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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), -48 (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 91 4 7 187 66 103 58 228 6 15 2 63 17 21 5 64 16 37 31 36 100 1 225 26 193 494 2'096
Limited liability company 13     10 8 16 5 34   1 2 13 5   1 7 19 6 4   11   36 1 66 60 318
Foundation 11 1   55 13 29 2 25 1 3 1 10 3 1   8   6 5   14   19 4 15 90 316
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       2             1   1   4     15 36
Special legal forms       2   4 1 3 1 1   1                     2 1   7 23
∑ 136 6 9 285 95 155 75 299 9 28 10 106 29 23 7 110 36 61 45 50 142 3 301 49 280 685 3'034

This audit firm is recorded as statutory auditor for 3804 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 82 130 16 76 1 8 8 20 5 1 1 37 4 20 16 16 22 2 105 27 24 79 767
Bern 14     212   4 18   4 6   11 2 12   4   19 1 1 1 1 12 2 6 30 360
Lancy 1     6   4 10 179     1 2 7         4         46 1 15 12 288
Lugano               1   3   1 2 2             106       1 6 122
Luzern 5     1   1           29   3 4       2           3   48
Renens (VD)       12   1 24 27         9               6   115 15 6 3 218
St. Gallen 6 3 4 1 3     3   1 1 1 1     41 1   1 12 1   4   4 10 98
Zug 2     1 1 1   1   1   7   2     5   2   4   1   56 8 92
Zürich 45 2 1 24 9 13 7 12 4 8   33 3 3 1 28 23 11 23 21 2   18 4 162 532 989
∑ 136 6 9 285 95 155 75 299 9 28 10 106 29 23 7 110 36 61 45 50 142 3 301 49 280 685 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
LT Rohr Experten AG CHE-167.913.259 Feusisberg 15.07.2026 Auditor switch Luzern
Zwilag Zwischenlager Würenlingen AG CHE-101.539.242 Würenlingen 15.07.2026 Auditor switch Luzern
Adria Mobil Schweiz GmbH CHE-110.271.334 Brügg 14.07.2026 Auditor switch Bern
Triton Gemini RigCo GmbH CHE-232.772.912 Steinhausen 14.07.2026 First auditor Zürich
DKSH Schweiz AG CHE-107.880.981 Zürich 13.07.2026 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
TECregen AG CHE-442.791.208 Basel 13.07.2026 Auditor switch Basel
Associated Foreign Exchange (Schweiz) AG CHE-114.547.009 Zürich 10.07.2026 Auditor switch Basel
Medair Staff Assistance Foundation CHE-112.022.925 Ecublens (VD) 10.07.2026 Discontinued Basel
ENGIE Energy Management Holding Switzerland AG CHE-115.493.557 Zug 08.07.2026 Auditor switch Zug
Spendenstiftung Bank Vontobel CHE-110.234.592 Zürich 07.07.2026 Auditor switch Zürich