X0508 4 2026-02-23 0001022671 STEEL DYNAMICS INC STLD 0001921061 Anderson James Stanley 7575 W. JEFFERSON BLVD. FORT WAYNE IN 46804 0 1 0 0 Senior Vice President 0 Common Stock 2026-02-23 4 F 0 657 193.39 D 106278 D Common Stock 2026-02-23 4 F 0 658 193.39 D 105620 D Common Stock 2026-02-24 4 F 0 1053 196.01 D 104567 D Represents disposition to issuer to cover taxes payable upon vesting of previously issued and reported restricted stock units, exempt pursuant to Rule 16b-3. /s/ James Stanley Anderson 2026-02-25