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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  (10.63 audit engagements per employee on average)
Auditor Statistics

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

Total number of statutory audit clients: 3'072 (Ranked #3 in Switzerland)

Change in number of audit engagements: -14 (since 31.12.2025), -107 (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 7 192 66 101 58 230 3 9 3 57 16 21 4 64 16 39 31 38 105 1 238 26 203 508 2'124
Limited liability company 14     10 8 18 4 34   1 1 12 6 1 1 6 19 5 4   11   36 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 9 294 95 155 74 301 6 22 10 97 28 24 6 110 36 63 46 53 148 4 318 49 290 698 3'072

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 3'072 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 82 129 16 78 1 8 8 21 5 2 1 38 4 22 15 16 22 3 105 27 25 86 784
Bern 6     218   3 18   1   1 9 2 12   3   17 1 3 1 1 13   7 28 344
Lancy 1     6   4 10 177       2 7         4         45 2 15 12 285
Lugano               1   3   1 2 2             112       1 5 127
Luzern 3     2   2           22   3 3     1             3   39
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 10 99
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 4 167 541 1'013
∑ 130 6 9 294 95 155 74 301 6 22 10 97 28 24 6 110 36 63 46 53 148 4 318 49 290 698 3'072

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: 3'078

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
AS Equity HoldCo AG CHE-367.245.499 Freienbach 12.01.2026 First auditor Bern
von Rundstedt & Partner Schweiz AG CHE-194.574.846 Zürich 09.01.2026 Auditor switch Zürich
BB Energy Suisse SA CHE-109.890.950 Genève 29.12.2025 Auditor switch Lancy
Meister 1881 AG CHE-100.275.477 Zürich 23.12.2025 Auditor switch St. Gallen
SicuroCentral AG CHE-103.940.383 Emmen 22.12.2025 Auditor switch Luzern
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
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
Moritz Straus-Stiftung CHE-110.408.975 Basel 07.01.2026 Auditor switch Basel
poltronesofà swiss sa CHE-300.800.806 Paradiso 30.12.2025 Auditor switch Lugano
Colombo & Partners SA CHE-107.386.066 Lugano 29.12.2025 Auditor switch Lugano