STEEL DYNAMICS INC — Director's Dealing 2010

May 25, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: STEEL DYNAMICS INC (STLD)
CIK: 0001022671
Period of Report: 2010-05-21

Reporting Person: MILLETT MARK D (Director, Executive Vice President)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-21	Employee Stock Option (right to buy)	$13.57	A	4422	Acquired	2015-05-21	Common Stock (4422)	Direct

Footnotes

F1: Formula stock option grant, but provided by order of the Compensation Committee and Board, for purposes of this grant date, at 75% of the otherwise applicable dollar amount per grantee, pursuant to the 2006 Equity Incentive Plan and exempt from Section 16(b) pursuant to Rule 16b-3.