X0407 4 2023-04-06 0001022671 STEEL DYNAMICS INC STLD 0001195949 MILLETT MARK D 7575 W. JEFFERSON BLVD. FORT WAYNE IN 46804 0 1 0 0 Chairman and CEO 0 Common Stock 2902911 D Common Stock 2023-04-06 4 G 0 109800 0 D 0 I By grantor retained annuity trust On March 24, 2020, the reporting person contributed 150,000 shares of Steel Dynamics, Inc. common stock to a grantor retained annuity trust (GRAT), of which he is the sole trustee and annuitant, constituting a mere change in the form of beneficial ownership, exempt from both the reporting requirements of Section 16(a) and the short-swing profit recovery provisions of Section 16(b) by reason of Rule 16a-13. Previously, 40,200 shares of Steel Dynamics, Inc. common stock were distributed to reporting person in satisfaction of the GRAT's annuity obligations, and previously reported on separate Form 4s, constituting a mere change of beneficiary ownership, exempt from both the reporting requirements and short-swing profits provision pursuant to SEC Rule 16a-13. Upon termination of the trust, 109,800 shares were transferred on April 6, 2023 to the reporting person's children, as beneficiaries under the trust. Mark D. Millett 2023-04-06