Exhibit 21.1
| | | Percent of Capital Stock/Equity Units Owned/Voted by Steel Dynamics, Inc. | | Percent of Capital Stock/Equity Units Owned/Voted by Steel Dynamics Subsidiary | | Percent of Capital Stock/Equity Units Owned/Voted by OmniSource Corporation | | Percent of Capital Stock/Equity Units Owned/Voted by OmniSource Subsidiary | |
| Dynamic Aviation, LLC | | 100 | % | — | | — | | — | |
* | New Millennium Building Systems, LLC | | 100 | % | — | | — | | — | |
* | OmniSource Corporation | | 100 | % | — | | — | | — | |
* | OmniSource Transport, LLC | | — | | — | | 100 | % | — | |
* | OmniSource Indianapolis, LLC | | — | | — | | 100 | % | — | |
* | Capitol City Metals, LLC(1) | | — | | — | | — | | 100 | % |
| Cumberland Recycling Group, LLC(1) | | — | | — | | — | | 50 | % |
* | OmniSource Athens Division, LLC | | — | | — | | 100 | % | — | |
* | Michigan Properties Ecorse, LLC | | — | | — | | 100 | % | — | |
* | Recovery Technologies, LLC | | — | | — | | 100 | % | — | |
* | Lucky Strike Metals, LLC | | — | | — | | 100 | % | — | |
| Speedbird Aviation, LLC | | — | | — | | 100 | % | — | |
* | Auburn Investment Company, LLC | | — | | — | | 100 | % | — | |
* | Scientific Recycling Group, LLC | | — | | — | | 100 | % | — | |
* | Superior Aluminum Alloys, LLC | | — | | — | | 100 | % | — | |
* | OmniSource, LLC | | — | | — | | 100 | % | — | |
* | OmniSource Mexico, LLC | | — | | — | | 100 | % | — | |
| OmniSource Mexico S.de R.I. de C.V.(2) | | — | | — | | — | | 100 | % |
* | Global Shredding Technologies, Ltd., LLC | | — | | — | | 100 | % | — | |
* | Industrial Scrap, LLC | | — | | — | | 100 | % | — | |
* | Industrial Scrap Corporation | | — | | — | | 100 | % | — | |
| Industrial Scrap Consulting, LLC | | — | | — | | 50 | % | — | |
| OmniSource/Mervis LLC | | — | | — | | 50 | % | — | |
* | Admetco, Inc. | | — | | — | | 100 | % | — | |
* | Jackson Iron & Metal Company, Inc. | | — | | — | | 100 | % | — | |
* | OmniSource Bay City, LLC(3) | | — | | — | | — | | 100 | % |
* | OmniSource Southeast, LLC | | — | | — | | 100 | % | — | |
* | Atlantic Scrap & Processing – Wilmington, LLC(4) | | — | | — | | — | | 100 | % |
* | Carolinas Recycling Group, LLC(4) | | — | | — | | — | | 100 | % |
* | Cohen & Green Salvage Co., Inc. (4) | | — | | — | | — | | 100 | % |
* | Lumberton Recycling Company, Inc. (4) | | — | | — | | — | | 100 | % |
* | Raeford Salvage Company, Inc. (4) | | — | | — | | — | | 100 | % |
| Second Pass, LLC(4) | | — | | — | | — | | 50 | % |
| SDI Sub, LLC | | — | | — | | 100 | % | — | |
| Paragon Steel Enterprises, LLC | | 50 | % | — | | — | | — | |
* | Roanoke Electric Steel Corporation | | 100 | % | — | | — | | — | |
* | New Millennium Building Systems, Inc. | | — | | 100 | % | — | | — | |
* | SOCAR of Ohio, Inc. (5) | | — | | 100 | % | — | | — | |
| | | Percent of Capital Stock/Equity Units Owned/Voted by Steel Dynamics,Inc. | | Percent of Capital Stock/Equity Units Owned/Voted by Steel Dynamics Subsidiary | | Percent of Capital Stock/Equity Units Owned/Voted by OmniSource Corporation | | Percent of Capital Stock/Equity Units Owned/Voted by OmniSource Subsidiary | |
* | John W. Hancock, Jr. LLC | | — | | 100 | % | — | | — | |
* | Steel of West Virginia, Inc. | | — | | 100 | % | — | | — | |
* | Marshall Steel, Inc. (6) | | — | | 100 | % | — | | — | |
* | SWVA, Inc. (6) | | — | | 100 | % | — | | — | |
* | Steel Ventures, Inc. (6) | | — | | 100 | % | — | | — | |
* | SDI Investment Company | | 100 | % | — | | — | | — | |
* | Shredded Products II, LLC | | 100 | % | — | | — | | — | |
* | Steel Dynamics Sales North America, Inc. | | 100 | % | — | | — | | — | |
| STLD Holdings, Inc. | | 100 | % | — | | — | | — | |
| Ferrous Resources, LLC | | — | | 100 | % | — | | — | |
| Mesabi Nugget Delaware, LLC(7) | | — | | 81 | % | — | | — | |
| Dynamics Composites, LLC | | — | | 84 | % | — | | — | |
| Indiana Nugget, LLC | | — | | 100 | % | — | | — | |
| Mesabi Mining, LLC | | — | | 100 | % | — | | — | |
| Resource Ventures, LLC | | — | | 90 | % | — | | — | |
| Resource Ventures II, LLC | | — | | 64 | % | — | | — | |
| OmniSource Holdings, LLC | | — | | 100 | % | — | | — | |
| Dynamic Holdings, LLC | | — | | 100 | % | — | | — | |
| OmniSource Scrap Metals Management of Mexico, S.de R.L. de C.V.(8) | | — | | 100 | % | — | | — | |
* | The Techs Industries, Inc. | | 100 | % | — | | — | | — | |
* Subsidiary Guarantors
(1) Owned by OmniSource Indianapolis, LLC, a subsidiary of OmniSource Corporation
(2) Owned by OmniSource Mexico, LLC, a subsidiary of OmniSource Corporation and OmniSource, LLC, a subsidiary of OmniSource Corporation
(3) Owned by Jackson Iron & Metal Company, Inc., a subsidiary of OmniSource Corporation
(4) Owned by OmniSource Southeast, LLC, a subsidiary of OmniSource Corporation
(5) Owned by New Millennium Building Systems, Inc., a subsidiary of Roanoke Electric Steel Corporation
(6) Owned by Steel of West Virginia, Inc., a subsidiary of Roanoke Electric Steel Corporation
(7) Owned by Ferrous Resources, LLC a subsidiary of STLD Holdings, Inc.
(8) Owned (99%) by OmniSource Holdings, LLC, a subsidiary of STLD Holdings, Inc. and (1%) by Dynamic Holdings, LLC, a subsidiary of STLD Holdings, Inc.