Exhibit 99.1 Amarin Reports First Quarter 2024 Business Update and Financial Results -- New VAZKEPA® Patent Issued by European Patent Office Extends Intellectual Property Protection in Europe Until 2039 -- -- In Europe, ~35% Revenue Growth, ~65% In-Market Sales Growth Q1 '24 versus Q4 '23 Driven by Spain and the UK -- -- Current Cash Position of $308 Million; Remains Stable Over Seven Quarters -- -- Share Repurchase Program of up to$50 Million Approved by Shareholders; Repurchases Expected to Commence Foll ...