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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Clarivateclarivate.com
A global information services provider connecting people and organizations to trusted intelligence in Academia & Government, Life Sciences & Healthcare, and Intellectual Property |
11,385 | |||
| 2 |
Informainforma.com
Leading international business in events, digital services, and academic knowledge, connecting specialists worldwide to learn, know, and do more in their fields |
9,410 | |||
| 3 |
IHS Markitspglobal.com
A company providing up-to-date financial data and information through a merger with another organization |
4,522 | |||
| 4 |
AlphaSightsalphasights.com
A global leader in knowledge on-demand connecting investors and business leaders with essential insights for success through round-the-clock coverage |
3,875 | |||
| 5 | 3,022 | ||||
| 6 |
GlobalData Plcglobaldata.com
A leading information services company helps organizations and decision-makers predict the future, make informed decisions, and gain a competitive edge |
2,711 | |||
| 7 |
Third Bridge Groupthirdbridge.com
A global investment research firm delivering unique insights to help investment firms make better decisions through a team of 1,200+ employees |
2,438 | |||
| 8 |
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 |
2,400 | |||
| 9 |
Argus Mediaargusmedia.com
Provides price assessments, news, analytics, consulting, data tools, and conferences for global energy and commodity market transparency and decision-making. |
2,024 | |||
| 10 |
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 |
1,868 | |||
| 11 |
Ascential – Part of the Informa Groupascential.com
organizes and manages experience-driven B2B events, provides industry intelligence and advisory services across multiple key business verticals |
1,670 | |||
| 12 |
Euromoney Institutional Investordelinian.com
Global B2B information-services business providing actionable data, analysis, intelligence, and market participant access across multiple international markets. |
1,487 | |||
| 13 |
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 | |||
| 14 | 969 | ||||
| 15 | 966 | ||||
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 |
Fitch Solutionsfitchsolutions.com
Provides specialized financial data, analytics, and expert insights on credit risk, markets, ESG, and investment strategies worldwide. |
965 | |||
| 17 |
Fastmarketsfastmarkets.com
A leading global provider of price reporting, analytics, and events services for key commodity markets, striving for market transparency and sustainability |
950 | |||
| 18 |
Markitspglobal.com
A global financial information and services provider focusing on independent data, trade processing, technology platforms, and managed services for institutional clients |
666 | |||
| 19 |
FGE NexantECAfgenexanteca.com
provides independent research, analysis, consultation, and advisory services with unique insights and strong relationships in oil and gas markets worldwide |
665 | |||
| 20 |
B2B Marketingb2bmarketing.net
Professional community for B2B marketers to share knowledge, access training, events, industry news, and best practice advice online. |
634 | |||
| 21 |
Informa Connectinformaconnect.com
A global leader in producing live events and digital communities, specializing in finance, life sciences, and technology to help professionals grow and connect |
612 | |||
| 22 | 565 | ||||
| 23 |
proSapientprosapient.com
A global firm offering fast, accurate primary research and expert networking services to institutional investors, consultants, and corporate clients worldwide Powered by AI technology |
533 | |||
| 24 |
GlobalData Healthcareglobaldata.com
GlobalData provides actionable insight and consulting solutions for the pharmaceutical and medical device sectors, helping businesses achieve growth and increase value |
524 | |||
| 25 |
UK Visa Jobsukvisajobs.com
Job search platform catering to students, graduates, and professionals needing visa sponsorship or work permit to work in the UK |
475 | |||
| 26 |
Autovistaautovistagroup.com
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 |
474 | |||
| 27 |
CONTEXTcontextworld.com
A global company providing forecasts, analytics, and data-management solutions for major technology companies, tracking over $200 billion in sales annually Operating worldwide |
455 | |||
| 28 |
ISI Marketsisimarkets.com
Provides comprehensive, authoritative financial data and market intelligence, leveraging advanced analytics to support investment, strategic, and risk decisions in emerging markets. |
449 | |||
| 29 |
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. |
439 | |||
| 30 |
Energy Aspectsbit.ly
Provides real-time market insights and data solutions to support decision-making in energy and financial sectors worldwide. |
374 | |||
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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 15, 2026.
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