Exhibit 99.1 Sotera Health Reports Third-Quarter and Year-to-Date 2024 Results • Q3 2024 net revenues of $285 million increased 8.5%, compared to Q3 2023 • Q3 2024 net income of $17 million or $0.06 per diluted share, compared to net loss of $14 million or $0.05 per diluted share in Q3 2023 • Q3 2024 Adjusted EBITDA of $146 million increased 9.0%, compared to Q3 2023 • Q3 2024 Adjusted EPS of $0.17 increased $0.01 per diluted share, compared to Q3 2023 • Reaffirming 2024 Net Revenue and Adjusted EBITDA outl ...