The 100 largest companies in London (2026 list)

#	Company	Industry	Headquarters	Employees	Founded
1	EY ey.com A global organization with diverse teams in over 150 countries provides assurance, consulting, law, strategy, tax, and transactions to help clients grow and transform	Professional Services	🇬🇧 London	404,207	n/a
2	UK Civil Service gov.uk This company implements government policies, delivering essential public services in the UK	Government Administration	🇬🇧 London	238,504	n/a
3	Shell shell.com 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	n/a
4	HSBC hsbc.com A global financial services organization with a network spanning 63 countries, serving individuals, companies, and governments, creating opportunities for customers worldwide	Financial Services	🇬🇧 London	197,879	n/a
5	Vodafone vodafone.com 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
6	G4S g4s.com A leading security and facility services company providing proactive security services, cutting-edge technology, and integrated solutions to help clients focus on their core business	Security and Investigations	🇬🇧 London	116,486	1901
7	Aon aon.com The company provides advice and solutions to clients worldwide, helping them make better decisions to protect and grow their business	Financial Services	🇬🇧 London	93,574	n/a
8	ANY Company any.company Connect, promote, and find partners with a focus on building stronger connections and faster growth in the global marketplace Tailored solutions for businesses	IT Services and IT Consulting	🇬🇧 London	93,110	2018
9	GSK gsk.com Uniting science, technology, and talent to advance healthcare and disease prevention through collaborative innovation and community engagement.	Pharmaceutical Manufacturing	🇬🇧 London	92,092	n/a
10	bp bp.com 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
11	Barclays home.barclays A British universal bank with global presence, offering consumer banking, payments, corporate and investment banking services, supported by technology and operational solutions	Financial Services	🇬🇧 London	82,417	n/a
12	Kingfisher plc kingfisher.com 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	n/a
13	Standard Chartered sc.com An international banking group with a presence in 53 markets, driving commerce and prosperity through diversity and values Listed on London and Hong Kong Stock Exchanges	Banking	🇬🇧 London	79,401	n/a
14	BT Group bt.com A global communications services company connecting people through technology to address challenges like the pandemic, climate change, and cyber security	Telecommunications	🇬🇧 London	73,712	n/a
15	Sainsbury's sainsburys.jobs 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
16	NHS England england.nhs.uk This organization collaborates with NHS Improvement to enhance care delivery, transparency, and services for patients in England while prioritizing efficiency and accountability	Hospitals and Health Care	🇬🇧 London	59,120	2012
17	Lloyds Banking Group lloydsbankinggroup.com This company focuses on creating a more sustainable and inclusive future in the financial services industry, while supporting customers' changing needs	Financial Services	🇬🇧 London	57,702	n/a
18	WTW wtwco.com Offering data-driven solutions in people, risk, and capital areas, leveraging global expertise to enhance strategy, resilience, workforce motivation, and performance	Financial Services	🇬🇧 London	55,656	n/a
19	BAE Systems baesystems.com 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
20	FCA Fiat Chrysler Automobiles stellantis.com 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	n/a
21	BAT bat.com 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
22	Department for Education gov.uk Develop education, training, and social care policies, offer diverse job roles, flexible work, and community involvement opportunities across England.	Government Administration	🇬🇧 London	43,294	n/a
23	BBC bbc.co.uk 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
24	WPP wpp.com Creative transformation company uses creativity to build better futures for people, planet, clients, and communities	Advertising Services	🇬🇧 London	41,040	n/a
25	Rio Tinto riotinto.com 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
26	Marks and Spencer jobs.marksandspencer.com Global retailer delivering quality products through physical and digital channels while prioritizing innovation and value for millions of customers across the world.	Retail	🇬🇧 London	40,055	1884
27	Royal Mail linktr.ee Connecting businesses, customers, and communities in the UK by providing universal postal service to over 29 million addresses, aiming to be the best delivery company in Europe	Freight and Package Transportation	🇬🇧 London	39,215	n/a
28	RELX relx.com 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	n/a
29	John Lewis Partnership jlpjobs.com Employee-owned business operating department stores and supermarkets focused on quality service, retail innovation, and shared responsibility among partners for collective success and growth.	Retail	🇬🇧 London	36,517	n/a
30	Virgin virgin.com A global investment group with diverse companies in travel, health, entertainment, telecommunications, and space, focused on customer experience and sustainability.	Venture Capital and Private Equity Principals	🇬🇧 London	36,396	n/a
31	Aviva aviva.com This company prioritizes their people, striving to create an inclusive workplace with market-leading benefits for employees and a strong connection to customers and communities	Insurance	🇬🇧 London	36,000	1696
32	Diageo diageo.com 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	n/a
33	Department for Work and Pensions (DWP)gov.uk The company is responsible for welfare, pensions, child maintenance, and benefits, aiming to reduce poverty, promote work, and ensure financial security for all	Government Administration	🇬🇧 London	33,465	1948
34	Hays haysplc.com Specialist recruitment and workforce solutions provider offering advisory services, career transitions, and employer brand positioning, with a focus on empowering people and businesses to succeed globally	Staffing and Recruiting	🇬🇧 London	31,854	n/a
35	Rolls-Royce rolls-royce.com Engineering excellence driving critical technologies for air, sea, and land, powering, protecting, and connecting people worldwide.	Industrial Machinery Manufacturing	🇬🇧 London	31,649	n/a
36	Intertek intertek.com 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
37	UK Ministry of Defence gov.uk 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	n/a
38	CHANEL chanel.com 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	n/a
39	Nothing nothing.tech 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
40	HM Revenue & Customs gov.uk UK's tax, payments, and customs authority, collecting funds for public services, providing financial support, ensuring tax compliance, and combating fraudulent activities	Government Administration	🇬🇧 London	26,882	2005
41	Anglo American angloamerican.com Global mining company producing essential metals and minerals with a focus on sustainability, innovation, and community value creation.	Mining	🇬🇧 London	26,768	n/a
42	Arup arup.com 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
43	Capita capita.com A leading provider of business services using data, technology, and people to simplify connections between governments, citizens, businesses, and customers	IT Services and IT Consulting	🇬🇧 London	25,581	1984
44	LSEG lseg.com Provides financial indexing, benchmarking, analytic services, technology solutions, and integrated market infrastructure across data, capital markets, and post-trade.	Financial Services	🇬🇧 London	25,298	n/a
45	Balfour Beatty plc balfourbeatty.com A global infrastructure group with 25,000 employees delivering innovative and efficient transportation, power, building, and utility systems for economic growth and community support	Construction	🇬🇧 London	25,000	1909
46	Edutech artbees.co.uk A London-based company is an official Google for Education Partner, offering implementation, configuration, training, and support for Chromebooks and G Suite	Software Development	🇬🇧 London	24,990	n/a
47	Kantar kantar.com 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	n/a
48	UCL ucl.ac.uk Leading multidisciplinary university in London, promoting academic excellence, inclusive education, and impactful research addressing real-world challenges.	Research Services	🇬🇧 London	24,678	n/a
49	Mott MacDonald mottmac.com The company focuses on improving society through digital innovation, excellence, and solving intricate challenges with clients to deliver better outcomes	Civil Engineering	🇬🇧 London	24,653	1989
50	British Council britishcouncil.org Building global connections through arts, education, English language learning, and qualifications to empower individuals and foster international understanding.	Non-profit Organizations	🇬🇧 London	24,510	1934
51	Department for Culture, Media and Sport civil-service-careers.gov.uk Supporting culture, arts, media, sport, tourism, and civil society in England, championing sports and cultural industries, enhancing community cohesiveness Governed by the Department for Culture, Media and Sport	Government Administration	🇬🇧 London	24,000	n/a
52	Santander UK santander.co.uk Providing personal and commercial financial products and services to millions of customers, fostering diversity and a positive workplace culture.	Banking	🇬🇧 London	21,000	n/a
53	VOIS voiscentre.com Global strategic arm of Vodafone, creating value and efficiency across 28 countries through talent, technology, and transformation for business outcomes	IT Services and IT Consulting	🇬🇧 London	20,863	n/a
54	King's College London kcl.ac.uk Top-ranked university offering world-class education and research, fostering innovation and positive societal impact globally and locally.	Research Services	🇬🇧 London	20,705	n/a
55	Ministry of Justice UK gov.uk Government department responsible for justice system administration, legal affairs, courts, prisons, and public safety in the United Kingdom.	Government Administration	🇬🇧 London	20,603	2007
56	Bupa UK bupa.co.uk International healthcare company dedicated to helping people live longer, healthier, happier lives by providing quality healthcare services to over 38 million customers worldwide	Hospitals and Health Care	🇬🇧 London	20,537	1947
57	World Vision wvi.org A global humanitarian organization dedicated to improving the lives of children and families by addressing root causes of poverty worldwide	Non-profit Organizations	🇬🇧 London	19,419	1950
58	Mitie mitie.com Offers various specialist services like security, engineering, cleaning, landscaping, energy, property consultancy, maintenance, and custody support. Takes care of customer people and buildings.	Facilities Services	🇬🇧 London	19,246	1987
59	Clinic clinic.co.uk Independent creative agency crafting bold ideas to drive action and change, with a focus on people's experiences and problem-solving for brands	Advertising Services	🇬🇧 London	19,192	1983
60	Entain entaingroup.com 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	n/a
61	Costa Coffee costa.co.uk Global coffee brand offering stores, ready-to-drink products, self-serve machines, and home options, focusing on community and growth.	Retail	🇬🇧 London	18,739	1971
62	Menzies Aviation menziesaviation.com Providing ground handling, air cargo, and fueling services worldwide, ensuring safety, precision, and continuous support in aviation operations.	Airlines and Aviation	🇬🇧 London	18,695	1833
63	Transport for London tfl.gov.uk London-based transportation company leading in providing diverse travel options, focusing on customer feedback, technology innovation, and large-scale investments for city-wide mobility improvements	Non-profit Organizations	🇬🇧 London	18,658	2000
64	Haleon haleon.com 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
65	EY-Parthenon ey.com Multidisciplinary professionals across 120 countries provide actionable corporate, transaction, and turnaround strategies to clients using data analytics and digital capabilities	Business Consulting and Services	🇬🇧 London	18,536	n/a
66	Revolut revolut.com A fintech company on a mission to provide customers with more visibility, control, and freedom over their money through innovative products	Financial Services	🇬🇧 London	18,462	2015
67	Imperial College London imperial.ac.uk Leading university specializing in science, medicine, engineering, and business, fostering interdisciplinary collaboration to advance knowledge and improve health.	Research Services	🇬🇧 London	18,233	1907
68	UK Home Office gov.uk The company works on issues related to drug use, alcohol policy, terrorism, crime prevention, border control, immigration, policing, and fire prevention and rescue	Government Administration	🇬🇧 London	17,613	1782
69	National Grid nationalgrid.com Operate and develop electricity transmission and distribution networks, natural gas systems, and invest in clean energy infrastructure and technology ventures.	Utilities	🇬🇧 London	17,432	n/a
70	Save the Children International savethechildren.net Support children's survival, protection, development, and participation worldwide through programs, campaigns, and partnerships in 120 countries.	Non-profit Organizations	🇬🇧 London	17,356	1919
71	Post Office Ltd postoffice.co.uk operates largest UK retail network with 11,500 branches and a major digital presence, focusing on customer service and innovation	Retail	🇬🇧 London	17,058	n/a
72	Openreach openreach.com This company is the UK's digital network business, connecting homes, businesses, and more to the world with a focus on high-quality service	Telecommunications	🇬🇧 London	16,885	n/a
73	Frasers Group frasers.group Operate multiple iconic retail brands across various sectors, innovating and expanding to create future-proof shopping experiences worldwide.	Retail	🇬🇧 London	16,785	1982
74	Babcock International Group babcockinternational.com 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	n/a
75	Vedanta Group vedantalimited.com A global company in mining and metallurgy sectors, focusing on developing talent, empowering communities, and sustainable development initiatives for stakeholders worldwide	Manufacturing	🇬🇧 London	15,712	1976
76	Hitachi Rail hitachirail.com Hitachi Rail provides innovative technology solutions for rail transportation, focusing on sustainability, digital transformation, and reducing carbon emissions globally	Rail Transportation	🇬🇧 London	15,527	n/a
77	Clear Channel Europe clearchanneleurope.com Leading outdoor media company across 14 markets, transforming advertising through data-driven innovations and infrastructure for brands and positive global impact.	Advertising Services	🇬🇧 London	15,206	n/a
78	Pharma Solutions Hub marketinglo.com Specialized pharmaceutical marketing agency helping companies increase visibility, engagement, and leads through media planning, buying, strategy, PPC, creative, web design, content, and inbound marketing services	Software Development	🇬🇧 London	15,120	n/a
79	KPMG UK kpmg.com A leading UK provider of tax, audit, and advisory services with a global presence, focusing on innovative solutions and expertise for clients' needs	Business Consulting and Services	🇬🇧 London	15,102	1987
80	Howden howdengroupholdings.com Employee-owned insurance group specializing in broking, reinsurance, underwriting, risk consultancy, and employee benefits with global expertise.	Insurance	🇬🇧 London	15,000	1994
81	Petrofac petrofac.com International energy service provider specializing in designing, building, managing, and maintaining oil, gas, refining, and renewable energy infrastructure for leading energy companies worldwide	Engineering Services	🇬🇧 London	14,616	1981
82	Cloud Consulting ccltng.com Oversees national education policies, youth programs, and administration to support learning and development across France.	IT Services and IT Consulting	🇬🇧 London	14,588	n/a
83	Lidl GB careers.lidl.co.uk Retail grocery stores across the UK offering high-quality products at low prices, supported by extensive distribution and dedicated staff.	Retail	🇬🇧 London	14,526	1994
84	local me.uk A social networking platform connecting entrepreneurs and creatives worldwide to build relationships, collaborate, and make a positive impact on the community	Social Networking Platforms	🇬🇧 London	13,968	2017
85	Savills savills.com Global real estate advisory firm providing tailored solutions and expert advice for residential and commercial property clients worldwide.	Real Estate	🇬🇧 London	13,891	n/a
86	OCS ocs.com Facilities management company offering cleaning, catering, security, technical, energy, landscaping, logistics, waste, pest control services across UK and Ireland.	Facilities Services	🇬🇧 London	13,642	1900
87	Pearson pearson.com A global leader in learning, offering digital content, assessments, qualifications, and data to create vibrant and enriching learning experiences worldwide	Education	🇬🇧 London	13,596	n/a
88	Subsea7 subsea7.com Provides offshore services supporting lower-carbon oil and gas evolution, renewable energy growth, and emerging energy solutions for energy transition.	Oil and Gas	🇬🇧 London	13,582	2002
89	Smollan smollan.com Partners with brands and retailers, building solutions that drive growth and create opportunities at the point of purchase.	Retail	🇬🇧 London	13,502	1931
90	DLA Piper dlapiper.com Global law firm providing innovative legal services, managing cross-border projects, transactions, disputes, and supporting business growth worldwide.	Law Practice	🇬🇧 London	13,449	2005
91	DS Smith dssmith.com Innovative packaging solutions, paper products and recycling services using renewable resources to minimize environmental impact while optimizing supply chains for increased profitability.	Manufacturing	🇬🇧 London	13,157	n/a
92	HM Prison and Probation Service gov.uk An executive agency of the Ministry of Justice, HM Prison and Probation Service ensures court sentences are served in prisons and communities, supporting positive changes for offenders	Government Administration	🇬🇧 London	12,547	n/a
93	Independent Consultant chasedimond.com Provides expert advice and specialized services to various clients on a contract basis, operating independently without affiliation to a larger firm.	IT Services and IT Consulting	🇬🇧 London	12,534	n/a
94	John Lewis & Partners jlpjobs.com Aiming to create a happier and more trusted way of doing business, this company emphasizes partnership to make a difference	Retail	🇬🇧 London	12,437	1864
95	End Antisemitism stophate.uk A community fighting against antisemitism through education, challenging stereotypes, and advocating for policies to protect Jewish people from discrimination and violence	Civic and Social Organizations	🇬🇧 London	12,427	n/a
96	EE ee.co.uk A leading mobile communications company in the UK, offering mobile and fixed services with the largest and fastest network coverage	Telecommunications	🇬🇧 London	12,146	2012
97	INEOS ineos.com Global manufacturer of raw materials and energy producer striving to reduce carbon emissions, create sustainable products, and improve living standards worldwide	Chemical Manufacturing	🇬🇧 London	12,070	1998
98	EssenceMediacom essencemediacom.com EssenceMediacom is a leading agency focused on delivering marketing breakthroughs for brands through integrated media solutions and continuous learning	Advertising Services	🇬🇧 London	12,000	2023
99	Wise wise.com Platform enabling individuals and businesses to hold multiple currencies, transfer money internationally, and spend abroad with low fees.	Financial Services	🇬🇧 London	11,769	2011
100	Guy's and St Thomas' NHS Foundation Trust guysandstthomas.nhs.uk Provides high-quality healthcare services, clinical excellence, research, and community care through multiple hospitals and partnerships in London.	Hospitals and Health Care	🇬🇧 London	11,655	n/a

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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 Oct 9, 2026.

The 100 largest companies in London

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