Company lists · Data refreshed September 2026

Top 25 Advisory and outsourcing services based in the United Kingdom

Name: Advisory and outsourcing services based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 14,019 companies tracked

RevenueBase identified 14,019 company matches for advisory and outsourcing services associated with the United Kingdom as of September 2026 and tracks 562,380 professional contacts across them, including 201,382 with verified work emails and 47,989 with mobile numbers. London is the largest hub.

This list covers company matches for advisory and outsourcing services 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 23, 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 23, 2026 How this list was built

14,019Companies

562,380Contacts tracked

201,382Verified emails

47,989Mobile numbers

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The 25 largest advisory and outsourcing services based in the United Kingdom

Ranked by team size

Top 25 of 14,019 company matches for advisory and outsourcing services based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 23, 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.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	EY	Exact match	London, United KingdomHQ recorded Sep 23, 2026	10001+	375,085 contacts →
	Exact match “EY is building a better working world by creating new value for clients, people, society, the planet, while building trust in the capital markets.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
2	Kpmg UK	Exact match	London, United KingdomHQ recorded Sep 23, 2026	10001+	14,509 contacts →
	Exact match “Make growth happen.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
3	PWC UK	Exact match	London, United KingdomHQ recorded Sep 23, 2026	10001+	11,078 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
4	BDO UK	Exact match	London, United KingdomHQ recorded Sep 23, 2026	5,001-10,000	6,933 contacts →
	Exact match “BDO LLP is an accountancy and business advisory firm that provides Audit, Tax, Deals, and Consulting, Risk & Outsourcing (CR & O) services to entrepreneurial, growing and…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
5	AZETS	Exact match	London, United KingdomHQ recorded Sep 23, 2026	5,001-10,000	5,632 contacts →
	Exact match “Azets is an international business advisory group, with local experts in 190 locations across eight countries, backed by progressive technology.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
6	Grant Thornton UK	Exact match	London, United KingdomHQ recorded Sep 23, 2026	5,001-10,000	5,509 contacts →
	Exact match “When choosing an advisor, you could accept the usual compromises.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
7	DWF	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	3,380 contacts →
	Exact match “DWF is a leading global provider of integrated legal and business services.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
8	Baringa	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	2,179 contacts →
	Exact match “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
9	Moore Global	Exact match	London, United KingdomHQ recorded Sep 23, 2026	5,001-10,000	2,047 contacts →
	Exact match “At Moore, our purpose is to help people thrive – our clients, our people and the communities they live and work in.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
10	TAX Consultant	Exact match	Brighton, United KingdomHQ recorded Sep 23, 2026	n/a	2,042 contacts →
	Exact match “A traditional general practice, with a twist.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
11	S&w	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,930 contacts →
	Exact match “As a fast growing UK accounting and advisory firm, we’ve been there, as a trusted partner, helping businesses and individuals meet challenges and seize opportunities across…” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
12	TLT LLP	Exact match	Bristol, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,797 contacts →
	Exact match “We’re your business advisers as well as your lawyers, working in step with you to protect your interests today and progress your ambitions for tomorrow.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
13	Crowe UK	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,395 contacts →
	Exact match “Crowe UK is a leading audit, tax, advisory and consulting firm with a national presence to complement our international reach.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
14	JLT Group	Exact match	London, United KingdomHQ recorded Sep 23, 2026	n/a	1,361 contacts →
	Exact match “As of April 1, 2019, JLT Group is now part of Marsh & McLennan Companies (MMC).” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
15	Barnett Waddingham	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,331 contacts →
	Exact match “We are a leading UK professional services consultancy at the forefront of risk, pensions, investment and insurance.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
16	Saffery	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,230 contacts →
	Exact match “A partner-led and people-focused top 20 accountancy firm.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
17	True Potential LLP	Exact match	Newcastle Upon Tyne, United KingdomHQ recorded Sep 23, 2026	501-1,000	1,189 contacts →
	Exact match “Through our industry leading technology and services, we power the businesses of 20% of the UK financial adviser market.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
18	Genisys Group	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,178 contacts →
	Exact match “Genisys Group is a new age global information technology and business process services company.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
19	Moore Kingston Smith	Exact match	London, United KingdomHQ recorded Sep 23, 2026	501-1,000	1,151 contacts →
	Exact match “At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
20	AAB	Exact match	Uk And Ireland, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,125 contacts →
	Exact match “We provide services that help businesses at every stage of the lifecycle.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
21	NSC Global	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,039 contacts →
	Exact match “Global business doesn’t have to be complicated.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
22	Xeinadin	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	1,001 contacts →
	Exact match “We are a leading provider of accountancy services and business advice for small and medium-sized enterprises and individuals across the UK and Ireland.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
23	TC Group	Exact match	Steyning, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	901 contacts →
	Exact match “TC Group \| 0330 088 \| At TC Group, everything we do is anchored in our purpose: shaping stronger businesses and building secure and meaningful futures.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
24	Menzies LLP	Exact match	London, United KingdomHQ recorded Sep 23, 2026	1,001-5,000	895 contacts →
	Exact match “Menzies is a proudly independent UK business advisory and accountancy practice with national coverage and international connections.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase
25	Oliver James	Exact match	Manchester, United KingdomHQ recorded Sep 23, 2026	501-1,000	870 contacts →
	Exact match “At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.” Recorded in the RevenueBase company graph · Sep 23, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “advisory and outsourcing services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 14,019 advisory and outsourcing services based in the United Kingdom

See the full list, filter by size, metro and specialty, and access 201,382 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Advisory and outsourcing services based in the United Kingdom at a glance

As of Sep 23, 2026

35.8%Verified-email coverage

8.5%Mobile-number coverage

40.1Average contacts per company

1-10Median size (employees)

35.1%Largest-city concentration · London

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

10,404

11-50

2,620

51-200

624

201-500

135

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

144,6940–30

51,90631–60

2,44561–90

31390–180

2,040180+

Company record updated

Median 74.0d

00–30

94,84631–60

301,93161–90

130,63390–180

35,256180+

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 “advisory and outsourcing services” 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 201,382 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 23, 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.

Advisory and outsourcing services 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 “advisory and outsourcing services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many advisory and outsourcing services are there based in the United Kingdom?

RevenueBase identified 14,019 company matches for advisory and outsourcing services 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?

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

Which city has the most advisory and outsourcing services?

London leads with 4915 company records, followed by Manchester (296) and Birmingham (190).

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 201,382 professional contacts with verified work emails tracked across these 14,019 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 23, 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.