Company lists · Data refreshed September 2026

Top 25 Sustainable infrastructure investment firms based in the United Kingdom

Name: Sustainable infrastructure 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 29, 2026 333 companies tracked

RevenueBase identified 333 sustainable infrastructure investment firms headquartered in the United Kingdom as of September 2026 and tracks 7,186 professional contacts across them, including 3,982 with verified work emails. London is the largest hub.

This list covers sustainable infrastructure 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 29, 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 29, 2026 86% judged on-target in blind review

333Companies

7,186Contacts tracked

3,982Verified emails

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The 25 largest sustainable infrastructure investment firms based in the United Kingdom

Ranked by team size

Top 25 of 333 sustainable infrastructure investment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to sustainable infrastructure 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	Foresight Group	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	537 contacts →
	Partial evidence “Founded in 1984, Foresight is a leading investment manager in real assets and capital for growth, operating across Europe, Australia, and the United States.” Source: RevenueBase Database · checked Sep 29, 2026
2	Atlantica Sustainable Infrastructure PLC	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	1,001-5,000	503 contacts →
	Strong evidence “Atlantica is a sustainable infrastructure company that owns, manages, develops, builds and invests in renewable energy, storage, efficient natural gas and heat, transmission lines…” Source: RevenueBase Database · checked Sep 29, 2026
3	ACTIS	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	493 contacts →
	Strong evidence “Actis is a leading growth market investor in sustainable infrastructure.” Source: RevenueBase Database · checked Sep 29, 2026
4	Impax Asset Management	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
5	John Laing	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	230 contacts →
	Partial evidence “John Laing is a leading international investor and active manager of core infrastructure assets.” Source: RevenueBase Database · checked Sep 29, 2026
6	Gresham House	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
7	Equitix	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	223 contacts →
	Partial evidence “We are a responsible investor, investing in, developing and managing global infrastructure assets, which materially contribute to the lives of the communities they serve.” Source: RevenueBase Database · checked Sep 29, 2026
8	Infrared Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	197 contacts →
	Partial evidence “InfraRed is a leading international mid-market infrastructure asset manager.” Source: RevenueBase Database · checked Sep 29, 2026
9	Amber Infrastructure	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	171 contacts →
	Partial evidence “Amber is part of Boyd Watterson Global Asset Management Group LLC (‘Boyd’), a global diversified infrastructure, real estate and fixed income business with over $39bn in assets…” Source: RevenueBase Database · checked Sep 29, 2026
10	Generation Investment Management	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
11	Octopus Energy Generation	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
12	Schroders Greencoat LLP	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	119 contacts →
	Strong evidence “Schroders Greencoat is a specialist investment manager dedicated to renewable infrastructure, with over £8.5 billion under management.” Source: RevenueBase Database · checked Sep 29, 2026
13	Igneo Infrastructure Partners	Strong evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
14	The Private Infrastructure Development Group Pidg	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	107 contacts →
	Strong evidence “The Private Infrastructure Development Group (PIDG) mobilises private investment in infrastructure in frontier markets, accelerating climate action and sustainable development…” Source: RevenueBase Database · checked Sep 29, 2026
15	Metallon Corporation	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1,001-5,000	104 contacts →
	Partial evidence “partners and invests in companies across the natural resources and infrastructure sectors.” Source: RevenueBase Database · checked Sep 29, 2026
16	Stafford Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
17	Private Energy Partners	Strong evidence	Swindon, United KingdomHQ checked Sep 29, 2026	51-200	84 contacts →
	Strong evidence “Private Energy Partners (PEP) is an affiliate of Quinbrook, a specialist investment manager focused exclusively on the infrastructure needed to drive the energy and digital…” Source: RevenueBase Database · checked Sep 29, 2026
18	Nextenergy Capital	Partial evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
19	Semperian PPP Investment Partners	Indirect evidence	Bristol, United KingdomHQ checked Sep 29, 2026	51-200	82 contacts →
	Indirect evidence “Semperian owns and manages over 100 assets with a value of £1.3 billion.” Source: RevenueBase Database · checked Sep 29, 2026
20	Icon Infrastructure LLP	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	78 contacts →
	Partial evidence “iCON is an independent investment group with $12 billion in funds under management.” Source: RevenueBase Database · checked Sep 29, 2026
21	Sustainable Development Capital, LLP Sdcl	Strong evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
22	Bridges Fund Management	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	73 contacts →
	Indirect evidence “Bridges is a specialist private markets investor.” Source: RevenueBase Database · checked Sep 29, 2026
23	Edentree Investment Management	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	67 contacts →
	Strong evidence “EdenTree is a sustainable investment manager with a strong heritage.” Source: RevenueBase Database · checked Sep 29, 2026
24	Climate Asset Management	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
25	Nexta Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	65 contacts →
	Partial evidence “Nexta Capital Partners is a holding company which originates, develops, finances builds and operates renewable infrastructure assets.” Source: RevenueBase Database · checked Sep 29, 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 infrastructure 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 infrastructure investment firms.
Partial evidence: Its own public description names part of sustainable infrastructure 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 infrastructure 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 333 sustainable infrastructure investment firms based in the United Kingdom

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Sustainable infrastructure investment firms based in the United Kingdom at a glance

As of Sep 29, 2026

55.4%Verified-email coverage

21.6Average contacts per company

1-10Median size (employees)

78.1%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

177

11-50

108

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 333 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 sustainable infrastructure 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 infrastructure 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 infrastructure 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 infrastructure 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, 3,982 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 29, 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 infrastructure investment firms by metro

Sustainable infrastructure investment firms in London260

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 infrastructure 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 infrastructure investment firms are there based in the United Kingdom?

RevenueBase identified 333 sustainable infrastructure 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?

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

Which city has the most sustainable infrastructure investment firms?

London leads with 260 headquartered companies, followed by Bristol (4) and Birmingham (3).

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 3,982 verified decision-maker contacts tracked across these 333 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 29, 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.