Company lists · Data refreshed September 2026

Top 25 Big 4 law firms based in London, United Kingdom

Name: Big 4 law firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 435 companies tracked

RevenueBase identified 435 big 4 law firms headquartered in London, United Kingdom as of September 2026 and tracks 103,855 professional contacts across them, including 53,263 with verified work emails. London is the largest hub.

This list covers big 4 law firms headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 23, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase Smart Search rating on every row Refreshed Sep 23, 2026 86% judged on-target in blind review

435Companies

103,855Contacts tracked

53,263Verified emails

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The 25 largest big 4 law firms based in London, United Kingdom

Ranked by team size

Top 25 of 435 big 4 law firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to big 4 law firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Clifford Chance	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	7,673 contacts →
	Partial evidence “We are a global law firm dedicated to creating advantage for our clients.” Source: RevenueBase Database · checked Sep 23, 2026
2	Linklaters	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	6,805 contacts →
	Partial evidence “Linklaters is a leading global law firm, supporting and investing in the future of our clients wherever they do business.” Source: RevenueBase Database · checked Sep 23, 2026
3	Freshfields	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	6,487 contacts →
	Partial evidence “Freshfields is a global firm with over 280 years’ experience of anticipating change, setting new standards and shaping the future of law.” Source: RevenueBase Database · checked Sep 23, 2026
4	Ashurst	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	4,611 contacts →
	Indirect evidence “Ashurst has combined with Perkins Coie to form Ashurst Perkins Coie.” Source: RevenueBase Database · checked Sep 23, 2026
5	Eversheds Sutherland	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	5,001-10,000	3,981 contacts →
	Partial evidence “A pioneering global law practice, we provide high quality legal advice and innovation worldwide.” Source: RevenueBase Database · checked Sep 23, 2026
6	Pinsent Masons	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	3,870 contacts →
	Indirect evidence “Pinsent Masons is a multinational professional services business with a robust legal foundation, operating with a clear purpose-led strategy.” Source: RevenueBase Database · checked Sep 23, 2026
7	Bird & Bird	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	3,187 contacts →
	Partial evidence “Bird & Bird is an international law firm with a focus on helping organisations being changed by technology and the digital world.” Source: RevenueBase Database · checked Sep 23, 2026
8	Addleshaw Goddard	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	3,097 contacts →
	Indirect evidence “Welcome to Addleshaw Goddard (AG).” Source: RevenueBase Database · checked Sep 23, 2026
9	Simmons & Simmons	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	2,498 contacts →
	Partial evidence “An international law firm that acts like your business partner.” Source: RevenueBase Database · checked Sep 23, 2026
10	Mcguirewoods LLP	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	2,170 contacts →
	Partial evidence “McGuireWoods, one of the world’s leading law firms, has earned the loyalty of its many longstanding clients with deep and broad legal experience; a passion for understanding their…” Source: RevenueBase Database · checked Sep 23, 2026
11	Slaughter And MAY	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,951 contacts →
	Partial evidence “Slaughter and May is regarded as one of the most prestigious law firms in the world.” Source: RevenueBase Database · checked Sep 23, 2026
12	Fieldfisher	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,940 contacts →
	Partial evidence “Fieldfisher is an enterprising European law firm built around people.” Source: RevenueBase Database · checked Sep 23, 2026
13	Stephenson Harwood LLP	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,474 contacts →
	Partial evidence “Stephenson Harwood is an international law firm, and we're committed to creating 'positive partnerships' with our clients.” Source: RevenueBase Database · checked Sep 23, 2026
14	Shoosmiths	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,444 contacts →
	Partial evidence “We’re the law firm clients choose for excellent service, incisive thinking and above all for our ability to focus on what matters.” Source: RevenueBase Database · checked Sep 23, 2026
15	HFW	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,406 contacts →
	Partial evidence “HFW is a leading global law firm in the aerospace, commodities, construction, energy, insurance, and shipping sectors.” Source: RevenueBase Database · checked Sep 23, 2026
16	Mishcon DE Reya LLP	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,376 contacts →
	Indirect evidence “Based in London, Mishcon de Reya services an international community of clients and provides advice in situations where the constraints of geography often do not apply.” Source: RevenueBase Database · checked Sep 23, 2026
17	Mills & Reeve	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,353 contacts →
	Indirect evidence “At Mills & Reeve, our 1,450 plus people and over 850 lawyers share one vision – achieve more together.” Source: RevenueBase Database · checked Sep 23, 2026
18	RPC	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,216 contacts →
	Partial evidence “RPC is a law firm invested in you, your ambitions and your commercial success.” Source: RevenueBase Database · checked Sep 23, 2026
19	Taylor Rose	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,155 contacts →
	Partial evidence “Taylor Rose is a top 60 independent law firm with 1,700 experts operating nationwide and is recommended by the Legal 500 UK.” Source: RevenueBase Database · checked Sep 23, 2026
20	Trowers & Hamlins	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	1,113 contacts →
	Indirect evidence “Trowers & Hamlins is well known for its eclectic mix of specialisations combining sector leadership in the UK and across the Middle East and Asia.” Source: RevenueBase Database · checked Sep 23, 2026
21	Macfarlanes	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	1,007 contacts →
	Partial evidence “Macfarlanes is a pre-eminent law firm that serves a global client base in Private Capital, Private Wealth, M&A and Disputes.” Source: RevenueBase Database · checked Sep 23, 2026
22	Withersworldwide	Indirect evidence	London, United Kingdom	1,001-5,000	910 contacts →
	Indirect evidence “For the past 125 years we have been proud to assist some of the world's most remarkable individuals and organisations in realising their ambitions and using private capital to…” Source: RevenueBase Database · checked Sep 23, 2026
23	Lewis Silkin	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	794 contacts →
	Indirect evidence “We do things differently.” Source: RevenueBase Database · checked Sep 23, 2026
24	Farrer & CO	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	693 contacts →
	Indirect evidence “Farrer & Co is synonymous with the highest quality legal advice and service.” Source: RevenueBase Database · checked Sep 23, 2026
25	Kingsley Napley	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	560 contacts →
	Partial evidence “Kingsley Napley is an independent, internationally recognised London law firm, trusted by individuals, businesses and organisations to discreetly handle complex, high-profile, and…” Source: RevenueBase Database · checked Sep 23, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: big 4 law firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names big 4 law firms.
Partial evidence: Its own public description names part of big 4 law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name big 4 law firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 435 big 4 law firms based in London, United Kingdom

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Big 4 law firms based in London, United Kingdom at a glance

As of Sep 23, 2026

51.3%Verified-email coverage

238.7Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

132

11-50

162

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 435 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among big 4 law firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “big 4 law firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names big 4 law firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among big 4 law firms, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 53,263 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 23, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Big 4 law firms by metro in the United Kingdom

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names big 4 law firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many big 4 law firms are there based in London, United Kingdom?

RevenueBase identified 435 big 4 law firms headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Clifford Chance, headquartered in London, tops this list with the largest team on record.

Which city has the most big 4 law firms?

London leads with 435 headquartered companies, followed by Manchester (46) and Birmingham (28).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 53,263 verified decision-maker contacts tracked across these 435 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 23, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.