# Top 30 Information Services companies in London

Tamtam tracks 56 Information Services companies headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by Clarivate, Informa and IHS Markit. Their median headcount is 966. Half of them were founded in 2007 or later.

These London-based companies specialize in information services, offering a range of data, analytics, and expert insights across various sectors. The list includes established firms like Clarivate, a global information services provider, and Informa, which focuses on events, digital services, and academic knowledge. Other notable companies are IHS Markit, supplying financial data, and DMGT, managing diverse information and news businesses. These firms primarily serve business and investment professionals.

A significant number of these information services companies were founded in the 2000s, indicating a period of growth in this sector. Examples include Informa (1998), AlphaSights (2008), GlobalData Plc (2010), and Dialectica (2015). This suggests a common era of establishment for many of the mid-sized and larger players in London's information services market.

🇬🇧 London · 30 companies · Updated Nov 15, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [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 |  |
| 2 | [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 |
| 3 | [IHS Markit](https://www.tamtam.ai/c/ihs-markit) (spglobal.com)<br>A company providing up-to-date financial data and information through a merger with another organization | Information Services | 🇬🇧 London | 4,522 |  |
| 4 | [AlphaSights](https://www.tamtam.ai/c/alphasights) (alphasights.com)<br>A global leader in knowledge on-demand connecting investors and business leaders with essential insights for success through round-the-clock coverage | Information Services | 🇬🇧 London | 3,875 | 2008 |
| 5 | [DMGT](https://www.tamtam.ai/c/dmgt) (dmgt.com)<br>Management of companies delivering information, analysis, insight, events, news, and entertainment to businesses and consumers with market leadership. | Information Services | 🇬🇧 London | 3,022 |  |
| 6 | [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 |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |
| 10 | [Corsearch](https://www.tamtam.ai/c/corsearch) (corsearch.com)<br>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 |  |
| 11 | [Ascential – Part of the Informa Group](https://www.tamtam.ai/c/ascential-part-of-the-informa-group) (ascential.com)<br>organizes and manages experience-driven B2B events, provides industry intelligence and advisory services across multiple key business verticals | Information Services | 🇬🇧 London | 1,670 |  |
| 12 | [Euromoney Institutional Investor](https://www.tamtam.ai/c/euromoney-institutional-investor) (delinian.com)<br>Global B2B information-services business providing actionable data, analysis, intelligence, and market participant access across multiple international markets. | Information Services | 🇬🇧 London | 1,487 |  |
| 13 | [Merit Data & Technology India](https://www.tamtam.ai/c/merit-data-and-technology-india) (meritdata-tech.com)<br>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 |
| 14 | [ICIS](https://www.tamtam.ai/c/icis) (icis.com)<br>Global provider of independent commodity intelligence services, connecting data, markets, and customers to optimize business decisions and resource management worldwide | Information Services | 🇬🇧 London | 969 |  |
| 15 | [WGSN](https://www.tamtam.ai/c/wgsn) (wgsn.com)<br>Global trend forecasting company helping brands create products for future consumers through consumer insights, design forecasts, data analytics, and expert advisory services | Information Services | 🇬🇧 London | 966 | 1998 |
| 16 | [Fitch Solutions](https://www.tamtam.ai/c/fitch-solutions) (fitchsolutions.com)<br>Provides specialized financial data, analytics, and expert insights on credit risk, markets, ESG, and investment strategies worldwide. | Information Services | 🇬🇧 London | 965 | 2018 |
| 17 | [Fastmarkets](https://www.tamtam.ai/c/fastmarkets) (fastmarkets.com)<br>A leading global provider of price reporting, analytics, and events services for key commodity markets, striving for market transparency and sustainability | Information Services | 🇬🇧 London | 950 | 1882 |
| 18 | [Markit](https://www.tamtam.ai/c/markit-london) (spglobal.com)<br>A global financial information and services provider focusing on independent data, trade processing, technology platforms, and managed services for institutional clients | Information Services | 🇬🇧 London | 666 |  |
| 19 | [FGE NexantECA](https://www.tamtam.ai/c/fge-nexanteca) (fgenexanteca.com)<br>provides independent research, analysis, consultation, and advisory services with unique insights and strong relationships in oil and gas markets worldwide | Information Services | 🇬🇧 London | 665 | 1983 |
| 20 | [B2B Marketing](https://www.tamtam.ai/c/b2b-marketing) (b2bmarketing.net)<br>Professional community for B2B marketers to share knowledge, access training, events, industry news, and best practice advice online. | Information Services | 🇬🇧 London | 634 |  |
| 21 | [Informa Connect](https://www.tamtam.ai/c/informa-connect) (informaconnect.com)<br>A global leader in producing live events and digital communities, specializing in finance, life sciences, and technology to help professionals grow and connect | Information Services | 🇬🇧 London | 612 |  |
| 22 | [PI](https://www.tamtam.ai/c/pi) (pi.tv)<br>The company inspires manufacturers with events, online content, and networking forums to improve businesses, innovate, and shape the world | Information Services | 🇬🇧 London | 565 | 2006 |
| 23 | [proSapient](https://www.tamtam.ai/c/prosapient) (prosapient.com)<br>A global firm offering fast, accurate primary research and expert networking services to institutional investors, consultants, and corporate clients worldwide Powered by AI technology | Information Services | 🇬🇧 London | 533 | 2017 |
| 24 | [GlobalData Healthcare](https://www.tamtam.ai/c/globaldata-healthcare) (globaldata.com)<br>GlobalData provides actionable insight and consulting solutions for the pharmaceutical and medical device sectors, helping businesses achieve growth and increase value | Information Services | 🇬🇧 London | 524 | 2010 |
| 25 | [UK Visa Jobs](https://www.tamtam.ai/c/uk-visa-jobs) (ukvisajobs.com)<br>Job search platform catering to students, graduates, and professionals needing visa sponsorship or work permit to work in the UK | Information Services | 🇬🇧 London | 475 | 2021 |
| 26 | [Autovista](https://www.tamtam.ai/c/autovista) (autovistagroup.com)<br>This company provides pricing and specification intelligence for European automotive decision-makers by analyzing complex data to simplify decision-making throughout a vehicle's lifecycle | Information Services | 🇬🇧 London | 474 | 1933 |
| 27 | [CONTEXT](https://www.tamtam.ai/c/context) (contextworld.com)<br>A global company providing forecasts, analytics, and data-management solutions for major technology companies, tracking over $200 billion in sales annually Operating worldwide | Information Services | 🇬🇧 London | 455 |  |
| 28 | [ISI Markets](https://www.tamtam.ai/c/isi-markets) (isimarkets.com)<br>Provides comprehensive, authoritative financial data and market intelligence, leveraging advanced analytics to support investment, strategic, and risk decisions in emerging markets. | Information Services | 🇬🇧 London | 449 | 1992 |
| 29 | [Law Business Research](https://www.tamtam.ai/c/law-business-research) (centellic.com)<br>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 |  |
| 30 | [Energy Aspects](https://www.tamtam.ai/c/energy-aspects) (bit.ly)<br>Provides real-time market insights and data solutions to support decision-making in energy and financial sectors worldwide. | Information Services | 🇬🇧 London | 374 | 2012 |

## 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 15, 2026.

## More company lists in London

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## The same list elsewhere in United Kingdom

- [Information Services companies in the United Kingdom](https://www.tamtam.ai/l/information-services-companies-united-kingdom) (100)

## The same list elsewhere

- [Information Services companies in the world](https://www.tamtam.ai/l/information-services-companies-in-the-world) (753)
- [Information Services companies in Europe](https://www.tamtam.ai/l/information-services-companies-in-europe) (398)

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Source: https://www.tamtam.ai/l/information-services-companies-london