Company lists · Data refreshed September 2026

Top 25 Sustainable investment firms based in the United Kingdom

Name: Sustainable investment firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 6, 2026 268 companies tracked

RevenueBase identified 268 sustainable investment firms headquartered in the United Kingdom as of September 2026 and tracks 13,840 professional contacts across them, including 6,343 with verified work emails and 1,207 with mobile numbers. London is the largest hub.

This list covers sustainable investment firms headquartered in the 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 6, 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 6, 2026 86% judged on-target in blind review

268Companies

13,840Contacts tracked

6,343Verified emails

1,207Mobile numbers

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The 25 largest sustainable investment firms based in the United Kingdom

Ranked by team size

Top 25 of 268 sustainable investment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 6, 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	Baillie Gifford	Partial evidence	Edinburgh, United KingdomHQ checked Sep 6, 2026	1,001-5,000	1,549 contacts →
	“We are an independent investment manager founded over a century ago in Edinburgh, owned and run by 59 partners.” Source: company website · checked Sep 6, 2026
2	ACTIS	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	493 contacts →
	“Actis is a leading growth market investor in sustainable infrastructure.” Source: company website · checked Sep 6, 2026
3	Federated Hermes Limited	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	501-1,000	451 contacts →
	“Federated Hermes is guided by the conviction that responsible investing is the best way to create long-term wealth.” Source: company website · checked Sep 6, 2026
4	Impax Asset Management	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	331 contacts →
	“Founded in 1998, Impax is a specialist asset manager investing in the opportunities arising from the transition to a more sustainable global economy.” Source: company website · checked Sep 6, 2026
5	Gresham House	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	227 contacts →
	“Gresham House is a specialist investor focused on delivering financial returns for clients by investing in the global themes shaping our future.” Source: company website · checked Sep 6, 2026
6	Generation Investment Management	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	156 contacts →
	“Overview Generation was established in 2004 as an independent, private, investment management partnership with offices in London and San Francisco.” Source: company website · checked Sep 6, 2026
7	Schroders Greencoat LLP	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	119 contacts →
	“Schroders Greencoat is a specialist investment manager dedicated to renewable infrastructure, with over £8.5 billion under management.” Source: company website · checked Sep 6, 2026
8	Igneo Infrastructure Partners	Strong evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	117 contacts →
	“Sustainable Value Creation Through Partnership We seek to deliver sustainable returns through investment in mature, stable, infrastructure businesses.” Source: company website · checked Sep 6, 2026
9	Continuum Financial Services LLP	Indirect evidence	Plymouth, United KingdomHQ checked Sep 6, 2026	51-200	110 contacts →
	“We are an award-winning National Independent Financial Advice firm that offers a modern financial advice service.” Source: company website · checked Sep 6, 2026
10	Holtara An Apex Group Company	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	100 contacts →
	“Our mission is to positively impact businesses today, for a sustainable tomorrow.” Source: company website · checked Sep 6, 2026
11	Stafford Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	97 contacts →
	“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: company website · checked Sep 6, 2026
12	Columbia Threadneedle Investments Emea Apac	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	1,001-5,000	96 contacts →
	“At Columbia Threadneedle Investments, we invest to make a difference in your world, and the wider world.” Source: company website · checked Sep 6, 2026
13	Waverton Investment Management	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	201-500	92 contacts →
	“Waverton is an award-winning investment management house dedicated to creating high-quality investment solutions and providing bespoke, personal service for private clients…” Source: company website · checked Sep 6, 2026
14	Sustainable Development Capital, LLP Sdcl	Strong evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	74 contacts →
	“Sustainable Development Capital LLP (“SDCL”) is a multi-national investment and financial advisory firm, which specialises in environmental infrastructure.” Source: company website · checked Sep 6, 2026
15	Legal & General Investment Management Lgim	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	1,001-5,000	74 contacts →
	“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: company website · checked Sep 6, 2026
16	Edentree Investment Management	Strong evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	67 contacts →
	“EdenTree is a sustainable investment manager with a strong heritage.” Source: company website · checked Sep 6, 2026
17	Climate Asset Management	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	66 contacts →
	“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: company website · checked Sep 6, 2026
18	River Global Investors RGI	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	63 contacts →
	“RIVER GLOBAL HOLDINGS (RGH) WAS ACQUIRED BY LIONTRUST ON 30 JUNE 2026.” Source: company website · checked Sep 6, 2026
19	Fundsmith LLP UK	Partial evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	55 contacts →
	“We are an investment management firm established in 2010 by Terry Smith.” Source: company website · checked Sep 6, 2026
20	Heptagon Capital	Partial evidence	Mayfair, United KingdomHQ checked Sep 6, 2026	11-50	52 contacts →
	“Heptagon Capital, founded in 2005, is a leading provider of specialised asset management services and investment solutions to Institutional Investors, Family Offices and Ultra…” Source: company website · checked Sep 6, 2026
21	Ecofin	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	51 contacts →
	“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: company website · checked Sep 6, 2026
22	Castlefield	Partial evidence	Manchester, United KingdomHQ checked Sep 6, 2026	51-200	46 contacts →
	“We're Castlefield - an award-winning, employee-owned investment management and financial planning group, recognised for being at the forefront of ethical investing since 2002.” Source: company website · checked Sep 6, 2026
23	Greenbank	Strong evidence	London, United KingdomHQ checked Sep 6, 2026	51-200	45 contacts →
	“Tailored investment services, delivered sustainably.” Source: company website · checked Sep 6, 2026
24	Gravis	Partial evidence	Mayfair, United KingdomHQ checked Sep 6, 2026	51-200	43 contacts →
	“At Gravis we believe in a long-term approach to investment.” Source: company website · checked Sep 6, 2026
25	Troy Asset Management Limited	Indirect evidence	London, United KingdomHQ checked Sep 6, 2026	11-50	42 contacts →
	“Our aim is to protect investors’ capital and increase its value over the long-term.” Source: company website · checked Sep 6, 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 268 sustainable investment firms based in the United Kingdom

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Sustainable investment firms based in the United Kingdom at a glance

As of Sep 6, 2026

45.8%Verified-email coverage

8.7%Mobile-number coverage

51.6Average contacts per company

1-10Median size (employees)

66.4%Largest-city concentration · London

Sep 6, 2026Page data refreshed

Companies by employee count

1-10

148

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

5,8620–30

38731–60

961–90

590–180

80180+

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 the 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 United Kingdom 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, 6,343 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 6, 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

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 the United Kingdom?

RevenueBase identified 268 sustainable investment firms headquartered in the 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?

Baillie Gifford, headquartered in Edinburgh, 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 6,343 verified decision-maker contacts tracked across these 268 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 6, 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.