovering revenue, and training diverse specialists for technology partnerships. |
942 | |||
| 14 |
Elixirrelixirr.com
A global consulting firm with diverse expertise in business challenges, innovation, and change management, driven by entrepreneurial spirit and ownership mindset |
902 | |||
| 15 |
VML Enterprise Solutionsvml.com
Global company offering end-to-end solutions for retailers and brands to drive transactions and customer loyalty through commerce, technology, data, and experience |
806 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 | 752 | ||||
| 17 | 718 | ||||
| 18 |
JMAN Groupjmangroup.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. |
686 | |||
| 19 |
Toppan Digital Languagetoppandigital.com
Toppan Digital Language provides innovative language solutions for high-risk content, serving top companies globally with specialized teams and cutting-edge technology |
661 | |||
| 20 |
Roboyoroboyo.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. |
614 | |||
| 21 |
Sparta Globallinktr.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. |
583 | |||
| 22 |
Telef贸nica Tech (EN)telefonicatech.uk
Specialist provider of integrated technology solutions including cybersecurity, cloud, data, AI, business applications, and digital workplace services. |
557 | |||
| 23 |
Zenitechzenitech.co.uk
Zenitech partners with clients to create and implement innovative technologies that drive business growth, improve customer experience, and accelerate time to market |
551 | |||
| 24 |
SPD Technologyspd.tech
Custom software development & IT consulting Expertise in Fintech, E-commerce, Telecom, and more Award-winning solutions for big brands and startups worldwide |
530 | |||
| 25 |
Kovaion Consultingkovaion.com
Provides Agile, Intelligent, Personalized Solutions & Services, specializing in PeopleSoft, Oracle HCM/ERP Cloud, Taleo, Application Development and KovaionAI Agents. |
500 | |||
| 26 |
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 |
468 | |||
| 27 |
Hitachi Solutions UKhitachi-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. |
462 | |||
| 28 |
Acuvateacuvate.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. |
444 | |||
| 29 |
Softwiresoftwire.com
Help organizations use technology to deliver meaningful outcomes and positive impact, solving problems and anticipating future challenges with bespoke solutions in regulated verticals. |
426 | |||
| 30 |
ZONE3000zone3000.com
A leading IT employer in Ukraine with over 20 years of experience in software development, technical support, and long-term partnerships |
413 | |||
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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
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- Multinational companies in London 3,652
- Financial Services companies in London 1,862
- Financial services firms in London 1,824
- SaaS companies in London 1,615
- Professional services firms in London 1,248
- Software Development companies in London 1,217
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- IT Services and IT Consulting companies in London 693
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- Hotel and hospitality groups in London 445
- Luxury brands in London 428
- AI-native companies in London 407
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