www.smurfitwestrock.com Exhibit 99.1 Smurfit Westrock Reports Third Quarter 2024 Financial Results Dublin – October 30, 2024 – Smurfit Westrock plc (NYSE: SW, LSE: SWR) today announced the financial results for the third quarter ended September 30, 2024. Key points: · Net Sales of approx. $7.7 billion · Net Loss of$150 million, with a Net Income Margin of negative 2.0% · Adjusted EBITDA of $1,265 million, with an Adjusted EBITDA Margin of 16.5% · Continuing focus on asset optimization · Previously announce ...