Company lists · Data refreshed August 2026

Top 25 Accounting firms for international nonprofits based in Switzerland

Name: Accounting firms for international nonprofits based in Switzerland
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 30, 2026 248 companies tracked

There are 248 accounting firms for international nonprofits headquartered in Switzerland (RevenueBase, August 2026). RevenueBase tracks 2,717 professional contacts across them, including 1,389 with verified work emails and 45 with mobile numbers. Zurich is the largest hub.

This list covers accounting firms for international nonprofits headquartered in Switzerland, 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, how directly it supports the match, and when it was last checked. Data refreshed August 30, 2026.

248Companies

2,717Contacts tracked

1,389Verified emails

45Mobile numbers

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The 25 largest accounting firms for international nonprofits based in Switzerland

Ranked by team size

Top 25 of 248 accounting firms for international nonprofits based in Switzerland, ranked by team size, largest first. Data refreshed Aug 30, 2026. Evidence rates how directly each company's own description names accounting firms for international nonprofits: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts	Verified emails
1	BDO SwitzerlandPartial evidence “BDO is one of the leading audit, accounting and consulting firms in Switzerland.” Source: company website · checked Aug 30, 2026	Zofingen, Switzerland	1,001-5,000	1,100	702
2	UstaxfsPartial evidence “USTAXFS are the largest independent tax accounting firm in the UK & Europe specialising in US tax, including the complex specialism of US and UK cross-border tax planning.” Source: company website · checked Aug 30, 2026	Zurich, Switzerland	51-200	74	56
3	Treuhand- UND Revisionsgesellschaft Mattig-Suter UND PartnerIndirect evidence “Die Treuhand- und Revisionsgesellschaft Mattig-Suter und Partner (MSuP) wurde am 1.” Source: company website · checked Aug 30, 2026	Zurich, Switzerland	51-200	63	1
4	T R AGIndirect evidence “Die T+R AG ist eine bedeutende regionale Dienstleistungsunternehmung in den Bereichen der Wirtschaftsberatung, der Wirtschaftsprüfung und der Steuerberatung, die Sie bei all Ihren…” Source: company website · checked Aug 30, 2026	Muri Bei Bern, Switzerland	51-200	60	34
5	Bommer Partner TreuhandIndirect evidence “Für unsere Kunden generieren wir Mehrwert durch professionelle und individuelle Dienstleistungen auf der Basis von persönlichen Beziehungen in den Bereichen Treuhand…” Source: company website · checked Aug 30, 2026	Bern, Switzerland	51-200	46	32
6	Diacron GroupPartial evidence “Diacron Group provides accounting, tax and corporate services.” Source: company website · checked Aug 30, 2026	Lugano, Switzerland	51-200	41	26
7	PKF Fiduciaire SAIndirect evidence “PKF Fiduciaire SA est spécialisée dans l'audit, l'expertise comptable, le conseil fiscal, la gestion des salaires et l'administration de sociétés.” Source: company website · checked Aug 30, 2026	Geneve, Switzerland	51-200	34	25
8	Fineac Treuhand TAX AuditIndirect evidence “Unabhängig von der Grösse des Anliegens: Wir von Fineac klären mit Ihnen die genauen Bedürfnisse ab und entwickeln für Sie das beste Dienstleistungspaket – individuell und…” Source: company website · checked Aug 30, 2026	Zug, Switzerland	11-50	27	19
9	Buchhaltungs UND Revisions AGIndirect evidence “Our promise since 1962.” Source: company website · checked Aug 30, 2026	Zug, Switzerland	11-50	26	14
10	AlltaxIndirect evidence “Ganz persönlich und alles aus einer Hand: Treuhand, Steuern, Wirtschaftsprüfung und Unternehmensberatung.” Source: company website · checked Aug 30, 2026	Basel, Switzerland	11-50	22	14
11	Curia AGIndirect evidence “Damit Sie Mehrwert erleben, setzen wir uns täglich mit einem breit abgestützten Angebot und bestens etablierten Prozessen für Sie ein.” Source: company website · checked Aug 30, 2026	Chur, Switzerland	11-50	21	18
12	Caminada ZurichIndirect evidence “We have been acknowledged as an independent, flexible and trustworthy consulting firm since 1946.” Source: company website · checked Aug 30, 2026	Zurich, Switzerland	11-50	20	13
13	Value Solutions AGIndirect evidence “Highly qualified for tailor-made service” Source: company website · checked Aug 30, 2026	Cham, Switzerland	11-50	20	10
14	Fidexaudit SAIndirect evidence “Depuis plus de 30 années, Fidexaudit accompagne ses clients dans tous les domaines de la fiduciaire.” Source: company website · checked Aug 30, 2026	Vevey, Switzerland	11-50	20	2
15	Nofival SAIndirect evidence “Notre fiduciaire-conseil est l’un des leaders de la branche dans sa région (Valais / Vaud).” Source: company website · checked Aug 30, 2026	Sion, Switzerland	11-50	19	14
16	ConsultiveIndirect evidence “Consultive ist Ihr KMU Partner für Revision, Treuhand und Unternehmensberatung in Winterthur.” Source: company website · checked Aug 30, 2026	Winterthur, Switzerland	11-50	17	13
17	Gfeller Partner AGIndirect evidence “Gfeller + Partner AG ist ein mittelständisches Dienstleistungsunternehmen, welches Wirtschaftsprüfungs, Steuer- und Beratungsdienstleistungen anbietet.” Source: company website · checked Aug 30, 2026	Langenthal, Switzerland	11-50	17	11
18	Mazars In SwitzerlandPartial evidence “Mazars is an internationally integrated partnership, specialising in audit, accountancy, advisory, tax and legal services*.” Source: company website · checked Aug 30, 2026	Geneve, Switzerland	201-500	17	9
19	Duttweiler Treuhand AGIndirect evidence “Die Duttweiler Treuhand AG ist Ihre Spezialistin für Buchführungen und Rechnungswesen, Ihre Expertin für Steuerberatungen, Wirtschaftsprüfungen, Unternehmensberatungen und…” Source: company website · checked Aug 30, 2026	Liestal, Switzerland	11-50	14	8
20	Aidoo AGPartial evidence “Seit 1982 vertrauen nationale und internationale Gesellschaften und Privatpersonen in den Bereichen Steuern, Rechnungswesen, Unternehmensberatung und Wirtschaftsprüfung auf aidoo.” Source: company website · checked Aug 30, 2026	Zug, Switzerland	11-50	13	11
21	Abelia Wirtschaftsprüfung UND Beratung AGIndirect evidence “Wir entwickeln für Sie individuelle und auf Ihre Bedürfnisse angepasste Lösungen in den Bereichen Treuhand, Wirtschaftsprüfung, Steuern und Unternehmensberatung- Treuhand: Wir…” Source: company website · checked Aug 30, 2026	Basel, Switzerland	11-50	13	6
22	Auditrium AGIndirect evidence “Wir denken neue Wege, Geben Zahlen Sinn und Klarheit.” Source: company website · checked Aug 30, 2026	Zurich, Switzerland	11-50	12	9
23	Société Fiduciaire D'expertise ET Revision SAIndirect evidence “Fiduciaire indépendante, genevoise et familiale, active dans l'établissement et la révision des comptes, la fiscalité, les services, le conseil et la gestion, notre approche de…” Source: company website · checked Aug 30, 2026	Switzerland	11-50	12	9
24	Sefid Treuhand & RevisionIndirect evidence “Unser oberstes Ziel als Dienstleistungsunternehmen sind zufriedene und gut beratene Kunden.” Source: company website · checked Aug 30, 2026	Cham, Switzerland	11-50	12	7
25	Convicta Treuhand AGIndirect evidence “Wir bezeichnen uns als Zahlenakrobaten und Supertreuhänder, arbeiten akribisch von der linken zur rechten Kontoseite und weisen ein enormes Durchhaltevermögen auf, wenn es darum…” Source: company website · checked Aug 30, 2026	Hochdorf, Switzerland	11-50	12	6

Showing 25 of 248 accounting firms for international nonprofits based in Switzerland

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Accounting firms for international nonprofits based in Switzerland at a glance

As of Aug 30, 2026

1-10Median size (employees)

ZurichLargest hub · 23 HQs

45Contacts with mobile numbers

Aug 30, 2026Data refreshed

Companies by employee count

1-10

162

11-50

51-200

201-500

1,001-5,000

10001+

Accounting firms for international nonprofits by metro

Metro	Companies
Accounting firms for international nonprofits in Zurich	23
Accounting firms for international nonprofits in Zug	15
Accounting firms for international nonprofits in Geneve	13
Accounting firms for international nonprofits in Lugano	10
Accounting firms for international nonprofits in Basel	9
Accounting firms for international nonprofits in Geneva	8
Accounting firms for international nonprofits in Lausanne	8

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 firms for international nonprofits, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
What qualifies: Companies headquartered in Switzerland whose own description of what they do matches “accounting firms for international nonprofits”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among accounting firms for international nonprofits, and records with no verified work email. Companies headquartered outside Switzerland 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 an evidence rating so you can judge each match yourself.
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, 1,389 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 August 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.

Frequently asked

How many accounting firms for international nonprofits are there based in Switzerland?

There are 248 accounting firms for international nonprofits headquartered in Switzerland as of August 2026 (RevenueBase).

What is the largest company on this list?

BDO Switzerland, headquartered in Zofingen, tops this list with the largest team on record.

Which city has the most accounting firms for international nonprofits?

Zurich leads with 23 headquartered companies, followed by Zug (15) and Geneve (13).

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 1,389 verified decision-maker contacts tracked across these 248 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 30, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.