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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  (10.72 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 11.2 years (max.: 37.6 years)

Total number of statutory audit clients: 3'034 (Ranked #3 in Switzerland)

Change in number of audit engagements: -51 (since 31.12.2025), -54 (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 92 4 7 189 64 100 63 229 6 14 2 63 17 21 5 65 17 37 32 36 95 1 226 26 194 495 2'100
Limited liability company 13     10 8 16 5 33   1 2 13 5   1 7 19 6 4   10   36 1 66 60 316
Foundation 11 1   55 13 28 2 25 1 3 1 11 3 1   8   6 5   14   18 4 13 90 313
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       8   1   4       3             1   1   4     15 37
Special legal forms       2   4 1 3 1 1   1                     2 1   7 23
∑ 137 6 9 287 93 151 80 299 9 27 10 108 29 23 7 111 37 61 46 50 136 3 301 49 279 686 3'034

This audit firm is recorded as statutory auditor for 3813 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 3'034 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 28 80 127 16 77 1 8 8 20 5 1 1 37 4 20 16 16 22 2 105 27 24 78 762
Bern 15     215   4 18   4 6   11 2 12   5   19 1 1 1 1 13 2 6 29 365
Lancy 1     6   4 10 178     1 2 7         4         47 1 15 12 288
Lugano               1   3   1 2 2             102       1 6 118
Luzern 6     1   1           32   3 4       3           3   53
Renens (VD)       11   1 29 27         9               6   113 15 6 3 220
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   56 8 90
Zürich 44 2 1 24 9 12 7 12 4 8   32 3 3 1 28 24 11 23 21 2   18 4 161 535 989
∑ 137 6 9 287 93 151 80 299 9 27 10 108 29 23 7 111 37 61 46 50 136 3 301 49 279 686 3'034

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: 3'040

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
Manufacture Romain Gauthier SA CHE-112.382.401 Le Chenit 10.08.2026 Auditor switch Lancy
Norvestor Advisory AG CHE-350.750.872 Zug 10.08.2026 First auditor Zug
Espace Health Homecare AG CHE-231.973.649 Muri bei Bern 06.08.2026 Auditor switch Bern
Akzo Nobel Coatings AG CHE-106.001.211 Neuenkirch 04.08.2026 Auditor switch Luzern
Arte Panis SA CHE-101.312.201 Givisiez 04.08.2026 Auditor switch Renens (VD)
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
Yext Sàrl CHE-444.897.562 Genève 07.08.2026 Opting-out Lancy
Zariya Stiftung CHE-116.188.565 Basel 07.08.2026 Auditor switch Zürich
EffRx Pharmaceuticals SA CHE-115.242.363 Freienbach 04.08.2026 Auditor switch Basel
ALSO Schweiz AG CHE-106.008.242 Emmen 30.07.2026 Auditor switch Zürich
NatWest Services (Switzerland) AG CHE-102.978.503 Zürich 28.07.2026 Auditor switch Zürich