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AI companies headquartered in London

Tamtam tracks 282 AI companies headquartered in London. This list ranks the 100 largest by number of employees on LinkedIn, led by GSK, Barclays and BAE Systems. Their median headcount is 980. Half of them were founded in 2010 or later.

🇬🇧 London100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
GSKgsk.com

Uniting science, technology, and talent to advance healthcare and disease prevention through collaborative innovation and community engagement.

Pharmaceutical Manufacturing 🇬🇧 London 92,092 n/a
2
Barclayshome.barclays

A British universal bank with global presence, offering consumer banking, payments, corporate and investment banking services, supported by technology and operational solutions

Financial Services 🇬🇧 London 82,417 n/a
3
BAE Systemsbaesystems.com

The company provides advanced technology-led defense, aerospace, and security solutions, with a skilled workforce in over 40 countries, focusing on innovation and long-term commitment

Defense and Space Manufacturing 🇬🇧 London 55,143 1999
4
Kantarkantar.com

Global leader in marketing data and analytics with deep expertise, innovative technology, and insights to help clients understand people and drive growth worldwide

Market Research 🇬🇧 London 24,976 n/a
5
Clarivateclarivate.com

A global information services provider connecting people and organizations to trusted intelligence in Academia & Government, Life Sciences & Healthcare, and Intellectual Property

Information Services 🇬🇧 London 11,385 n/a
6
Publicis Mediapublicisgroupe.com

A global media company within Publicis Groupe, employing data-driven solutions and platform-based technologies to deliver client value and drive growth internationally

Advertising Services 🇬🇧 London 11,033 n/a
7
Google DeepMinddeepmind.google

Advances artificial intelligence with breakthrough research. Solves complex problems like disease diagnosis, energy saving, and protein folding with safe, ethical AI.

Research Services 🇬🇧 London 9,665 2010
8
Acuity Analyticsacuityanalytics.com

Provides bespoke research, analytics, and technology solutions to financial services, helping institutions operate efficiently and unlock human capital to drive revenue.

Financial Services 🇬🇧 London 7,619 2003
9
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

IT Services and IT Consulting 🇬🇧 London 6,088 1997
10
LSEG Data & Analyticslseg.com

A global provider of financial markets data and infrastructure, enabling customers to gain insights through data, feeds, analytics, and workflow solutions

Financial Services 🇬🇧 London 5,147 n/a
11
Fitness AIguden.org

Fitness AI is a mobile app using artificial intelligence to personalize workout plans, track progress, and motivate users towards achieving health and fitness goals

Wellness and Fitness Services 🇬🇧 London 5,137 n/a
12
Monksmonks.com

Provides global marketing, technology services, AI-driven data science, and content production to help brands accelerate business and outpace competition.

Advertising Services 🇬🇧 London 5,067 2001
13
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

IT Services and IT Consulting 🇬🇧 London 4,101 n/a
14
Man Groupman.com

Global firm managing alternative investments, seeking outperformance for clients through systematic, discretionary, and solutions-based strategies across various asset classes.

Investment Management 🇬🇧 London 3,987 1783
15
WPP Productionwppproduction.com

Global content production company integrating creative producers, AI, and virtual production to deliver innovative, fast, and scalable marketing content solutions.

Advertising Services 🇬🇧 London 3,507 n/a
16
Infobipinfobip.com

Global leader in omnichannel engagement, providing messaging tools and solutions for customer engagement, authentication, and security with a strong focus on quality engineering

IT Services and IT Consulting 🇬🇧 London 3,501 2006
17
TryHackMetryhackme.com

It simplifies learning and teaching Cybersecurity through prebuilt courses and cloud-hosted virtual machines, ideal for CTFs, workshops, and training.

Computer and Network Security 🇬🇧 London 3,445 2018
18
Hogarthwppproduction.com

Creative production company combining craft, insight, and technology to bring creative work to life across global locations.

Advertising Services 🇬🇧 London 3,262 2008
19
Starlingstarlingbank.com

This company is a digital bank offering fast technology, fair service, and honest values, focused on solving customer problems and building sustainable solutions

Banking 🇬🇧 London 3,231 2014
20
Tolunatolunacorporate.com

Global leader providing advanced technology and comprehensive solutions for data-driven market research, leveraging AI and extensive global panels.

Market Research 🇬🇧 London 3,218 2000
21
Genius Sportsgeniussports.com

This company delivers technology and expertise to sports, betting, and media partners worldwide, enhancing data collection, fan engagement, and overall performance

Software Development 🇬🇧 London 3,054 2001
22
NGA Human Resources, an Alight companyalight.com

Global provider of HR solutions, pioneering digital HR, payroll, compliance, and workforce data to enhance employee experiences, save costs, and transform organizations worldwide

Human Resources Services 🇬🇧 London 2,789 n/a
23
GlobalData Plcglobaldata.com

A leading information services company helps organizations and decision-makers predict the future, make informed decisions, and gain a competitive edge

Information Services 🇬🇧 London 2,711 2010
24
Dialecticadialectica.io

A B2B information services firm connecting professionals with industry experts worldwide through a trusted knowledge-sharing platform, recognized for growth and workplace excellence

Information Services 🇬🇧 London 2,400 2015
25
Mimecastmimecast.com

Protects humans, data, and AI agents through a unified platform, securing the workforce and their interactions with AI from cyberattacks.

Computer and Network Security 🇬🇧 London 2,396 2003
26
Qube Research & Technologiesqube-rt.com

Global quant and systematic investment manager using technology and data for scientific approach to investing, driving innovation for high quality returns Multiple open positions available

Financial Services 🇬🇧 London 2,393 2018
27
Checkout.comcheckout.com

A financial technology company providing a high-performance payments platform for enterprise and scaling businesses worldwide, processing payments, payouts, and managing card programs

Financial Services 🇬🇧 London 2,343 2012
28
Anyone ☎️anyo.ne

The company helps individuals enhance their soft skills through short, five-minute sessions to support their journey as effective leaders

Technology, Information and Internet 🇬🇧 London 2,255 n/a
29
Quantanitequantanite.com

The company provides Conversational Gen AI chatbot solutions to automate customer interactions and enhance agent performance with a focus on human touch and empathy

Technology, Information and Internet 🇬🇧 London 2,173 2014
30
Krakenkraken.tech

AI-powered operating system enhancing customer satisfaction, product innovation, revenue generation, and operational savings for energy, water, and telco utilities.

Technology, Information and Internet 🇬🇧 London 2,125 n/a
31
Argus Mediaargusmedia.com

Provides price assessments, news, analytics, consulting, data tools, and conferences for global energy and commodity market transparency and decision-making.

Information Services 🇬🇧 London 2,024 1970
32
Canonicalcanonical.com

Publishing Ubuntu, popular enterprise Linux, open source delivery, cloud to edge, secure, cost-effective, global community, developer platform, remote-first company.

Software Development 🇬🇧 London 2,001 2004
33
Corsearchcorsearch.com

Revolutionizing brand protection with AI-powered solutions, trademark research, and IP protection services to help companies secure, monitor, and enforce their brands globally

Information Services 🇬🇧 London 1,868 n/a
34
Oioi.co.uk

This company specializes in developing immersive omnichannel campaigns for healthcare marketing, focusing on content personalization and driving behavioral change

Advertising Services 🇬🇧 London 1,593 1997
35
Ocean Infinityoceaninfinity.com

Innovative company using robotic technology for marine operations, data collection, and maritime solutions with a focus on sustainability and innovation

Robotics Engineering 🇬🇧 London 1,591 2017
36
Connectweconnect.tech

Communication experts providing solutions in Contact Centre, Unified Communications, and Network Services, delivering digital transformation through bespoke strategies for businesses globally

IT Services and IT Consulting 🇬🇧 London 1,387 1990
37
Influencerinfluencer.com

Global agency delivering creator-first solutions through proprietary technology and platform partnerships to drive measurable brand impact, humanize businesses, and connect with audiences.

Advertising Services 🇬🇧 London 1,346 2015
38
ElevenLabselevenlabs.io

It develops AI audio models for speech and sound effects, enabling content creation, localization, and accessibility for various industries.

Research Services 🇬🇧 London 1,291 2022
39
FE fundinfofefundinfo.com

By providing accurate data, technology solutions, research, and expert insights, we connect the fund management industry to inform better investment decisions

Financial Services 🇬🇧 London 1,216 n/a
40
Leverage Edulvrg.in

A counselling product for young individuals to choose their career path, study abroad, and prepare for exams, supported by various apps and a SaaS operating system for universities

Higher Education 🇬🇧 London 1,204 n/a
41
G-Researchgresearch.com

A leading quantitative research and technology firm tackling big questions in finance using machine learning and big data for predicting market movements

Financial Services 🇬🇧 London 1,153 2001
42
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

Information Services 🇬🇧 London 1,128 2004
43
Smartstreamsmart.stream

Provides financial institutions with accurate, timely data insights to streamline operations, reduce costs, and ensure regulatory compliance confidently.

Financial Services 🇬🇧 London 1,114 2000
44
Government Digital Servicegds.blog.gov.uk

Designing and protecting user experience for digital government, delivering exceptional initiatives, and solving high-priority challenges to make services more accessible and inclusive

Government Relations Services 🇬🇧 London 1,110 2011
45
EZRAhelloezra.com

This company provides professional coaching services at scale, using technology, a global network of coaches, and metrics for personalized growth

Professional Training and Coaching 🇬🇧 London 1,109 n/a
46
Brandwatchbrandwatch.com

It provides consumer intelligence, social media management, and influencer management to help businesses understand and engage with their customers effectively.

Software Development 🇬🇧 London 1,100 n/a
47
Onclusiveonclusive.com

Global PR and Communications partner offering data-driven insights, consultancy, workflow tools, and media monitoring to elevate performance and prove value

Public Relations and Communications Services 🇬🇧 London 1,098 n/a
48
Facultyfaculty.ai

The company develops and implements safe AI systems integrating human and artificial intelligence for optimized performance

Technology, Information and Internet 🇬🇧 London 1,073 2014
49
Wayvewayve.ai

Leader in AI-driven autonomous vehicle technology, pioneering AV20 for fleet operators to unlock benefits at scale Diverse team focused on breakthrough solutions

Software Development 🇬🇧 London 1,028 2017
50
VeriParkveripark.com

This global solutions provider enables financial institutions to enhance customer experiences, drive engagement, and increase revenue through intelligent customer experience solutions

Software Development 🇬🇧 London 980 1998
51
Indeed Flexindeedflex.com

Revolutionary app connecting job seekers with temporary work, offering flexibility in where, when, and how they work while supporting employers with high-quality workers

Staffing and Recruiting 🇬🇧 London 978 2015
52
ICISicis.com

Global provider of independent commodity intelligence services, connecting data, markets, and customers to optimize business decisions and resource management worldwide

Information Services 🇬🇧 London 969 n/a
53
Allica Bankallica.bank

A leading UK fintech company dedicated to supporting small and medium businesses with modern technology, local relationships, and personalized banking services

Financial Services 🇬🇧 London 910 2019
54
Quantexaquantexa.com

Global platform connecting siloed systems to visualize complex relationships, providing single views of data for risk mitigation and strategic organizational decision making.

Software Development 🇬🇧 London 895 2016
55
FCM Travelfcmtravel.com

Corporate travel management with a modern platform, excellent customer service, enhanced traveler experience, cost savings, and data visibility for better business travel.

Travel Arrangements 🇬🇧 London 844 2004
56
Exinityexinity.com

A global company empowering ambitious individuals to achieve financial independence through innovative trading and investing products and risk management tools

Financial Services 🇬🇧 London 827 1998
57
Synthesiasynthesia.io

AI-powered video creation platform enabling companies to produce videos in 140 languages, saving significant time and budget costs.

Software Development 🇬🇧 London 800 2017
58
Kiki-insurance.com

Ki leverages technology and data to streamline risk placement at Lloyd’s of London, providing instant underwriting decisions and expert assistance

Insurance 🇬🇧 London 786 2020
59
GAINthisisgain.com

Creative-led and insight-driven company blending data, technology, and creativity to deliver meaningful impact and bold strategies that move people, brands, and businesses forward.

Marketing Services 🇬🇧 London 759 n/a
60
GWIgwi.com

This company provides trusted consumer insights globally for brands, agencies, and media They offer unique studies and custom research services

Data Infrastructure and Analytics 🇬🇧 London 758 2009
61
Incubetaincubeta.com

A global team of 800+ experts across 20 offices offering digital services to unlock business growth for clients like Google, Hyundai, and Netflix

Advertising Services 🇬🇧 London 750 2001
62
Marshall Wacemwam.com

A global asset manager established in 1997, providing a variety of alternative, long-only, and custom investment options to a wide range of investors

Investment Management 🇬🇧 London 742 1997
63
LexisNexis UKlexisnexis.co.uk

Provider of legal, regulatory, and business information and analytics helping customers improve productivity, decision-making, and support rule of law worldwide.

Law Practice 🇬🇧 London 719 n/a
64
Sabiobit.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 🇬🇧 London 718 1998
65
Kaluzakaluza.com

Energy software company enabling energy suppliers to streamline operations, enhance customer service, and drive decarbonisation through smart technology solutions

Technology, Information and Internet 🇬🇧 London 710 n/a
66
Eagle Eyeeagleeye.com

Enabling businesses to create personalized one-to-one relationships with customers through a digital marketing platform, connecting online and offline interactions in real-time

Retail 🇬🇧 London 709 2003
67
UBIOub.io

UBIO connects websites and APIs to collect data for clients like Google and trivago, enabling them to sell tickets and collect information

Technology, Information and Internet 🇬🇧 London 706 2013
68
MVFmvfglobal.com

This company helps businesses grow by delivering high volumes of new customers through technology and cross-channel marketing teams on a pay-per-lead basis

Technology, Information and Internet 🇬🇧 London 695 2009
69
Cleoweb.meetcleo.com

AI-powered platform providing personalized financial insights and tools through a chat assistant to improve users' money management and saving habits.

Financial Services 🇬🇧 London 686 2016
70
OakNorthoaknorth.co.uk

digital bank offering bespoke credit and banking services to UK and US businesses with £1m-£100m turnover, supporting growth

Financial Services 🇬🇧 London 680 2015
71
Digital Sciencedigital-science.com

AI-focused technology company providing innovative solutions to researchers, universities, funders, industry, and publishers advancing global research.

Software Development 🇬🇧 London 678 2010
72
Landscapelandscape.vc

Providing products and communities for entrepreneurs creating the future, and investors supporting them

Venture Capital and Private Equity Principals 🇬🇧 London 669 n/a
73
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

Translation and Localization 🇬🇧 London 661 n/a
74
Lolly.comlolly.com

An influencer marketplace with a vast creator database helping brands automate influencer marketing campaigns and enhance brand presence

Advertising Services 🇬🇧 London 659 2023
75
Kantar Consultingkantar.com

Leading marketing data and analytics company providing global and local insights into how people think, feel, and act to help inspire growth

Business Consulting and Services 🇬🇧 London 655 2017
76
CodeGen Internationalcodegen.co.uk

A global travel technology provider delivering innovative, scalable reservation systems to leading organizations worldwide, automating business processes with cutting-edge technology

Software Development 🇬🇧 London 645 1999
77
SMGsmg.team

Simplifies retail media landscapes through data-driven campaigns and technology to create personalized shopping experiences and drive growth for major global consumer brands.

Advertising Services 🇬🇧 London 625 n/a
78
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.

IT Services and IT Consulting 🇬🇧 London 614 2015
79
Agilisysagilisys.co.uk

A trusted leader in delivering data-driven solutions and Generative AI products tailored to healthcare, government, and public sector organizations

IT Services and IT Consulting 🇬🇧 London 612 1998
80
LanguageLine Solutions UKlanguageline.com

LanguageLine Solutions offers interpreting, translation, and transcription services across the UK, specializing in over 200 languages and British Sign Language

Translation and Localization 🇬🇧 London 606 1990
81
9fin9fin.com

Provides real-time news, comprehensive data, and advanced AI analytics for global debt markets, offering complete visibility across public, private, and distressed debt.

Financial Services 🇬🇧 London 599 2016
82
Infiniti Research Ltd.infinitiresearch.com

Leading provider of market and customer intelligence solutions, offering research and advisory services through unique methods to deliver actionable insights and robust market data.

Market Research 🇬🇧 London 582 2003
83
Moody's Analytics Knowledge Servicesacuityanalytics.com

Provider of research, analytics, and business intelligence for the financial services sector, helping clients increase revenues, innovate with technology, and transform operations

Financial Services 🇬🇧 London 571 n/a
84
MYCOM OSImycom-osi.com

Provide network assurance and service experience solutions for CSPs and enterprises to manage 5G and enterprise services efficiently.

Telecommunications 🇬🇧 London 557 1997
85
The Smart Cubethesmartcube.com

Providing custom research, advanced analytics, and technology to transform data into actionable insights for improved business performance.

Business Consulting and Services 🇬🇧 London 547 n/a
86
Dextdext.com

Advanced AI platform automates bookkeeping by extracting accurate financial data from receipts and invoices, empowering businesses and accountants.

Software Development 🇬🇧 London 518 2010
87
Verticevertice.one

A spend optimization platform leveraging automation and machine learning to save companies up to 25% on SaaS and cloud costs

Software Development 🇬🇧 London 509 2021
88
ComplyAdvantagecomplyadvantage.com

Empowers businesses to eliminate financial crime using AI, offering a unified platform and extensive partner ecosystem for compliance, growth, and regulatory trust.

Software Development 🇬🇧 London 506 2014
89
Dotdigitaldotdigital.com

An all-in-one customer experience and data platform enabling marketers to exceed expectations with personalized cross-channel journeys and automated experiences

Technology, Information and Internet 🇬🇧 London 465 1999
90
Payhawkpayhawk.com

AI-native spend management platform. Orchestrates global money across bills, cards, expenses, travel, procurement for control, automation, savings. Provides global money account.

Financial Services 🇬🇧 London 465 2018
91
Cognismcognism.com

Provides accurate, compliant B2B data and sales intelligence, enabling sales teams to find the right contacts, reach them with confidence, and close deals.

Software Development 🇬🇧 London 456 2015
92
Yotiyoti.com

privacy-focused identity verification and age verification solutions helping businesses and individuals build trust while reducing fraud and enhancing data control

Software Development 🇬🇧 London 454 2014
93
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.

Software Development 🇬🇧 London 444 2006
94
LoopMeloopme.com

A technology company leveraging artificial intelligence to enhance brand advertising performance and outcomes

Advertising Services 🇬🇧 London 440 2012
95
Law Business Researchcentellic.com

Transforms client decision-making on strategy, growth, and risk through indispensable data, intelligence, and analysis, leveraging combined strengths in data, insight, and market access.

Information Services 🇬🇧 London 439 n/a
96
Blisblis.com

An audience-first platform that delivers targeted advertising through location data and rich datasets, helping brands achieve their goals without relying on personal data

Advertising Services 🇬🇧 London 434 2004
97
Benthanksben.com

A global flexible benefits platform reshaping the world of work by connecting the benefits ecosystem for better outcomes and work-life integration

Software Development 🇬🇧 London 424 2019
98
Mappmapp.com

SaaS platform unifies customer data, extracts insights, and automates personalized cross-channel marketing campaigns to enhance customer engagement and loyalty.

Software Development 🇬🇧 London 421 n/a
99
InstaDeepinstadeep.com

It specializes in decision-making AI, applying machine learning across various sectors, and focuses on knowledge sharing and nurturing talent.

Software Development 🇬🇧 London 405 2014
100
Cerillion Technologiescerillion.com

A leading provider of billing, charging, and customer management systems for communication providers worldwide, delivering cost-effective solutions to business challenges

Telecommunications 🇬🇧 London 392 1999

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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 Oct 24, 2026.

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