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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 294  (10.38 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 11.2 years (max.: 37.5 years)

Total number of statutory audit clients: 3'053 (Ranked #3 in Switzerland)

Change in number of audit engagements: -32 (since 31.12.2025), -93 (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 89 4 7 191 66 105 57 229 5 15 2 60 16 21 5 66 16 37 30 38 108 1 232 26 199 495 2'120
Limited liability company 14     9 8 17 5 33   1 1 13 5   1 6 19 5 4   11   36 1 63 61 313
Foundation 11 1   55 13 29 2 25 1 3 1 8 3 1   8   6 5   14 1 19 4 16 91 317
Cooperative 21 1 2 23 8 2 9 5 1 8 5 17 3 1 1 31 1 12 4 14 16 2 15 17 6 19 244
Association       8   1   4       2             1   1   4     15 36
Special legal forms       2   4 1 3 1 1   1                     2 1   7 23
∑ 135 6 9 288 95 158 74 299 8 28 9 101 27 23 7 111 36 60 44 52 150 4 308 49 284 688 3'053

This audit firm is recorded as statutory auditor for 3770 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 3'053 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 35 1 4 28 82 133 16 76 1 8 8 21 5 1 1 37 4 20 16 16 22 3 105 27 25 82 777
Bern 13     215   4 18   3 6   10 2 12   4   17 1 3 1 1 13 2 6 28 359
Lancy 1     6   4 10 178       2 6         4         46 1 15 12 285
Lugano               1   3   1 2 2             114       1 6 130
Luzern 4     1   1           24   3 4       1           3   41
Renens (VD)       12   1 23 28         8               6   119 15 6 3 221
St. Gallen 6 3 4 1 3     3   1 1 1 1     41 1   1 12 1   4   4 9 97
Zug 2     1 1 1   1   1   7   2     5   2   4   1   58 8 94
Zürich 45 2 1 24 9 13 7 12 4 8   33 3 3 1 29 23 12 23 21 2   20 4 163 535 997
∑ 135 6 9 288 95 158 74 299 8 28 9 101 27 23 7 111 36 60 44 52 150 4 308 49 284 688 3'053

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: 3'059

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
NGF - Nationaler Garantiefonds Schweiz CHE-109.702.528 Zürich 05.06.2026 First auditor Zürich
NVB - Nationales Versicherungsbüro Schweiz CHE-109.702.534 Zürich 05.06.2026 First auditor Zürich
SOVERA BY CA SA CHE-365.149.838 Genève 05.06.2026 First auditor Lancy
Dynatrace GmbH CHE-106.068.729 Luzern 02.06.2026 Auditor switch Zürich
Audi F1 Campus AG CHE-303.047.838 Hinwil 01.06.2026 First auditor 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
Vontobel Asset Management AG CHE-154.540.195 Zürich 05.06.2026 Auditor switch Zürich
Vontobel Securities AG CHE-100.838.920 Zürich 04.06.2026 Auditor switch Basel
Privatbank Bellerive AG CHE-106.240.804 Zürich 02.06.2026 Auditor switch Zürich
ALSO Holding AG CHE-100.000.259 Emmen 29.05.2026 Auditor switch Zürich
Evolve SA CHE-114.160.225 Bellinzona 26.05.2026 Auditor switch Lugano