STLD: Leadership change · Company disclosure

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On August 3, 2026, Mark D. Millett, Steel Dynamics, Inc.’s (the “Company”) Chairman and Chief Executive Officer gave notice to the Company’s Board of Directors (the “Board”) of his intention to retire as Chief Executive Officer of the Company effective January 1, 2027. The Board has appointed Mr. Millett as the Company’s Executive Chairman concurrently with his retirement as Chief Executive Officer. The Board made the following additional appointments effective January 1, 2027: (i) Theresa E. Wagler, the Company’s Executive Vice President and Chief Financial Officer, will become the Company’s President and Chief Executive Officer and (ii) Richard A. Poinsatte, the Company’s Executive Vice President and Treasurer, will become the Company’s Executive Vice President and Chief Financial Officer. Effective immediately, the Board appointed Ms. Wagler as a member of the Board and increased the size of the Board from seven to eight members. The Board made the following appointments effective September 1, 2026: (i) Barry Schneider, the Company’s President and Chief Operating Officer, will become the Company’s Executive Vice President and Chief Technology Officer, (ii) Miguel Alvarez, the Company’s Senior Vice President Aluminum Group, will become the Company’s Executive Vice President and Chief Operating Officer Aluminum Flat Rolled Products and Metals Recycling Operations, (iii) James Anderson, the Company’s Senior Vice President Long Products Steel Group, will become the Company’s Executive Vice President and Chief Operating Officer Construction Products Operations, and (iv) Christopher Graham, the Company’s Senior Vice P