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Fact Sheet ORGANISATIONS UND TREUHAND AG

Core Company Information
Company Name ORGANISATIONS UND TREUHAND AG
UID CHE-105.776.249
Alternative / previous Names Organisations und Treuhand AG (until 30.10.1997)
OTAG Treuhand (until 19.02.1998)
Domicile Klingnau
Canton AG
Legal Form Limited corporation
Inscription Date 31.12.1965
Website https://www.otag.ch
Phone +41 56 204 05 40
Offered services

Audit services

  • limited statutory examination (art. 727a CO)
  • ordinary statutory audit (art. 727 CO)
  • audit of incorporation or capital increase reports (art. 635a and 652f CO)
  • audit of capital decreases (art. 653m CO)
  • audit in relation to early distribution of assets (art. 745 CO)
  • audits in the context of the merger law
  • limited statutory examination according to art. 725a CO
  • audit of the equal pay analysis (art. 13d GEA)

Non-audit services

  • accounting and fiduciary services
  • consulting
  • tax consulting
  • due diligence
  • valuation services

Covered accounting standards

  • CO (Code of Obligations)
  • Swiss GAAP FER

Covered languages

  • German
  • English
FAOA Information
FAOA ID 501062
RAB Permission licensed audit expert
FAOA License active (since 16.11.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (1) ORGANISATIONS UND TREUHAND AG (CHE-408.651.344) in Baden (AG)
ORGANISATIONS UND TREUHAND AG (CHE-235.104.492) in Mägenwil (AG)
Membership in Associations EXPERTsuisse
Number of auditors with permission 4  (30.25 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 12 years (max.: 31.5 years)

Total number of statutory audit clients: 121 (Ranked #98 in Switzerland)

Change in number of audit engagements: +1 (since 31.12.2025), +6 (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 BS LU ZG ZH
Limited corporation 81 1   3 2 15 102
Limited liability company 6           6
Foundation 8 3 1       12
Cooperative 1           1
96 4 1 3 2 15 121

This audit firm is recorded as statutory auditor for 38 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 121 statutory audits are performed by the branch offices as indicated in the table below.

  AG BE BS LU ZG ZH
Baden 25 4 1 2 2 9 43
Klingnau 71     1   6 78
96 4 1 3 2 15 121

Show client list for Baden, Klingnau.

Related audit firms

Direct personal relationship:

Latest audit engagements
These are this auditor's latest audit engagements.
 
Client Name Client UID Domicile Start Date Type of switch Auditor Branch
Eichhofpraxis AG CHE-277.776.415 Kriens 26.02.2026 First auditor Baden
Diebold & Zgraggen Gartenbau AG CHE-107.721.779 Fislisbach 03.12.2025 Auditor switch Baden
KR Decken- und Wandelemente GmbH CHE-104.753.458 Muri (AG) 20.11.2025 Auditor switch Baden
Vögeli Holzbau AG CHE-175.202.108 Böttstein 23.09.2025 Auditor switch Baden
Vögeli Holzbau AG Mellingen CHE-283.660.927 Mellingen 23.09.2025 Auditor switch Baden
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
PROCLOUD AG CHE-421.717.382 Lenzburg 17.11.2025 Auditor switch Baden
Howden Broker Service Schweiz AG CHE-110.486.395 Schöftland 28.03.2025 Auditor switch Klingnau
Ampegon Power Electronics AG CHE-310.342.455 Baden 29.11.2024 Auditor switch Baden
reha at home ag CHE-382.392.529 Baden 02.04.2024 Auditor switch Klingnau
B.S. Venture Capital AG in Liquidation CHE-110.153.686 Zürich 26.03.2024 Auditor switch Klingnau