# 30 leading companies with in-house R&D in London

Tamtam tracks 477 companies with in-house R&D headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by Shell, Vodafone and GSK. Their median headcount is 31,649.

These London-based companies with in-house R&D are primarily large, established groups across diverse sectors. Key players include Shell and bp, both global energy companies transitioning to lower-carbon solutions. Vodafone and BT Group are major telecommunications providers connecting people globally, while GSK focuses on advancing healthcare through science and technology. Sainsbury's is a leading UK retailer with a strong digital presence, and BAE Systems provides advanced defense and security solutions.

A notable pattern among these companies is their common headquarters in London, indicating the city's role as a hub for corporate R&D. The industries represented range from oil and gas and telecommunications to pharmaceutical manufacturing, retail, and defense, showcasing a broad spectrum of research and development activities within the capital.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Shell](https://www.tamtam.ai/c/shell) (shell.com)<br>A global energy company with a focus on cleaner energy solutions, serving millions of customers through retail service stations worldwide | Oil and Gas | 🇬🇧 London | 208,511 |  |
| 2 | [Vodafone](https://www.tamtam.ai/c/vodafone) (vodafone.com)<br>Using technology to connect people globally, drive social change, and improve lives while emphasizing the importance of humanity and collaboration | Telecommunications | 🇬🇧 London | 142,740 | 1982 |
| 3 | [GSK](https://www.tamtam.ai/c/gsk) (gsk.com)<br>Uniting science, technology, and talent to advance healthcare and disease prevention through collaborative innovation and community engagement. | Pharmaceutical Manufacturing | 🇬🇧 London | 92,092 |  |
| 4 | [bp](https://www.tamtam.ai/c/bp) (bp.com)<br>Investing in a balanced energy system by transitioning from oil and gas to lower-carbon energy, convenience stores, and power trading | Oil and Gas | 🇬🇧 London | 85,000 | 1909 |
| 5 | [Kingfisher plc](https://www.tamtam.ai/c/kingfisher-plc) (kingfisher.com)<br>International home improvement company with 1,900 stores across Europe Offering products and services for consumers and trade professionals to create better homes | Retail | 🇬🇧 London | 80,000 |  |
| 6 | [BT Group](https://www.tamtam.ai/c/bt-group) (bt.com)<br>A global communications services company connecting people through technology to address challenges like the pandemic, climate change, and cyber security | Telecommunications | 🇬🇧 London | 73,712 |  |
| 7 | [Sainsbury's](https://www.tamtam.ai/c/sainsbury-s) (sainsburys.jobs)<br>A leading UK retailer with over 1400 stores and a strong digital presence, offering affordable, greener products and convenient financial services to customers | Retail | 🇬🇧 London | 68,549 | 1869 |
| 8 | [BAE Systems](https://www.tamtam.ai/c/bae-systems) (baesystems.com)<br>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 |
| 9 | [FCA Fiat Chrysler Automobiles](https://www.tamtam.ai/c/fca-fiat-chrysler-automobiles) (stellantis.com)<br>A leading automaker and mobility provider now known as Stellantis, dedicated to creating innovative transportation solutions for the future | Motor Vehicle Manufacturing | 🇬🇧 London | 47,673 |  |
| 10 | [BAT](https://www.tamtam.ai/c/bat) (bat.com)<br>Global consumer goods company focused on transitioning adult smokers to scientifically substantiated reduced-risk smokeless alternatives across multiple international markets. | Manufacturing | 🇬🇧 London | 46,311 | 1902 |
| 11 | [BBC](https://www.tamtam.ai/c/bbc) (bbc.co.uk)<br>Leading public service broadcaster, creates impartial, independent, distinctive, world-class programmes and content; informs, educates, entertains millions globally. | Broadcast Media Production and Distribution | 🇬🇧 London | 42,697 | 1922 |
| 12 | [WPP](https://www.tamtam.ai/c/wpp) (wpp.com)<br>Creative transformation company uses creativity to build better futures for people, planet, clients, and communities | Advertising Services | 🇬🇧 London | 41,040 |  |
| 13 | [Rio Tinto](https://www.tamtam.ai/c/rio-tinto) (riotinto.com)<br>Provides essential materials including iron ore, low carbon aluminum, copper, borates, and titanium for various global industries and daily life. | Mining | 🇬🇧 London | 40,794 | 1873 |
| 14 | [Diageo](https://www.tamtam.ai/c/diageo) (diageo.com)<br>Global leader in premium drinks, with over 200 brands sold in 180 countries Committed to sustainability, innovation, and excellence worldwide | Beverage Manufacturing | 🇬🇧 London | 34,137 |  |
| 15 | [Rolls-Royce](https://www.tamtam.ai/c/rolls-royce) (rolls-royce.com)<br>Engineering excellence driving critical technologies for air, sea, and land, powering, protecting, and connecting people worldwide. | Industrial Machinery Manufacturing | 🇬🇧 London | 31,649 |  |
| 16 | [Intertek](https://www.tamtam.ai/c/intertek-london) (intertek.com)<br>A global provider of Total Quality Assurance solutions, offering Testing, Inspection, Certification services to industries worldwide through a vast network of labs and offices | International Trade and Development | 🇬🇧 London | 31,152 | 1885 |
| 17 | [UK Ministry of Defence](https://www.tamtam.ai/c/uk-ministry-of-defence) (gov.uk)<br>The company works to protect the security and interests of the United Kingdom, providing necessary training, equipment, and support for the Armed Forces | Defense and Space Manufacturing | 🇬🇧 London | 30,901 |  |
| 18 | [CHANEL](https://www.tamtam.ai/c/chanel) (chanel.com)<br>A global leader in luxury product creation, CHANEL offers a wide range of high-end fashion, accessories, fragrances, skincare, and more | Retail Luxury Goods and Jewelry | 🇬🇧 London | 30,431 |  |
| 19 | [Nothing](https://www.tamtam.ai/c/nothing-london) (nothing.tech)<br>London-based tech company building smartphones and audio equipment with iconic design and intuitive engineering as an alternative to established industry giants. | Technology, Information and Internet | 🇬🇧 London | 29,964 | 2020 |
| 20 | [Arup](https://www.tamtam.ai/c/arup) (arup.com)<br>A global collective of designers and consultants dedicated to sustainable development, collaborating with clients to shape a better world using technology and imagination | Design Services | 🇬🇧 London | 26,193 | 1946 |
| 21 | [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 |  |
| 22 | [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 |  |
| 23 | [UCL](https://www.tamtam.ai/c/ucl) (ucl.ac.uk)<br>Leading multidisciplinary university in London, promoting academic excellence, inclusive education, and impactful research addressing real-world challenges. | Research Services | 🇬🇧 London | 24,678 |  |
| 24 | [Entain](https://www.tamtam.ai/c/entain) (entaingroup.com)<br>A global sports betting and gaming entertainment group with over 25 brands, focused on revolutionizing the industry and promoting diversity | Entertainment Providers | 🇬🇧 London | 18,906 |  |
| 25 | [Haleon](https://www.tamtam.ai/c/haleon) (haleon.com)<br>The company is focused on improving everyday health through a human-centered approach They promote community guidelines for social media interactions #HelloHaleon | Consumer Services | 🇬🇧 London | 18,581 | 2022 |
| 26 | [Imperial College London](https://www.tamtam.ai/c/imperial-college-london) (imperial.ac.uk)<br>Leading university specializing in science, medicine, engineering, and business, fostering interdisciplinary collaboration to advance knowledge and improve health. | Research Services | 🇬🇧 London | 18,233 | 1907 |
| 27 | [National Grid](https://www.tamtam.ai/c/national-grid) (nationalgrid.com)<br>Operate and develop electricity transmission and distribution networks, natural gas systems, and invest in clean energy infrastructure and technology ventures. | Utilities | 🇬🇧 London | 17,432 |  |
| 28 | [Babcock International Group](https://www.tamtam.ai/c/babcock-international-group) (babcockinternational.com)<br>An international defence company providing product and service solutions to enhance customers' capabilities and assets, offering opportunities for professionals to grow | Defense and Space Manufacturing | 🇬🇧 London | 16,474 |  |
| 29 | [Hitachi Rail](https://www.tamtam.ai/c/hitachi-rail) (hitachirail.com)<br>Hitachi Rail provides innovative technology solutions for rail transportation, focusing on sustainability, digital transformation, and reducing carbon emissions globally | Rail Transportation | 🇬🇧 London | 15,527 |  |
| 30 | [Pearson](https://www.tamtam.ai/c/pearson-london) (pearson.com)<br>A global leader in learning, offering digital content, assessments, qualifications, and data to create vibrant and enriching learning experiences worldwide | Education | 🇬🇧 London | 13,596 |  |

## 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

- [The largest companies in London](https://www.tamtam.ai/l/largest-companies-london) (12,882)
- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
- [Financial Services companies in London](https://www.tamtam.ai/l/financial-services-companies-london) (1,862)
- [Financial services firms in London](https://www.tamtam.ai/l/financial-services-firms-london) (1,824)
- [SaaS companies in London](https://www.tamtam.ai/l/saas-companies-london) (1,615)
- [Professional services firms in London](https://www.tamtam.ai/l/professional-services-firms-london) (1,248)
- [Software Development companies in London](https://www.tamtam.ai/l/software-development-companies-london) (1,217)
- [Retail chains in London](https://www.tamtam.ai/l/retail-chains-london) (942)
- [IT Services and IT Consulting companies in London](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-london) (693)
- [Companies with a mobile app in London](https://www.tamtam.ai/l/companies-with-mobile-app-london) (667)
- [Consulting firms in London](https://www.tamtam.ai/l/consulting-firms-london) (648)
- [IT services companies in London](https://www.tamtam.ai/l/it-services-companies-london) (607)
- [Subscription businesses in London](https://www.tamtam.ai/l/subscription-businesses-london) (544)
- [Venture capital and private equity firms in London](https://www.tamtam.ai/l/vc-and-private-equity-firms-london) (539)
- [Marketing and communications agencies in London](https://www.tamtam.ai/l/marketing-agencies-london) (533)
- [Retail Apparel and Fashion companies in London](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-london) (498)
- [Advertising Services companies in London](https://www.tamtam.ai/l/advertising-services-companies-london) (480)
- [AI companies in London](https://www.tamtam.ai/l/ai-companies-london) (456)
- [Investment Management companies in London](https://www.tamtam.ai/l/investment-management-companies-london) (452)
- [Hotel and hospitality groups in London](https://www.tamtam.ai/l/hospitality-groups-london) (445)
- [Luxury brands in London](https://www.tamtam.ai/l/luxury-brands-london) (428)
- [AI-native companies in London](https://www.tamtam.ai/l/ai-native-companies-london) (407)
- [E-commerce companies in London](https://www.tamtam.ai/l/ecommerce-companies-london) (384)
- [Fintech companies in London](https://www.tamtam.ai/l/fintech-companies-london) (384)

## The same list elsewhere in United Kingdom

- [Companies with in-house R&D in the United Kingdom](https://www.tamtam.ai/l/r-and-d-companies-united-kingdom) (1,930)
- [Companies with in-house R&D in England](https://www.tamtam.ai/l/r-and-d-companies-england) (1,703)
- [Companies with in-house R&D in Scotland](https://www.tamtam.ai/l/r-and-d-companies-scotland) (94)
- [Companies with in-house R&D in Wales](https://www.tamtam.ai/l/r-and-d-companies-wales) (38)
- [Companies with in-house R&D in Northern Ireland](https://www.tamtam.ai/l/r-and-d-companies-northern-ireland) (28)
- [Companies with in-house R&D in Cambridge](https://www.tamtam.ai/l/r-and-d-companies-cambridge) (56)
- [Companies with in-house R&D in Oxford](https://www.tamtam.ai/l/r-and-d-companies-oxford) (39)
- [Companies with in-house R&D in Manchester](https://www.tamtam.ai/l/r-and-d-companies-manchester) (34)
- [Companies with in-house R&D in Nottingham](https://www.tamtam.ai/l/r-and-d-companies-nottingham) (27)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,169)

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Source: https://www.tamtam.ai/l/r-and-d-companies-london