Company lists · Data refreshed September 2026

Top 25 Environmental impact investment firms based in London, United Kingdom

Name: Environmental impact 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 28, 2026 311 companies tracked

RevenueBase identified 311 environmental impact investment firms headquartered in London, United Kingdom as of September 2026 and tracks 4,749 professional contacts across them, including 2,513 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers environmental impact 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 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

311Companies

4,749Contacts tracked

2,513Verified emails

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The 25 largest environmental impact investment firms based in London, United Kingdom

Ranked by team size

Top 25 of 311 environmental impact investment 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 environmental impact 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	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	493 contacts →
	Indirect evidence “Actis is a leading growth market investor in sustainable infrastructure.” Source: RevenueBase Database · checked Sep 28, 2026
2	Impax Asset Management	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
3	Gresham House	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
4	Generation Investment Management	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
5	Octopus Energy Generation	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	153 contacts →
	Indirect evidence “At Octopus Energy Generation, we’re building green power for the future, from large-scale solar to onshore and offshore wind, and innovative initiatives like the Fan Club.” Source: RevenueBase Database · checked Sep 28, 2026
6	Lightrock	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	141 contacts →
	Partial evidence “Lightrock is a global investment platform supporting the growth of technology-enabled companies.” Source: RevenueBase Database · checked Sep 28, 2026
7	Pollination	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	139 contacts →
	Partial evidence “Pollination is a specialist climate investment and advisory firm, dedicated to accelerating the transition to a net zero, nature positive and resilient future.” Source: RevenueBase Database · checked Sep 28, 2026
8	Schroders Greencoat LLP	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
9	Stafford Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
10	Nextenergy Capital	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	83 contacts →
	Partial evidence “NextEnergy Capital was founded in 2007 to become the leading specialist investment and asset manager in the solar sector.” Source: RevenueBase Database · checked Sep 28, 2026
11	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
12	Bridges Fund Management	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	73 contacts →
	Indirect evidence “Bridges is a specialist private markets investor.” Source: RevenueBase Database · checked Sep 28, 2026
13	Xynteo	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	70 contacts →
	Partial evidence “Xynteo is a boutique advisory firm, based in Europe and India, on a mission to help global organisations and investors accelerate sustainable impact and value creation.” Source: RevenueBase Database · checked Sep 28, 2026
14	Thirdway Partners	Strong evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
15	Climate Asset Management	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
16	CAMCO	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	65 contacts →
	Partial evidence “Camco is a climate and impact fund manager, leading the transition to a prosperous net zero future in emerging markets.” Source: RevenueBase Database · checked Sep 28, 2026
17	River Global Investors RGI	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	63 contacts →
	Indirect evidence “RIVER GLOBAL HOLDINGS (RGH) WAS ACQUIRED BY LIONTRUST ON 30 JUNE 2026.” Source: RevenueBase Database · checked Sep 28, 2026
18	Temporis Capital	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	62 contacts →
	Partial evidence “Temporis was founded in 2011 by three seasoned investment industry professionals.” Source: RevenueBase Database · checked Sep 28, 2026
19	Climate Investment CI	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	62 contacts →
	Partial evidence “Climate Investment is a US and UK-based independently managed specialist investor focused on accelerating capital-efficient decarbonization of heavy emitting sectors.” Source: RevenueBase Database · checked Sep 28, 2026
20	RAB Capital	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	62 contacts →
	Indirect evidence “RAB Capital is a private company that invests in a wide range of assets based on fundamental analysis.” Source: RevenueBase Database · checked Sep 28, 2026
21	Just Climate	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	56 contacts →
	Partial evidence “Established by Generation Investment Management, Just Climate is a specialist investment business focused on scaling solutions for the highest-emitting, most off-track sectors of…” Source: RevenueBase Database · checked Sep 28, 2026
22	Ecofin	Indirect evidence	London, United KingdomHQ checked Sep 28, 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 28, 2026
23	Greenbank	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	45 contacts →
	Partial evidence “Tailored investment services, delivered sustainably.” Source: RevenueBase Database · checked Sep 28, 2026
24	NET Purpose	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	40 contacts →
	Partial evidence “Net Purpose is the platform for sustainable and impact investors.” Source: RevenueBase Database · checked Sep 28, 2026
25	RED Ribbon Asset Management PLC	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	39 contacts →
	Indirect evidence “About Founded in 2007, Red Ribbon Asset Management Plc is an Indo-British financial services group building on the legacy of historical, cultural and socio-economic ties between…” 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: environmental impact 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 environmental impact investment firms.
Partial evidence: Its own public description names part of environmental impact investment firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental impact 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 311 environmental impact investment firms based in London, United Kingdom

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Environmental impact investment firms based in London, United Kingdom at a glance

As of Sep 28, 2026

52.9%Verified-email coverage

15.3Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

189

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 311 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 environmental impact 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 “environmental impact 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 environmental impact 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 environmental impact 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, 2,513 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 environmental impact 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 environmental impact investment firms are there based in London, United Kingdom?

RevenueBase identified 311 environmental impact 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 in the United Kingdom has the most environmental impact investment firms?

London leads the United Kingdom with 311 headquartered companies, followed by Bristol (8) and Edinburgh (5).

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 2,513 verified decision-maker contacts tracked across these 311 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.