Company lists · Data refreshed September 2026

Top 25 Outsourcing advisory firms based in London, United Kingdom

Name: Outsourcing advisory firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 880 companies tracked

RevenueBase identified 880 outsourcing advisory firms headquartered in London, United Kingdom as of September 2026 and tracks 6,481 professional contacts across them, including 2,725 with verified work emails. London is the largest hub.

This list covers outsourcing advisory firms headquartered in London, 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 21, 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 21, 2026 86% judged on-target in blind review

880Companies

6,481Contacts tracked

2,725Verified emails

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The 25 largest outsourcing advisory firms based in London, United Kingdom

Ranked by team size

Top 25 of 880 outsourcing advisory firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to outsourcing advisory 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	FRP Advisory	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	731 contacts →
	Partial evidence “FRP is a leading national business advisory firm.” Source: RevenueBase Database · checked Sep 21, 2026
2	Ubique Systems	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	333 contacts →
	Partial evidence “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Source: RevenueBase Database · checked Sep 21, 2026
3	SKS Business Services	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	322 contacts →
	Indirect evidence “At SKS, we pride ourselves on being different.” Source: RevenueBase Database · checked Sep 21, 2026
4	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 21, 2026
5	Quantuma	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	277 contacts →
	Partial evidence “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Source: RevenueBase Database · checked Sep 21, 2026
6	Opus Business Advisory Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	144 contacts →
	Partial evidence “Opus Business Advisory Group is an independent advisory firm that assists clients to achieve their objectives, enhance value and attain the best possible results.” Source: RevenueBase Database · checked Sep 21, 2026
7	Athens	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	122 contacts →
	Indirect evidence “Athens helps clients make superior investment decisions and supports them to deliver value from these decisions through timely implementation.” Source: RevenueBase Database · checked Sep 21, 2026
8	Norman Broadbent PLC	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	86 contacts →
	Partial evidence “As a leading Professional Services firm, we offer five interrelated Talent Acquisition & Advisory Services to help Boards with the challenges they face.” Source: RevenueBase Database · checked Sep 21, 2026
9	SI Global	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	79 contacts →
	Indirect evidence “We are SI Global.” Source: RevenueBase Database · checked Sep 21, 2026
10	Eden Mccallum	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	75 contacts →
	Indirect evidence “We redefined management consulting to make it better for clients and better for consultants.” Source: RevenueBase Database · checked Sep 21, 2026
11	Erevena	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	73 contacts →
	Partial evidence “Erevena is the global executive search advisor to the world's most ambitious tech companies.” Source: RevenueBase Database · checked Sep 21, 2026
12	Eight Advisory UK	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	501-1,000	71 contacts →
	Partial evidence “Eight Advisory is an independent advisory firm specialising in transactions, restructuring and transformation.” Source: RevenueBase Database · checked Sep 21, 2026
13	Camelot	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	66 contacts →
	Indirect evidence “We are a network of independent consultants who are ex-C-Suite Execs/Senior Managers who have all been there and done it in top organisations, mainly in insurance but others as…” Source: RevenueBase Database · checked Sep 21, 2026
14	Fusion Consulting Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	62 contacts →
	Partial evidence “Fusion is a multi-disciplinary consulting firm that offers 360 degree advisory services and end-to-end solutions for private individuals and fast growth businesses.” Source: RevenueBase Database · checked Sep 21, 2026
15	Collingwood	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	59 contacts →
	Partial evidence “Collingwood is the only growth, value creation, and M&A advisory that is purpose-built to help information, media, and events businesses create and realise shareholder value.” Source: RevenueBase Database · checked Sep 21, 2026
16	POE Advisory	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	45 contacts →
	Indirect evidence “Three practice areas built for the demands of PE, family offices, asset managers, investors and portfolio businesses.” Source: RevenueBase Database · checked Sep 21, 2026
17	EOS Deal Advisory	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	42 contacts →
	Partial evidence “At EOS Deal Advisory, our focus is to provide our clients with targeted advice that focusses on driving future value, leverages evolving technologies, and ensures operational…” Source: RevenueBase Database · checked Sep 21, 2026
18	Factotum	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	41 contacts →
	Indirect evidence “Welcome to Factotum-your secret weapon for streamlined business success!” Source: RevenueBase Database · checked Sep 21, 2026
19	Inforom	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	38 contacts →
	Indirect evidence “Inforom Consultancy Services helps companies expand, strengthen and launch Internationally.” Source: RevenueBase Database · checked Sep 21, 2026
20	Carisbrook Partners	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	36 contacts →
	Partial evidence “Carisbrook Partners is a financial services search and advisory firm focused on the acquisition of talent for Investment Banking, Hedge Fund, Asset Management, Global Custody and…” Source: RevenueBase Database · checked Sep 21, 2026
21	Dragon Argent	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Indirect evidence “Dragon Argent believes that with expert and entrepreneurial professional advice, every business can realise its potential.” Source: RevenueBase Database · checked Sep 21, 2026
22	Global Business Research GBR	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Partial evidence “GBR is a full-service international B2B research and business advisory firm headquartered in London.” Source: RevenueBase Database · checked Sep 21, 2026
23	DD Consulting	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	n/a	32 contacts →
	Indirect evidence “DD Consulting is a boutique consulting house specialising in M&A, integration and separation, taking all those skills into day-to-day business operations.” Source: RevenueBase Database · checked Sep 21, 2026
24	Adaptive Business Group	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	29 contacts →
	Partial evidence “Adaptive Business Group serves an international client base via recruitment and M&A advisory teams across our offices in London, New York, San Diego, Singapore and Berlin.” Source: RevenueBase Database · checked Sep 21, 2026
25	PRECA	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	28 contacts →
	Partial evidence “PrECA: Procurement Excellence for Competitive Advantage We offer procurement consulting and outsourcing services to medium and large companies.” Source: RevenueBase Database · checked Sep 21, 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: outsourcing advisory 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 outsourcing advisory firms.
Partial evidence: Its own public description names part of outsourcing advisory firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name outsourcing advisory 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 880 outsourcing advisory firms based in London, United Kingdom

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Outsourcing advisory firms based in London, United Kingdom at a glance

As of Sep 21, 2026

42.0%Verified-email coverage

7.4Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

641

11-50

174

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 880 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 outsourcing advisory 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 London, United Kingdom whose own description of what they do matches “outsourcing advisory 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 outsourcing advisory 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 outsourcing advisory firms, and records with no verified work email. Companies headquartered outside London 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, 2,725 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 21, 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.

Outsourcing advisory firms by metro in the United Kingdom

Outsourcing advisory firms in London880
Outsourcing advisory firms in Manchester40
Outsourcing advisory firms in Bristol27

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 outsourcing advisory 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 outsourcing advisory firms are there based in London, United Kingdom?

RevenueBase identified 880 outsourcing advisory firms headquartered in London, 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?

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

Which city has the most outsourcing advisory firms?

London leads with 880 headquartered companies, followed by Manchester (40) and Bristol (27).

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 2,725 verified decision-maker contacts tracked across these 880 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 21, 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.