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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  (19.94 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.5 years (max.: 33.7 years)

Total number of statutory audit clients: 6'641 (Ranked #1 in Switzerland)

Change in number of audit engagements: +39 (since 31.12.2025), +271 (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 546 8 9 485 163 135 141 195 20 62 31 314 42 53 80 130 25 292 117 69 124 49 269 125 273 830 4'587
Limited liability company 25     28 9 10 12 13 4 8 5 13 7 2 3 17 2 22 8 2 7 2 10 19 29 73 330
Foundation 124   9 132 36 90 15 31 7 17 10 81 1 15 21 39 4 86 15 14 30 11 57 22 36 266 1'169
Cooperative 28   1 34 10 6 8   1 6   24 1 1 1 3   12 4 6 4 3 7 2 3 89 254
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 1   4 57
∑ 755 9 20 732 230 255 182 246 34 98 46 457 51 72 106 197 33 432 145 93 173 65 363 173 351 1'323 6'641

This audit firm is recorded as statutory auditor for 2635 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'641 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   18   1   4   29 3 3 1 1 1   14 62 616
Affoltern am Albis 4       1                         1             3 22 31
Altdorf (UR) 1                 2   2             15     51     3   74
Baden 121     11 1 1       1   7     2     4 3       2 1 4 27 185
Basel 16 1   10 90 183     1 1 1 4   1 3     13     2 2 1   2 27 358
Bern 18     319 2 3 15 4 2 7 1 12 5 1   1 2 12 5 7 1 2 10 16 8 34 487
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   18         1 1       205 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 35 147
Lamone           1   5   5   3                 155   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   262   15 24 4   1 9   3 3   3 37 42 433
Monthey                                             4 9     13
Muri (AG) 2                                                   2
Nyon               3                             31       34
Olten 11     8 1   1       1             57             5   84
Porrentruy                     6                               6
Sarnen 1                     4   1 47                       53
Schaffhausen                                 6   1 1           2 10
Sion       1     1 4                             3 118 2   129
Solothurn 5     52 1 1 2       1 3 3   3 1   190     1   1   4 15 283
St. Gallen 3 5 16 1 1       2 5           122 10   2 48     1   5 19 240
Stans 2     2               6 1 46 8 1           4     1 1 72
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 5 194         6 1             3   62 3 5 7 288
Villars-sur-Glâne       4     140 3         7                   18 4 2 4 182
Wetzikon (ZH)   1   1         1 1   3     1 5 3   4 3     2   5 176 206
Winterthur                                                   2 2
Zofingen 47                                 2             2   51
Zürich 40 1   27 15 19 3 10 3 15 6 18 1 2 11 24 11 5 45 9 5 1 9 3 89 780 1'152
∑ 755 9 20 732 230 255 182 246 34 98 46 457 51 72 106 197 33 432 145 93 173 65 363 173 351 1'323 6'641

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: 6'642

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
Metron Zürich AG CHE-108.520.060 Zürich 15.04.2026 Auditor switch Baden
Route de la Gare Real Estate AG CHE-170.445.425 Schönenwerd 15.04.2026 First auditor Bern
Bellereaux SA CHE-103.611.347 Bardonnex 13.04.2026 Auditor switch Delémont
CLN Sicherheiten GmbH CHE-386.246.625 Freienbach 13.04.2026 First auditor Zürich
Fondation Pro-Gruyères CHE-109.752.696 Gruyères 10.04.2026 Auditor switch Bulle
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
OfK GmbH CHE-113.806.792 Zürich 15.04.2026 Auditor switch Zürich
Bassetti Schweiz AG CHE-103.642.543 Lugano 13.04.2026 Discontinued Lamone
Staldenwest AG CHE-105.948.243 Willisau 10.04.2026 Opting-out Luzern
Auto-Germann AG CHE-105.976.647 Hunzenschwil 09.04.2026 Auditor switch Aarau
aerem ag CHE-195.340.446 Baden 30.03.2026 Opting-out Baden