Exhibit 99.1 Assertio Reports Second Quarter 2025 Financial Results Second Quarter Total Net Product Sales of $28.8 Million, Cash and Investments Increase to$98.2 Million Narrows Guidance on Continued Progress Implementing Long-Term Business Strategy LAKE FOREST, IL. – August 11, 2025 – Assertio Holdings, Inc. ("Assertio" or the "Company") (Nasdaq: ASRT), a pharmaceutical company with comprehensive commercial capabilities offering differentiated products designed to address patients' needs, today reported ...