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Fact Sheet Grant Thornton AG

Core Company Information
Company Name Grant Thornton AG
UID CHE-107.841.337
Alternative / previous Names Grant Thornton SA, Grant Thornton Ltd
Bankrevisions- und Treuhand AG, Révision de Banques et Fiduciaire SA, Bank Auditors and Fiduciary Ltd (until 15.07.2014)
Grant Thornton Bankrevision AG, Grant Thornton Bank Audit Ltd., Grant Thornton Révision Bancaire SA (until 24.06.2019)
Grant Thornton Ltd., Grant Thornton Ltd., Grant Thornton SA (until 22.10.2025)
Domicile Zürich
Canton ZH
Legal Form Limited corporation
Inscription Date 25.10.1971
Takeovers: Grant Thornton Advisory AG (CHE-100.726.095), per 24.06.2019
Grant Thornton AG (CHE-109.041.827), per 24.06.2019
Grant Thornton Spiess SA (CHE-102.004.156), per 02.06.2021
GwG Prüfung und Beratung AG (CHE-284.229.555), per 07.03.2025
TEBOR Treuhand AG (CHE-106.237.682), per 18.06.2018
FAOA Information
FAOA ID 500038
RAB Permission state-regulated audit firm
FAOA License active (since 26.11.2007)
Link to FAOA website View auditor profile at FAOA
Branch offices (2) Grant Thornton AG (CHE-394.243.600) in Buchs (SG) (SG)
Grant Thornton AG (CHE-153.284.948) in Genève (GE)
Membership in Associations EXPERTsuisse
IIAS
Number of auditors with permission 40  (15.35 audit engagements per employee on average)
Auditor Statistics

Average engagement duration: 7.7 years (max.: 30.3 years)

Total number of statutory audit clients: 614 (Ranked #11 in Switzerland)

Change in number of audit engagements: -5 (since 31.12.2025), +20 (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 AI AR BE BL BS FR GE GR JU LU NE NW OW SG SH SO SZ TG TI UR VD VS ZG ZH ∑
Limited corporation 5 2 1 6 1 14   48 17 1 8 6   1 35 1 4 22 3 5 1 20 1 111 118 431
Limited liability company       1 1 2 2 7 1   2 3 2   3 2   2   2   8   25 22 85
Foundation           2   18     2   2 1 3 1 4 3 1     1   17 27 82
Cooperative           1                         1         1 1 4
Association       1       1                               3 6 11
Special legal forms                                   1               1
∑ 5 2 1 8 2 19 2 74 18 1 12 9 4 2 41 4 8 28 5 7 1 29 1 157 174 614

This audit firm is recorded as statutory auditor for 116 deleted entities. These are not included in the table above.

Display client list

Audit Engagements by Branch Office

The 614 statutory audits are performed by the branch offices as indicated in the table below.

  AG AI AR BE BL BS FR GE GR JU LU NE NW OW SG SH SO SZ TG TI UR VD VS ZG ZH ∑
Buchs (SG)       1       1 17 1         25       2 1   1   2 3 54
Genève       1     2 62       7               2   26   6 5 111
Zürich 5 2 1 6 2 19   11 1   12 2 4 2 16 4 8 28 3 4 1 2 1 149 166 449
∑ 5 2 1 8 2 19 2 74 18 1 12 9 4 2 41 4 8 28 5 7 1 29 1 157 174 614

Show client list for Buchs (SG), Genève, Zürich.

Related audit firms

Network:

Total number of audit engagements across the network: 616

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
Vaximm AG CHE-114.477.515 Basel 16.01.2026 Auditor switch Zürich
Petraco Oil Company SA CHE-410.059.505 Lugano 06.01.2026 Auditor switch Zürich
Laka Wealth SA CHE-323.644.836 Genève 30.12.2025 First auditor Genève
Summit Trust International SA CHE-105.219.888 Genève 23.12.2025 Auditor switch Genève
MANGO SUISSE SA CHE-101.380.208 Lancy 22.12.2025 Auditor switch Genève
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
Chest Holding AG CHE-113.947.582 Zürich 16.01.2026 Auditor switch Zürich
Nordsüd Asset Management AG CHE-103.552.489 Zürich 12.01.2026 Auditor switch Zürich
TIB-TEC AG CHE-162.662.328 Baar 12.01.2026 Discontinued Zürich
von Rundstedt & Partner Schweiz AG CHE-194.574.846 Zürich 09.01.2026 Auditor switch Zürich
TRIUS Partners AG CHE-183.125.349 Zug 06.01.2026 Auditor switch Zürich