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The ten biggest Swiss audit firms (in terms of statutory audit clients)

# Audit Firm Number of Audit Engagements Average engagement duration Number of auditors with permission
1 BDO AG 6'233 9.98 296
2 PricewaterhouseCoopers AG 5'342 11.70 312
3 Ernst & Young AG 3'270 10.75 299
4 KPMG AG 2'895 9.59 332
5 OBT AG 1'256 10.88 45
6 Deloitte AG 1'093 7.78 113
7 Fiduciaire FIDAG SA 827 11.83 23
8 Berney Associés Audit SA 801 9.47 24
9 Balmer-Etienne AG 770 10.13 27
10 FORVIS MAZARS SA 687 4.57 65

Evolution of licensed audit firms

auditorstats.ch - data source: FAOA register (own analysis).

Recently accredited audit firms

Date Audit Firm   License FAOA ID
14.05.2024 MAY Fiduciaire Sàrl Penthéréaz (VD) Revisor/in 505498
13.05.2024 studioma.ch Sagl Lugano (TI) Revisor/in 505509
19.04.2024 Scherer Advisory GmbH Hünenberg (ZG) Revisionsexperte/in 505510
18.04.2024 FocuS Financial Services SA Carouge (GE) Revisionsexperte/in 505491
17.04.2024 KB audit gmbh Bettwil (AG) Revisionsexperte/in 505508
16.04.2024 Fiduciaire de la Côte Sàrl Nyon (VD) Revisor/in 505506
11.04.2024 OAB Treuhand GmbH Hünenberg (ZG) Revisor/in 505344
05.04.2024 Rinderer & Partner AG Buchs (SG) Revisionsexperte/in 505501
25.03.2024 Reist Treuhand GmbH Biel/Bienne (BE) Revisor/in 505504
25.03.2024 Treuhand Arn & Partner AG Lyss (BE) Revisor/in 500233

Auditor mergers and takeovers

Date Acquirer   Acquiree  
14.06.2024 FHS Fidufisc SA Biel/Bienne (BE) Treuhand Riesen AG Biel/Bienne (BE)
07.02.2024 Reist Treuhand GmbH Biel/Bienne (BE) Reist - Treuhand Biel/Bienne (BE)
22.01.2024 Aeberli Treuhand AG Zürich (ZH) Revex, Treuhand AG Zürich Zürich (ZH)
18.12.2023 KPMG AG Zürich (ZH) Fides Revision AG Zürich (ZH)
11.12.2023 Berater & Partner AG Luzern (LU) Handels- und Gewerbe - Treuhand AG Oberkulm (AG)
06.12.2023 Avanta Audit AG Baar (ZG) AVANTA AUDIT ZURICH AG Zürich (ZH)
30.10.2023 wichert-treuhand ag Lachen (SZ) Wichert Treuhand & Finanzcontrolling Lachen (SZ)
17.08.2023 Ernst & Young AG Basel (BS) Bösch & Edthofer AG Herisau (AR)
27.06.2023 KMU Revipartner AG Jegenstorf (BE) CONSVAL REVISIONEN GMBH Thun (BE)
23.06.2023 Dürst Treuhand AG Rüti (ZH) ZIT Ziegler Immobilien & Treuhand GmbH Rüti (ZH)