Company lists · Data refreshed September 2026

Top 25 Infrastructure investment law firms based in London, United Kingdom

Name: Infrastructure investment 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 28, 2026 247 companies tracked

RevenueBase identified 247 infrastructure investment law firms headquartered in London, United Kingdom as of September 2026 and tracks 9,777 professional contacts across them, including 5,316 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers infrastructure investment 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 28, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

247Companies

9,777Contacts tracked

5,316Verified emails

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The 25 largest infrastructure investment law firms based in London, United Kingdom

Ranked by team size

Top 25 of 247 infrastructure investment law firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to infrastructure investment 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	Slaughter And MAY	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
2	Mishcon DE Reya LLP	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
3	Watson Farley & Williams	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,331 contacts →
	Strong evidence “Watson Farley & Williams is a leading international law firm advising clients operating in the energy, infrastructure and transport sectors.” Source: RevenueBase Database · checked Sep 28, 2026
4	Trowers & Hamlins	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
5	Winckworth Sherwood LLP	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	360 contacts →
	Partial evidence “A full service law firm with a diverse client base, Winckworth Sherwood prides itself on providing market leading advice across a broad range of sectors and markets.” Source: RevenueBase Database · checked Sep 28, 2026
6	Bristows	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	354 contacts →
	Indirect evidence “We are a European headquartered hub for litigation, transactions and advice throughout the world and have remained fiercely independent since we first began in 1837.” Source: RevenueBase Database · checked Sep 28, 2026
7	FOX Williams	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	223 contacts →
	Partial evidence “Fox Williams is a leading law firm based in the City of London, trusted by its clients to provide quality advice with a high level of partner involvement and an astute commercial…” Source: RevenueBase Database · checked Sep 28, 2026
8	Beale & CO	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	205 contacts →
	Partial evidence “Originally founded in 1838 we have over 180 years’ experience providing specialist legal advice to the construction, engineering, infrastructure and insurance sectors.” Source: RevenueBase Database · checked Sep 28, 2026
9	Igneo Infrastructure Partners	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	117 contacts →
	Strong evidence “Sustainable Value Creation Through Partnership We seek to deliver sustainable returns through investment in mature, stable, infrastructure businesses.” Source: RevenueBase Database · checked Sep 28, 2026
10	Marriott Harrison	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	114 contacts →
	Indirect evidence “Marriott Harrison is a legal transactional and advisory firm, best known for its market-leading work alongside insightful investors and ambitious companies who build, evolve, and…” Source: RevenueBase Database · checked Sep 28, 2026
11	Fenwick Elliott LLP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	92 contacts →
	Indirect evidence “We advise on every aspect of the construction process from inception through building to completion and operation.” Source: RevenueBase Database · checked Sep 28, 2026
12	Trinity International	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	79 contacts →
	Strong evidence “Trinity International LLP is a niche project and corporate finance law firm focusing on energy, infrastructure, resources and industry with offices in London, Paris, Washington DC…” Source: RevenueBase Database · checked Sep 28, 2026
13	Sustainable Development Capital, LLP Sdcl	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	74 contacts →
	Strong evidence “Sustainable Development Capital LLP (“SDCL”) is a multi-national investment and financial advisory firm, which specialises in environmental infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
14	K&l Gates LLP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	63 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
15	Ashurst LLP	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	53 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
16	JP Legal	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	46 contacts →
	Partial evidence “J&P Legal is a regional law firm advising clients on a wide range of Corporate and Commercial matters.” Source: RevenueBase Database · checked Sep 28, 2026
17	Rosling King LLP	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	45 contacts →
	Partial evidence “Rosling King is a rapidly growing UK-based law firm specialising in serving the needs of financial institutions and the real estate, private equity and construction sectors.” Source: RevenueBase Database · checked Sep 28, 2026
18	Amberside Advisors	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	44 contacts →
	Partial evidence “Amberside Advisors is an independent consultancy providing financial and commercial advice to low carbon energy, infrastructure and public sector projects.” Source: RevenueBase Database · checked Sep 28, 2026
19	Rosenblatt LAW	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	38 contacts →
	Partial evidence “Rosenblatt Law - the experts you come to with an opportunity to seize or an issue to solve.” Source: RevenueBase Database · checked Sep 28, 2026
20	Economic Consulting Associates ECA	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	33 contacts →
	Indirect evidence “Economic Consulting Associates was formed in 1997 to provide economic and regulatory consulting services to industry and government.” Source: RevenueBase Database · checked Sep 28, 2026
21	Pioneer Point Partners	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	33 contacts →
	Strong evidence “Established in 2008, Pioneer is an independent, sustainable infrastructure investment firm.” Source: RevenueBase Database · checked Sep 28, 2026
22	Proc-Global	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	31 contacts →
	Partial evidence “Proctal is a leading multi-disciplinary consulting firm, providing expert services, claim management and dispute resolution, project management, economic and investment advisory…” Source: RevenueBase Database · checked Sep 28, 2026
23	Rosenblatt	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	28 contacts →
	Indirect evidence “Rosenblatt was established in the City of London in 1989.” Source: RevenueBase Database · checked Sep 28, 2026
24	Mayer Brown International LLP	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Partial evidence “Mayer Brown is a distinctively global law firm, uniquely positioned to advise the world’s leading companies and financial institutions on their most complex deals and disputes.” Source: RevenueBase Database · checked Sep 28, 2026
25	Evolution Infrastructure	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	25 contacts →
	Indirect evidence “We are a specialist financial consultancy consisting of over 20 professional staff based in London, UK.” Source: RevenueBase Database · checked Sep 28, 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: infrastructure investment 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 infrastructure investment law firms.
Partial evidence: Its own public description names part of infrastructure investment law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name infrastructure investment 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 247 infrastructure investment law firms based in London, United Kingdom

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Infrastructure investment law firms based in London, United Kingdom at a glance

As of Sep 28, 2026

54.4%Verified-email coverage

39.6Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

134

11-50

51-200

201-500

501-1,000

1,001-5,000

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 247 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 infrastructure investment 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 “infrastructure investment 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 infrastructure investment 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 infrastructure investment 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, 5,316 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 28, 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.

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 infrastructure investment 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 infrastructure investment law firms are there based in London, United Kingdom?

RevenueBase identified 247 infrastructure investment 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?

Slaughter And MAY, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most infrastructure investment law firms?

London leads the United Kingdom with 247 headquartered companies, followed by Bristol (11) and Belfast (9).

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 5,316 verified decision-maker contacts tracked across these 247 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 28, 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.