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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 Visura (CHE-313.641.055) in Delémont (JU)
BDO SA (CHE-208.015.259) 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-309.054.162) in Porrentruy (JU)
BDO SA (CHE-464.088.838) 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 336  (19.85 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.6 years (max.: 34 years)

Total number of statutory audit clients: 6'670 (Ranked #1 in Switzerland)

Change in number of audit engagements: +72 (since 31.12.2025), +273 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 19 (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 546 8 9 490 164 133 139 204 19 62 30 315 39 53 78 130 25 291 116 72 123 49 271 129 267 839 4'601
Limited liability company 27     27 9 10 12 14 4 8 5 14 8 2 2 17 3 21 8 2 8 2 10 18 27 74 332
Foundation 122   9 132 36 91 15 31 8 17 10 80 1 15 21 42 4 87 17 15 30 11 56 22 37 266 1'175
Cooperative 29   1 34 10 6 8   1 6   24 1 1 1 3   12 4 6 4 3 7 2 3 88 254
Association 30     48 10 12 1 7   4   22     1 3 1 15 1   3   14 4 8 64 248
Special legal forms 4 1 1 5 2 2 5 1 2 2   3   1   5 1 5   2 5   6 2   5 60
∑ 758 9 20 736 231 254 180 257 34 99 45 458 49 72 103 200 34 431 146 97 173 65 364 177 342 1'336 6'670

This audit firm is recorded as statutory auditor for 2695 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'670 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 432     11 11 13   1   5   15   1   5   29 3 3 1 1 1   14 58 604
Affoltern am Albis 6       1                         1             3 23 34
Altdorf (UR) 1                 2   2             15     51     4   75
Baden 124     12 1 1       1   7     2     4 3       1 1 2 28 187
Basel 16 1   9 89 183   1 1 1 1 5   1 3     14     2 2 1   2 30 362
Bern 18     316 2 3 15 5 2 7 1 11 5 1   1 2 11 5 7 1 2 10 16 8 39 488
Biel/Bienne 2     69 2 4 1 2     1   4         6   1     6     10 108
Bulle             2                                       2
Burgdorf 2     71     1         1       2   10             1 3 91
Chur                 1 44           1       3             49
Delémont               1     24   4                           29
Epalinges       2     8 17     5   17         1 1       205 15 2   273
Frauenfeld                               1       16         1 4 22
Glarus     1 1         19 1           8     1             8 39
Grenchen       32 1 2 1               1 1   76     1   1   3 8 127
Herisau   1 3                         1                   2 7
Lachen 12       3 3   1 3 4   2 1   2 16 1   54 1   1   1 4 34 143
Lamone           1   5   4   3                 155   2   1 3 174
Langenthal       74                           3                 77
Laufen         14                         13     1           28
Liestal 7     3 86 22         1 9   1       8 1       2   1 4 145
Luzern 9     13 1         7   260   15 24 4   1 9   3 3   3 37 43 432
Monthey               1                             4 11     16
Muri (AG) 2                                                   2
Nyon               3                             31       34
Olten 11     9 1   1       1             56             5   84
Porrentruy                     4                               4
Sarnen 1                     4   1 46                       52
Schaffhausen                                 6   1 2           3 12
Sion       1     1 4                             3 120 3   132
Solothurn 7     53 1 1 2       1 3 3   3 2   190     1   1   3 15 286
St. Gallen 3 5 16 2 1       2 5           124 10   2 51         5 19 245
Stans 2     2               6 1 46 6 1           4     1 1 70
Steinhausen 3     15 1 1       2   12 1   1 2   1 2           138 21 200
Sursee 11     5     1   2     93   3 3 1       1     1   4 5 130
Vernier       1   1 5 202         5 1             3   64 3 5 6 296
Villars-sur-Glâne       3     140 4         7                   20 4 3 4 185
Wetzikon (ZH)   1   1         1 1   3     1 6 3   4 3     2   1 182 209
Winterthur                                                   2 2
Zofingen 47                                 2             1   50
Zürich 42 1   31 16 19 2 10 3 15 6 22 1 2 11 24 12 5 45 9 5 1 9 3 90 781 1'165
∑ 758 9 20 736 231 254 180 257 34 99 45 458 49 72 103 200 34 431 146 97 173 65 364 177 342 1'336 6'670

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: 6'671

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
Neustark AG CHE-359.351.277 Bern 20.07.2026 Auditor switch Burgdorf
TMR Transports de Martigny et Régions SA CHE-103.100.934 Martigny 20.07.2026 Auditor switch Sion
Spitex Birseck AG CHE-373.704.647 Münchenstein 16.07.2026 First auditor Basel
ZOSTRA AG CHE-242.897.254 Zug 16.07.2026 First auditor Steinhausen
Artech Ultrasonic Systems AG CHE-102.588.912 Romanshorn 15.07.2026 Auditor switch St. Gallen
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
Tom Capital AG CHE-191.446.525 Küsnacht (ZH) 21.07.2026 Discontinued Zürich
Holcim Pension Fund CHE-109.712.260 Mägenwil 17.07.2026 Auditor switch Aarau
Holcim Supplementary Pension Fund CHE-109.723.631 Mägenwil 17.07.2026 Auditor switch Aarau
Badener Taxi AG CHE-101.292.567 Baden 16.07.2026 Auditor switch Baden
Stierli Autocenter AG CHE-393.718.434 Zofingen 14.07.2026 Auditor switch Zofingen