Now with auditor networks!

Get detailed statistics about any audit firm in Switzerland. Just type the auditor name in the field below and off you go!

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 323  (20.44 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.4 years (max.: 33.4 years)

Total number of statutory audit clients: 6'601 (Ranked #1 in Switzerland)

Change in number of audit engagements: -2 (since 31.12.2025), +306 (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 9 488 164 132 137 196 20 60 32 314 42 53 80 129 25 289 116 71 124 49 265 120 272 825 4'566
Limited liability company 25     28 9 11 13 13 4 8 5 12 6 1 3 16 2 22 6 2 7 2 9 19 29 74 326
Foundation 125   10 132 34 89 13 32 7 16 11 80 1 15 20 38 4 87 15 13 30 11 56 21 36 266 1'162
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 60 240
Special legal forms 2 1 1 5 1 2 5 1 2 1   3   1   5 1 5   2 5   6 1   4 54
∑ 755 9 21 733 228 253 177 248 34 94 48 455 50 71 105 194 32 429 142 94 173 65 357 167 350 1'317 6'601

This audit firm is recorded as statutory auditor for 2618 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'601 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     13 11 13   1   5   17   1   4   28 3 3   1 1   14 63 621
Affoltern am Albis 4       1                                       3 23 31
Altdorf (UR) 1                 2   2             15     51     3   74
Baden 116     10 1 1       1   7     2     4 2       2 1 4 26 177
Basel 15 1   10 88 182     1 1 1 4   1 3     11     2 2 1   2 27 352
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     70 2 4 1 1     1   3         6         6     10 108
Burgdorf 2     71     1         1       2   9             1 2 89
Chur                 1 41           1       3             46
Delémont                     19   4                           23
Epalinges       1     8 18     6   18         1 1       206 14 2   275
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   54 2   1 1 1 5 35 148
Lamone               5   5   2                 157   1   1 3 174
Langenthal       75                           3                 78
Laufen         14                         14                 28
Liestal 7     3 85 23         2 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     10 1   1       1             57             5   86
Porrentruy                     10                               10
Porrentruy               1                                     1
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           120 10   2 48     1   5 19 238
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     93   3 3 1       1     1   5 6 132
Vernier       1     6 197         6 1             3   57 2 5 7 285
Villars-sur-Glâne       4     137 3         7                   17 4 2 4 178
Wetzikon (ZH)   1   1         1 1   3     1 4 3   4 3     2   7 174 205
Winterthur                                                   1 1
Zofingen 42                                 2             2   46
Zürich 43 1   28 15 20 3 10 3 13 6 18 1 2 11 24 11 5 42 11 5 1 9 2 89 776 1'149
∑ 755 9 21 733 228 253 177 248 34 94 48 455 50 71 105 194 32 429 142 94 173 65 357 167 350 1'317 6'601

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: 6'602

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
Gesellschaft für erschwingliches Wohnen AG CHE-424.419.946 Schlieren 12.01.2026 First auditor Zürich
Kägi & Co, Heizung Sanitär AG CHE-108.680.108 Wädenswil 12.01.2026 Auditor switch Wetzikon (ZH)
Marein AG CHE-107.950.676 Spreitenbach 12.01.2026 Auditor switch Zürich
MINDBRIDGE CHE-395.297.320 Luzern 12.01.2026 First auditor Wetzikon (ZH)
Werner Oskar Weber Holding AG CHE-298.221.324 Zug 12.01.2026 Auditor switch Wetzikon (ZH)
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
Delrin Switzerland Sàrl CHE-397.158.729 Meyrin 09.01.2026 Auditor switch Vernier
Henley & Partners Switzerland AG CHE-105.109.225 Zürich 09.01.2026 Auditor switch Wetzikon (ZH)
Hüba AG CHE-292.976.192 Luzern 09.01.2026 Auditor switch Aarau
Alfina AG CHE-102.744.299 Basel 08.01.2026 Auditor switch Basel
ender diagnostics ag CHE-313.908.198 Bern 08.01.2026 Auditor switch Bern