Company lists · Data refreshed September 2026

Top 25 Big 5 audit firms worldwide

Name: Big 5 audit firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 29,109 companies tracked

RevenueBase identified 29,109 company matches for big 5 audit firms worldwide as of September 2026 and tracks 2,223,417 professional contacts across them, including 744,046 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for big 5 audit firms worldwide, 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 21, 2026. Country and city lists for big 5 audit firms follow the table.

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 21, 2026 How this list was built

29,109Companies

2,223,417Contacts tracked

744,046Verified emails

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The 25 largest big 5 audit firms worldwide

Ranked by team size

Top 25 of 29,109 company matches for big 5 audit firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Deloitte	Exact match	United StatesHQ recorded Sep 21, 2026	10001+	480,083 contacts →
	Exact match “Deloitte drives progress.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	EY	Exact match	London, United KingdomHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
3	PWC	Exact match	London, NY, United KingdomHQ recorded Sep 21, 2026	10001+	173,408 contacts →
	Exact match “At PwC, we help clients drive their companies to the leading edge.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	KPMG	Exact match	Berlin, SwitzerlandHQ recorded Sep 21, 2026	10001+	68,443 contacts →
	Exact match “KPMG is a global organization of independent professional services firms providing Audit, Tax and Advisory services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Kpmg India	Exact match	Gurugram, IndiaHQ recorded Sep 21, 2026	10001+	28,997 contacts →
	Exact match “KPMG entities in India are established under the laws of India and are owned and managed (as the case may be) by established Indian professionals.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	PWC India	Exact match	Kolkata, IndiaHQ recorded Sep 21, 2026	10001+	26,651 contacts →
	Exact match “At PwC, we help clients build trust and reinvent so they can turn complexity into competitive advantage.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	PWC UK	Exact match	London, United KingdomHQ recorded Sep 21, 2026	10001+	11,078 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Baker Tilly US	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	10001+	10,534 contacts →
	Exact match “Baker Tilly is a leading advisory, tax and assurance firm, providing clients with a genuine coast-to-coast and global advantage in major regions of the U.S.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	PWC Deutschland	Exact match	Frankfurt Am Main, GermanyHQ recorded Sep 21, 2026	10001+	10,357 contacts →
	Exact match “PwC is the leading auditing and consulting company in Germany.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	BDO USA	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	10001+	10,078 contacts →
	Exact match “At BDO, our success is measured by what we achieve together.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	CLA Cliftonlarsonallen	Exact match	Bellevue, WA, United StatesHQ recorded Sep 21, 2026	5,001-10,000	9,567 contacts →
	Exact match “CLA exists to create opportunities for our clients, our people, and our communities through industry-focused wealth advisory, outsourcing, audit, tax, and consulting services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Kpmg Australia	Exact match	Sydney, AustraliaHQ recorded Sep 21, 2026	5,001-10,000	9,024 contacts →
	Exact match “Welcome to KPMG.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Grant Thornton Bharat LLP	Exact match	New Delhi, IndiaHQ recorded Sep 21, 2026	10001+	8,807 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Protiviti	Exact match	Menlo Park, CA, United StatesHQ recorded Sep 21, 2026	5,001-10,000	8,779 contacts →
	Exact match “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	MNP	Exact match	Calgary, AB, CanadaHQ recorded Sep 21, 2026	5,001-10,000	8,773 contacts →
	Exact match “MNP is a leading national accounting, tax and business consulting firm in Canada.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	CROWE	Exact match	Chicago, IL, United StatesHQ recorded Sep 21, 2026	5,001-10,000	8,390 contacts →
	Exact match “Crowe provides professional services through two separate entities: Crowe LLP delivers audit and attest services, and Crowe Advisory LLC provides tax, advisory, consulting, and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	BDO UK	Exact match	London, United KingdomHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
18	Mazars	Exact match	Paris La Defense, FranceHQ recorded Sep 21, 2026	10001+	6,485 contacts →
	Exact match “Mazars is an internationally integrated partnership, specialising in audit, accountancy, advisory, tax and legal services*.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	CBIZ	Exact match	Independence, OH, United StatesHQ recorded Sep 21, 2026	10001+	6,369 contacts →
	Exact match “CBIZ, Inc.(NYSE: CBZ) is a leading professional services advisor to middle-market businesses nationwide.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	BDO India	Exact match	Mumbai, IndiaHQ recorded Sep 21, 2026	5,001-10,000	6,148 contacts →
	Exact match “BDO India is the Indian member firm of BDO, the world’s fifth-largest professional services organisation, operating in 166 countries and territories with a team of over…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Kpmg France	Exact match	Paris La Défense, FranceHQ recorded Sep 21, 2026	10001+	5,839 contacts →
	Exact match “Leader de l'audit, du conseil et de l'expertise comptable, KPMG France est membre de KPMG International, réseau de cabinets indépendants exerçant dans 155 pays.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	SGV & CO	Exact match	Makati City, PhilippinesHQ recorded Sep 21, 2026	5,001-10,000	5,764 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Kpmg Brazil	Exact match	Sao Paulo, BrazilHQ recorded Sep 21, 2026	1,001-5,000	5,551 contacts →
	Exact match “A KPMG opera como uma rede internacional de firmas-membro que oferecem serviços nas áreas de Audit, Tax e Advisory.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Grant Thornton UK	Exact match	London, United KingdomHQ recorded Sep 21, 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 21, 2026 · View company records in RevenueBase
25	BDO Canada	Exact match	Toronto, ON, CanadaHQ recorded Sep 21, 2026	1,001-5,000	4,833 contacts →
	Exact match “Canada’s Top 100 Employers 2025 I 2024 I 2023 I 2022 BDO Canada LLP is a leading provider of professional services to clients across a variety of sectors and segments.” Recorded in the RevenueBase company graph · Sep 21, 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 “big 5 audit firms”. 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 29,109 big 5 audit firms worldwide

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Big 5 audit firms worldwide at a glance

As of Sep 21, 2026

33.5%Verified-email coverage

76.4Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · Sao Paulo

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

13,257

11-50

11,301

51-200

3,035

201-500

723

501-1,000

236

1,001-5,000

287

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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.
Coverage: Every country. Country and city lists for big 5 audit firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “big 5 audit 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. 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 744,046 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 21, 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.

Big 5 audit firms by location

171 lists · largest first

Every Big 5 audit firms 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 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 “big 5 audit firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many big 5 audit firms are there worldwide?

RevenueBase identified 29,109 company matches for big 5 audit firms worldwide 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?

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

Which country has the most big 5 audit firms?

The United States leads with 5,062 companies, followed by Brazil (2,777) and India (2,438). Every big 5 audit firms list by country and city is linked on this page.

Which city has the most big 5 audit firms?

Sao Paulo leads with 512 company records, followed by Paris (331) and London (326).

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 744,046 professional contacts with verified work emails tracked across these 29,109 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 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 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.