Exhibit 99.1 HALOZYME REPORTS THIRD QUARTER 2024 FINANCIAL AND OPERATING RESULTS Total Revenue Increased 34% YOY to $290 million and Royalty Revenue Increased 36% YOY to $155 million Net Income Increased 67% YOY to $137 million and Adjusted EBITDA Increased 60% YOY to $184 million GAAP Diluted EPS Increased 72% YOY to $1.05 and Non-GAAP Diluted EPS Increased 69% YOY to $1.27 Raised 2024 Financial Guidance Ranges for Total Revenue of $970-$1,020 million, Representing YOY Growth of 17%-23%, Adjusted EBITDA of ...