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Fact Sheet Testor Treuhand AG

Core Company Information
Company Name Testor Treuhand AG
UID CHE-102.155.312
Alternative / previous Names Testor Fiduciaire SA
Testor Immobilien und Treuhand AG
Testor Treuhand, Testor Fiduciaire
Domicile Basel
Canton BS
Legal Form Limited corporation
Inscription Date 28.09.1993
Website https://www.testor.ch
Phone +41 61 205 45 45
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)
  • reviews (according to ISRE 2400 or ISRE 2410)
  • audit of the equal pay analysis (art. 13d GEA)

Non-audit services

  • accounting and fiduciary services
  • consulting
  • tax consulting
  • legal advice
  • real estate (fiduciary, management)

Covered accounting standards

  • CO (Code of Obligations)
  • Swiss GAAP FER

Covered languages

  • German
  • French
  • English
  • Italian
FAOA Information
FAOA ID 501545
RAB Permission licensed audit expert
FAOA License active (since 10.12.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (0) -
Membership in Associations EXPERTsuisse
TREUHAND|SUISSE
Number of auditors with permission 7  (28.57 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 15.2 years (max.: 32.6 years)

Total number of statutory audit clients: 200 (Ranked #55 in Switzerland)

Change in number of audit engagements: -1 (since 31.12.2025), -3 (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 BL BS GE GR LU SG SO ZG ZH ∑
Limited corporation 7 2 40 69 1 1 1 1   1 2 125
Limited liability company     1 10               11
Foundation 4   13 28         1 1   47
Cooperative       12               12
Association       5               5
∑ 11 2 54 124 1 1 1 1 1 2 2 200

This audit firm is recorded as statutory auditor for 150 deleted entities. These are not included in the table above.

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Latest audit engagements
These are this auditor's latest audit engagements.
 
Client Name Client UID Domicile Start Date Type of switch Auditor Branch
Nigon Partner AG CHE-198.979.194 Basel 21.05.2026 First auditor Basel
Grether Liegenschaften AG CHE-393.292.702 Basel 12.05.2026 First auditor Basel
Foundation for Research & Development of African Medicinal Plants CHE-213.636.355 Basel 16.04.2026 First auditor Basel
Wohngenossenschaft Breite CHE-103.448.202 Basel 01.04.2026 Auditor switch Basel
Swiss BioQuant AG CHE-113.996.468 Reinach (BL) 03.02.2026 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
Kroo Security AG CHE-461.949.042 Muttenz 30.04.2026 Auditor switch Basel
Sammelstiftung RETIRA CHE-112.057.450 Speicher 25.02.2026 Auditor switch Basel
Baobab Books CHE-116.186.827 Basel 25.09.2025 Auditor switch Basel
Stiftung Schlossacker CHE-110.395.545 Binningen 14.08.2025 Auditor switch Basel
Inrag AG CHE-108.067.379 Muttenz 13.02.2025 Auditor switch Basel