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Fact Sheet Ostschweizerische Treuhand Zürich AG

Core Company Information
Company Name Ostschweizerische Treuhand Zürich AG
UID CHE-102.503.904
Alternative / previous Names -
Domicile Zürich
Canton ZH
Legal Form Limited corporation
Inscription Date 23.11.1992
FAOA Information
FAOA ID 500640
RAB Permission licensed audit expert
FAOA License active (since 26.10.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (0) -
Membership in Associations EXPERTsuisse
Number of auditors with permission 12  (22.83 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 9.9 years (max.: 32.5 years)

Total number of statutory audit engagements: 274 (Ranked #35 in Switzerland)

Change in number of audit engagements: -3 (since 31.12.2024), -1 (over the last 12 months)

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 LU NW OW SG SH SO SZ TG VD VS ZG ZH ∑
Limited corporation 6 2   4 1 2 2 2 4 1 1   1 6 1 3 11 4 2 5 18 103 179
Limited liability company 1                         2     2       2 1 8
Foundation 1   1 1               1 1 1             1 26 33
Cooperative 2     1 1 2       1       1       1       44 53
Association                                           1 1
∑ 10 2 1 6 2 4 2 2 4 2 1 1 2 10 1 3 13 5 2 5 21 175 274

This audit firm is recorded as statutory auditor for 137 deleted entities. These are not included in the table above.

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Related audit firms

Network:

Total number of audit engagements across the network: 304

Direct personal relationship:

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
arbatherm AG CHE-106.023.626 Winterthur 25.11.2025 Auditor switch Zürich
Silva 10 AG CHE-303.661.978 Freienbach 18.11.2025 Auditor switch Zürich
ServerBase AG CHE-115.419.029 Bachenbülach 14.11.2025 First auditor Zürich
Augenarzt-Praxis Stemmle AG CHE-427.034.933 Zürich 12.11.2025 Auditor switch Zürich
Greymon AG CHE-260.427.610 Freienbach 12.11.2025 Auditor switch Zürich
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
Speich Copy Print AG CHE-189.187.136 Wallisellen 27.11.2025 Auditor switch Zürich
Copytrend AG Basel CHE-100.818.030 Basel 26.11.2025 Auditor switch Zürich
Copytrend AG Zürich CHE-107.908.059 Wallisellen 26.11.2025 Auditor switch Zürich
Copytrend SA Genève CHE-105.976.392 Genève 25.11.2025 Auditor switch Zürich
Copytrend AG Bern, Köniz CHE-101.419.661 Köniz 24.11.2025 Auditor switch Zürich