This selection of large companies in London shows a concentration of law firms and professional services. Companies such as Clifford Chance, Clyde & Co, Linklaters, and Freshfields provide legal advice and services across various sectors. Other firms like KPMG UK and Vialto offer business consulting, tax, and advisory solutions.
A notable pattern among these London-based firms is their global reach, often serving multinational organizations and operating in numerous countries. Many of the featured law firms were established in the late 20th century, with a few, like Freshfields and Addleshaw Goddard, tracing their origins back to the 18th century.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 37,600 | ||||
| 2 | 15,102 | ||||
| 3 |
Clifford Chancecliffordchance.com
A global law firm providing high-quality legal advice to a diverse range of clients, including corporations, governments, regulators, and non-profit organizations worldwide |
8,435 | |||
| 4 |
Clyde & Coclydeco.com
A global law firm specializing in insurance, transport, infrastructure, energy, and trade Committed to diversity, community support, and environmental sustainability |
7,472 | |||
| 5 |
Linklaterslinklaters.com
It is a global law firm providing legal expertise and innovative solutions to clients navigating complex markets and regulatory environments. |
7,110 | |||
| 6 |
Freshfieldsfreshfields.com
Global law firm supporting leading corporations, financial institutions, and governments on ground-breaking mandates worldwide through 2,800+ lawyers in multiple offices |
6,920 | |||
| 7 |
Eversheds Sutherlandeversheds-sutherland.com
Global law practice offering high quality, innovative solutions for diverse clients worldwide, specializing in complex business issues with a people-focused approach |
6,217 | |||
| 8 |
Vialtovialtopartners.com
Global mobility ecosystem transformation through tax, immigration, compensation, and work strategy solutions for multinational organizations in 150+ countries |
5,717 | |||
| 9 |
Ashurstashurst.com
Leading global law firm offering legal, risk consulting, and NewLaw services. Manages complex multi-jurisdictional transactions, disputes, and projects for corporates, financial institutions, and governments. |
5,236 | |||
| 10 |
Advocateweareadvocate.org.uk
A charity connecting individuals and organizations in need with pro bono legal assistance from volunteer barristers across England and Wales |
4,917 | |||
| 11 |
DWFdwfgroup.com
Global provider of integrated legal and business services across various sectors, offering bespoke solutions for clients with efficiency, price certainty, and transparency |
4,848 | |||
| 12 |
Pinsent Masonspinsentmasons.com
Multinational professional services firm, legal foundation, diverse skill sets, technology, processes, competitive advantage clients, business-critical advice complex regulatory environments. |
4,403 | |||
| 13 |
Moore Globalmoore-global.com
Global accounting and advisory firm with over 37,000 professionals in 114 countries, dedicated to helping clients thrive through expert guidance and support |
3,884 | |||
| 14 | 
London Commercial Solicitors
Specialized team of lawyers offering comprehensive and personalized legal services to businesses and individuals, with a focus on achieving expectations and solving legal issues |
3,778 | |||
| 15 |
Addleshaw Goddardaddleshawgoddard.com
Providing comprehensive legal advice and solutions across over 50 business law areas to clients in more than 100 countries worldwide. |
3,391 | |||
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 |
Bird & Birdtwobirds.com
Providing legal services worldwide with expertise in technology and digital transformation, supporting clients across multiple industries and regions. |
3,196 | |||
| 17 |
DAC Beachcroftdacbeachcroft.com
Leading international legal business, partnering with clients for sustainable growth, defending their business and reputation with tailored commercial, transactional, claims, risk, and advisory legal services. |
3,183 | |||
| 18 | 3,160 | ||||
| 19 |
Kennedyskennedyslaw.com
Global law firm specializing in litigation, insurance, and liability sectors with expertise in advisory services Operates worldwide with a focus on regulatory impact |
3,028 | |||
| 20 |
Simmons & Simmonssimmons-simmons.com
Legal services for regulated sectors including finance, energy, healthcare, and technology, focusing on business partnership and efficient solutions. |
2,921 | |||
| 21 |
Government Legal Departmentgov.uk
This company provides legal advice to the government, represents them in court, and administers estates of people who die intestate in England and Wales |
2,708 | |||
| 22 |
Herbert Smith Freehillshsfkramer.com
Global law firm providing comprehensive legal services across multiple sectors, focusing on client solutions and international expertise. |
2,491 | |||
| 23 |
Osborne Clarkeosborneclarke.com
Provide commercial legal advice and services across sectors, focusing on client success amid digital, economic, and environmental challenges worldwide. |
2,480 | |||
| 24 |
Fieldfisherfieldfisher.com
European law firm specializing in energy, technology, financial services, and life sciences Offers commercial advice with expert dispute resolution lawyers across 25 international offices |
2,295 | |||
| 25 |
Slaughter and Mayslaughterandmay.com
A prestigious law firm advising on international transactions, with expertise in M&A, corporate law, financing, tax, competition, dispute resolution, real estate, and more |
2,086 | |||
| 26 |
Chartered Institute of Arbitrators (Ciarb)ciarb.org
A charitable organization promoting effective resolution of disputes worldwide through arbitration, mediation, and adjudication with a focus on empowering best practices |
2,006 | |||
| 27 |
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 | |||
| 28 | 1,861 | ||||
| 29 |
Shoosmithsshoosmiths.com
A leading law firm in the UK and Brussels, known for exceptional service, innovative solutions, and commitment to ESG and community support |
1,596 | |||
| 30 |
Ampa - Legal & Professional Servicesampa.co.uk
Ampa is a group of legal and professional services companies in the UK, dedicated to unlocking potential for individuals and businesses |
1,565 | |||
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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 13, 2026.
More company lists in London
- The largest companies in London 12,882
- Multinational companies in London 3,652
- Financial Services companies in London 1,862
- Financial services firms in London 1,824
- SaaS companies in London 1,615
- Professional services firms in London 1,248
- Software Development companies in London 1,217
- Retail chains in London 942
- IT Services and IT Consulting companies in London 693
- Companies with a mobile app in London 667
- Consulting firms in London 648
- IT services companies in London 607
- Subscription businesses in London 544
- Venture capital and private equity firms in London 539
- Marketing and communications agencies in London 533
- Retail Apparel and Fashion companies in London 498
- Advertising Services companies in London 480
- Companies with in-house R&D in London 477
- AI companies in London 456
- Investment Management companies in London 452
- Hotel and hospitality groups in London 445
- Luxury brands in London 428
- AI-native companies in London 407
- E-commerce companies in London 384
The same list elsewhere in United Kingdom
The same list elsewhere
- Law firms in the world 3,223
- Law firms in Europe 1,618