Form 4 Filing for Sierra Luis Manuel

This filing details a transaction by Sierra Luis Manuel, a director at STEEL DYNAMICS INC. On October 9, 2026, Mr. Manuel acquired 7 shares of common stock under the company's 2023 Equity Incentive Plan. This acquisition, valued at a nominal price per share, represents an increase in his holdings. The shares are described as underlying additional deferred stock units (DSUs) issued as a dividend equivalent. This transaction is exempt from certain reporting and short-swing profit provisions due to its nature as a dividend reinvestment and specific plan exemptions. Mr. Manuel