Company lists · Data refreshed September 2026

Top 25 Sustainable investment firms based in London, United Kingdom

Name: Sustainable investment 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 13, 2026 199 companies tracked

RevenueBase identified 199 sustainable investment firms headquartered in London, United Kingdom as of September 2026 and tracks 4,654 professional contacts across them, including 2,373 with verified work emails and 414 with mobile numbers. London is the largest hub.

This list covers sustainable investment 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 13, 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 13, 2026 86% judged on-target in blind review

199Companies

4,654Contacts tracked

2,373Verified emails

414Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest sustainable investment firms based in London, United Kingdom

Ranked by team size

Top 25 of 199 sustainable investment firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable investment 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	ACTIS	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	493 contacts →
	Partial evidence “Actis is a leading growth market investor in sustainable infrastructure.” Source: RevenueBase Database · checked Sep 13, 2026
2	Federated Hermes Limited	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	501-1,000	451 contacts →
	Indirect evidence “Federated Hermes is guided by the conviction that responsible investing is the best way to create long-term wealth.” Source: RevenueBase Database · checked Sep 13, 2026
3	Impax Asset Management	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	331 contacts →
	Partial evidence “Founded in 1998, Impax is a specialist asset manager investing in the opportunities arising from the transition to a more sustainable global economy.” Source: RevenueBase Database · checked Sep 13, 2026
4	Gresham House	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	227 contacts →
	Indirect evidence “Gresham House is a specialist investor focused on delivering financial returns for clients by investing in the global themes shaping our future.” Source: RevenueBase Database · checked Sep 13, 2026
5	Generation Investment Management	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	156 contacts →
	Partial evidence “Overview Generation was established in 2004 as an independent, private, investment management partnership with offices in London and San Francisco.” Source: RevenueBase Database · checked Sep 13, 2026
6	Schroders Greencoat LLP	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	119 contacts →
	Partial evidence “Schroders Greencoat is a specialist investment manager dedicated to renewable infrastructure, with over £8.5 billion under management.” Source: RevenueBase Database · checked Sep 13, 2026
7	Igneo Infrastructure Partners	Strong evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
8	Holtara An Apex Group Company	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	100 contacts →
	Partial evidence “Our mission is to positively impact businesses today, for a sustainable tomorrow.” Source: RevenueBase Database · checked Sep 13, 2026
9	Stafford Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	97 contacts →
	Partial evidence “Stafford Capital Partners ("Stafford") is an independent private markets investment and advisory firm with USD 8.9bn in assets under management and advice for more than 150+…” Source: RevenueBase Database · checked Sep 13, 2026
10	Columbia Threadneedle Investments Emea Apac	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	96 contacts →
	Partial evidence “At Columbia Threadneedle Investments, we invest to make a difference in your world, and the wider world.” Source: RevenueBase Database · checked Sep 13, 2026
11	Waverton Investment Management	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	92 contacts →
	Partial evidence “Waverton is an award-winning investment management house dedicated to creating high-quality investment solutions and providing bespoke, personal service for private clients…” Source: RevenueBase Database · checked Sep 13, 2026
12	Sustainable Development Capital, LLP Sdcl	Strong evidence	London, United KingdomHQ checked Sep 13, 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 13, 2026
13	Legal & General Investment Management Lgim	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	74 contacts →
	Partial evidence “We are aware that a small number of investors have been targeted by fraudsters using the LGIM and L&G brands to promote fake funds and investment products.” Source: RevenueBase Database · checked Sep 13, 2026
14	Thirdway Partners	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	68 contacts →
	Strong evidence “ThirdWay Partners operates as an impact investment and advisory firm focused on creating inclusive sustainable development and impact.” Source: RevenueBase Database · checked Sep 13, 2026
15	Edentree Investment Management	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	67 contacts →
	Strong evidence “EdenTree is a sustainable investment manager with a strong heritage.” Source: RevenueBase Database · checked Sep 13, 2026
16	Climate Asset Management	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	66 contacts →
	Indirect evidence “Climate Asset Management was formed in 2020 as a joint venture of HSBC Asset Management and Pollination, with the ambition to grow the world’s leading asset management company in…” Source: RevenueBase Database · checked Sep 13, 2026
17	River Global Investors RGI	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	63 contacts →
	Indirect evidence “RIVER GLOBAL HOLDINGS (RGH) WAS ACQUIRED BY LIONTRUST ON 30 JUNE 2026.” Source: RevenueBase Database · checked Sep 13, 2026
18	Fundsmith LLP UK	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	55 contacts →
	Partial evidence “We are an investment management firm established in 2010 by Terry Smith.” Source: RevenueBase Database · checked Sep 13, 2026
19	Ecofin	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	51 contacts →
	Indirect evidence “The Ecofin team at Redwheel manages a range of global equity thematic strategies with the aim of delivering strong risk-adjusted returns to clients while tackling some of the…” Source: RevenueBase Database · checked Sep 13, 2026
20	Greenbank	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	45 contacts →
	Strong evidence “Tailored investment services, delivered sustainably.” Source: RevenueBase Database · checked Sep 13, 2026
21	Troy Asset Management Limited	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	42 contacts →
	Indirect evidence “Our aim is to protect investors’ capital and increase its value over the long-term.” Source: RevenueBase Database · checked Sep 13, 2026
22	Osmosis Investment Management	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	40 contacts →
	Strong evidence “Osmosis’ mission since 2009 has been to become the world’s leading dedicated sustainable asset manager, delivering client-focused investment solutions across multiple asset…” Source: RevenueBase Database · checked Sep 13, 2026
23	NET Purpose	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	40 contacts →
	Partial evidence “Net Purpose is the platform for sustainable and impact investors.” Source: RevenueBase Database · checked Sep 13, 2026
24	Earth Active LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	39 contacts →
	Partial evidence “Earth Active is an award-winning consultancy with a globally experienced team of bespoke ESG advisors and expert specialists that provide investment and risk due diligence in…” Source: RevenueBase Database · checked Sep 13, 2026
25	Zouk Capital LLP	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	39 contacts →
	Partial evidence “Zouk Capital is a fund manager focused on the opportunities emerging at the intersection of infrastructure, technology and sustainability.” Source: RevenueBase Database · checked Sep 13, 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: sustainable investment 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 sustainable investment firms.
Partial evidence: Its own public description names part of sustainable investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name sustainable investment 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 199 sustainable investment firms based in London, United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,373 reachable decision-makers.

Free signup · no credit card

View the full list →

Sustainable investment firms based in London, United Kingdom at a glance

As of Sep 13, 2026

51.0%Verified-email coverage

8.9%Mobile-number coverage

23.4Average contacts per company

1-10Median size (employees)

89.4%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

110

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 16.0d

1,8950–30

45531–60

1361–90

190–180

9180+

Company record updated

Median 58.0d

00–30

2,44431–60

1,49261–90

34590–180

373180+

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 sustainable investment 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 “sustainable investment 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 sustainable investment 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 sustainable investment 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, 2,373 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 13, 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.

Sustainable investment firms by metro in the United Kingdom

Sustainable investment firms in London178

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 sustainable investment 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 sustainable investment firms are there based in London, United Kingdom?

RevenueBase identified 199 sustainable investment 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?

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

Which city has the most sustainable investment firms?

London leads with 178 headquartered companies, followed by Edinburgh (7) and Manchester (4).

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 2,373 verified decision-maker contacts tracked across these 199 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 13, 2026.

Ready to reach these companies? Verified emails and direct dials for all 199 sustainable investment firms based in London, United Kingdom. Start with a free account, no credit card.

Download this list →

Related lists

Sustainable investment firms by geography

Browse the directory

Browse: Companies home · Sustainable investment firms in United Kingdom · All United Kingdom lists · All Sustainable investment firms lists · New lists

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.