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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 323  (20.45 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.4 years (max.: 33.5 years)

Total number of statutory audit clients: 6'605 (Ranked #1 in Switzerland)

Change in number of audit engagements: +2 (since 31.12.2025), +312 (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 547 8 9 490 164 131 140 196 20 61 30 312 42 53 80 129 25 290 115 70 126 49 265 120 271 823 4'566
Limited liability company 25     28 9 11 13 13 4 8 6 12 7 1 3 16 2 22 6 2 7 2 9 19 29 73 327
Foundation 125   10 131 35 89 14 32 7 17 11 80 1 15 20 39 4 87 15 13 30 11 56 21 36 265 1'164
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     46 10 13 1 6   3   22     1 3   14 1   3   14 4 10 61 241
Special legal forms 2 1 1 5 1 2 5 1 2 1   3   1   5 1 5   2 5   6 1   4 54
∑ 756 9 21 734 229 252 181 248 34 96 47 453 51 71 105 195 32 430 141 93 175 65 357 167 349 1'314 6'605

This audit firm is recorded as statutory auditor for 2620 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'605 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 443     12 11 13   1   5   17   1   4   28 3 3 1 1 1   14 63 621
Affoltern am Albis 4       1                                       3 22 30
Altdorf (UR) 1                 2   2             15     51     3   74
Baden 116     11 1 1       1   7     2     4 2       2 1 4 26 178
Basel 15 1   10 88 182     1 1 1 4   1 3     13     2 2 1   2 27 354
Bern 18     315 2 4 15 4 2 7 1 12 5 1   1 2 11 5 7 1 2 10 16 8 34 483
Biel/Bienne 4     69 2 4 1 1     1   4         6         6     10 108
Burgdorf 2     72     1         1       2   9             1 2 90
Chur                 1 41           1       3             46
Delémont                     19   4                           23
Epalinges       1     8 18     6   18         1 1       205 14 2   274
Frauenfeld                               1       15         1 4 21
Glarus     1 1         19             8     1             8 38
Grenchen       31 1 2 1               1 1   76     1   1   3 7 125
Herisau   1 3                         1                   2 7
Lachen 12   1   3 3   1 3 4   2 1   1 17 1   53 2   1 1 1 5 34 146
Lamone               5   5   2                 157   2   1 3 175
Langenthal       75                           3                 78
Laufen         14                         13     1           28
Liestal 7     3 86 23         1 6   1       8 1       3   1 4 144
Luzern 9     13 1         7   263   14 24 4   1 9   3 3   3 37 42 433
Monthey                                             3 9     12
Muri (AG) 2                                                   2
Nyon               3                             31       34
Olten 11     11 1   1       1             57             5   87
Porrentruy               1                                     1
Porrentruy                     10                               10
Sarnen 1                     4   1 47                       53
Schaffhausen                                 5   1 1           2 9
Sion       1     1 4                             3 115 2   126
Solothurn 6     52 1 1 2       1 3 3   3 1   192     1   1   3 15 285
St. Gallen 3 5 16 1 1       2 5           121 10   2 48     1   5 19 239
Stans 2     2               6 1 46 8 1           4     1 1 72
Steinhausen 3     15 1         2   12 1   1 3   1 2           139 22 202
Sursee 11     5     1   2     91   3 3 1       1     1   5 6 130
Vernier       1     6 197         6 1             3   57 2 5 7 285
Villars-sur-Glâne       4     141 3         7                   17 4 2 4 182
Wetzikon (ZH)   1   1         1 1   3     1 4 3   4 3     2   6 173 203
Winterthur                                                   1 1
Zofingen 43                                 2             2   47
Zürich 43 1   28 15 19 3 10 3 15 6 18 1 2 11 24 11 5 42 10 5 1 9 2 89 776 1'149
∑ 756 9 21 734 229 252 181 248 34 96 47 453 51 71 105 195 32 430 141 93 175 65 357 167 349 1'314 6'605

Show client list for Aarau, Affoltern am Albis, Altdorf (UR), Baden, Basel, Bern, Biel/Bienne, Burgdorf, Chur, Delémont, Epalinges, Frauenfeld, Glarus, Grenchen, Herisau, Lachen, Lamone, Langenthal, Laufen, Liestal, Luzern, Monthey, Muri (AG), Nyon, Olten, Porrentruy, 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: 6'606

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
a-connect ag CHE-109.611.185 Zürich 23.01.2026 Auditor switch Zürich
Biodelphis Therapeutics SA CHE-444.253.910 Lausanne 23.01.2026 First auditor Lamone
FURKA Reibbeläge AG CHE-109.273.711 Breitenbach 23.01.2026 Auditor switch Basel
Horia Holding Sàrl CHE-455.127.126 Courtételle 23.01.2026 First auditor Delémont
Pflegeheim Sennhof AG CHE-114.639.545 Vordemwald 23.01.2026 Auditor switch Zofingen
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
Henley & Partners International AG CHE-324.248.590 Baar 22.01.2026 Auditor switch Wetzikon (ZH)
Audiovis Lernstudio GmbH CHE-169.548.426 Uster 21.01.2026 Auditor switch Lachen
Fondation Suisse-Santé-Haïti CHE-115.603.573 Biel/Bienne 21.01.2026 Discontinued Biel/Bienne
Helpforce AG CHE-114.558.527 Freienbach 21.01.2026 Auditor switch Lachen
Network 41 AG CHE-103.807.459 Sursee 20.01.2026 Auditor switch Sursee