# The 30 largest law firms in London

Tamtam tracks 121 law firms headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by RELX, KPMG UK and Clifford Chance. Their median headcount is 3,391. Half of them were founded in 1915 or later.

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.

🇬🇧 London · 30 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [RELX](https://www.tamtam.ai/c/relx) (relx.com)<br>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 |  |
| 2 | [KPMG UK](https://www.tamtam.ai/c/kpmg-uk) (kpmg.com)<br>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 |
| 3 | [Clifford Chance](https://www.tamtam.ai/c/clifford-chance) (cliffordchance.com)<br>A global law firm providing high-quality legal advice to a diverse range of clients, including corporations, governments, regulators, and non-profit organizations worldwide | Law Practice | 🇬🇧 London | 8,435 | 1987 |
| 4 | [Clyde & Co](https://www.tamtam.ai/c/clyde-and-co) (clydeco.com)<br>A global law firm specializing in insurance, transport, infrastructure, energy, and trade Committed to diversity, community support, and environmental sustainability | Law Practice | 🇬🇧 London | 7,472 | 1933 |
| 5 | [Linklaters](https://www.tamtam.ai/c/linklaters) (linklaters.com)<br>It is a global law firm providing legal expertise and innovative solutions to clients navigating complex markets and regulatory environments. | Law Practice | 🇬🇧 London | 7,110 |  |
| 6 | [Freshfields](https://www.tamtam.ai/c/freshfields) (freshfields.com)<br>Global law firm supporting leading corporations, financial institutions, and governments on ground-breaking mandates worldwide through 2,800+ lawyers in multiple offices | Law Practice | 🇬🇧 London | 6,920 | 1743 |
| 7 | [Eversheds Sutherland](https://www.tamtam.ai/c/eversheds-sutherland) (eversheds-sutherland.com)<br>Global law practice offering high quality, innovative solutions for diverse clients worldwide, specializing in complex business issues with a people-focused approach | Law Practice | 🇬🇧 London | 6,217 |  |
| 8 | [Vialto](https://www.tamtam.ai/c/vialto) (vialtopartners.com)<br>Global mobility ecosystem transformation through tax, immigration, compensation, and work strategy solutions for multinational organizations in 150+ countries | Business Consulting and Services | 🇬🇧 London | 5,717 |  |
| 9 | [Ashurst](https://www.tamtam.ai/c/ashurst) (ashurst.com)<br>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. | Law Practice | 🇬🇧 London | 5,236 |  |
| 10 | [Advocate](https://www.tamtam.ai/c/advocate) (weareadvocate.org.uk)<br>A charity connecting individuals and organizations in need with pro bono legal assistance from volunteer barristers across England and Wales | Legal Services | 🇬🇧 London | 4,917 | 1996 |
| 11 | [DWF](https://www.tamtam.ai/c/dwf) (dwfgroup.com)<br>Global provider of integrated legal and business services across various sectors, offering bespoke solutions for clients with efficiency, price certainty, and transparency | Law Practice | 🇬🇧 London | 4,848 | 1977 |
| 12 | [Pinsent Masons](https://www.tamtam.ai/c/pinsent-masons) (pinsentmasons.com)<br>Multinational professional services firm, legal foundation, diverse skill sets, technology, processes, competitive advantage clients, business-critical advice complex regulatory environments. | Law Practice | 🇬🇧 London | 4,403 |  |
| 13 | [Moore Global](https://www.tamtam.ai/c/moore-global) (moore-global.com)<br>Global accounting and advisory firm with over 37,000 professionals in 114 countries, dedicated to helping clients thrive through expert guidance and support | Accounting | 🇬🇧 London | 3,884 | 1907 |
| 14 | [London Commercial Solicitors](https://www.tamtam.ai/c/london-commercial-solicitors)<br>Specialized team of lawyers offering comprehensive and personalized legal services to businesses and individuals, with a focus on achieving expectations and solving legal issues | Law Practice | 🇬🇧 London | 3,778 |  |
| 15 | [Addleshaw Goddard](https://www.tamtam.ai/c/addleshaw-goddard) (addleshawgoddard.com)<br>Providing comprehensive legal advice and solutions across over 50 business law areas to clients in more than 100 countries worldwide. | Law Practice | 🇬🇧 London | 3,391 | 1775 |
| 16 | [Bird & Bird](https://www.tamtam.ai/c/bird-and-bird) (twobirds.com)<br>Providing legal services worldwide with expertise in technology and digital transformation, supporting clients across multiple industries and regions. | Law Practice | 🇬🇧 London | 3,196 | 1846 |
| 17 | [DAC Beachcroft](https://www.tamtam.ai/c/dac-beachcroft) (dacbeachcroft.com)<br>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. | Law Practice | 🇬🇧 London | 3,183 |  |
| 18 | [CMS UK](https://www.tamtam.ai/c/cms-uk) (cms.law)<br>Providing expert legal advice worldwide through a network of independent law firms, combining local knowledge with global strategic insight. | Law Practice | 🇬🇧 London | 3,160 |  |
| 19 | [Kennedys](https://www.tamtam.ai/c/kennedys) (kennedyslaw.com)<br>Global law firm specializing in litigation, insurance, and liability sectors with expertise in advisory services Operates worldwide with a focus on regulatory impact | Law Practice | 🇬🇧 London | 3,028 | 1899 |
| 20 | [Simmons & Simmons](https://www.tamtam.ai/c/simmons-and-simmons) (simmons-simmons.com)<br>Legal services for regulated sectors including finance, energy, healthcare, and technology, focusing on business partnership and efficient solutions. | Law Practice | 🇬🇧 London | 2,921 |  |
| 21 | [Government Legal Department](https://www.tamtam.ai/c/government-legal-department) (gov.uk)<br>This company provides legal advice to the government, represents them in court, and administers estates of people who die intestate in England and Wales | Legal Services | 🇬🇧 London | 2,708 | 2015 |
| 22 | [Herbert Smith Freehills](https://www.tamtam.ai/c/herbert-smith-freehills) (hsfkramer.com)<br>Global law firm providing comprehensive legal services across multiple sectors, focusing on client solutions and international expertise. | Law Practice | 🇬🇧 London | 2,491 | 2012 |
| 23 | [Osborne Clarke](https://www.tamtam.ai/c/osborne-clarke) (osborneclarke.com)<br>Provide commercial legal advice and services across sectors, focusing on client success amid digital, economic, and environmental challenges worldwide. | Law Practice | 🇬🇧 London | 2,480 | 1748 |
| 24 | [Fieldfisher](https://www.tamtam.ai/c/fieldfisher) (fieldfisher.com)<br>European law firm specializing in energy, technology, financial services, and life sciences Offers commercial advice with expert dispute resolution lawyers across 25 international offices | Legal Services | 🇬🇧 London | 2,295 | 1989 |
| 25 | [Slaughter and May](https://www.tamtam.ai/c/slaughter-and-may) (slaughterandmay.com)<br>A prestigious law firm advising on international transactions, with expertise in M&A, corporate law, financing, tax, competition, dispute resolution, real estate, and more | Law Practice | 🇬🇧 London | 2,086 | 1889 |
| 26 | [Chartered Institute of Arbitrators (Ciarb)](https://www.tamtam.ai/c/chartered-institute-of-arbitrators-ciarb) (ciarb.org)<br>A charitable organization promoting effective resolution of disputes worldwide through arbitration, mediation, and adjudication with a focus on empowering best practices | Alternative Dispute Resolution | 🇬🇧 London | 2,006 | 1915 |
| 27 | [Corsearch](https://www.tamtam.ai/c/corsearch) (corsearch.com)<br>Revolutionizing brand protection with AI-powered solutions, trademark research, and IP protection services to help companies secure, monitor, and enforce their brands globally | Information Services | 🇬🇧 London | 1,868 |  |
| 28 | [HFW](https://www.tamtam.ai/c/hfw) (hfw.com)<br>Global law firm specializing in aerospace, commodities, construction, energy, insurance, and shipping sectors with over 600 lawyers across offices worldwide | Law Practice | 🇬🇧 London | 1,861 | 1883 |
| 29 | [Shoosmiths](https://www.tamtam.ai/c/shoosmiths) (shoosmiths.com)<br>A leading law firm in the UK and Brussels, known for exceptional service, innovative solutions, and commitment to ESG and community support | Law Practice | 🇬🇧 London | 1,596 | 1845 |
| 30 | [Ampa - Legal & Professional Services](https://www.tamtam.ai/c/ampa-legal-and-professional-services) (ampa.co.uk)<br>Ampa is a group of legal and professional services companies in the UK, dedicated to unlocking potential for individuals and businesses | Law Practice | 🇬🇧 London | 1,565 |  |

## 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](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)
- [Companies with in-house R&D in London](https://www.tamtam.ai/l/r-and-d-companies-london) (477)
- [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)

## The same list elsewhere in United Kingdom

- [Law firms in the United Kingdom](https://www.tamtam.ai/l/law-firms-united-kingdom) (292)
- [Law firms in England](https://www.tamtam.ai/l/law-firms-england) (257)

## The same list elsewhere

- [Law firms in the world](https://www.tamtam.ai/l/law-firms-in-the-world) (3,223)
- [Law firms in Europe](https://www.tamtam.ai/l/law-firms-in-europe) (1,618)

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Source: https://www.tamtam.ai/l/law-firms-london