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Fact Sheet ATO Treuhand AG

Core Company Information
Company Name ATO Treuhand AG
UID CHE-107.809.581
Alternative / previous Names Ato Datenservice AG
Ato Treuhand & Datenservice AG
Domicile Bern
Canton BE
Legal Form Limited corporation
Inscription Date 02.11.1967
FAOA Information
FAOA ID 501261
RAB Permission licensed audit expert
FAOA License active (since 20.12.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (0) -
Membership in Associations EXPERTsuisse
TREUHAND|SUISSE
Number of auditors with permission 3  (11.00 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 14.4 years (max.: 32.2 years)

Total number of statutory audit clients: 33 (Ranked #186 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 BE FR VD ZG ∑
Limited corporation 1 11 1     13
Limited liability company   3   1   4
Foundation   14   1 1 16
∑ 1 28 1 2 1 33

This audit firm is recorded as statutory auditor for 17 deleted entities. These are not included in the table above.

Display client list

Latest audit engagements
These are this auditor's latest audit engagements.
 
Client Name Client UID Domicile Start Date Type of switch Auditor Branch
Stiftung für bürgerliche Politik CHE-109.980.582 Zug 11.12.2024 Auditor switch Bern
Stiftung für die Betreuung Betagter Bern West CHE-395.949.996 Bern 29.06.2023 First auditor Bern
Isler & Marthaler GmbH CHE-108.424.781 Bern 20.06.2023 Auditor switch Bern
Stiftung Bilas CHE-434.188.659 Bern 27.12.2022 First auditor Bern
Fähribeizli AG CHE-197.301.983 Muri bei Bern 19.12.2022 Auditor switch Bern
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
gfs.bern ag CHE-111.727.992 Bern 04.08.2026 Auditor switch Bern
RefBernImmo AG CHE-460.709.096 Bern 27.03.2026 Auditor switch Bern
Verein für die Betreuung Betagter in Bümpliz CHE-106.119.752 Bern 13.08.2025 Discontinued Bern
Augen Zentrum Fankhauser AG CHE-114.125.884 Bern 17.01.2025 Auditor switch Bern
Augen Zentrum Gutenberg AG CHE-371.269.155 Bern 17.01.2025 Auditor switch Bern