Report on the Review of condensed consolidated interim financial statements

Introduction

We have reviewed the condensed consolidated interim financial statements (consolidated balance sheet, consolidated statement of comprehensive income, consolidated statement of changes in equity, consolidated statement of cash flow and selected explanatory notes) of BB Biotech AG for the period ended 31 March 2021. The Board of Directors is responsible for the preparation and presentation of these condensed consolidated interim financial statements in accordance with International Accounting Standard 34 «Interim Financial Reporting» and article 14 of the Directive on Financial Reporting (DFR) of the SIX Swiss Exchange. Our responsibility is to express a conclusion on these condensed consolidated interim financial statements based on our review.

Scope of Review

We conducted our review in accordance with Swiss Auditing Standard 910 and International Standard on Review Engagements 2410, «Review of interim financial information performed by the independent auditor of the entity». A review of interim financial information consists of making inquiries, primarily of persons responsible for financial and accounting matters, and applying analytical and other review procedures. A review is substantially less in scope than an audit conducted in accordance with Swiss Auditing Standards and International Standards on Auditing and consequently does not enable us to obtain assurance that we would become aware of all significant matters that might be identified in an audit. Accordingly, we do not express an audit opinion.

Conclusion

Based on our review, nothing has come to our attention that causes us to believe that the condensed consolidated interim financial statements have not been prepared, in all material respects, in accordance with International Accounting Standard 34 «Interim Financial Reporting» and article 14 of the Directive on Financial Reporting (DFR) of the SIX Swiss Exchange.

PricewaterhouseCoopers AG

Zurich, 21 April 2021

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