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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	42 (15.12 audit engagements per employee on average)

Auditor Statistics

Average engagement duration: 7.7 years (max.: 30.6 years)

Total number of statutory audit clients: 635 (Ranked #11 in Switzerland)

Change in number of audit engagements: +16 (since 31.12.2025), +34 (over the last 12 months)

Details regarding the distribution of the audit engagements across legal forms and cantons are depicted in the table below.

This audit firm is recorded as statutory auditor for 119 deleted entities. These are not included in the table above.

Audit Engagements by Branch Office

The 635 statutory audits are performed by the branch offices as indicated in the table below.

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

Related audit firms

Network:

Total number of audit engagements across the network: 636

Further connections:

V.T. Verwaltungs-Treuhand AG in Liquidation (CHE-102.096.187), 0 audit engagements
awit wirtschaftsprüfer AG (CHE-102.730.038), 0 audit engagements
Amberg Controlling AG (CHE-107.958.117), 0 audit engagements
ReviTrust Audit AG (CHE-114.760.750), 0 audit engagements
Fasser & Leuenberger, Steuerberatung, Buchhaltung, Revisionen (ADM-309.347.664), 0 audit engagements
Grant Thornton Wirtschaftsprüfung AG (CHE-106.671.133), 0 audit engagements

Latest audit engagements

These are this auditor's latest audit engagements.

Client Name	Client UID	Domicile	Start Date	Type of switch	Auditor Branch
WIDMER CARROSSERIE AG	CHE-180.859.716	Neuenhof	08.05.2026	First auditor	Zürich
ENERGIA TRADING INTERNATIONAL SA	CHE-318.010.726	Genève	28.04.2026	Auditor switch	Genève
ampia Freizügigkeitsstiftung	CHE-415.545.894	Küssnacht (SZ)	27.04.2026	First auditor	Zürich
Finacreta AG	CHE-102.632.890	Glarus	23.04.2026	Auditor switch	Buchs (SG)
Nueva AG	CHE-103.267.155	Glarus	23.04.2026	Auditor switch	Buchs (SG)

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
MindMaze Group SA en liquidation	CHE-477.979.617	Lausanne	12.05.2026	Discontinued	Genève
MindMaze SA en liquidation	CHE-261.160.131	Lausanne	12.05.2026	Discontinued	Genève
Amasus Investment AG in Liquidation	CHE-219.849.381	Zürich	04.05.2026	Opting-out	Zürich
Société Nautique de Genève	CHE-110.502.404	Genève	17.04.2026	Auditor switch	Genève
LABHA AG	CHE-112.468.735	Zürich	01.04.2026	Auditor switch	Zürich