| STStandard Tool and Machine Company, dba Piedmont Manufacturing Division | Piedmont | SC | 1–19 | ◐ LIKELY ACTIVE |
| SWStandard Welding & Steel Products Inc | Medina | OH | 20–99 | ◐ LIKELY ACTIVE |
Standex International Corporation | North Billerica | MA | — | ▲ REPORTED CLOSED |
| STStandfast Tram LLC | Chicago | IL | — | ◐ LIKELY ACTIVE |
| SAStanley Access Technologies MTC | Greenfield | IN | 100–499 | ◐ LIKELY ACTIVE |
| SBStanley Black and Decker | Gallatin | TN | 100–499 | ◐ LIKELY ACTIVE |
| SBStanley Black & Decker, INC. | New Britain | CT | — | ◐ LIKELY ACTIVE |
| SWStanley Wiesen, INC. | Hartford | CT | — | ◐ LIKELY ACTIVE |
| SStar | River Grove | IL | 20–99 | ◐ LIKELY ACTIVE |
| SFStar Fab, LLC (Columbiana) | Columbiana | OH | 1–19 | ◐ LIKELY ACTIVE |
| SPStar Pipe Products LTD | Houston Texas | TX | 100–499 | ◐ LIKELY ACTIVE |
| SMStarr Manufacturing, Inc. | Vienna | OH | 20–99 | ◐ LIKELY ACTIVE |
| SSStar Step Trinkote Coatings LLC | Cresson | TX | 20–99 | ◐ LIKELY ACTIVE |
| SWStar Welding & Fabrication, LLC | Pearland | TX | 1–19 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering System - Lancaster PA | Lancaster | PA | 1–19 | ◐ LIKELY ACTIVE |
| SEStatco-DSI ENgineering Systems- Gallatin-TN | Gallatin | TN | 1–19 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering Systems- Huntington Beach -CA | Huntington Beach | CA | 20–99 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering Systems - Plano TX | Plano | TX | 1–19 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering Systems - St. Louis | Saint Louis | MO | 20–99 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering Systems - Stockton CA | Argonaut | CA | 20–99 | ◐ LIKELY ACTIVE |
| SEStatco-DSI Engineering Sytems - Woodland WA | Woodland | WA | 20–99 | ◐ LIKELY ACTIVE |
| SIStaticworx, INC. | Williston | VT | — | ◐ LIKELY ACTIVE |
| SSStaton Sales LLC | Salem | OH | — | ◐ LIKELY ACTIVE |
| SASteel and Stuff Customs, LLC | Jacksonville | AR | — | ◐ LIKELY ACTIVE |
| SSteelcraft | Cincinnati | OH | 500+ | ◐ LIKELY ACTIVE |
| SSteelcraft-Chino | Chino | CA | 20–99 | ◐ LIKELY ACTIVE |
| SDSteel Dynamics Flat Roll Group - MetalTech | Pittsburgh | PA | 20–99 | ◐ LIKELY ACTIVE |
| SDSteel Dynamics Flat Roll Group - NexTech | Turtle Creek | PA | 20–99 | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Engineered Bar Products | Pittsboro | IN | 500+ | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Flat Roll Group - Butler | Butler | IN | 500+ | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Flat Roll Group - Columbus | Columbus | MS | 500+ | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Flat Roll Group - Jeffersonville | Jeffersonville | IN | 100–499 | ◐ LIKELY ACTIVE |
| SDSteel Dynamics, Inc. - Flat Roll Group - Sinton | Sinton | TX | 500+ | ◐ LIKELY ACTIVE |
| SDSteel Dynamics Roanoke Bar Division | Roanoke | VA | 100–499 | ◐ LIKELY ACTIVE |
| SASteele AL | Steele | AL | 20–99 | ◐ LIKELY ACTIVE |
SteelFab, Inc. Chandler, AZ | Chandler | AZ | 100–499 | ◐ LIKELY ACTIVE |
SteelFab Inc Florence | Florence | SC | 100–499 | ◐ LIKELY ACTIVE |
| SFSteel fabrication | Kuna | ID | 20–99 | ◐ LIKELY ACTIVE |
| SFSteel Fabrication | Fort Worth | TX | 100–499 | ◐ LIKELY ACTIVE |
| SGSteel Girder LLC | Dickinson | ND | — | ◐ LIKELY ACTIVE |
| SGSteel Goode Products- DBA Aalberts- Cadiz | Cadiz | OH | 1–19 | ◐ LIKELY ACTIVE |
| SGSteel Goode Products- DBA Aalberts- Houston | Houston | TX | 20–99 | ◐ LIKELY ACTIVE |
| SGSteel Goode Products- DBA Aalberts- Odessa | Odessa | TX | 20–99 | ◐ LIKELY ACTIVE |
| SHSteel Haven Fabrication LLC | Smith | NV | — | ◐ LIKELY ACTIVE |
| SSteelHearn | Lincoln | NE | 20–99 | ◐ LIKELY ACTIVE |
| SWSteelial Welding & Metal Fabrication, INC | Vinton | OH | — | ◐ LIKELY ACTIVE |
| SISteel It, LLC | Cincinnati | OH | 20–99 | ◐ LIKELY ACTIVE |
| SKSteel King Industries, Inc. Corporate | Stevens Point | WI | 20–99 | ◐ LIKELY ACTIVE |
| SKSteel King Industries, Inc. NL | New London | WI | 100–499 | ◐ LIKELY ACTIVE |
| SKSteel King Industries, Inc. Rome | Rome | GA | 100–499 | ◐ LIKELY ACTIVE |