Company lists · Data refreshed September 2026

Top 25 Audit and assurance consulting firms based in Switzerland

RevenueBase identified 130 company matches for audit and assurance consulting firms associated with Switzerland as of September 2026 and tracks 2,066 professional contacts across them, including 1,041 with verified work emails. Zurich is the largest hub.

This list covers company matches for audit and assurance consulting firms associated with Switzerland, 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 27, 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 27, 2026 How this list was built
130Companies
2,066Contacts tracked
1,041Verified emails
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The 25 largest audit and assurance consulting firms based in Switzerland

Ranked by team size
Top 25 of 130 company matches for audit and assurance consulting firms based in Switzerland, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 27, 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.
#CompanyRevenueBase SmartSearchHeadquartersEmployeesContacts
1Exact matchZürich, SwitzerlandHQ recorded Sep 27, 20261,001-5,0001,090 contacts →

Exact match

“BDO is one of the leading audit, accounting and consulting firms in Switzerland.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
2Exact matchSchwyz, SwitzerlandHQ recorded Sep 27, 202651-20062 contacts →

Exact match

“Die Treuhand- und Revisionsgesellschaft Mattig-Suter und Partner (MSuP) wurde am 1.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
3Exact matchBern, SwitzerlandHQ recorded Sep 27, 202651-20046 contacts →

Exact match

“Für unsere Kunden generieren wir Mehrwert durch professionelle und individuelle Dienstleistungen auf der Basis von persönlichen Beziehungen in den Bereichen Treuhand…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
4Exact matchZürich, SwitzerlandHQ recorded Sep 27, 202651-20034 contacts →

Exact match

“Swiss legal service provider.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
5Exact matchBasel, SwitzerlandHQ recorded Sep 27, 202611-5022 contacts →

Exact match

“Ganz persönlich und alles aus einer Hand: Treuhand, Steuern, Wirtschaftsprüfung und Unternehmensberatung.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
6Exact matchZurich, SwitzerlandHQ recorded Sep 27, 2026n/a22 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 27, 2026 · View company records in RevenueBase
7Exact matchStadtkreis 8 Riesbach, SwitzerlandHQ recorded Sep 27, 202611-5020 contacts →

Exact match

“We have been acknowledged as an independent, flexible and trustworthy consulting firm since 1946.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
8Exact matchLausanne, SwitzerlandHQ recorded Sep 27, 202611-5020 contacts →

Exact match

“Depuis plus de 30 années, Fidexaudit accompagne ses clients dans tous les domaines de la fiduciaire.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
9Exact matchSiebnen, SwitzerlandHQ recorded Sep 27, 202651-20017 contacts →

Exact match

“KMU Treuhand & Revision – für Sie da.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
10Exact matchWinterthur, SwitzerlandHQ recorded Sep 27, 202611-5017 contacts →

Exact match

“Consultive ist Ihr KMU Partner für Revision, Treuhand und Unternehmensberatung in Winterthur.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
11Exact matchLangenthal, SwitzerlandHQ recorded Sep 27, 202611-5017 contacts →

Exact match

“Gfeller + Partner AG ist ein mittelständisches Dienstleistungsunternehmen, welches Wirtschaftsprüfungs, Steuer- und Beratungsdienstleistungen anbietet.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
12Exact matchBasel, SwitzerlandHQ recorded Sep 27, 202611-5014 contacts →

Exact match

“Wir entwickeln für Sie individuelle und auf Ihre Bedürfnisse angepasste Lösungen in den Bereichen Treuhand, Wirtschaftsprüfung, Steuern und Unternehmensberatung- Treuhand: Wir…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
13Exact matchBiel/bienne, SwitzerlandHQ recorded Sep 27, 202611-5014 contacts →

Exact match

“Wir sind seit über 100 Jahren in den Bereichen Treuhand, Wirtschaftsprüfung, Unternehmens- und Steuerberatung tätig.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
14Exact matchZürich, SwitzerlandHQ recorded Sep 27, 202611-5011 contacts →

Exact match

“Lenz Treuhand AG is an accounting company based out of Seefeldstrasse 35, Zürich, Canton of Zurich, Switzerland.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
15Exact matchStadtkreis 3 Wiedikon, SwitzerlandHQ recorded Sep 27, 202611-5010 contacts →

Exact match

“Ostschweizerische Treuhand Zürich AG, short OTG, has been in business since 1918 as an accredited audit firm conducting full and limited audits.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
16Exact matchLugano, SwitzerlandHQ recorded Sep 27, 202611-5010 contacts →

Exact match

“PKF Certifica SA is an auditing and corporate consultancy company that is a full member of the PKF global network, counting over 200 member firms in around 150 countries across…”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
17Exact matchZofingen, SwitzerlandHQ recorded Sep 27, 202611-509 contacts →

Exact match

“We are independent auditors, tax advisors and accountants.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
18Exact matchBasel, SwitzerlandHQ recorded Sep 27, 202611-509 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
19Exact matchZürich, SwitzerlandHQ recorded Sep 27, 202611-509 contacts →

Exact match

“CONTROVA AG was founded in 2004 in Zug as BCS Audit AG and renamed CONTROVA AG in 2012.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
20Exact matchAarau, SwitzerlandHQ recorded Sep 27, 202611-509 contacts →

Exact match

“Die Expertinnen und Experten von Gruber Partner in Aarau schaffen Klarheit.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
21Exact matchLugano, SwitzerlandHQ recorded Sep 27, 20261-108 contacts →

Exact match

Recorded description not available.

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
22Exact matchArlesheim, SwitzerlandHQ recorded Sep 27, 20261-108 contacts →

Exact match

“Das Team der Birseck-Treuhand AG heisst Sie herzlich willkommen!”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
23Exact matchBaden, SwitzerlandHQ recorded Sep 27, 202611-508 contacts →

Exact match

“We have over fourty years experience in the fields of auditing, tax consulting, aspects of accounting services and management consultancy.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
24Exact matchOlten, SwitzerlandHQ recorded Sep 27, 20261-108 contacts →

Exact match

“Unser Unternehmen bietet hoch stehende Dienstleistungen in den Bereichen Wirtschaftsprüfung, Buchführung und Abschlussberatung sowie Steuer- und Unternehmensberatung an.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase
25Exact matchLuzern, SwitzerlandHQ recorded Sep 27, 20261-107 contacts →

Exact match

“Die Lufida-Revision stellt Unternehmen aus allen Branchen ihre Dienstleistungen als unabhängiges und flexibles Wirtschaftsprüfungs- und Beratungsunternehmen zur Verfügung.”

Recorded in the RevenueBase company graph · Sep 27, 2026 · View company records in RevenueBase

Showing 25 of 130 audit and assurance consulting firms based in Switzerland

See the full list, filter by size, metro and specialty, and access 1,041 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Audit and assurance consulting firms based in Switzerland at a glance

As of Sep 27, 2026
50.4%Verified-email coverage
15.9Average contacts per company
1-10Median size (employees)
12.3%Largest-city concentration · Zurich
Sep 27, 2026Page data refreshed

Companies by employee count

1-10
89
11-50
31
51-200
5
201-500
1
1,001-5,000
1
5,001-10,000
1

Email recency for this list is measured worldwide rather than for Switzerland, so it is reported there. Company counts and contact totals on this page are exact for Switzerland, over 130 companies.

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 Switzerland whose business descriptions match “audit and assurance consulting 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. 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 1,041 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 27, 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.

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 “audit and assurance consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many audit and assurance consulting firms are there based in Switzerland?

RevenueBase identified 130 company matches for audit and assurance consulting firms associated with Switzerland 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?

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

Which city has the most audit and assurance consulting firms?

Zurich leads with 16 company records, followed by Zug (7) and Basel (5).

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 1,041 professional contacts with verified work emails tracked across these 130 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 27, 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.