STEEL DYNAMICS INC — Director's Dealing 2015

May 20, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: STEEL DYNAMICS INC (STLD)
CIK: 0001022671
Period of Report: 2015-05-18

Reporting Person: Wagler Theresa E (Executive Vice President & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-05-18	Common Stock	M	4422	$13.57	Acquired	215434	Direct
2015-05-18	Common Stock	F	2765	$21.69	Disposed	212669	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-05-18	Employee Stock Option	$13.57	M	4422	Disposed	2015-05-21	Common Stock (4422)	Direct

Footnotes

F1: Acquisition of stock pursuant to exercise of employee stock option, exempt under Exchange Act Rule 16b-6(b) and Rule 16b-3(d)(1).

F2: Exercise of stock option exempt pursuant to Rule 16b-6(b).

F3: Disposition to Issuer: Shares withheld by Issuer in payment of reporting person's exercise price under stock option in accordance with Exchange Act Rule 16b-3(d)(1) approved in advance by Compensation Committee and exempt from Section 16(b) of Exchange Act in accordance with Exchange Act Rule 16b-3(e).