Certain Restricted Stock Units of ADC Therapeutics SA are subject to a Lock-Up Agreement Ending on 3-FEB-2024. These Restricted Stock Units will be under lockup for 366 days starting from 2-FEB-2023 to 3-FEB-2024.

Details:
Directors and officers and certain shareholders, the selling shareholder, Oaktree Fund Administration, LLC and certain affiliates of Oaktree Fund Administration, LLC (the Oaktree Fund Administration, LLC, together with the certain affiliates of Oaktree Fund Administration, LLC, ?Oaktree?) each have agreed that, without the prior written consent of the underwriter, they will not, during the period ending either 60 days (in the case of directors and officers) or 365 days (in the case of the selling shareholder and Oaktree) after the date of this prospectus supplement