| IGIntellisteel Group LLC | Groveland | FL | 1–19 | ◐ LIKELY ACTIVE |
| IPIrvin Plant | West Mifflin | PA | 500+ | ◐ LIKELY ACTIVE |
| JIJackson International Inc DBA Jaxon | Mineral Ridge | OH | 20–99 | ◐ LIKELY ACTIVE |
| JBJames Building A | Fort Wayne | IN | 20–99 | ◐ LIKELY ACTIVE |
| JSJb Stamping INC. | Associate Ave. | OH | 20–99 | ◐ LIKELY ACTIVE |
| JWJj Welding Desing LLC | Carolina | PR | — | ◐ LIKELY ACTIVE |
| JRJMS Russel Metals Corp - Blytheville | Blytheville | AR | 20–99 | ◐ LIKELY ACTIVE |
| JFJohnstown Facility | Johnstown | PA | 100–499 | ◐ LIKELY ACTIVE |
| KSKartal Services Group INC | Hubbard | OH | — | ◐ LIKELY ACTIVE |
| KWKeysteel Wire Corporation | New Carney | TX | 20–99 | ◐ LIKELY ACTIVE |
| KCKeystone Consolidated Industries, Inc., d/b/a Liberty Steel & Wire-Peoria | Peoria | IL | 500+ | ◐ LIKELY ACTIVE |
| KPKeystone Profiles LTD | Beaver Falls | PA | 20–99 | ◐ LIKELY ACTIVE |
| KKiswire | Pine Bluff | AR | 100–499 | ◐ LIKELY ACTIVE |
| KIKWM, Inc. dba Stainless Structurals Works | Conroe | TX | 20–99 | ◐ LIKELY ACTIVE |
| KSKyoei Steel America, LLC | Vinton | TX | 100–499 | ◐ LIKELY ACTIVE |
| LFLABECA - Ferguson | Fort Wayne | IN | 20–99 | ◐ LIKELY ACTIVE |
| LMLabeca - McArthur | Fort Wayne | IN | 20–99 | ◐ LIKELY ACTIVE |
| LFLabelleco fab | Beaumont | TX | 100–499 | ◐ LIKELY ACTIVE |
| LFLahti Fabrication Inc | Alger | MI | 20–99 | ◐ LIKELY ACTIVE |
| LHLapham - Hickey Steel | Fountain Inn | SC | 20–99 | ◐ LIKELY ACTIVE |
| LSLapham-Hickey Steel | Little Canada | MN | 20–99 | ◐ LIKELY ACTIVE |
| LSLapham-Hickey Steel Corp | Madison | IL | 20–99 | ◐ LIKELY ACTIVE |
| LOLatrobe Operations | Latrobe | PA | 100–499 | ◐ LIKELY ACTIVE |
| LFLaX Fabricating LTD - Spring Grove MN | Spring Grove | MN | 20–99 | ◐ LIKELY ACTIVE |
| LFLaX Fabricating LTD - Westby WI | Westby | WI | 20–99 | ◐ LIKELY ACTIVE |
| LALeggett and Platt Wire Mill | Cartahge | MO | 100–499 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Brandenburg Mill Service | Brandenburg | KY | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Butler Mill Service | Butler | IN | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Charleston Mill Service | Huger | SC | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Columbia City Mill Services | Columbia City | IN | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Fulton Mill Service | Delta | OH | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Levy Big River | Osceola | AR | 100–499 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Levy Gallatin Mill Service | Ghent | KY | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Levy NYS Mill Service | Blytheville | AR | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba Levy Texas Mill Services | Sinton | TX | 20–99 | ◐ LIKELY ACTIVE |
| LELevy Environmental Services Company dba SeaTac Steel Mill and Recycling Services | Seattle | WA | 1–19 | ◐ LIKELY ACTIVE |
| LWLiberty Wire Johnstown | Johnstown | PA | 100–499 | ◐ LIKELY ACTIVE |
| LWLiberty Wire Solon | Solon | OH | 20–99 | ◐ LIKELY ACTIVE |
| LOLockport Operations | Loc | NY | 20–99 | ◐ LIKELY ACTIVE |
| LCLoos & Co., Inc. Pomfret | Pomfret Center | CT | 100–499 | ◐ LIKELY ACTIVE |
| LMLoucks Mill | York | PA | 20–99 | ◐ LIKELY ACTIVE |
| LLLSM - Latrobe | Latrobe | PA | 500+ | ◐ LIKELY ACTIVE |
| LSLSM - Sandy Creek | Franklin | PA | 20–99 | ◐ LIKELY ACTIVE |
| LWLSM - Wauseon | Wauseon | OH | 1–19 | ◐ LIKELY ACTIVE |
| MMMarion Manufacturing, Inc. | Marion | KS | 20–99 | ◐ LIKELY ACTIVE |
| MIMar-Mac Industries, Inc. | Mcbee | SC | 20–99 | ◐ LIKELY ACTIVE |
| MBMaster Builders & Erectors CORP | Folcroft | PA | — | ◐ LIKELY ACTIVE |
| MSMaverick Steel Group, LLC | Hendersonville | NC | — | ◐ LIKELY ACTIVE |
| MFMedford Fabrication | Medford | OR | 1–19 | ◐ LIKELY ACTIVE |
| MJMedtronic JAXs | Jacksonville | FL | 500+ | ◐ LIKELY ACTIVE |