X0508 4 2024-06-03 0001022671 STEEL DYNAMICS INC STLD 0001482379 Cornew Kenneth W. 10 SOUTH DEARBORN STREET 54TH FLOOR CHICAGO IL 60603 1 0 0 0 0 Common Stock 2024-06-03 4 A 0 1233 0 A 34752 D Issued as deferred stock units (DSUs) in connection with reporting person's retainer as a director under the Company's 2023 Equity Incentive Plan and exempt from Section 16(b) by virtue of Rule 16b-3(d)(1) and (3). These DSUs are reportable, however, as directly owned shares of common stock, rather than as a derivative security in Table II, because any and all underlying DSUs are payable, at such time as they are to be settled, solely in common stock. See Lincoln National Corp. (March 20, 1992) (Q.3). /s/ Theresa E. Wagler by Power of Attorney 2024-06-03