HORIZON THERAPEUTICS INVESTOR ALERT BY THE FORMER ATTORNEY GENERAL OF LOUISIANA: Kahn Swick & Foti, LLC I

Former Attorney General of Louisiana Charles C. Foti, Jr., Esq. and the law firm of Kahn Swick & Foti, LLC ("KSF") are investigating the proposed sale of Horizon Therapeutics Public Limited Company HZNP to Amgen Inc. AMGN. Under the terms of the proposed transaction, shareholders of Horizon will receive only $116.50 in cash for each share of Horizon that they own. KSF is seeking to determine whether this consideration and the process that led to it are adequate, or whether the consideration undervalues the Company.

If you believe that this transaction undervalues the Company and/or if you would like to discuss your legal rights regarding the proposed sale, you may, without obligation or cost to you, e-mail or call KSF Managing Partner Lewis S. Kahn (lewis.kahn@ksfcounsel.com) toll free at any time at 855-768-1857, or visit https://www.ksfcounsel.com/cases/nasdaqgs-hznp/ to learn more.