Company lists · Data verified August 2026

Top 25 Due diligence consulting firms based in the United Kingdom

Name: Due diligence consulting firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 66 companies tracked

There are 66 due diligence consulting firms headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 569 professional contacts across them, including 277 with verified work emails and 83 with mobile numbers. London is the largest hub.

This list covers due diligence consulting 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. Data current as of August 28, 2026.

66Companies

569Contacts tracked

277Verified emails

83Mobile numbers

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The 25 largest due diligence consulting firms based in the United Kingdom

Ranked by team size

Top 25 of 66 due diligence consulting firms based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Neotas	London	51-200	157	99
2	Palladium Digital	London	51-200	48	32
3	GRS An Nv5 Company	London	1,001-5,000	47	27
4	Ringstone	London	51-200	31	22
5	Connell Consulting	London	11-50	24	14
6	Ground Truth Intelligence	London	11-50	23	15
7	Hartford Advisers	London	11-50	15	8
8	Kent Finance	Pluckley	11-50	15	5
9	Fulcrum Diligence LTD	London	11-50	11	8
10	Confidas	Europe	11-50	11	8
11	Luminii Consulting	Manchester	11-50	9	7
12	Gmtl Advisory	London	11-50	9	1
13	Osterwald Rathbone & Partners	London	1-10	8	5
14	DNS Corporate Advisory	London	1-10	7	4
15	Ardra Partners	London	1-10	5	2
16	DE Vere Intellica	London	11-50	4	3
17	IDA Business Consulting LTD	London	1-10	4	1
18	Tech Stack Authority	London	1-10	4	1
19	Mint Analysis	London	1-10	4	1
20	CAENA	London	1-10	3	2
21	Proponent Capital LTD	London	1-10	2	2
22	4d DUE Diligence	London	11-50	2	1
23	Burns & Turner LTD	Sunderland	11-50	1	1
24	BARTY	London	1-10	1	1
25	Clipper Consulting	Old Basing	1-10	1	1

Showing 25 of 66 due diligence consulting firms based in the United Kingdom

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Due diligence consulting firms based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 46 HQs

83Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Due diligence consulting firms by metro

Metro	Companies
Due diligence consulting firms in London	46
Due diligence consulting firms in Bishops Stortford	1
Due diligence consulting firms in St Albans	1
Due diligence consulting firms in Manchester	1
Due diligence consulting firms in Birmingham	1
Due diligence consulting firms in Tonbridge	1
Due diligence consulting firms in Sunderland	1

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “due diligence consulting firms”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many due diligence consulting firms are there based in the United Kingdom?

There are 66 due diligence consulting firms headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

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

Which city has the most due diligence consulting firms?

London leads with 46 headquartered companies, followed by Bishops Stortford (1) and St Albans (1).

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 277 verified decision-maker contacts tracked across these 66 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.