Anerkennung von Prüfungsstandards

I Background

1 The Federal Audit Oversight Authority (FAOA) determines the standards of auditing

and quality management that must be complied with when audit services are provided to Public Interest Entities by audit firms under state oversight (Art. 16a in connection with Art. 2 lett. a no. 1 AOA)1. The FAOA has set out the applicable standards in OO-

2 This circular specifies the applicable standards in accordance with Art. 2 ff. OO-FAOA.

II Swiss standards on auditing and quality management (Art. 2 and 5 OO-

FAOA)

3 The following Swiss standards on auditing and quality management must be complied

with when annual and consolidated financial statements as well as special purpose engagements are audited:

Standard Name In force since Supplemented Repealed ISQM-CH 1 Quality management for firms that 15.12.2025 - - perform audits, reviews of financial statements, other assurance or related services engagements ISQM-CH 2 Engagement quality controls 15.12.2025 - - review ISA-CH 200 Overall objectives of the 15.12.2022 - - independent auditor and the principles of the conduct of an audit in accordance with Swiss auditing standards (SA-CH) ISA-CH 210 Agreeing the terms of audit 15.12.2022 - - engagements ISA-CH 220 Quality management for an audit 15.12.2024 - - of financial statements ISA-CH 230 Audit documentation 15.12.2022 - - ISA-CH 240 The auditor’s responsibilities 15.12.2022 - - relating to fraud in an audit of financial statements ISA-CH 250 Consideration of laws and 15.12.2022 - - regulations in an audit of financial statements ISA-CH 260 Communication with those 15.12.2022 FAOA Circular - charged with governance 1/2009 ISA-CH 265 Communicating deficiencies in 15.12.2022 - - internal control to those charged with governance and management ISA-CH 300 Planning an audit of financial 15.12.2022 - - statements ISA-CH 315 Identifying and assessing the risks 15.12.2024 - - of material misstatements

1 Auditor Oversight Act of 16 December 2005 (AOA; SR 221.302)

2 Ordinance of the Federal Audit Oversight Authority on the Oversight of Audit Firms of 17 March

2008 (OO-FAOA; SR 221.302.33)

Standard Name In force since Supplemented Repealed ISA-CH 320 Materiality in planning and 15.12.2022 - - performing an audit ISA-CH 330 The auditor’s responses to 15.12.2022 - - assessed risks ISA-CH 402 Audit considerations relating to an 15.12.2022 - - entity using a service organization ISA-CH 450 Evaluation of misstatements 15.12.2022 - - identified during the audit ISA-CH 500 Audit evidence 15.12.2022 - - ISA-CH 501 Audit evidence – specific 15.12.2022 - - considerations for selected items ISA-CH 505 External confirmations 15.12.2022 - -

ISA-CH 510 Initial audit engagements – 15.12.2022 - - opening balances ISA-CH 520 Analytical procedures 15.12.2022 - -

ISA-CH 530 Audit sampling 15.12.2022 - -

ISA-CH 540 Auditing accounting estimates, 15.12.2022 - - including fair value accounting estimates and related disclosures ISA-CH 550 Related parties 15.12.2022 - -

ISA-CH 560 Subsequent events 15.12.2022 - -

ISA-CH 570 Going concern 15.12.2022 - -

ISA-CH 580 Written representations 15.12.2022 - -

ISA-CH 600 Specific considerations – audits of 15.12.2024 - - group financial statements (Including the work of component auditors) ISA-CH 610 Using the work of internal auditors 15.12.2022 - -

ISA-CH 620 Using the work of an 15.12.2022 - - auditor’s expert ISA-CH 700 Forming an opinion and reporting 15.12.2022 - - on financial statements ISA-CH 701 Full audit: forming an opinion and 15.12.2022 FAOA Circular - reporting on financial statements 1/2015 ISA-CH 705 Modifications to the opinion in the 15.12.2022 - - independent auditor’s report ISA-CH 706 Emphasis of matter paragraphs 15.12.2022 - - and other matter paragraphs in the independent auditor’s report ISA-CH 710 Comparative information – 15.12.2022 - - corresponding figures and comparative financial statements ISA-CH 720 The auditor’s responsibilities 15.12.2022 - - relating to other information in documents containing audited financial statements AS-CH 290 Duties of the statutory auditor in 01.01.2023 - - cases of capital loss and overindebtedness

Standard Name In force since Supplemented Repealed AS-CH 700 Regular audit: Forming an opinion 15.12.2022 and reporting on financial statements AS-CH 890 Audit of the existence of the 15.12.2022 internal control system AS-CH 980 Compliance audit principles 01.01.2024 AS 800 Special Considerations ─ Audits of 15.12.2013 Financial Statements Prepared in Accordance with Special Purpose Frameworks AS 805 Special considerations – audits of 15.12.2013 - - single financial statements and specific elements, accounts, or items of a financial statement AS 880 Reports on public takeover offers 01.01.2017 - -

AS 950 Assurance engagements other 01.08.2020 than audits or reviews of historical financial information

III Foreign standards on auditing and quality management (Art. 3 and 5 OO-

FAOA)

4 The following auditing standards of the International Auditing and Assurance

Standards Board (IAASB) are recognised as standards on auditing in accordance with Art. 3 para. 1 OO-FAOA and as standards on quality management in accordance with Art. 5 para. 2 OO-FAOA:

ISQM/ISA Name In force since Supplemented Repealed

ISQM 1 Quality management for firms that perform 15.12.2022 - - audits or reviews of financial statements, or other assurance or related services engagements ISQM 2 Engagement quality reviews 15.12.2022 - - ISA 200 Overall objectives of the independent 15.12.2022 - - auditor and the conduct of an audit in accordance with international standards on auditing ISA 210 Agreeing the terms of audit 15.12.2009 - - engagements ISA 220 Quality management for an audit financial 15.12.2022 - - statement ISA 230 Audit documentation 15.12.2009 - - ISA 240 The auditor’s responsibility relating to fraud 15.12.2009 - - in an audit of financial statements ISA 250 Consideration of laws and regulations in an 15.12.2017 - - audit of financial statements ISA 260 Communication with those charged with 15.12.2024 - - governance ISA 265 Communicating deficiencies in 15.12.2009 - - internal control to those charge with governance and management

ISQM/ISA Name In force since Supplemented Repealed

ISA 300 Planning an audit of financial 15.12.2009 - - statements ISA 315 Identifying and assessing the risks of 15.12.2021 - - material misstatement

ISA 320 Materiality in planning and performing an 15.12.2009 - - audit ISA 330 The auditor’s response to assessed 15.12.2009 - -

ISA 402 Audit considerations relating to an entity 15.12.2009 - - using a service organization ISA 450 Evaluation of misstatements identified 15.12.2009 - - during the audit ISA 500 Audit evidence 15.12.2009 - - ISA 501 Audit evidence –specific considerations fpr 15.12.2009 - - selected items

ISA 505 External confirmations 15.12.2009 - - ISA 510 Initial audit engagements – opening 15.12.2009 - - balances ISA 520 Analytical procedures 15.12.2009 - - ISA 530 Audit sampling 15.12.2009 - -

ISA 540 Auditing accounting estimates and related 15.12.2019 - - disclosures ISA 550 Related parties 15.12.2009 - - ISA 560 Subsequent events 15.12.2009 - - ISA 570 Going concern 15.12.2016 - - ISA 580 Written representations 15.12.2009 - - ISA 600 Special considerations – audits of group 15.12.2023 - - financial statements (including the work of component auditors) ISA 610 Using the work of internal auditors 15.12.2014 - -

ISA 620 Using the work of an auditor’s expert 15.12.2009 - - ISA 700 Forming an opinion and reporting on 15.12.2024 - - financial statements ISA 701 Communicating key audit matters in the 15.12.2016 - - independent auditor’s report ISA 705 Modifications to the opinion in the 15.12.2016 - - independent auditor’s report ISA 706 Emphasis of matter paragraphs and other 15.12.2016 - - matter paragraphs in the independent auditor’s ISA 710 Comparative information – corresponding 15.12.2009 - - figures and comparative financial statements ISA 720 The auditor’s responsibilities relating to 15.12.2016 - - other information

4 bis. The auditing standards mentioned under margin no. 0 include also all the subsequent amendments enacted by the IAASB and entered into force (conforming amendments).

5 For the auditing of annual and consolidated financial statements that have been

prepared in accordance with the US Generally Accepted Accounting Principles (US GAAP), the US Generally Accepted Auditing Standards (US GAAS) of the American Institute of Certified Public Accountants (AICPA) and, if applicable, the auditing standards of the Public Company Accounting Oversight Board (PCAOB), in the version in force on the date the auditing activities are performed in each case, shall be recognised as being equivalent to the auditing standards recognised under margin no. 0. Audit firms that apply the auditing standards of the AICPA and, if applicable, of the PCAOB, when auditing annual and consolidated financial statements must ensure the quality of their audit services in accordance with both these standards and ISQM-

CH 1 and 2.

IIIbis. Transitional Arrangements on the Alteration made on 13 December 2024

5 bis. Repealed

5 ter. Repealed

IV Enactment

6 This circular shall come into force on 1 April 2008.3

7 The application of auditing standards that have already been adopted but are not yet

in force is permitted provided it is not expressly excluded by either the standard setter or the FAOA.

3 This circular was amended as follows:

• Amendment of 29 March 2010 (in force since 1 April 2010)

• Amendment of 26 November 2010 (in force since 1 January 2011)

• Amendment of 10 December 2013 (in force since 15 December 2013)

• Amendment of 10 November 2014 (in force since 1 January 2015)

• Amendment of 28 November 2016 (in force since 15 December 2016; AS 880 in the version dated 14 September 2016 enters into force on 1 January 2017)

• Amendment of 14 December 2017 (in force since 15 December 2017)

• Amendment of 26 June 2020 (in force since 1 August 2020)

• Amendment of 13 December 2022 (in force since 15 December 2022, unless the respective recognised standard defines 1 January 2023 as the date of entry into force)

• Amendment of 13 December 2023 (in force since 15 December 2023)

• Amendment of 13 December 2024 (in force as of 15 December 2024)

• Amendment of 19 September 2025 (in force as of 15 December 2025)