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 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  (22.75 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 10.1 years (max.: 32.7 years)

Total number of statutory audit clients: 273 (Ranked #36 in Switzerland)

Change in number of audit engagements: -2 (since 31.12.2025), -2 (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 12 4 2 5 17 101 177
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       45 54
Association                                           1 1
∑ 10 2 1 6 2 4 2 2 4 2 1 1 2 10 1 3 14 5 2 5 20 174 273

This audit firm is recorded as statutory auditor for 139 deleted entities. These are not included in the table above.

Display client list

Related audit firms

Network:

Total number of audit engagements across the network: 303

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
Wohnbaugenossenschaft Sandhof CHE-102.247.026 Wädenswil 19.02.2026 Auditor switch Zürich
VitaBase AG CHE-213.332.180 Uster 23.01.2026 First auditor Zürich
collana health AG CHE-395.330.868 Bern 13.01.2026 Auditor switch Zürich
collana solutions AG CHE-110.511.337 Wollerau 08.01.2026 Auditor switch Zürich
MegaCAD Schweiz AG CHE-102.297.395 Mettmenstetten 17.12.2025 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
AF AcquiCo Gamma AG CHE-417.462.919 Zürich 03.03.2026 Auditor switch Zürich
CoVest Sakura AG CHE-375.813.709 Zürich 02.03.2026 Auditor switch Zürich
Robert & Schneider SA CHE-340.151.486 Crémines 11.02.2026 Auditor switch Zürich
Mining Technology S.I.M. AG CHE-110.044.034 Zürich 22.01.2026 Opting-out Zürich
Speich Copy Print AG CHE-189.187.136 Wallisellen 27.11.2025 Auditor switch Zürich