^Allschwil, Switzerland - May 31, 2024 Idorsia Ltd (SIX: IDIA) today announced that data from the Phase 3 study of aprocitentan, Idorsia's endothelin receptor antagonist, will be presented by Prof. Krzysztof Narkiewicz, MD, PhD, at the European Society of Hypertension's 33(r)(d) European Meeting of Hypertension and Cardiovascular Protection, taking place in Berlin, Germany, May 31 - June 3, 2024. An oral presentation is scheduled for Sunday, June 2 (09:05 - 09:15 CEST) in Convention Hall I C, as part of the "Clinical Studies" session, entitled "Blood pressure control with aprocitentan in resistant hypertension". The presentation focuses on a pre-planned analysis evaluating the efficacy of aprocitentan on the percentage of patients with controlled blood pressure according to hypertension guidelines at different timepoints during the Phase 3 PRECISION study. The abstract can be found here (https://journals.lww.com/jhypertension/abstract/2024/05001/blood_pressure_contr ol_with_aprocitentan_in.24.aspx). A poster presentation is scheduled for Saturday, June 1 (18:50 - 18:55 CEST) as part of the session "Moderated E-poster session 7 - Clinical studies", entitled "Effect of high dose aprocitentan in patients with resistant hypertension not controlled by low dose". The presentation focuses on a post-hoc exploratory analysis evaluating the observed long-term benefit of increasing to a higher dose of aprocitentan (25 mg) in patients not achieving a blood pressure control after 4 weeks on the lower dose (12.5 mg). The abstract can be found here (https://journals.lww.com/jhypertension/abstract/2024/05001/effect_of_high_dose_ aprocitentan_in_patients_with.275.aspx). Notes to the editor About aprocitentan Aprocitentan is Idorsia's once-daily, orally active, dual endothelin receptor antagonist, which inhibits the binding of ET-1 to ET(A) and ET(B) receptors. In May 2022, Idorsia announced positive top-line results of the Phase 3 PRECISION study with aprocitentan for the treatment of patients with resistant hypertension. Detailed results were published in The Lancet and presented as a Late-Breaking Science presentation during the American Heart Association (AHA) Scientific Sessions in November 2022. More details and commentary can be found in the dedicated press release (https://www.idorsia.com/investors/news-and- events/media-release-details?newsId=2869821) and an investor webcast (https://www.idorsia.com/investors/news-and-events/Apro-session-AHA- 2022) featuring Prof. Markus Schlaich, an investigator in PRECISION. On March 19, 2024, aprocitentan was approved as TRYVIO in the US, with availability planned for H2 2024. On April 25, 2024, Idorsia received a positive opinion for aprocitentan (as JERAYGO(TM)) from the Committee for Medicinal Products for Human Use (CHMP) as a treatment of resistant hypertension. A CHMP positive opinion is one of the final steps before marketing authorization can be granted by the European Commission; a final decision is expected approximately two months after publication of the CHMP opinion. About Prof. Krzysztof Narkiewicz, MD, PhD Professor Krzysztof Narkiewicz is the Head of the Department of Hypertension and Diabetology, Medical University of Gdansk, Gdansk, Poland. His research has been focused on the role of the sympathetic nervous system and metabolic factors in regulation of cardiovascular function in physiological and pathological states, and on prevention and treatment of cardiometabolic diseases including hypertension, diabetes, coronary artery disease, congestive heart failure and obstructive sleep apnea. He has published over 700 full-text publication; (> 39 000 citations; h-index: 69). He was the President of the Scientific Council of the European Society of Hypertension (2009-2011). He was a member of the Task Force for the Management of Arterial Hypertension of the European Society of Hypertension (ESH) and of the European Society of Cardiology (ESC) preparing the 2007, 2013 and 2018 Guidelines for the Management of Arterial Hypertension. He also contributed to the 2023 ESH hypertension guidelines. Prof. Krzysztof Narkiewicz serves as a consultant to Idorsia. About Idorsia Idorsia Ltd is reaching out for more - We have more ideas, we see more opportunities and we want to help more patients. In order to achieve this, we will develop Idorsia into a leading biopharmaceutical company, with a strong scientific core. Headquartered near Basel, Switzerland - a European biotech-hub - Idorsia is specialized in the discovery, development and commercialization of small molecules to transform the horizon of therapeutic options. Idorsia has a 25-year heritage of drug discovery, a broad portfolio of innovative drugs in the pipeline, an experienced team of professionals covering all disciplines from bench to bedside, and commercial operations in Europe and North America - the ideal constellation for bringing innovative medicines to patients. Idorsia was listed on the SIX Swiss Exchange (ticker symbol: IDIA) in June 2017 and has over 750 highly qualified specialists dedicated to realizing our ambitious targets. For further information, please contact Andrew C. Weiss Senior Vice President, Head of Investor Relations & Corporate Communications Idorsia Pharmaceuticals Ltd, Hegenheimermattweg 91, CH-4123 Allschwil +41 58 844 10 10 investor.relations@idorsia.com media.relations@idorsia.com www.idorsia.com (http://www.idorsia.com) The above information contains certain "forward-looking statements", relating to the company's business, which can be identified by the use of forward-looking terminology such as "estimates", "believes", "expects", "may", "are expected to", "will", "will continue", "should", "would be", "seeks", "pending" or "anticipates" or similar expressions, or by discussions of strategy, plans or intentions. Such statements include descriptions of the company's investment and research and development programs and anticipated expenditures in connection therewith, descriptions of new products expected to be introduced by the company and anticipated customer demand for such products and products in the company's existing portfolio. Such statements reflect the current views of the company with respect to future events and are subject to certain risks, uncertainties and assumptions. Many factors could cause the actual results, performance or achievements of the company to be materially different from any future results, performances or achievements that may be expressed or implied by such forward- looking statements. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those described herein as anticipated, believed, estimated or expected. °

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