X0303 4 2010-11-11 0001022671 STEEL DYNAMICS INC STLD 0001195948 BUSSE KEITH E 7575 W. JEFFERSON BLVD. FORT WAYNE IN 46804 1 1 0 0 Chairman and CEO Common Stock 2010-11-11 4 S 0 25000 16.04 D 164900 I See footnote Common Stock 2010-11-11 4 S 0 25000 16.08 D 139900 I See footnote Common Stock 2010-11-11 4 S 0 30000 16.19 D 109900 I See footnote Common Stock 2010-11-15 4 S 0 9400 16.04 D 100500 I See footnote Common Stock 2010-11-15 4 S 0 8174 16.05 D 92326 I See footnote Common Stock 1077957 D Reflects sale of shares by the Busse Family Investment Company, LLC, with respect to which Reporting Person holds neither sole nor shared voting or investment power. Such authority is lodged exclusively in a board of managers, which does not include the Reporting Person, and Reporting Person disclaims all beneficial interest in any of such shares. Keith E. Busse 2010-11-16