Company lists · Data refreshed September 2026

Top 25 Due diligence consulting firms based in the United Kingdom

RevenueBase identified 66 company matches for due diligence consulting firms associated with the United Kingdom as of September 2026 and 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 company matches for due diligence consulting firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 1, 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 RevenueBase SmartSearch · Exact Recorded Sep 1, 2026 How this list was built
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 company matches for due diligence consulting firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 1, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchLondon, United Kingdom51-200157 contacts →

Exact match

“By leveraging cutting-edge technology and experienced analysts, Neotas are going beyond and setting new standards in Due Diligence, Staff Screening, and Compliance.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
2Exact matchLondon, United Kingdom51-20048 contacts →

Exact match

“We empower private equity firms to make sound investment decisions with our award-winning digital due diligence, whilst supporting portfolio companies through necessary digital…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
3Exact matchLondon, United Kingdom1,001-5,00047 contacts →

Exact match

“On the leading edge of innovation in commercial real estate transactions, GRS an NV5 Company is one of the largest national provider CRE due diligence services.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
4Exact matchLondon, United Kingdom51-20031 contacts →

Exact match

“RingStone works with investors, software, and tech-enabled companies to add value to their businesses and investments.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
5Exact matchLondon, United Kingdom11-5024 contacts →

Exact match

“Connell Consulting has a reputation for carrying out reliable and well-researched commercial due diligence, strategic and operational improvement projects, delivered by a…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
6Exact matchLondon, United Kingdom11-5023 contacts →

Exact match

“Ground Truth Intelligence is the global due diligence platform designed for an ever-changing world.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
7Exact matchLondon, United Kingdom11-5015 contacts →

Exact match

“Hartford Advisers is a specialist intelligence, research and due diligence firm.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
8Exact matchPluckley, United Kingdom11-5015 contacts →

Exact match

“Delivering financial clarity and confidence to decision-makers!”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
9Exact matchLondon, United Kingdom11-5011 contacts →

Exact match

“Due Diligence as it should be.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
10Exact matchEurope, United Kingdom11-5011 contacts →

Exact match

“Confidas People - People Assessment for investment.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
11Exact matchManchester, United Kingdom11-509 contacts →

Exact match

“Luminii Consulting is an award-winning consultancy recognised as the CDD Provider of the Year at the 2023 Real Deals Private Equity Awards.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
12Exact matchLondon, United Kingdom11-509 contacts →

Exact match

“Strategic intelligence and high end due diligence provider to global corporations and investors.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
13Exact matchLondon, United Kingdom1-108 contacts →

Exact match

“Osterwald Rathbone & Partners focuses on providing industry-led professional consulting advice to corporate entities & their legal representatives in a variety of situations…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
14Exact matchLondon, United Kingdom1-107 contacts →

Exact match

“We advise UK owner-managed businesses on buying, selling, valuing and funding companies in the £500k to £10m deal range.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
15Exact matchLondon, United Kingdom1-105 contacts →

Exact match

“Ardra Partners is a specialist consultant that provides services to a selected group of clients in a range of high growth subsectors.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
16Exact matchLondon, United Kingdom11-504 contacts →

Exact match

“De Vere Intellica has provided a wide range of services to the Financial Services, Legal, Insolvency, Corporate and Not-for Profit sectors since the early 1990s.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
17Exact matchLondon, United Kingdom1-104 contacts →

Exact match

“Ida Business Consulting was founded by Murat Barin who is a dual qualified accountant in Turkey and England.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
18Exact matchLondon, United Kingdom1-104 contacts →

Exact match

“Tech Stack Authority is a leader in technical assessment and due diligence, providing fast, high-quality and cost-efficient tech diagnostics to business leaders to help them drive…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
19Exact matchLondon, United Kingdom1-104 contacts →

Exact match

“Protect your brand & culture with M.INT.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
20Exact matchLondon, United Kingdom1-103 contacts →

Exact match

“We help private equity and venture capital funds optimise portfolio value.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
21Exact matchLondon, United Kingdom1-102 contacts →

Exact match

“Proponent Capital is a business that provides consulting services to sophisticated corporate investors to help them understand their opportunities to invest in transactions which…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
22Exact matchLondon, United Kingdom11-502 contacts →

Exact match

“4D conducts due diligence services into technology, products, sales, and companies on behalf of our clients.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
23Exact matchSunderland, United Kingdom11-501 contacts →

Exact match

“From conducting independent business evaluations, creating powerful data insight and analysis, managing data compliance risks, and developing your future strategy, everything we…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
24Exact matchLondon, United Kingdom1-101 contacts →

Exact match

“Guiding businesses and investors through the toughest technology choices, from diligence to delivery.”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase
25Exact matchOld Basing, United Kingdom1-101 contacts →

Exact match

“High Level Due Diligence | Risk Advisory | Problem Solving | Non-Executive Director | Executive Coaching Andy Wynn, Principal 35+ years experience, chair, CEO, director positions…”

Recorded in the RevenueBase company graph · Sep 1, 2026 · View company records in RevenueBase

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

See the full list, filter by size, metro and specialty, and access 277 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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

As of Sep 1, 2026
48.7%Verified-email coverage
14.6%Mobile-number coverage
8.6Average contacts per company
1-10Median size (employees)
69.7%Largest-city concentration · London
Sep 1, 2026Page data refreshed

Companies by employee count

1-10
39
11-50
21
51-200
4
201-500
1
1,001-5,000
1

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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
Company records associated with the United Kingdom whose business descriptions match “due diligence consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch
Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview
The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality
RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 277 professional contacts with verified work emails across the full matched dataset. 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 1, 2026. Lists refresh periodically as the graph is re-checked.
Record context
Company records and descriptions can change. Check the company's website for its current services and locations.

Due diligence consulting firms by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “due diligence consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

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

RevenueBase identified 66 company matches for due diligence consulting firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Neotas tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most due diligence consulting firms?

London leads with 46 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 277 professional contacts with verified work emails tracked across these 66 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 1, 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.