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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 289  (10.64 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 11.1 years (max.: 37.1 years)

Total number of statutory audit clients: 3'075 (Ranked #3 in Switzerland)

Change in number of audit engagements: -11 (since 31.12.2025), -105 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 49 (thereof 6 in the SMI, 6 in the SMI Expanded and 26 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 84 4 7 191 66 102 58 230 3 9 3 59 16 21 4 64 16 39 31 38 105 1 239 26 203 508 2'127
Limited liability company 14     10 8 18 4 35   1 1 12 6 1 1 6 19 5 4   11   35 2 65 59 317
Foundation 11 1   56 13 29 2 26 1 3 1 8 3 1   8   6 6 1 15 1 21 3 16 92 324
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 19 248
Association       8   1   3       2             1   1   5     13 34
Special legal forms       3   4 1 3 1 1   1                     3 1   7 25
∑ 130 6 9 293 95 156 74 302 6 22 10 99 28 24 6 110 36 63 46 53 148 4 318 49 290 698 3'075

This audit firm is recorded as statutory auditor for 3730 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 3'075 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 30         1       1   2     1   3 7             3 5 53
Basel 35 1 4 30 82 130 16 78 1 8 8 21 5 2 1 38 4 22 15 16 22 3 105 27 25 86 785
Bern 6     217   3 18   1   1 10 2 12   3   17 1 3 1 1 13   7 28 344
Lancy 1     6   4 10 178       2 7         4         45 2 15 12 286
Lugano               1   3   1 2 2             112       1 5 127
Luzern 3     2   2           23   3 3     1             3   40
Renens (VD)       12   1 23 28         8               6   130 15 6 3 232
St. Gallen 6 3 4 1 3     3   1 1 1 1     41 1   1 12 1   4 1 4 9 98
Zug 3     1 1 1   1   1   7   2     5   2 1 4       59 8 96
Zürich 46 2 1 24 9 14 7 13 4 8   32 3 3 1 28 23 12 27 21 2   21 4 167 542 1'014
∑ 130 6 9 293 95 156 74 302 6 22 10 99 28 24 6 110 36 63 46 53 148 4 318 49 290 698 3'075

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: 3'081

Direct personal relationship:

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
Barto AG CHE-196.860.990 Oberkirch 22.01.2026 Auditor switch Bern
NNIT Switzerland AG CHE-114.517.994 Basel 21.01.2026 Auditor switch Basel
CKW Gebäudetechnik AG CHE-106.838.806 Luzern 20.01.2026 Auditor switch Luzern
Pegasus Automotive Group SA CHE-400.530.292 Nyon 20.01.2026 Auditor switch Lancy
DWS CH AG CHE-131.004.000 Zürich 19.01.2026 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
neocredit.ch AG CHE-276.367.480 Bern 22.01.2026 Opting-out Bern
Nexus Automotive International SA CHE-223.619.341 Vernier 20.01.2026 Auditor switch Lancy
Würth Elektronik (Schweiz) AG CHE-114.110.374 Volketswil 19.01.2026 Auditor switch St. Gallen
Cosa Travel Ltd CHE-107.927.097 Zürich 12.01.2026 Auditor switch Zürich
RecyPET AG CHE-104.869.492 Frauenfeld 08.01.2026 Auditor switch Zürich