ObsEva Announces Update Towards its Strategic Reorganization to Consolidate Operations in Switzerland

Ad hoc announcement pursuant to Art. 53 LR of the SIX Swiss Exchange

GENEVA, Switzerland – March 13, 2023 – ObsEva SA (NASDAQ: OBSV; SIX: OBSN), a biopharmaceutical company developing and commercializing novel therapies for women’s health, today announced that Ernest Loumaye, MD, PhD, co-founder and member of the Board of Directors has been appointed as Interim Chairman following the resignation of Annette Clancy. It is expected that Dr. Loumaye will serve in this position until the 2023 Annual General Meeting of Shareholders, at which time he will be nominated for this position for the upcoming year.