# Data and analytics companies headquartered in London

Tamtam tracks 302 data and analytics companies headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by RELX, LSEG and Kantar. Their median headcount is 3,437. Half of them were founded in 2000 or later.

London's data and analytics sector is characterized by large, established firms. RELX provides information-based analytics across various industries, while LSEG offers financial indexing and technology solutions. Kantar specializes in marketing data and analytics, and Clarivate delivers trusted intelligence to academia, life sciences, and intellectual property.

A notable pattern among these companies is their focus on information services and financial analytics. Many, including Informa and ION, were founded around the turn of the millennium, indicating a period of significant growth and establishment in the sector.

🇬🇧 London · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [RELX](https://www.tamtam.ai/c/relx) (relx.com)<br>Global provider of information-based analytics for professionals across industries, helping customers make informed decisions through innovative solutions and technologies | Technology, Information and Media | 🇬🇧 London | 37,600 |  |
| 2 | [LSEG](https://www.tamtam.ai/c/lseg) (lseg.com)<br>Provides financial indexing, benchmarking, analytic services, technology solutions, and integrated market infrastructure across data, capital markets, and post-trade. | Financial Services | 🇬🇧 London | 25,298 |  |
| 3 | [Kantar](https://www.tamtam.ai/c/kantar) (kantar.com)<br>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 |  |
| 4 | [Smollan](https://www.tamtam.ai/c/smollan) (smollan.com)<br>Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase. | Retail | 🇬🇧 London | 13,502 | 1931 |
| 5 | [Clarivate](https://www.tamtam.ai/c/clarivate) (clarivate.com)<br>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 |  |
| 6 | [Publicis Media](https://www.tamtam.ai/c/publicis-media) (publicisgroupe.com)<br>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 |  |
| 7 | [Informa](https://www.tamtam.ai/c/informa) (informa.com)<br>Leading international business in events, digital services, and academic knowledge, connecting specialists worldwide to learn, know, and do more in their fields | Information Services | 🇬🇧 London | 9,410 | 1998 |
| 8 | [Apex Group Ltd (UK & Ireland)](https://www.tamtam.ai/c/apex-group-ltd-uk-and-ireland) (apexgroup.com)<br>A global financial services provider with offices in over 50 countries, offering a wide range of services to asset managers, capital markets, and family offices | Financial Services | 🇬🇧 London | 9,281 | 2003 |
| 9 | [Acuity Analytics](https://www.tamtam.ai/c/acuity-analytics) (acuityanalytics.com)<br>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 |
| 10 | [ION](https://www.tamtam.ai/c/ion) (iongroup.com)<br>Innovative company providing trading and workflow automation software to financial institutions, corporations, and governments, empowering decision-making and accelerating processes | Software Development | 🇬🇧 London | 5,591 | 1998 |
| 11 | [LSEG Data & Analytics](https://www.tamtam.ai/c/lseg-data-and-analytics) (lseg.com)<br>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 |  |
| 12 | [YouGov](https://www.tamtam.ai/c/yougov) (yougov.com)<br>An international online research and analytics technology group providing unparalleled consumer insights for brands, media owners, and agencies worldwide | Market Research | 🇬🇧 London | 4,691 | 2000 |
| 13 | [Fitch Group, Inc.](https://www.tamtam.ai/c/fitch-group-inc) (fitch.group)<br>Global leader in financial information services with operations in 30+ countries Offers credit ratings, research, risk solutions, training, and venture investments Dual headquarters in London and New York | Financial Services | 🇬🇧 London | 4,203 | 1913 |
| 14 | [Playtech](https://www.tamtam.ai/c/playtech) (playtech.com)<br>Leading software and services supplier for the gambling industry, offering omni-channel solutions for online, mobile, and retail operations, including financial trading. | Software Development | 🇬🇧 London | 3,735 | 1999 |
| 15 | [Worldpanel](https://www.tamtam.ai/c/worldpanel) (worldpanelbynumerator.com)<br>Experts in global shopper and consumer behavior providing analytics for retail and marketing strategies, enabling smarter decisions for a better world | Market Research | 🇬🇧 London | 3,437 |  |
| 16 | [Stats Perform](https://www.tamtam.ai/c/stats-perform) (statsperform.com)<br>Global leader in sports technology providing unrivaled AI-powered sports data for media, tech, betting, and team performance solutions | Spectator Sports | 🇬🇧 London | 3,359 |  |
| 17 | [Toluna](https://www.tamtam.ai/c/toluna) (tolunacorporate.com)<br>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 |
| 18 | [Genius Sports](https://www.tamtam.ai/c/genius-sports-london) (geniussports.com)<br>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 |
| 19 | [Two Circles](https://www.tamtam.ai/c/two-circles) (twocircles.com)<br>Management of extensive fan data to enhance audience engagement and increase revenue for leading sports and entertainment organizations worldwide. | Marketing Services | 🇬🇧 London | 2,877 |  |
| 20 | [TradingView](https://www.tamtam.ai/c/tradingview) (tradingview.com)<br>Social network and charting platform for traders and investors, used by 50 million+ users worldwide with open source charts used by financial giants | Financial Services | 🇬🇧 London | 2,761 | 2011 |
| 21 | [ICAP](https://www.tamtam.ai/c/icap) (tpicap.com)<br>A leading markets operator providing electronic execution and information services for wholesale market participants, facilitating capital flow and supporting borrowing needs | Financial Services | 🇬🇧 London | 2,750 |  |
| 22 | [GlobalData Plc](https://www.tamtam.ai/c/globaldata-plc) (globaldata.com)<br>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 |
| 23 | [Third Bridge Group](https://www.tamtam.ai/c/third-bridge-group) (thirdbridge.com)<br>A global investment research firm delivering unique insights to help investment firms make better decisions through a team of 1,200+ employees | Information Services | 🇬🇧 London | 2,438 | 2007 |
| 24 | [Dialectica](https://www.tamtam.ai/c/dialectica) (dialectica.io)<br>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 | [Qube Research & Technologies](https://www.tamtam.ai/c/qube-research-and-technologies) (qube-rt.com)<br>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 |
| 26 | [London Stock Exchange](https://www.tamtam.ai/c/london-stock-exchange) (londonstockexchange.com)<br>Global financial marketplace providing extensive access to capital markets and liquidity across multiple asset classes for international businesses, governments, and investment funds. | Financial Services | 🇬🇧 London | 2,358 | 1698 |
| 27 | [Euromonitor International](https://www.tamtam.ai/c/euromonitor-international) (euromonitor.com)<br>Provides comprehensive global data analytics and research on markets, industries, economies, and consumers to support strategic business growth decisions. | Market Research | 🇬🇧 London | 2,176 | 1972 |
| 28 | [CACI Ltd](https://www.tamtam.ai/c/caci-ltd) (caci.co.uk)<br>Provides data, marketing, IT solutions, software, consulting services, and managed services to public and private sector clients. Improves sales, marketing, operations, and reduces costs. | Business Consulting and Services | 🇬🇧 London | 2,025 | 1975 |
| 29 | [Argus Media](https://www.tamtam.ai/c/argus-media) (argusmedia.com)<br>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 |
| 30 | [CFC](https://www.tamtam.ai/c/cfc) (cfc.com)<br>Specialist insurance provider leading in cyber risk, utilizing technology and data science for faster underwriting and protection of global businesses | Insurance | 🇬🇧 London | 1,896 | 1999 |

## 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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## The same list elsewhere in United Kingdom

- [Data and analytics companies in the United Kingdom](https://www.tamtam.ai/l/data-analytics-companies-united-kingdom) (505)

## The same list elsewhere

- [Data and analytics companies in the world](https://www.tamtam.ai/l/data-analytics-companies-in-the-world) (4,943)
- [Data and analytics companies in Europe](https://www.tamtam.ai/l/data-analytics-companies-in-europe) (2,591)

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Source: https://www.tamtam.ai/l/data-analytics-companies-london