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Fact Sheet Testaris AG

Core Company Information
Company Name Testaris AG
UID CHE-245.886.063
Alternative / previous Names -
Domicile Basel
Canton BS
Legal Form Limited corporation
Inscription Date 21.03.2017
FAOA Information
FAOA ID 505263
RAB Permission licensed audit expert
FAOA License active (since 22.05.2018)
Link to FAOA website View auditor profile at FAOA
Branch offices (0) -
Membership in Associations EXPERTsuisse
Number of auditors with permission 4  (25.75 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 6.6 years (max.: 17.4 years)

Total number of statutory audit clients: 103 (Ranked #111 in Switzerland)

Change in number of audit engagements: +1 (since 31.12.2025), +12 (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 LU SO SZ TI ZG ZH
Limited corporation 4 1 8 34 3 2 1 2 1 13 12 81
Limited liability company     1 9           6   16
Foundation       5               5
Association       1               1
4 1 9 49 3 2 1 2 1 19 12 103

This audit firm is recorded as statutory auditor for 17 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: 282

Same domicile: 

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
BYM Global SA CHE-158.355.024 Meyrin 12.02.2026 Auditor switch Basel
Einundzwanzigste PCE River Cruiser AG CHE-487.235.139 Basel 30.12.2025 First auditor Basel
Zwanzigste PCE River Cruiser AG CHE-433.646.949 Basel 29.12.2025 First auditor Basel
Immo 4132 AG CHE-311.432.227 Basel 12.12.2025 First auditor Basel
Neunzehnte PCE River Cruiser AG CHE-168.635.117 Basel 04.12.2025 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
Morger Partner Architekten AG CHE-112.393.617 Basel 14.02.2025 Auditor switch Basel
klingler consultants ag in Liquidation CHE-115.600.586 Zürich 27.12.2024 Opting-out Basel
Quadrimontagen AG CHE-106.018.772 Mesocco 16.12.2024 Discontinued Basel
André Koch AG CHE-105.981.832 Urdorf 13.11.2024 Auditor switch Basel
mpa group ag CHE-338.608.192 Basel 24.05.2024 Opting-out Basel