13. Trading blackout periods

BB Biotech AG has defined recurring trading blackout periods, during which BB Biotech AG, the members of its Board of Directors, employees of Bellevue Asset Management AG to whom BB Biotech AG has delegated the investment management as well as related parties are prohibited from trading in securities of BB Biotech AG and/or related financial instruments, subject to exemptions provided by Swiss law (e.g., for share buyback programs). The recurring trading blackout periods begin at least 30 days before the publication of the annual or interim financial statements and end on the day of their publication. The exact dates are communicated by Bellevue Asset Management AG’s Legal & Compliance team on behalf of BB Biotech AG to all persons involved. BB Biotech AG may impose additional (ad hoc) trading blackout periods at any time for any reason.