UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. 1)
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Steel Dynamics, Inc.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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See the reverse side of this notice to obtain proxy materials and voting instructions. *** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. Meeting Information Meeting Type: For holders as of: Date: Time: Location: 0000237032_1 R1.0.0.51160 STEEL DYNAMICS, INC. 7575 WEST JEFFERSON BLVD. FORT WAYNE, IN 46804 Annual Meeting March 23, 2015 May 21, 2015 May 21, 2015 9:00 AM EDT Calhoun Ballroom 120 West Jefferson Boulevard Fort Wayne, Indiana

Please Choose One of the Following Voting Methods Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. How To Vote . Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line. 0000237032_2 R1.0.0.51160 1. Notice & Proxy Statement 2. Form 10-K 3. Annual Report Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 07, 2015 to facilitate timely delivery.

Voting items 0000237032_3 R1.0.0.51160 The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees 01 Mark D. Millett 02 Richard P. Teets, Jr. 03 John C. Bates 04 Keith E. Busse 05 Frank D. Byrne, M.D. 06 Traci M. Dolan 07 Paul B. Edgerley 08 Dr. Jürgen Kolb 09 James C. Marcuccilli 10 Bradley S. Seaman 11 Gabriel L. Shaheen The Board of Directors recommends you vote FOR proposals 2, 3 and 4. 2 TO APPROVE THE APPOINTMENT OF ERNST & YOUNG LLP AS STEEL DYNAMICS INC.'S INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM FOR THE YEAR 2015. 3 TO APPROVE THE STEEL DYNAMICS, INC. 2015 EQUITY INCENTIVE PLAN. 4 TO APPROVE, BY AN ADVISORY VOTE, NAMED EXECUTIVE OFFICER COMPENSATION. NOTE: Unless otherwise directed, this proxy will be voted "FOR" the nominees listed in Proposal 1, and "For" Proposals 2, 3 and 4.

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