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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  (24.93 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 8.8 years (max.: 32.9 years)

Total number of statutory audit clients: 374 (Ranked #19 in Switzerland)

Change in number of audit engagements: +7 (since 31.12.2025), +8 (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 FR LU NW OW SG SH SO SZ TG ZG ZH ∑
Limited corporation 7 4 102 83 1 3 2 1 1 1 12 1 2 1 9 230
Limited liability company 3   23 11   16     3   4 1   1 2 64
Foundation 1 1 25 27             2       1 57
Cooperative     3 5                     1 9
Association 1   6 5             1       1 14
∑ 12 5 159 131 1 19 2 1 4 1 19 2 2 2 14 374

This audit firm is recorded as statutory auditor for 89 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 374 statutory audits are performed by the branch offices as indicated in the table below.

  AG BE BL BS FR LU NW OW SG SH SO SZ TG ZG ZH ∑
Basel 1 2 12 62     2 1     14       2 96
Liestal 11 3 147 69 1 19     4 1 5 2 2 2 12 278
∑ 12 5 159 131 1 19 2 1 4 1 19 2 2 2 14 374

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
s + m tiefbau gmbh CHE-112.467.138 Liestal 06.10.2026 First auditor Liestal
Steiner Logistic AG CHE-473.637.448 Zeiningen 14.09.2026 Auditor switch Liestal
Ärztezentrum Lüsselpark AG CHE-140.033.555 Breitenbach 11.09.2026 Auditor switch Liestal
Immenbach AG CHE-109.875.749 Riehen 09.09.2026 Auditor switch Liestal
Peter Tschudin AG CHE-449.282.072 Sissach 01.09.2026 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
Ergolz Klinik AG CHE-107.614.161 Liestal 13.10.2026 Auditor switch Liestal
Stiftung Luftseilbahn Reigoldswil-Wasserfallen LRW CHE-106.123.825 Reigoldswil 08.10.2026 Auditor switch Liestal
Liegenschaftsstiftung Job Factory CHE-423.456.092 Basel 18.09.2026 Auditor switch Liestal
Stiftung Job Training CHE-109.491.768 Basel 18.09.2026 Auditor switch Liestal
Job Factory Basel AG CHE-105.547.708 Basel 15.07.2026 Auditor switch Liestal