Exhibit 99.1 MRC Global Announces Third Quarter 2025 Results Houston, TX – November 5, 2025 – MRC Global Inc. (NYSE: MRC) today announced third quarter 2025 results from continuing operations. Third Quarter 2025 Financial Highlights: Rob Saltiel, MRC Global's President and CEO, commented, "The implementation of our new enterprise resource planning (ERP) system in our U.S. segment encountered significant challenges that adversely impacted our revenues, profitability, and cash flows, during the third quarter. ...