Exhibit 99.1 Indivior Reports Third Quarter 2025 Financial Results and Raises Full-Year 2025 Financial Guidance • Q3'25 Total Net Revenue of $314m, up 2$219m, up 15% YOY • Conference Call Scheduled for Today at 8:00 A.M. Eastern Richmond, VA, October 30, 2025 – Indivior PLC (Nasdaq: INDV) today reported its financial results for the third quarter ended September 30, 2025, and provided a business update. "In the third quarter, we executed on Phase I of the Indivior Acti ...