Exhibit 99.1 Assertio Reports First Quarter 2024 Financial Results First Quarter Net Product Sales of $31.9 Million Rolvedon Growth Continues, with $14.5 million in Net Product Sales $7.5 Million in Cash Flow from Operations Increases Cash to $80.7 Million LAKE FOREST, IL. – May 6, 2024 – Assertio Holdings, Inc. ("Assertio" or the "Company") (Nasdaq: ASRT), a pharmaceutical company with comprehensive commercial capabilities offering differentiated products to patients, today reported financial results for t ...