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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  (24.60 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 8.8 years (max.: 32.2 years)

Total number of statutory audit clients: 369 (Ranked #21 in Switzerland)

Change in number of audit engagements: +2 (since 31.12.2025), +10 (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 SO SZ TG ZG ZH ∑
Limited corporation 8 4 102 82 3 3 1 1 10 1 2 1 9 227
Limited liability company 3   20 10 17     2 2 1   1 2 58
Foundation 1 1 26 30         2       1 61
Cooperative     3 5                 1 9
Association 1   6 5         1       1 14
∑ 13 5 157 132 20 3 1 3 15 2 2 2 14 369

This audit firm is recorded as statutory auditor for 83 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 369 statutory audits are performed by the branch offices as indicated in the table below.

  AG BE BL BS LU NW OW SG SO SZ TG ZG ZH ∑
Basel 1 2 11 60   2 1   12       2 91
Liestal 12 3 146 72 20 1   3 3 2 2 2 12 278
∑ 13 5 157 132 20 3 1 3 15 2 2 2 14 369

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
OF-Software AG CHE-104.967.278 Birsfelden 02.03.2026 Auditor switch Basel
Hafenbahn Schweiz AG CHE-218.049.573 Birsfelden 24.02.2026 Auditor switch Basel
metrobasel CHE-114.522.512 Basel 13.02.2026 Auditor switch Basel
Jonasch&Gebler AG CHE-466.053.963 Allschwil 16.01.2026 First auditor Basel
Cenci AG CHE-105.825.103 Riehen 08.01.2026 Auditor switch Liestal
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
Schweizerische Rheinhäfen CHE-114.454.804 Birsfelden 17.02.2026 Auditor switch Basel
insta.ch AG in Liquidation CHE-105.867.001 Pratteln 13.02.2026 Discontinued Liestal
Wohngenossenschaft Grünfeld CHE-101.922.931 Riehen 12.11.2025 Auditor switch Basel
Stiftung zur Hard CHE-108.009.910 Birsfelden 09.09.2025 Auditor switch Liestal
Alters- und Pflegeheim Madle, Pratteln CHE-108.041.457 Pratteln 29.08.2025 Auditor switch Liestal