Exhibit 99.1 Ryerson Reports First Quarter 2024 Results Quarterly business highlights include start-up of operations at University Park, IL service center, completion of ERP integration of 17 service centers, and continued investment in organic growth initiatives, including the expansion and modernization of the Shelbyville, KY service center CHICAGO – April 30, 2024 – Ryerson Holding Corporation (NYSE: RYI), a leading value-added processor and distributor of industrial metals, today reported results for th ...