    <SEC-DOCUMENT>0001104659-24-040424-index.html : 20240328
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    <ACCEPTANCE-DATETIME>20240328142751
    ACCESSION NUMBER:		0001104659-24-040424
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20240328
    DATE AS OF CHANGE:		20240328

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			STEEL DYNAMICS INC
    		CENTRAL INDEX KEY:			0001022671
    		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
    		ORGANIZATION NAME:           	04 Manufacturing
    		IRS NUMBER:				351929476
    		STATE OF INCORPORATION:			IN
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-21719
    		FILM NUMBER:		24797695

    	BUSINESS ADDRESS:
    		STREET 1:		7575 W JEFFERSON BLVD
    		CITY:			FORT WAYNE
    		STATE:			IN
    		ZIP:			46804
    		BUSINESS PHONE:		260 459 3553

    	MAIL ADDRESS:
    		STREET 1:		7575 W JEFFERSON BLVD
    		CITY:			FORT WAYNE
    		STATE:			IN
    		ZIP:			46804
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>tm242683d3_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: tm242683d3_defa14a.htm

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    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm242683d3_defa14aimg01.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm242683d3_defa14aimg01.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm242683d3_defa14aimg02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm242683d3_defa14aimg02.jpg

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    </SEC-DOCUMENT>