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Fact Sheet TRETOR AG

Core Company Information
Company Name TRETOR AG
UID CHE-108.227.200
Alternative / previous Names H & H Treuhand AG (until 08.12.1999)
Domicile Liestal
Canton BL
Legal Form Limited corporation
Inscription Date 23.02.1995
Takeovers: TRETOR AG Basel (CHE-106.018.967), per 30.06.2016
Treuhand AG Liestal (CHE-107.791.308), per 19.09.2007
FAOA Information
FAOA ID 500336
RAB Permission licensed audit expert
FAOA License active (since 19.11.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (1) TRETOR AG (CHE-302.042.904) in Basel (BS)
Membership in Associations EXPERTsuisse
Number of auditors with permission 15  (24.87 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 8.9 years (max.: 32.7 years)

Total number of statutory audit clients: 373 (Ranked #21 in Switzerland)

Change in number of audit engagements: +6 (since 31.12.2025), +11 (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 LU NW OW SG SH SO SZ TG ZG ZH ∑
Limited corporation 6 4 102 82 3 2 1 1 1 11 1 2 1 9 226
Limited liability company 3   22 11 17     3   3 1   1 2 63
Foundation 1 1 26 30           2       1 61
Cooperative     3 5                   1 9
Association 1   6 5           1       1 14
∑ 11 5 159 133 20 2 1 4 1 17 2 2 2 14 373

This audit firm is recorded as statutory auditor for 87 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 373 statutory audits are performed by the branch offices as indicated in the table below.

  AG BE BL BS LU NW OW SG SH SO SZ TG ZG ZH ∑
Basel 1 2 12 63   2 1     14       2 97
Liestal 10 3 147 70 20     4 1 3 2 2 2 12 276
∑ 11 5 159 133 20 2 1 4 1 17 2 2 2 14 373

Show client list for Basel, Liestal.

Latest audit engagements
These are this auditor's latest audit engagements.
 
Client Name Client UID Domicile Start Date Type of switch Auditor Branch
Kinvar AG CHE-103.940.621 Muttenz 07.08.2026 Auditor switch Basel
SissaMed AG CHE-184.415.962 Sissach 24.07.2026 First auditor Liestal
Mayr Kupplungen AG CHE-107.939.019 Neuhausen am Rheinfall 21.07.2026 Auditor switch Liestal
mondo a Tierpraxis GmbH CHE-162.765.833 Riehen 08.07.2026 First auditor Basel
SES-Sterling Beteiligungen AG CHE-480.598.552 Metzerlen-Mariastein 30.06.2026 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
Job Factory Basel AG CHE-105.547.708 Basel 15.07.2026 Auditor switch Liestal
Flexpo AG CHE-402.136.121 Spreitenbach 22.06.2026 Auditor switch Liestal
Schweisstechnik Kohler Martin AG CHE-103.878.867 Romanshorn 20.04.2026 Opting-out Liestal
Phoenix SysTec AG CHE-349.990.085 Basel 30.03.2026 Auditor switch Liestal
Schweizerische Rheinhäfen CHE-114.454.804 Birsfelden 17.02.2026 Auditor switch Basel