Company lists · Data refreshed September 2026

Top 25 Audit defense firms worldwide

Name: Audit defense firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 22,328 companies tracked

RevenueBase identified 22,328 audit defense firms worldwide as of September 2026 and tracks 172,891 professional contacts across them, including 50,026 with verified work emails. Germany is the largest market and Sao Paulo the largest hub.

This list covers audit defense firms 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 30, 2026. Country and city lists for audit defense firms 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 30, 2026 86% judged on-target in blind review

22,328Companies

172,891Contacts tracked

50,026Verified emails

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The 25 largest audit defense firms worldwide

Ranked by team size

Top 25 of 22,328 audit defense firms worldwide, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to audit defense 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	RYAN	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 30, 2026	5,001-10,000	6,089 contacts →
	Indirect evidence “Ryan, an award-winning global tax services and software provider, is the largest Firm in the world dedicated exclusively to business taxes.” Source: RevenueBase Database · checked Sep 30, 2026
2	TAX Consultant	Indirect evidence	Brighton, United KingdomHQ checked Sep 30, 2026	n/a	2,042 contacts →
	Indirect evidence “A traditional general practice, with a twist.” Source: RevenueBase Database · checked Sep 30, 2026
3	Grant Thornton Sweden	Indirect evidence	Stockholm, SwedenHQ checked Sep 30, 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 30, 2026
4	BDO Germany	Partial evidence	Hamburg, GermanyHQ checked Sep 30, 2026	1,001-5,000	1,576 contacts →
	Partial 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 30, 2026
5	BDO In Indonesia	Indirect evidence	Jakarta, IndonesiaHQ checked Sep 30, 2026	501-1,000	1,508 contacts →
	Indirect evidence “BDO is the leading provider of professional services within the mid-tier of our profession.” Source: RevenueBase Database · checked Sep 30, 2026
6	RSM Ebner Stolz	Indirect evidence	Stuttgart, GermanyHQ checked Sep 30, 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 30, 2026
7	WTS Deutschland	Indirect evidence	Munich, GermanyHQ checked Sep 30, 2026	1,001-5,000	882 contacts →
	Indirect evidence “WTS ist ein globaler Full-Service Anbieter für Steuerberatungsleistungen und Financial & Deal Advisory.” Source: RevenueBase Database · checked Sep 30, 2026
8	DMA	Indirect evidence	Fort Wayne, IN, United StatesHQ checked Sep 30, 2026	501-1,000	861 contacts →
	Indirect evidence “Great Place to Work® Certified™ DMA, a proudly employee-owned company, has been solving corporate tax challenges for its clients since 1972.” Source: RevenueBase Database · checked Sep 30, 2026
9	PWC Hungary	Indirect evidence	Budapest, HungaryHQ checked Sep 30, 2026	501-1,000	749 contacts →
	Indirect evidence “A PwC Magyarország közel három évtizede nyújt ügyfeleinek nemzetközi színvonalú szolgáltatást könyvvizsgálat, adótanácsadás és üzleti tanácsadás területeken.” Source: RevenueBase Database · checked Sep 30, 2026
10	Chevez Ruiz Zamarripa	Indirect evidence	Mexico City, MexicoHQ checked Sep 30, 2026	501-1,000	683 contacts →
	Indirect evidence “Chevez Ruiz Zamarripa, es una firma especializada en la Asesoría y Consultoría Fiscal de alto nivel, que se distingue por prestar servicios personalizados con total…” Source: RevenueBase Database · checked Sep 30, 2026
11	Kpmg Avocats	Indirect evidence	Courbevoie, FranceHQ checked Sep 30, 2026	501-1,000	669 contacts →
	Indirect evidence “Les entreprises de toutes tailles sont exposées à des dispositions de plus en plus complexes en matière de réglementations fiscales et juridiques sur leur territoire national et…” Source: RevenueBase Database · checked Sep 30, 2026
12	Flick Gocke Schaumburg	Indirect evidence	Bonn, GermanyHQ checked Sep 30, 2026	501-1,000	651 contacts →
	Indirect evidence “Flick Gocke Schaumburg is an independent partnership of lawyers, tax advisors and auditors working with more than 320 professionals from offices in Berlin, Bonn, Düsseldorf…” Source: RevenueBase Database · checked Sep 30, 2026
13	BDO Austria	Indirect evidence	Vienna, AustriaHQ checked Sep 30, 2026	1,001-5,000	599 contacts →
	Indirect evidence “Holen Sie sich eine Datenschutzzertifizierung für Ihr Unternehmen.” Source: RevenueBase Database · checked Sep 30, 2026
14	BDO Israel	Indirect evidence	Tel Aviv, IsraelHQ checked Sep 30, 2026	1,001-5,000	574 contacts →
	Indirect evidence “BDO Israel is a dynamic and business oriented accounting and consulting firm, ranking amongst the five leading industry firms in Israel and part of the international network BDO.” Source: RevenueBase Database · checked Sep 30, 2026
15	Bennett Thrasher	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 30, 2026	201-500	558 contacts →
	Partial evidence “Bennett Thrasher provides proven guidance for financial confidence through premier tax, audit, advisory, and outsourcing solutions.” Source: RevenueBase Database · checked Sep 30, 2026
16	Lisicki Litvin & Asociados	Indirect evidence	Buenos Aires, ArgentinaHQ checked Sep 30, 2026	501-1,000	553 contacts →
	Indirect evidence “Somos una firma de profesionales altamente especializados y comprometidos con las necesidades de nuestros clientes.” Source: RevenueBase Database · checked Sep 30, 2026
17	K C Mehta & CO LLP	Indirect evidence	Vadodara, IndiaHQ checked Sep 30, 2026	201-500	504 contacts →
	Indirect evidence “K C Mehta & Co LLP (KCM) is a team of passionate professionals.” Source: RevenueBase Database · checked Sep 30, 2026
18	Sensiba LLP	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 30, 2026	501-1,000	493 contacts →
	Indirect evidence “Sensiba’s comprehensive accounting, tax, and consulting services help businesses and people solve problems, navigate complexity, and build a foundation for sustainable growth.” Source: RevenueBase Database · checked Sep 30, 2026
19	MAPAH	Indirect evidence	Goiânia, BrazilHQ checked Sep 30, 2026	201-500	475 contacts →
	Indirect evidence “Nosso principal Foco: RESULTADO Nosso compromisso é identificar problemas, sua origem e causa, culminando na divulgação das consequências que estes pontos podem gerar para a…” Source: RevenueBase Database · checked Sep 30, 2026
20	DHPG	Partial evidence	Bonn, GermanyHQ checked Sep 30, 2026	1,001-5,000	460 contacts →
	Partial evidence “As an interdisciplinary medium-sized tax audit, accountancy and legal advice service we guarantee all-round high-quality consultation combined with a personal component.” Source: RevenueBase Database · checked Sep 30, 2026
21	Smith Howard	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 30, 2026	501-1,000	413 contacts →
	Indirect evidence “Smith + Howard is a tax, accounting, advisory, and consulting firm headquartered in Atlanta, with a global presence.” Source: RevenueBase Database · checked Sep 30, 2026
22	Dhruva Advisors India Pvt. LTD	Indirect evidence	Mumbai, IndiaHQ checked Sep 30, 2026	501-1,000	408 contacts →
	Indirect evidence “Dhruva Advisors, a Ryan LLC affiliate, delivers strategic tax and regulatory solutions to clients across India and around the world.” Source: RevenueBase Database · checked Sep 30, 2026
23	CRIDO	Indirect evidence	Warsaw, PolandHQ checked Sep 30, 2026	201-500	407 contacts →
	Indirect evidence “We are a leading Polish consulting firm committed to helping businesses make informed decisions.” Source: RevenueBase Database · checked Sep 30, 2026
24	Sistem Global Danışmanlık A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 30, 2026	501-1,000	384 contacts →
	Indirect evidence “Sistem Group has been founded in 1996 and has more than 170 employees in the group offices in Ankara, İstanbul, Adana, Bursa, Gaziantep and İzmir.” Source: RevenueBase Database · checked Sep 30, 2026
25	BDO México	Indirect evidence	Cuauhtémoc, MexicoHQ checked Sep 30, 2026	501-1,000	367 contacts →
	Indirect evidence “Somos la quinta firma de contadores públicos y consultores de negocio a nivel mundial, proporcionamos los servicios profesionales de Auditoría; Impuestos y Consultoría Fiscal…” Source: RevenueBase Database · checked Sep 30, 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: audit defense 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 audit defense firms.
Partial evidence: Its own public description names part of audit defense firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name audit defense 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 22,328 audit defense firms worldwide

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Audit defense firms worldwide at a glance

As of Sep 30, 2026

28.9%Verified-email coverage

7.7Average contacts per company

1-10Median size (employees)

2.9%Largest-city concentration · Sao Paulo

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

12,913

11-50

7,546

51-200

1,266

201-500

194

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 audit defense 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.
Coverage: Every country. Country and city lists for audit defense firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “audit defense 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 audit defense 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 audit defense firms, 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, 50,026 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 30, 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.

Audit defense firms by location

112 lists · largest first

Every Audit defense 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 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 audit defense 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 audit defense firms are there worldwide?

RevenueBase identified 22,328 audit defense firms 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?

RYAN, headquartered in Dallas, tops this list with the largest team on record.

Which country has the most audit defense firms?

Germany leads with 3,568 companies, followed by Brazil (2,714) and the United States (2,609). Every audit defense firms list by country and city is linked on this page.

Which city has the most audit defense firms?

Sao Paulo leads with 637 headquartered companies, followed by Berlin (188) and Madrid (182).

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 50,026 verified decision-maker contacts tracked across these 22,328 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 30, 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.