Company lists · Data refreshed September 2026

Top 25 Esg strategy consulting firms based in London, United Kingdom

Name: Esg strategy consulting 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 30, 2026 1,246 companies tracked

RevenueBase identified 1,246 esg strategy consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 43,878 professional contacts across them, including 22,600 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers esg strategy consulting 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 30, 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 30, 2026 86% judged on-target in blind review

1,246Companies

43,878Contacts tracked

22,600Verified emails

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The 25 largest esg strategy consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 1,246 esg strategy consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to esg strategy consulting 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	Ey-Parthenon	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	10001+	17,070 contacts →
	Partial evidence “Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.” Source: RevenueBase Database · checked Sep 30, 2026
2	ERM	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	5,001-10,000	9,119 contacts →
	Indirect evidence “Sustainability is our business.” Source: RevenueBase Database · checked Sep 30, 2026
3	SLR Consulting	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	3,848 contacts →
	Indirect evidence “SLR is a committed partner in our clients’ sustainability journeys.” Source: RevenueBase Database · checked Sep 30, 2026
4	Baringa	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	2,179 contacts →
	Partial evidence “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Source: RevenueBase Database · checked Sep 30, 2026
5	Anthesis Group	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	894 contacts →
	Indirect evidence “Anthesis guides clients to sustainable performance.” Source: RevenueBase Database · checked Sep 30, 2026
6	Ricardo PLC	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	1,001-5,000	670 contacts →
	Indirect evidence “Click the 'Follow' button and explore careers at Ricardo on our 'Jobs' and 'Life' tabs and at careers.ricardo.com.” Source: RevenueBase Database · checked Sep 30, 2026
7	Mercer UK	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	10001+	329 contacts →
	Indirect evidence “At Mercer, A Marsh business, we’re helping our clients realize their investment objectives, shape the future of work, and enhance health and retirement outcomes for their people.” Source: RevenueBase Database · checked Sep 30, 2026
8	CIL Strategy Consultants	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	284 contacts →
	Partial evidence “CIL is a global growth strategy consultancy.” Source: RevenueBase Database · checked Sep 30, 2026
9	The Erith Group	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	501-1,000	217 contacts →
	Partial evidence “Supported by a network of specialist consulting engineers, environmentalists and our own collective experience, our philosophy is simple: to provide a qualitative economic and…” Source: RevenueBase Database · checked Sep 30, 2026
10	Flint Global	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	214 contacts →
	Indirect evidence “Flint specialises in advising businesses and investors on how to navigate and surmount the policy, political, regulatory and competition challenges they face in European and…” Source: RevenueBase Database · checked Sep 30, 2026
11	True North Partners	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	185 contacts →
	Partial evidence “True North Partners LLP is an independent consulting firm based in London, Johannesburg, Frankfurt, Amsterdam and Madrid.” Source: RevenueBase Database · checked Sep 30, 2026
12	CVL	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	n/a	165 contacts →
	Partial evidence “Strategic development for already dynamic businesses, successful mergers & acquisitions between household names, technology planning in cutting edge industries and real-world…” Source: RevenueBase Database · checked Sep 30, 2026
13	ACRE	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	158 contacts →
	Indirect evidence “Acre is the global market leader for sustainability executive search and recruitment services, exclusively focused on integrating sustainability and catalysing positive change…” Source: RevenueBase Database · checked Sep 30, 2026
14	Evora Global	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	148 contacts →
	Indirect evidence “EVORA is an award-winning global sustainability consultancy and software provider supporting real asset investors, owners, and operators.” Source: RevenueBase Database · checked Sep 30, 2026
15	Athens	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	11-50	122 contacts →
	Indirect evidence “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Source: RevenueBase Database · checked Sep 30, 2026
16	ZTP	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	115 contacts →
	Indirect evidence “At ZTP, we’re committed to accelerating the transition to a more sustainable future by reducing the negative impact of human activity on our planet - ecologically, financially…” Source: RevenueBase Database · checked Sep 30, 2026
17	Longevity Partners	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	115 contacts →
	Indirect evidence “Longevity Partners is a multidisciplinary energy and sustainability consultancy.” Source: RevenueBase Database · checked Sep 30, 2026
18	Holtara An Apex Group Company	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	100 contacts →
	Indirect evidence “Our mission is to positively impact businesses today, for a sustainable tomorrow.” Source: RevenueBase Database · checked Sep 30, 2026
19	Valentia Partners	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	94 contacts →
	Partial evidence “Valentia Partners is a specialist Management Consulting firm.” Source: RevenueBase Database · checked Sep 30, 2026
20	Greengage Environmental LTD	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	93 contacts →
	Indirect evidence “Greengage is an independent sustainability and environmental consultancy known for providing bespoke advice and working in partnership with our clients and multi-disciplinary…” Source: RevenueBase Database · checked Sep 30, 2026
21	Sustainable Advantage	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	89 contacts →
	Indirect evidence “Sustainable Advantage partners with Private Equity funds and businesses across the UK, France, and wider Europe.” Source: RevenueBase Database · checked Sep 30, 2026
22	Alfa Energy An Edison Energy Company	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	201-500	88 contacts →
	Indirect evidence “Alfa Energy Group (an Edison Energy company) is an international energy, sustainability and technology consultant partner with 200 employees over four international locations.” Source: RevenueBase Database · checked Sep 30, 2026
23	Xco2	Indirect evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	84 contacts →
	Indirect evidence “We are a multidisciplinary group with backgrounds in engineering, architecture and environmental science, working as consultants for buildings, large developments and masterplans…” Source: RevenueBase Database · checked Sep 30, 2026
24	FLAG	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	84 contacts →
	Partial evidence “We're a global sustainability agency, providing strategy, communications and reporting support to the world’s leading brands.” Source: RevenueBase Database · checked Sep 30, 2026
25	Design Portfolio	Partial evidence	London, United KingdomHQ checked Sep 30, 2026	51-200	82 contacts →
	Partial evidence “Design Portfolio helps forward-thinking companies build trust with their stakeholders through creative storytelling, integrated communications, and sustainability strategies.” Source: RevenueBase Database · checked Sep 30, 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: esg strategy consulting 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 esg strategy consulting firms.
Partial evidence: Its own public description names part of esg strategy consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name esg strategy consulting 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 1,246 esg strategy consulting firms based in London, United Kingdom

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Esg strategy consulting firms based in London, United Kingdom at a glance

As of Sep 30, 2026

51.5%Verified-email coverage

35.2Average contacts per company

1-10Median size (employees)

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

905

11-50

249

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 1,246 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 esg strategy consulting 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 “esg strategy consulting 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 esg strategy consulting 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 esg strategy consulting 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, 22,600 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 30, 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.

Esg strategy consulting 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 esg strategy consulting 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 esg strategy consulting firms are there based in London, United Kingdom?

RevenueBase identified 1,246 esg strategy consulting 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?

Ey-Parthenon, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most esg strategy consulting firms?

London leads the United Kingdom with 1,246 headquartered companies, followed by Manchester (60) and Bristol (55).

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 22,600 verified decision-maker contacts tracked across these 1,246 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 30, 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.