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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 285  (10.81 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 11 years (max.: 36.6 years)

Total number of statutory audit engagements: 3'081 (Ranked #3 in Switzerland)

Change in number of audit engagements: -98 (since 31.12.2024), -144 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 49 (thereof 7 in the SMI, 7 in the SMI Expanded and 25 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 80 2 8 195 71 103 59 231 3 11 4 50 17 17 4 59 19 36 33 47 111 1 250 32 191 502 2'136
Limited liability company 14     9 8 17 4 32   1 1 9 7 1 1 6 16 5 5   12   34 2 64 53 301
Foundation 11 1   61 13 30 3 27 1 3 1 8 3 1   8   6 6 2 15 1 21 3 17 91 333
Cooperative 21 1 2 25 8 2 9 5 1 8 5 17 3 1 1 32 1 13 4 14 16 2 15 17 6 21 250
Association       8   1   3       2             1   1   6     14 36
Special legal forms       3   5 1 3 1 1   1                     3 1   6 25
∑ 126 4 10 301 100 158 76 301 6 24 11 87 30 20 6 105 36 60 49 63 155 4 329 55 278 687 3'081

This audit firm is recorded as statutory auditor for 3697 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 3'081 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 28     2 4 1       1   1     1   3 5             3 6 55
Basel 34 2 4 32 83 129 16 76 1 8 9 21 5 2 1 38 4 22 15 16 22 3 105 26 24 87 785
Bern 6     221   6 19   1   1 9 2 12   3   17   2 2 1 12   7 29 350
Lancy 1     5   4 9 177       2 7         4         43 2 7 12 273
Lugano               2   3   1 2 1             118       1 5 133
Luzern 3     2   2           18     3                   3   31
Renens (VD)       12   2 26 30         10               6   146 22 6 4 264
St. Gallen 6   4 1 3     3   4 1   1     41 1   1 9 1   4 1 3 11 95
Zug 3     1 1     1   1   7   2     4   2 1 5       56 7 91
Zürich 45 2 2 25 9 14 6 12 4 7   28 3 3 1 23 24 12 31 35 1   19 4 168 526 1'004
∑ 126 4 10 301 100 158 76 301 6 24 11 87 30 20 6 105 36 60 49 63 155 4 329 55 278 687 3'081

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: 3'087

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
Nuclidium AG CHE-412.395.606 Basel 18.07.2025 Auditor switch Basel
Geberit Finanz AG CHE-182.929.954 Rapperswil-Jona 17.07.2025 Auditor switch Zürich
Geberit Real Estate AG CHE-378.650.616 Rapperswil-Jona 17.07.2025 Auditor switch Zürich
Wärmemobil AG CHE-107.377.280 Weiningen (ZH) 17.07.2025 Auditor switch Zürich
H. Lüdi + Co AG CHE-101.933.969 Regensdorf 16.07.2025 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
Ekkiden Technologies SA CHE-345.305.383 Ecublens (VD) 18.07.2025 Auditor switch Renens (VD)
Kernkraftwerk Gösgen-Däniken AG CHE-101.926.521 Däniken 15.07.2025 Auditor switch Zürich
Senthorus SA CHE-156.276.000 Genève 15.07.2025 Auditor switch Renens (VD)
Swiss Bankers Prepaid Services AG CHE-114.280.237 Grosshöchstetten 15.07.2025 Auditor switch Bern
TICINOCURE SA CHE-219.760.893 Manno 15.07.2025 Discontinued Lugano