Company lists · Data refreshed September 2026

Top 25 Impact investment firms based in the United Kingdom

Name: Impact 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 3, 2026 349 companies tracked

RevenueBase identified 349 impact investment firms headquartered in the United Kingdom as of September 2026 and tracks 3,833 professional contacts across them, including 1,899 with verified work emails and 289 with mobile numbers. London is the largest hub.

This list covers impact 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

349Companies

3,833Contacts tracked

1,899Verified emails

289Mobile numbers

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The 25 largest impact investment firms based in the United Kingdom

Ranked by team size

Top 25 of 349 impact investment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names impact investment firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Gresham HouseIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	223
	“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 3, 2026
2	Ccla Investment ManagementStrong evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	205
	“Our purpose is to help our clients maximise their impact on society by harnessing the power of investment markets.” Source: company website · checked Sep 3, 2026
3	Generation Investment ManagementPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	155
	“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 3, 2026
4	Better Society CapitalPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	120
	“Better Society Capital is the UK’s leading social impact investor.” Source: company website · checked Sep 3, 2026
5	Waverton Investment ManagementPartial evidence	London, United KingdomHQ checked Sep 3, 2026	201-500	94
	“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 3, 2026
6	The Ingenious GroupStrong evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	89
	“We believe that our investments should deliver not only for our investors but also create a positive impact for the communities in which we operate.” Source: company website · checked Sep 3, 2026
7	AgdevcoPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	84
	“AgDevCo is a specialist impact investor operating exclusively in the agriculture sector in Africa.” Source: company website · checked Sep 3, 2026
8	Edentree Investment ManagementPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	65
	“EdenTree is a sustainable investment manager with a strong heritage.” Source: company website · checked Sep 3, 2026
9	GSG ImpactPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	65
	“GSG Impact builds impact economies.” Source: company website · checked Sep 3, 2026
10	Development Partners International DPIStrong evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	62
	“DPI is an Africa focused private investment firm with US$3.1 billion in assets under management and co-investments across three funds, targeting high growth, impact-driven, and…” Source: company website · checked Sep 3, 2026
11	River Global Investors RGIPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	62
	“River Global Investors is an investment management company offering a range of UK, European, Indian and Global strategies.” Source: company website · checked Sep 3, 2026
12	Temporis CapitalPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	60
	“Temporis was founded in 2011 by three seasoned investment industry professionals.” Source: company website · checked Sep 3, 2026
13	Apis PartnersIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	57
	“Headquartered in London, the Apis Group (“Apis”) is a private equity firm investing in tech-enabled financial infrastructure and services across Europe and growth markets, with…” Source: company website · checked Sep 3, 2026
14	LagataIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	52
	“Lagata invest in businesses in growth markets, with a specific expertise in emerging markets and particularly in sub-Saharan Africa.” Source: company website · checked Sep 3, 2026
15	GreenbankPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	46
	“Tailored investment services, delivered sustainably.” Source: company website · checked Sep 3, 2026
16	BIG Issue InvestStrong evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	45
	“Big Issue Invest is the investment arm of the Big Issue Group, founded by visionary impact entrepreneurs John Bird and Nigel Kershaw.” Source: company website · checked Sep 3, 2026
17	GravisPartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	43
	“At Gravis we believe in a long-term approach to investment.” Source: company website · checked Sep 3, 2026
18	Finance EarthStrong evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	41
	“Finance Earth (formerly Environmental Finance) is a leading environmental impact investment advisor and fund manager, working across the conservation, natural and built asset…” Source: company website · checked Sep 3, 2026
19	Evenlode InvestmentPartial evidence	Evenlode, United KingdomHQ checked Sep 3, 2026	11-50	40
	“Evenlode Investment Management is an employee-owned, North Cotswolds based investment company, with a sole focus on investing in the shares of high-quality companies over the long…” Source: company website · checked Sep 3, 2026
20	GC InsightPartial evidence	Manchester, United KingdomHQ checked Sep 3, 2026	11-50	40
	“PURPOSE-DRIVEN RESEARCH & ADVICE SERVICES We are a social enterprise, committed to generating social value impacts and helping our clients have a more positive impact on place…” Source: company website · checked Sep 3, 2026
21	Oxygen House GroupStrong evidence	Exeter, United KingdomHQ checked Sep 3, 2026	51-200	40
	“Oxygen House focuses on impact investment in data analytics, education, sustainable property development, renewable energy, and city planning, leveraging patient capital for a…” Source: company website · checked Sep 3, 2026
22	NET PurposePartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	40
	“Net Purpose is the platform for sustainable and impact investors.” Source: company website · checked Sep 3, 2026
23	Zouk Capital LLPIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	38
	“Zouk Capital is a fund manager focused on the opportunities emerging at the intersection of infrastructure, technology and sustainability.” Source: company website · checked Sep 3, 2026
24	Tribe Impact CapitalPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	34
	“Tribe is the UK’s first dedicated Impact Wealth Manager and offers discretionary and advisory portfolio management.” Source: company website · checked Sep 3, 2026
25	Puma Capital GroupIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	32
	“Simply put, we invest in relationships to amplify the success of the people, businesses and projects we support.” Source: company website · checked Sep 3, 2026

Showing 25 of 349 impact investment firms based in the United Kingdom

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Impact investment firms based in the United Kingdom at a glance

As of Sep 3, 2026

1-10Median size (employees)

LondonLargest hub · 250 HQs

289Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

223

11-50

51-200

201-500

Verified emails by last verification

0–30

31–60

141

61–90

1,083

90–180

670

180+

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 impact investment firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “impact investment firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among impact 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 an evidence 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, 1,899 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 3, 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.

Impact investment firms by metro

Impact investment firms in London250

Frequently asked

How many impact investment firms are there based in the United Kingdom?

RevenueBase identified 349 impact 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?

Gresham House, headquartered in Witney, tops this list with the largest team on record.

Which city has the most impact investment firms?

London leads with 250 headquartered companies, followed by Edinburgh (6) and Bristol (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 1,899 verified decision-maker contacts tracked across these 349 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 3, 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 SmartSearch, 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.