Company lists · Data refreshed September 2026

Top 25 Add-on acquisition firms based in the United Kingdom

Name: Add-on acquisition 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 19, 2026 489 companies tracked

RevenueBase identified 489 add-on acquisition firms headquartered in the United Kingdom as of September 2026 and tracks 9,094 professional contacts across them, including 4,497 with verified work emails. London is the largest hub.

This list covers add-on acquisition 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 19, 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 19, 2026 86% judged on-target in blind review

489Companies

9,094Contacts tracked

4,497Verified emails

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The 25 largest add-on acquisition firms based in the United Kingdom

Ranked by team size

Top 25 of 489 add-on acquisition firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to add-on acquisition 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	HG	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	752 contacts →
	Indirect evidence “Hg is an investor in European and transatlantic technology and services businesses.” Source: RevenueBase Database · checked Sep 19, 2026
2	Permira	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	501-1,000	629 contacts →
	Indirect evidence “Permira is a global investment firm that backs successful businesses with growth ambitions.” Source: RevenueBase Database · checked Sep 19, 2026
3	Privet Capital LLP	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	n/a	469 contacts →
	Indirect evidence “We identify the hidden value in companies that are often in challenging or complex situations, but have a strong core offering.” Source: RevenueBase Database · checked Sep 19, 2026
4	Coller Capital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	376 contacts →
	Indirect evidence “Coller Capital, founded in 1990, is one of the world's leading investors in the secondary market for private assets – and widely acknowledged as an innovator in secondaries.” Source: RevenueBase Database · checked Sep 19, 2026
5	BC Partners	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	333 contacts →
	Indirect evidence “BC Partners is an international investment firm that offers select, focused investment strategies designed to complement each other and create synergies that benefit our investors.” Source: RevenueBase Database · checked Sep 19, 2026
6	Aurelius	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	328 contacts →
	Indirect evidence “AURELIUS is a global alternative investor, distinguished and widely recognised for its operational approach.” Source: RevenueBase Database · checked Sep 19, 2026
7	Cinven	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	294 contacts →
	Indirect evidence “We are a leading pure-play, international private equity firm that has been investing for nearly 50 years.” Source: RevenueBase Database · checked Sep 19, 2026
8	IK Partners	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	273 contacts →
	Partial evidence “IK Partners (“IK”) is a European private equity firm focused on investments in the Benelux, DACH, France, Nordics and the UK.” Source: RevenueBase Database · checked Sep 19, 2026
9	Oakley Capital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	250 contacts →
	Indirect evidence “Founded over 20 years ago, Oakley Capital was established to be the partner of choice for exceptional founders and entrepreneurs.” Source: RevenueBase Database · checked Sep 19, 2026
10	Investindustrial	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	248 contacts →
	Indirect evidence “Investindustrial is a leading European investment firm, founded in 1990, with €17 billion of raised fund capital.” Source: RevenueBase Database · checked Sep 19, 2026
11	Inflexion	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	214 contacts →
	Indirect evidence “Inflexion is a leading European mid-market private equity firm with €20bn under management investing in high growth, entrepreneurial businesses with ambitious management teams and…” Source: RevenueBase Database · checked Sep 19, 2026
12	Keensight Capital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	141 contacts →
	Indirect evidence “Keensight Capital (“Keensight”), one of the leading European Growth Buyout firms, is committed to supporting entrepreneurs as they implement their growth strategies.” Source: RevenueBase Database · checked Sep 19, 2026
13	Tigbourne Capital LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	116 contacts →
	Indirect evidence “Tigbourne Capital is a distinguished private equity firm founded in 2011, headquartered in the UK and boasting a robust footprint across the USA, Europe, and the Arabian Gulf.” Source: RevenueBase Database · checked Sep 19, 2026
14	CVC Secondary Partners	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	111 contacts →
	Partial evidence “CVC Secondary Partners is a private equity strategy focused on secondary private markets globally.” Source: RevenueBase Database · checked Sep 19, 2026
15	TDR Capital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	109 contacts →
	Indirect evidence “TDR is a leading private equity firm with over €16 billion of assets under management and typically invests in strong European companies that are leaders in their markets.” Source: RevenueBase Database · checked Sep 19, 2026
16	Terra Firma	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	109 contacts →
	Indirect evidence “Terra Firma drives value creation.” Source: RevenueBase Database · checked Sep 19, 2026
17	EMK Capital	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	98 contacts →
	Indirect evidence “EMK Capital is a growth-focused private equity firm.” Source: RevenueBase Database · checked Sep 19, 2026
18	Livingbridge	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	98 contacts →
	Indirect evidence “Livingbridge is a leading mid-market private equity firm.” Source: RevenueBase Database · checked Sep 19, 2026
19	MML Capital Partners	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	83 contacts →
	Partial evidence “MML is an international mid-market private equity investor focused on investing alongside strong management teams and working in partnership with them to deliver their bold…” Source: RevenueBase Database · checked Sep 19, 2026
20	YFM Equity Partners	Indirect evidence	Leeds, United KingdomHQ checked Sep 19, 2026	51-200	81 contacts →
	Indirect evidence “YFM Equity Partners are specialist, independently owned, private equity investors.” Source: RevenueBase Database · checked Sep 19, 2026
21	Capvest	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	78 contacts →
	Indirect evidence “Established in CapVest is a leading mid-market private equity firm headquartered in London.” Source: RevenueBase Database · checked Sep 19, 2026
22	Tenzing	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	74 contacts →
	Partial evidence “At Tenzing, we're not just investors; we're partners on a mission.” Source: RevenueBase Database · checked Sep 19, 2026
23	Charterhouse Capital Partners	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	71 contacts →
	Indirect evidence “Charterhouse is one of the longest established private equity firms operating in Europe.” Source: RevenueBase Database · checked Sep 19, 2026
24	Palatine	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	11-50	57 contacts →
	Indirect evidence “We see private equity as a force for good.” Source: RevenueBase Database · checked Sep 19, 2026
25	Endless LLP	Indirect evidence	Leeds, United KingdomHQ checked Sep 19, 2026	11-50	54 contacts →
	Indirect evidence “Private Equity that invests more.” Source: RevenueBase Database · checked Sep 19, 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: add-on acquisition 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 add-on acquisition firms.
Partial evidence: Its own public description names part of add-on acquisition firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name add-on acquisition 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 489 add-on acquisition firms based in the United Kingdom

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Add-on acquisition firms based in the United Kingdom at a glance

As of Sep 19, 2026

49.5%Verified-email coverage

18.6Average contacts per company

1-10Median size (employees)

68.1%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

279

11-50

136

51-200

201-500

501-1,000

1,001-5,000

10001+

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 489 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 add-on acquisition 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 “add-on acquisition 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 add-on acquisition 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 add-on acquisition 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, 4,497 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 19, 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.

Add-on acquisition firms by metro

Add-on acquisition firms in London333

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 add-on acquisition 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 add-on acquisition firms are there based in the United Kingdom?

RevenueBase identified 489 add-on acquisition 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?

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

Which city has the most add-on acquisition firms?

London leads with 333 headquartered companies, followed by Leeds (8) and Birmingham (7).

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 4,497 verified decision-maker contacts tracked across these 489 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 19, 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.