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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 333  (19.90 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.5 years (max.: 33.6 years)

Total number of statutory audit clients: 6'626 (Ranked #1 in Switzerland)

Change in number of audit engagements: +24 (since 31.12.2025), +290 (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 9 485 164 133 143 198 20 62 31 313 42 53 80 130 25 292 116 70 125 49 270 120 271 828 4'583
Limited liability company 25     28 9 10 13 13 4 8 5 13 7 2 3 17 2 22 7 2 7 2 9 19 29 70 326
Foundation 124   9 132 36 89 14 31 7 17 10 80 1 15 21 39 4 86 15 13 30 11 57 21 36 265 1'163
Cooperative 28   1 34 10 6 8   1 6   24 1 1 1 3   12 4 6 4 3 7 2 3 90 255
Association 29     47 10 13 1 6   3   22     1 3   15 1   3   14 4 10 61 243
Special legal forms 3 1 1 5 2 2 5 1 2 1   3   1   5 1 5   2 5   6 1   4 56
∑ 755 9 20 731 231 253 184 249 34 97 46 455 51 72 106 197 32 432 143 93 174 65 363 167 349 1'318 6'626

This audit firm is recorded as statutory auditor for 2627 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 6'626 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 442     12 11 13   1   5   17   1   4   29 3 3 1 1 1   14 63 621
Affoltern am Albis 4       1                         1             3 22 31
Altdorf (UR) 1                 2   2             15     51     3   74
Baden 118     11 1 1       1   7     2     4 3       2 1 4 26 181
Basel 16 1   10 89 182     1 1 1 4   1 3     13     2 2 1   2 27 356
Bern 18     318 2 4 15 4 2 7 1 12 5 1   1 2 11 5 7 1 2 10 16 8 34 486
Biel/Bienne 4     69 2 4 1 2     1   4         6         6     10 109
Bulle             1                                       1
Burgdorf 2     70     1         1       2   10             1 2 89
Chur                 1 42           1       3             47
Delémont                     23   4                           27
Epalinges       1     9 18     5   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       3 3   1 3 4   2 1   2 17 1   53 2   1 1 1 5 35 147
Lamone               5   5   3                 156   2   1 3 175
Langenthal       75                           3                 78
Laufen         14                         13     1           28
Liestal 6     3 87 23         1 7   1       8 1       2   1 4 144
Luzern 9     13 1         7   263   15 24 4   1 9   3 3   3 37 42 434
Monthey                                             4 9     13
Muri (AG) 2                                                   2
Nyon               3                             31       34
Olten 11     8 1   1       1             57             5   84
Porrentruy                     6                               6
Porrentruy               1                                     1
Sarnen 1                     4   1 47                       53
Schaffhausen                                 5   1 1           2 9
Sion       1     1 4                             3 115 2   126
Solothurn 5     52 1 1 2       1 3 3   3 1   191     1   1   3 15 283
St. Gallen 3 5 16 1 1       2 5           123 10   2 48     1   5 19 241
Stans 2     2               6 1 46 8 1           4     1 1 72
Steinhausen 3     15 1         2   12 1   1 3   1 2           141 22 204
Sursee 11     5     1   2     91   3 3 1       1     1   5 6 130
Vernier       1   1 6 197         6 1             3   62 2 5 6 290
Villars-sur-Glâne       4     142 3         7                   17 4 2 4 183
Wetzikon (ZH)   1   1         1 1   3     1 4 3   4 3     2   5 176 205
Winterthur                                                   1 1
Zofingen 45                                 2             2   49
Zürich 40 1   27 15 19 3 10 3 15 6 18 1 2 11 24 11 5 43 10 5 1 9 2 88 777 1'146
∑ 755 9 20 731 231 253 184 249 34 97 46 455 51 72 106 197 32 432 143 93 174 65 363 167 349 1'318 6'626

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, 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: 6'627

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
Ateliers Firmann SA CHE-492.922.688 Gruyères 05.03.2026 Auditor switch Bulle
MK1 Holding AG CHE-103.604.092 Basel 05.03.2026 Auditor switch Basel
SONMA AG CHE-351.067.973 Zug 05.03.2026 First auditor Steinhausen
Spital Oberengadin AG CHE-310.036.219 Samedan 04.03.2026 First auditor Chur
Zähringer Wohnbaugenossenschaft Rheinfelden CHE-103.594.111 Rheinfelden 03.03.2026 Auditor switch Basel
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
Profi Office GmbH CHE-109.260.565 Wohlen (AG) 05.03.2026 Auditor switch Solothurn
ASP Trade SA CHE-456.442.487 Manno 26.02.2026 Discontinued Lamone
Hafenbahn Schweiz AG CHE-218.049.573 Birsfelden 24.02.2026 Auditor switch Basel
Hocoma Medical GmbH in Liquidation CHE-489.706.316 Volketswil 24.02.2026 Discontinued Zürich
fondation Innovative Medicines for Tuberculosis (iM4TB) CHE-270.892.523 Ecublens (VD) 17.02.2026 Auditor switch Epalinges