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Fact Sheet BDO AG

Core Company Information
Company Name BDO AG
UID CHE-105.952.747
Alternative / previous Names BDO SA, BDO Ltd
BDO Visura
Visura Treuhand-Gesellschaft, Visura Société Fiduciaire, Visura Società Fiduciaria, Visura Auditing and Fiduciary Company
Domicile Zürich
Canton ZH
Legal Form Limited corporation
Inscription Date 30.12.1932
Website https://www.bdo.ch
Takeovers: accontax Markus Gfeller Treuhand AG (CHE-101.350.360), per 03.06.2025
BDO Sofirom SA (CHE-106.015.064), per 09.07.2013
BDO Visura (Valais) SA (CHE-113.627.261), per 09.07.2013
BDO Visura International AG (CHE-101.311.259), per 29.11.2016
Continental Revision und Treuhand AG in Liquidation (CHE-102.133.983), per 11.12.2020
Dr. Suter Treuhand AG (CHE-106.926.617), per 06.05.2010
Fidirevisa SA (CHE-105.752.734), per 17.12.2015
FSA FIDUCIARIA SVIZZERA DEGLI ALBERGATORI DIVISIONE TICINO SA (CHE-110.366.118), per 09.07.2013
Jörg Moser AG (CHE-108.766.997), per 03.06.2022
LMK Revisions AG (CHE-102.604.764), per 12.07.2021
Wyss + Partner Treuhand AG (CHE-106.214.899), per 29.06.2021
FAOA Information
FAOA ID 500705
RAB Permission state-regulated audit firm
FAOA License active (since 13.12.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (41) BDO AG (CHE-345.012.024) in Aarau (AG)  
BDO AG (CHE-265.966.133) in Affoltern am Albis (ZH)
BDO AG (CHE-426.842.563) in Altdorf (UR) (UR)
BDO AG (CHE-229.255.214) in Baden (AG)
BDO AG (CHE-370.772.724) in Basel (BS)
BDO AG (CHE-430.259.378) in Bern (BE)
BDO AG (CHE-305.494.906) in Biel/Bienne (BE)
BDO SA (CHE-224.514.963) in Bulle (FR)
BDO AG (CHE-414.946.954) in Burgdorf (BE)
BDO AG (CHE-444.757.547) in Chur (GR)
BDO SA (CHE-383.819.803) in Delémont (JU)
BDO SA (CHE-347.141.454) in Epalinges (VD)
BDO AG (CHE-487.865.056) in Frauenfeld (TG)
BDO AG (CHE-314.312.594) in Glarus (GL)
BDO AG (CHE-327.753.565) in Grenchen (SO)
BDO AG (CHE-325.977.510) in Herisau (AR)
BDO AG (CHE-373.972.722) in Lachen (SZ)
BDO AG (CHE-132.773.704) in Lamone (TI)
BDO AG (CHE-408.158.150) in Langenthal (BE)
BDO AG (CHE-320.101.456) in Laufen (BL)
BDO AG (CHE-147.528.510) in Liestal (BL)
BDO AG (CHE-384.263.558) in Luzern (LU)
BDO SA (CHE-213.009.885) in Monthey (VS)
BDO AG (CHE-218.606.663) in Muri (AG) (AG)
BDO SA (CHE-412.010.941) in Nyon (VD)
BDO AG (CHE-303.222.254) in Olten (SO)
BDO AG (CHE-135.926.789) in Sarnen (OW)
BDO AG (CHE-161.247.777) in Schaffhausen (SH)
BDO AG (CHE-210.965.785) in Schwyz (SZ)
BDO SA (CHE-278.511.546) in Sion (VS)
BDO AG (CHE-389.731.986) in Solothurn (SO)
BDO AG (CHE-386.245.531) in St. Gallen (SG)
BDO AG (CHE-457.315.785) in Stans (NW)
BDO AG (CHE-384.985.628) in Steinhausen (ZG)
BDO AG (CHE-295.361.041) in Sursee (LU)
BDO AG (CHE-154.513.531) in Uster (ZH)
BDO SA (CHE-398.161.059) in Vernier (GE)
BDO SA (CHE-320.207.362) in Villars-sur-Glâne (FR)
BDO AG (CHE-345.180.503) in Wetzikon (ZH) (ZH)
BDO AG (CHE-392.959.099) in Winterthur (ZH)
BDO AG (CHE-313.962.401) in Zofingen (AG)
BDO AG (CHE-367.201.384) in Arosa (GR)
BDO SA (CHE-208.015.259) in Delémont (JU)
BDO Visura (CHE-313.641.055) in Delémont (JU)
BDO Visura (CHE-421.671.283) in Egerkingen (SO)
Visura Société Fiduciaire (CHE-999.000.112) in Fribourg (FR)
BDO AG (CHE-367.593.836) in Kreuzlingen (TG)
BDO Visura (CHE-325.058.313) in Nyon (VD)
BDO Visura (ADM-212.658.265) in Oensingen (SO)
BDO Visura (ADM-278.574.216) in Olten (SO)
BDO SA (CHE-464.088.838) in Porrentruy (JU)
BDO SA (CHE-309.054.162) in Porrentruy (JU)
BDO AG (CHE-329.959.698) in Rüte (AI)
BDO AG (CHE-363.697.773) in Wil (SG) (SG)
BDO Visura (CHE-316.539.499) in Zürich (ZH)
Membership in Associations EXPERTsuisse
IIAS
Number of auditors with permission 333  (20.01 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.6 years (max.: 33.8 years)

Total number of statutory audit clients: 6'663 (Ranked #1 in Switzerland)

Change in number of audit engagements: +65 (since 31.12.2025), +278 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 18 (thereof 0 in the SMI, 1 in the SMI Expanded and 12 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 551 8 9 485 163 135 142 197 20 61 31 315 40 52 79 129 25 292 117 69 125 49 273 126 274 836 4'603
Limited liability company 26     29 9 10 12 13 4 8 5 13 7 2 3 17 3 21 8 2 7 2 10 20 29 72 332
Foundation 124   9 132 36 91 15 31 7 17 10 81 1 15 21 40 4 86 15 14 30 11 56 22 37 267 1'172
Cooperative 28   1 34 10 6 8   1 6   24 1 1 1 3   12 4 6 4 3 7 2 3 88 253
Association 29     48 10 12 1 6   3   22     1 3 1 15 1   3   14 4 10 61 244
Special legal forms 3 1 1 5 2 2 5 1 2 2   3   1   5 1 5   2 5   6 2   5 59
∑ 761 9 20 733 230 256 183 248 34 97 46 458 49 71 105 197 34 431 145 93 174 65 366 176 353 1'329 6'663

This audit firm is recorded as statutory auditor for 2641 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'663 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 437     12 11 13   1   5   19   1   4   29 3 3 1 1 1   14 61 616
Affoltern am Albis 6       1                         1             3 22 33
Altdorf (UR) 1                 2   2             15     51     4   75
Baden 123     11 1 1       1   7     2     4 3       2 1 3 27 186
Basel 16 1   10 89 184     1 1 1 4   1 3     13     2 2 1   2 27 358
Bern 18     317 2 3 15 4 2 7 1 12 5 1   1 2 12 5 7 1 2 10 16 8 37 488
Biel/Bienne 4     69 2 4 1 2     1   4         6         6     10 109
Bulle             2                                       2
Burgdorf 2     70     1         1       2   10             1 2 89
Chur                 1 43           1       3             48
Delémont               1     23   4                           28
Epalinges       2     9 18     5   17         1 1       206 15 2   276
Frauenfeld                               1       16         1 4 22
Glarus     1 1         19             8     1             8 38
Grenchen       31 1 2 1               1 1   76     1   1   3 8 126
Herisau   1 3                         1                   2 7
Lachen 12       3 3   1 3 4   2 1   2 17 1   53 2   1 1 1 5 34 146
Lamone           1   5   4   3                 156   2   1 3 175
Langenthal       74                           3                 77
Laufen         14                         13     1           28
Liestal 6     3 85 23         1 9   1       8 1       2   1 4 144
Luzern 9     13 1         7   261   15 24 4   1 9   3 3   3 38 42 433
Monthey                                             4 10     14
Muri (AG) 2                                                   2
Nyon               3                             31       34
Olten 11     8 1   1       1             57             5   84
Porrentruy                     6                               6
Sarnen 1                     4   1 46                       52
Schaffhausen                                 6   1 1           2 10
Sion       1     1 4                             3 120 2   131
Solothurn 7     52 1 1 2       1 3 3   3 1   189     1   1   4 15 284
St. Gallen 3 5 16 1 1       2 5           122 10   2 48         5 19 239
Stans 2     2               6 1 45 8 1           4     1 1 71
Steinhausen 3     15 1 1       2   12 1   1 3   1 2           141 22 205
Sursee 11     5     1   2     91   3 3 1       1     1   5 5 129
Vernier       1   1 5 196         5 1             3   64 3 5 7 291
Villars-sur-Glâne       4     142 3         7                   19 4 2 4 185
Wetzikon (ZH)   1   1         1 1   3     1 5 3   4 3     2   5 179 209
Winterthur                                                   2 2
Zofingen 47                                 2             2   51
Zürich 40 1   30 16 19 2 10 3 15 6 19 1 2 11 24 12 5 45 9 5 1 9 3 90 782 1'160
∑ 761 9 20 733 230 256 183 248 34 97 46 458 49 71 105 197 34 431 145 93 174 65 366 176 353 1'329 6'663

Show client list for Aarau, Affoltern am Albis, Altdorf (UR), Baden, Basel, Bern, Biel/Bienne, Bulle, Burgdorf, Chur, Delémont, Epalinges, Frauenfeld, Glarus, Grenchen, Herisau, Lachen, Lamone, Langenthal, Laufen, Liestal, Luzern, Monthey, Muri (AG), Nyon, Olten, Porrentruy, Sarnen, Schaffhausen, Sion, Solothurn, St. Gallen, Stans, Steinhausen, Sursee, Vernier, Villars-sur-Glâne, Wetzikon (ZH), Winterthur, Zofingen, Zürich.

Related audit firms

Network:

Total number of audit engagements across the network: 6'664

Direct personal relationship:

Same domicile: 

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
Wilhelmina von Hallwil-Stiftung CHE-110.376.648 Zürich 20.05.2026 Auditor switch Zürich
BE-CEUTICALS SA CHE-312.673.288 Conthey 18.05.2026 Auditor switch Sion
Febuki Holding AG CHE-154.203.510 Aarau 18.05.2026 First auditor Aarau
Bacardi Martini Patrón International GmbH CHE-114.589.605 Schaffhausen 15.05.2026 Auditor switch Zürich
Portmann Partner AG CHE-107.712.792 Bremgarten (AG) 12.05.2026 First auditor Solothurn
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
Aargau Verkehr AG (AVA) CHE-105.929.949 Aarau 19.05.2026 Auditor switch Aarau
Messer Wohnen AG CHE-109.107.515 Bellach 19.05.2026 Opting-out Solothurn
Weinkeller Haller AG CHE-108.415.285 Baden 19.05.2026 Opting-out Baden
Schallberger Rent AG CHE-114.681.636 Oberdorf (NW) 18.05.2026 Opting-out Stans
Meritech AG CHE-102.219.679 Bottmingen 12.05.2026 Opting-out Basel