These London-based companies primarily operate in media production and distribution, information services, and publishing. The list includes large, established organizations like the BBC, a public service broadcaster, and RELX, a global provider of information-based analytics. Other significant firms are Pearson, a leader in learning content, and Informa, which specializes in events, digital services, and academic knowledge.
A notable pattern is the dominance of broadcast media, with several BBC divisions (BBC News, BBC Studios) alongside ITV and Formula 1. Many of these companies have a long history, such as The Economist, founded in 1843, indicating a mature and well-established media sector in London.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 42,697 | ||||
| 2 | 37,600 | ||||
| 3 |
Pearsonpearson.com
A global leader in learning, offering digital content, assessments, qualifications, and data to create vibrant and enriching learning experiences worldwide |
13,596 | |||
| 4 |
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 | |||
| 5 | 9,410 | ||||
| 6 |
Financial Timesft.com
provides authoritative, accurate business news and information with a large digital subscription base, serving the global business community. |
9,092 | |||
| 7 |
ITVitvplc.com
A leading UK media company shaping culture, known for famous productions and digital innovation, fostering a culture of inclusivity and growth |
8,903 | |||
| 8 | 7,147 | ||||
| 9 |
The Economisteconomist.com
Global news and analysis provider helping individuals understand the world; offering subscriptions for in-depth insights and respecting personal data privacy |
6,694 | |||
| 10 |
BBC Studiosbbcstudios.com
BBC Studios is a leading content studio and channels & streaming business known for top-quality, award-winning shows and global distribution of British content |
6,277 | |||
| 11 |
Formula 1formula1.com
Delivering Formula 1's global spectacle through technical infrastructure, data analysis, content production, hospitality programs, and innovative marketing to engage fans worldwide |
6,081 | |||
| 12 | 5,409 | ||||
| 13 |
News UKnewscareers.co.uk
Leading UK and Ireland media company offering newspapers, radio stations, digital content, and events reaching nearly 40 million monthly audience. |
5,157 | |||
| 14 |
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 |
5,147 | |||
| 15 |
Globalglobal.com
Leading UK media company operating national radio stations, digital platforms, and extensive outdoor advertising networks across major transport and urban locations. |
4,926 | |||
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 |
DAZNdazngroup.com
Global sports media innovators using cutting-edge technology to revolutionize the industry, providing sports streaming services and fostering an inclusive, diverse work environment |
4,092 | |||
| 17 |
Futurefutureplc.com
Global specialist media platform creating expert original content through websites, magazines, events, and social spaces reaching millions. |
3,900 | |||
| 18 | 3,293 | ||||
| 19 | 3,022 | ||||
| 20 |
The Guardiantheguardian.com
A leading publisher of theguardiancom, Guardian US, and Guardian Australia, known for agenda-setting journalism and investigative reporting worldwide |
2,944 | |||
| 21 |
Channel 4channel4.com
Free-to-air UK broadcaster offering multiple TV channels and streaming, commissioning independent content, focusing on young audiences and British film investment. |
2,807 | |||
| 22 |
Saga plc.saga.co.uk
A dynamic company focused on providing exceptional experiences for people over 50, driving positive change in markets and communities |
2,622 | |||
| 23 |
Hachette UKhachette.co.uk
Publishing diverse books including fiction, non-fiction, children's books, educational materials, puzzles, gifts, games, e-books, and audiobooks globally. |
2,219 | |||
| 24 |
Fremantlefremantle.com
Producing and delivering premium, multi-genre entertainment content globally through a network of independent content creators and a world-leading digital business |
2,155 | |||
| 25 |
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 | |||
| 26 |
Eurosportwbdsports.com
Leading sport destination in Europe with a focus on live streaming, Olympic coverage, cycling, tennis, and winter sports events, and online sports news |
1,989 | |||
| 27 |
Penguin Random House UKpenguin.co.uk
Publishing diverse voices globally through numerous imprints, combining creativity, technology, and collaboration to reach wide audiences. |
1,950 | |||
| 28 |
The Business of Fashionbusinessoffashion.com
A global fashion media company providing industry insights, resources, events, and online learning for fashion professionals, students, and entrepreneurs worldwide |
1,949 | |||
| 29 |
Reach plcreachplc.com
Largest UK and Ireland commercial news publisher connecting audiences through over 120 brands including national, local, and US titles. |
1,756 | |||
| 30 |
Royal Society of Chemistryrsc.org
This company advances excellence in chemical sciences, supports over 50,000 members, and is a renowned publisher of high-quality chemical science knowledge |
1,618 | |||
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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.
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