Company lists · Data refreshed September 2026

Top 25 Accounting and outsourcing services worldwide

Name: Accounting and outsourcing services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 75,351 companies tracked

RevenueBase identified 75,351 accounting and outsourcing services worldwide as of September 2026 and tracks 669,323 professional contacts across them, including 228,473 with verified work emails and 77,770 with mobile numbers. The United States is the largest market and Sao Paulo the largest hub.

This list covers accounting and outsourcing services worldwide, 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 22, 2026. Country and city lists for accounting and outsourcing services follow the table.

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 22, 2026 86% judged on-target in blind review

75,351Companies

669,323Contacts tracked

228,473Verified emails

77,770Mobile numbers

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The 25 largest accounting and outsourcing services worldwide

Ranked by team size

Top 25 of 75,351 accounting and outsourcing services worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to accounting and outsourcing services: 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	MNP	Partial evidence	Calgary, AB, CanadaHQ checked Sep 22, 2026	5,001-10,000	8,773 contacts →
	Partial evidence “MNP is a leading national accounting, tax and business consulting firm in Canada.” Source: RevenueBase Database · checked Sep 22, 2026
2	BDO UK	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	6,933 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026
3	Liderança Serviços	Indirect evidence	São José, BrazilHQ checked Sep 22, 2026	10001+	4,504 contacts →
	Indirect evidence “Atuamos nos principais setores de terceirização, e somos pioneiros na implantação de contratos à distância.” Source: RevenueBase Database · checked Sep 22, 2026
4	TOA Global	Indirect evidence	Southport, AustraliaHQ checked Sep 22, 2026	1,001-5,000	3,912 contacts →
	Indirect evidence “Don’t wait until understaffing eats away at your productivity and client satisfaction.” Source: RevenueBase Database · checked Sep 22, 2026
5	In Extenso	Indirect evidence	Lyon, FranceHQ checked Sep 22, 2026	5,001-10,000	3,278 contacts →
	Indirect evidence “Crée en 1991 In Extenso est l’un des leaders de l’expertise comptable en France.” Source: RevenueBase Database · checked Sep 22, 2026
6	PWC Argentina	Indirect evidence	Comuna 1, ArgentinaHQ checked Sep 22, 2026	5,001-10,000	3,042 contacts →
	Indirect evidence “Somos parte de una red global de firmas, presente en 136 países y más de talentos comprometidos a brindar servicios de calidad en auditoría, consultoría, asesoramiento impositivo…” Source: RevenueBase Database · checked Sep 22, 2026
7	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 22, 2026
8	S&w	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,930 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026
9	BDO South Africa	Indirect evidence	Johannesburg, South AfricaHQ checked Sep 22, 2026	1,001-5,000	1,870 contacts →
	Indirect evidence “Audit \| Advisory \| Tax The South African member firm of BDO International - The Leader for Exceptional Client Service since 1963 BDO clients experience a distinctive level of…” Source: RevenueBase Database · checked Sep 22, 2026
10	BDO Brazil	Indirect evidence	Sp, BrazilHQ checked Sep 22, 2026	1,001-5,000	1,791 contacts →
	Indirect evidence “Presidida por Raul Corrêa da Silva, a BDO RCS foi fundada em 2001 e desde então mantém participação expressiva no mercado de auditorias.” Source: RevenueBase Database · checked Sep 22, 2026
11	Grant Thornton Sweden	Indirect evidence	Stockholm, SwedenHQ checked Sep 22, 2026	1,001-5,000	1,724 contacts →
	Indirect evidence “Grant Thornton är ett ledande revisions- och rådgivningsföretag med över 1400 medarbetare som erbjuder tjänster inom revision, skatt, redovisning och specialistrådgivning.” Source: RevenueBase Database · checked Sep 22, 2026
12	Kpmg Poland	Indirect evidence	Warsaw, PolandHQ checked Sep 22, 2026	1,001-5,000	1,696 contacts →
	Indirect evidence “KPMG jest globalną organizacją niezależnych firm świadczących profesjonalne usługi z zakresu audytu, doradztwa podatkowego, finansowego, prawnego oraz consultingu.” Source: RevenueBase Database · checked Sep 22, 2026
13	Grant Thornton Australia	Indirect evidence	Sydney, AustraliaHQ checked Sep 22, 2026	1,001-5,000	1,626 contacts →
	Indirect evidence “Your business deserves remarkable support.” Source: RevenueBase Database · checked Sep 22, 2026
14	BDO Germany	Indirect evidence	Hamburg, GermanyHQ checked Sep 22, 2026	1,001-5,000	1,576 contacts →
	Indirect evidence “BDO is the leading entrepreneurial driven provider for audit and audit-related services, tax and business law consulting as well as advisory services.” Source: RevenueBase Database · checked Sep 22, 2026
15	Beierholm	Indirect evidence	Aalborg, DenmarkHQ checked Sep 22, 2026	1,001-5,000	1,568 contacts →
	Indirect evidence “Beierholm is the preferred auditing and consulting company for small and medium-sized companies in Denmark.” Source: RevenueBase Database · checked Sep 22, 2026
16	BDO Norge	Indirect evidence	Oslo, NorwayHQ checked Sep 22, 2026	1,001-5,000	1,530 contacts →
	Indirect evidence “We see great value in having a local presence and roots, factors which enable us to work closely with our clients.” Source: RevenueBase Database · checked Sep 22, 2026
17	RSM Ebner Stolz	Indirect evidence	Stuttgart, GermanyHQ checked Sep 22, 2026	1,001-5,000	1,442 contacts →
	Indirect evidence “Wollen Sie jemanden, der Sie auch beim Sprung in neue Märkte und bei allen anstehenden Herausforderungen begleitet?” Source: RevenueBase Database · checked Sep 22, 2026
18	Grant Thornton Greece	Indirect evidence	Athens, GreeceHQ checked Sep 22, 2026	1,001-5,000	1,313 contacts →
	Indirect evidence “Grant Thornton SA provides personalised assurance, tax and advisory services to listed entities, privately-held businesses and public sector businesses.” Source: RevenueBase Database · checked Sep 22, 2026
19	ASPIA	Indirect evidence	Stockholm, SwedenHQ checked Sep 22, 2026	1,001-5,000	1,280 contacts →
	Indirect evidence “Aspia är Nordeuropas ledande affärspartner för företag som vill ta nästa steg.” Source: RevenueBase Database · checked Sep 22, 2026
20	Saffery	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,230 contacts →
	Indirect evidence “A partner-led and people-focused top 20 accountancy firm.” Source: RevenueBase Database · checked Sep 22, 2026
21	AAB	Indirect evidence	Uk And Ireland, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,125 contacts →
	Indirect evidence “We provide services that help businesses at every stage of the lifecycle.” Source: RevenueBase Database · checked Sep 22, 2026
22	Moore Belgium	Partial evidence	Brussels, BelgiumHQ checked Sep 22, 2026	1,001-5,000	1,087 contacts →
	Partial evidence “Moore Belgium is het grootste onafhankelijke accounting- en consulting bedrijf in België dat ondernemers helpt hun droom te realiseren.” Source: RevenueBase Database · checked Sep 22, 2026
23	COGEP	Indirect evidence	Saint-doulchard, FranceHQ checked Sep 22, 2026	1,001-5,000	1,051 contacts →
	Indirect evidence “Une vision augmentée du conseil au service de votre réussite.” Source: RevenueBase Database · checked Sep 22, 2026
24	Xeinadin	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	1,001-5,000	1,001 contacts →
	Indirect evidence “We are a leading provider of accountancy services and business advice for small and medium-sized enterprises and individuals across the UK and Ireland.” Source: RevenueBase Database · checked Sep 22, 2026
25	BDO Belgium	Indirect evidence	Zaventem, BelgiumHQ checked Sep 22, 2026	1,001-5,000	936 contacts →
	Indirect evidence “At BDO, we believe in empowering organisations and people to achieve sustainable growth and realise their full potential.” Source: RevenueBase Database · checked Sep 22, 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: accounting and outsourcing services. 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 accounting and outsourcing services.
Partial evidence: Its own public description names part of accounting and outsourcing services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name accounting and outsourcing services. 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 75,351 accounting and outsourcing services worldwide

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Accounting and outsourcing services worldwide at a glance

As of Sep 22, 2026

34.1%Verified-email coverage

11.6%Mobile-number coverage

8.9Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

51,071

11-50

19,473

51-200

3,296

201-500

561

501-1,000

191

1,001-5,000

146

5,001-10,000

10001+

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 accounting and outsourcing services, 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.
Coverage: 42 countries, largest first: the United States, Brazil, the United Kingdom, France, Australia, Canada, Italy, the Netherlands, Spain, Germany and 32 more. Country and city lists for accounting and outsourcing services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “accounting and outsourcing services”. 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 accounting and outsourcing services), 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 accounting and outsourcing services, and records with no verified work email.
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, 228,473 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 22, 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.

Accounting and outsourcing services by location

331 lists · largest first

Every Accounting and outsourcing services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 accounting and outsourcing services, 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 accounting and outsourcing services are there worldwide?

RevenueBase identified 75,351 accounting and outsourcing services worldwide 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?

MNP, headquartered in Calgary, tops this list with the largest team on record.

Which country has the most accounting and outsourcing services?

The United States leads with 20,265 companies, followed by Brazil (13,725) and the United Kingdom (7,654). Every accounting and outsourcing services list by country and city is linked on this page.

Which city has the most accounting and outsourcing services?

Sao Paulo leads with 2329 headquartered companies, followed by London (1571) and Rio De Janeiro (654).

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 228,473 verified decision-maker contacts tracked across these 75,351 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 22, 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.