EX-21.1 3 stld-20231231xex21d1.htm EX-21.1

EXHIBIT 21.1

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STEEL DYNAMICS, INC.

LIST OF OUR SUBSIDIARIES

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| ​ |  | ​ |  | ​ | ​
Name |  | State of Incorporation or Organization |  | Percent of Capital Stock/Equity Units Owned by Steel Dynamics, Inc. |  | Names Under which Business is Conducted
​ | ​ | ​ | ​ | ​ | ​ | ​
Aluminum Dynamics, LLC | ​ | Indiana | ​ | 94.4% | ​ | ​
Mesabi Nugget Delaware, LLC | ​ | Delaware | ​ | 86% | ​ | ​
New Millennium Building Systems, LLC | ​ | Indiana | ​ | 100% | ​ | ​
OmniSource, LLC | ​ | Indiana | ​ | 100% | ​ | OmniSource
Roanoke Electric Steel Corporation | ​ | Indiana | ​ | 100% | ​ | Steel Dynamics Roanoke Bar Division
SDI Biocarbon Solutions, LLC | ​ | Delaware | ​ | 75% | ​ | ​
Steel Dynamics Columbus, LLC | ​ | Delaware | ​ | 100% | ​ | ​
Steel Dynamics Enterprises, Inc. | ​ | Indiana | ​ | 100% | ​ | ​
Steel Dynamics Heartland, LLC | ​ | Delaware | ​ | 100% | ​ | ​
Steel Dynamics Sales North America, Inc. | ​ | Indiana | ​ | 100% | ​ | ​
Steel Dynamics Southwest, LLC | ​ | Indiana | ​ | 100% | ​ | ​
Steel of West Virginia, Inc. | ​ | Delaware | ​ | 100% | ​ | ​
STLD Holdings, Inc. | ​ | Indiana | ​ | 100% | ​ | ​
The Techs Industries, Inc. | ​ | Delaware | ​ | 100% | ​ | The Techs The Techs a Division of Steel Dynamics, Inc.
United Steel Supply, LLC | ​ | Delaware | ​ | 90% | ​ | ​
Vulcan Threaded Products, Inc. | ​ | Indiana | ​ | 100% | ​ | Vulcan Steel Products CLP Systems

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