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Fact Sheet Ernst & Young AG

Core Company Information
Company Name Ernst & Young AG
UID CHE-105.932.265
Alternative / previous Names Ernst & Young SA, Ernst & Young Ltd
ATAG Ernst & Young AG, ATAG Ernst & Young SA, ATAG Ernst & Young Ltd
Domicile Basel
Canton BS
Legal Form Limited corporation
Inscription Date 28.09.1998
Website https://www.ey.com/ch
Takeovers: ATAG Allgemeine Treuhand AG (CHE-100.818.892), per 20.12.2019
Bösch & Edthofer AG (CHE-103.349.066), per 17.08.2023
Ernst & Young AG (CHE-101.392.967), per 11.11.2003
Fiduciaire de gestion et d'informatique S.A. (CHE-102.664.306), per 31.05.2005
Fiduciaire Jacques Ceriani SA (CHE-101.822.086), per 08.04.2005
GBR Ernst & Young AG (CHE-100.918.105), per 05.03.2002
Hangartner Treuhand AG (CHE-100.067.795), per 19.11.2002
Neofidaria AG (ADM-169.740.521), per 09.08.2001
Treuhand- und Revisionsgesellschaft T + R Grischa AG (CHE-101.715.639), per 19.06.2001
Verifica SA (CHE-100.818.159), per 11.05.2005
FAOA Information
FAOA ID 500646
RAB Permission state-regulated audit firm
FAOA License active (since 28.11.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (9) Ernst & Young AG (CHE-461.581.835) in Aarau (AG)  
Ernst & Young AG (CHE-441.858.784) in Bern (BE)
Ernst & Young SA (CHE-186.791.979) in Lancy (GE)
Ernst & Young AG (CHE-475.755.395) in Lugano (TI)
Ernst & Young AG (CHE-259.230.495) in Luzern (LU)
Ernst & Young SA (CHE-294.400.879) in Renens (VD) (VD)
Ernst & Young AG (CHE-327.393.030) in St. Gallen (SG)
Ernst & Young AG (CHE-152.377.547) in Zug (ZG)
Ernst & Young AG (CHE-491.907.686) in Zürich (ZH)
Ernst & Young AG (CHE-311.498.829) in Baden (AG)
Ernst & Young AG (CHE-354.720.232) in Biel/Bienne (BE)
ATAG Ernst & Young AG (CHE-132.732.622) in Buchs (SG) (SG)
Ernst & Young AG (CHE-421.676.725) in Chur (GR)
Ernst & Young AG (CHE-357.440.711) in Granges-Paccot (FR)
Ernst & Young AG (CHE-367.926.091) in Kreuzlingen (TG)
Ernst & Young SA (CHE-185.564.694) in Neuchâtel (NE)
Ernst & Young SA (CHE-264.470.869) in Sion (VS)
Membership in Associations EXPERTsuisse
Number of auditors with permission 283  (10.69 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 11.2 years (max.: 37.7 years)

Total number of statutory audit clients: 3'025 (Ranked #3 in Switzerland)

Change in number of audit engagements: -61 (since 31.12.2025), -61 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 47 (thereof 6 in the SMI, 7 in the SMI Expanded and 23 in the SPI)

Details regarding the distribution of the audit engagements across legal forms and cantons are depicted in the table below.

  AG AI AR BE BL BS FR GE GL GR JU LU NE NW OW SG SH SO SZ TG TI UR VD VS ZG ZH ∑
Limited corporation 90 4 7 190 65 99 63 226 6 14 2 63 17 20 5 65 17 37 36 35 96 1 227 26 192 494 2'097
Limited liability company 13     9 8 16 5 33   1 2 13 5   1 7 19 6 4   10   36 1 66 58 313
Foundation 11 1   55 13 28 2 25 1 3 1 11 3 1   8   6 4   14   18 4 13 90 312
Cooperative 21 1 2 23 8 2 9 5 1 8 5 17 4 1 1 31 1 12 4 14 16 2 15 17 6 19 245
Association       7   1   4       3             1   1   4     14 35
Special legal forms       2   4 1 3 1 1   1                     2 1   7 23
∑ 135 6 9 286 94 150 80 296 9 27 10 108 29 22 7 111 37 61 49 49 137 3 302 49 277 682 3'025

This audit firm is recorded as statutory auditor for 3817 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 3'025 statutory audits are performed by the branch offices as indicated in the table below.

  AG AI AR BE BL BS FR GE GL GR JU LU NE NW OW SG SH SO SZ TG TI UR VD VS ZG ZH ∑
Aarau 29         1       1   2     1   3 7             3 5 52
Basel 34 1 4 29 81 126 16 77 1 8 8 20 5 1 1 37 4 20 15 16 22 2 105 27 24 77 761
Bern 15     215   4 18   4 6   10 2 11   5   19 1 1 1 1 13 2 6 29 363
Lancy 1     6   4 10 175     1 2 7         4         48 1 15 11 285
Lugano               1   3   1 2 2             102       1 6 118
Luzern 6     1   1           33   3 4       3           3   54
Renens (VD)       10   1 29 27         9               6   113 15 6 3 219
St. Gallen 6 3 4 1 3     3     1 1 1     41 1   1 12 1   4   4 10 97
Zug 2     1 1 1   1   1   7   2     5   2   2   1   55 8 89
Zürich 42 2 1 23 9 12 7 12 4 8   32 3 3 1 28 24 11 27 20 3   18 4 160 533 987
∑ 135 6 9 286 94 150 80 296 9 27 10 108 29 22 7 111 37 61 49 49 137 3 302 49 277 682 3'025

Show client list for Aarau, Basel, Bern, Lancy, Lugano, Luzern, Renens (VD), St. Gallen, Zug, Zürich.

Related audit firms

Network:

Total number of audit engagements across the network: 3'031

Further connections:

Latest audit engagements
These are this auditor's latest audit engagements.
 
Client Name Client UID Domicile Start Date Type of switch Auditor Branch
B+G Schweiz AG CHE-303.265.128 Kiesen 11.09.2026 Auditor switch Bern
Culligan Switzerland SA CHE-101.326.427 Le Mont-sur-Lausanne 11.09.2026 Auditor switch Renens (VD)
Kraftwerke Oberhasli AG CHE-105.947.143 Innertkirchen 11.09.2026 Auditor switch Bern
Yuh SA CHE-342.792.012 Gland 11.09.2026 Auditor switch Lancy
Stiftung Hilfskasse für bedürftige Kranke, Schlössli-Bergheim CHE-110.387.155 Oetwil am See 09.09.2026 Auditor switch Zürich
Discontinued audit engagements
The following audit engagements were lost recently, either to a competitor, due to auditor resignation or due to an opting out.
 
Client Name Client UID Domicile End Date Reason Auditor Branch
Centre sportif de Malley SA CHE-108.008.282 Prilly 11.09.2026 Auditor switch Renens (VD)
Myriad Genetics GmbH in Liquidation CHE-133.697.187 Zürich 08.09.2026 Opting-out Zürich
Regionale Verkehrsbetriebe Baden-Wettingen (RVBW) AG CHE-105.394.474 Wettingen 08.09.2026 Auditor switch Zürich
Reyl & Cie Holding SA CHE-101.230.891 Genève 07.09.2026 Auditor switch Lancy
Halag Chemie AG CHE-101.129.536 Aadorf 04.09.2026 Auditor switch Zürich