Fact Sheet Treuhand- und Revisionsgesellschaft Mattig-Suter und Partner

Average engagement duration: 11.9 years (max.: 33.6 years)

Total number of statutory audit clients: 281 (Ranked #33 in Switzerland)

Change in number of audit engagements: -6 (since 31.12.2025), -1 (over the last 12 months)

Number of audit clients listed on a Swiss stock exchange: 2 (thereof 0 in the SMI, 0 in the SMI Expanded and 0 in the SPI)

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 106 deleted entities. These are not included in the table above.

Display client list

The 281 statutory audits are performed by the branch offices as indicated in the table below.

Show client list for Brig-Glis, Freienbach, Schwyz.

Network:

• Retraco AG (CHE-102.598.141), 26 audit engagements
• Treuhand- und Revisionsgesellschaft Mattig-Suter und Partner, Zürich AG (CHE-107.823.374), 38 audit engagements
• SWA Swiss Auditors AG (CHE-112.140.677), 65 audit engagements

Total number of audit engagements across the network: 410

Direct personal relationship:

• TAGMAR AG (CHE-114.479.276), 0 audit engagements

Further connections:

• Della Santa Giorgio (CHE-108.650.248), 0 audit engagements