Press Release October 20, 2025 Exhibit 99.1 7575 W. Jefferson Blvd. Fort Wayne, IN 46804 Steel Dynamics Reports Third Quarter 2025 Results FORT WAYNE, INDIANA, October 20, 2025 / PRNewswire / Third Quarter 2025 Performance Highlights: Steel Dynamics, Inc. (NASDAQ/GS: STLD) today announced third quarter 2025 financial results. The company reported third quarter 2025 net sales of $4.8 billion and net income of$404 million, or $2.74 per diluted share. Comparatively, the company's sequential second quarter 202 ...