 Alsco Aluminum Corporation (alsco Aluminum, Corp.) | San Juan | PR | Primary Metal Manufacturing331221 | — | ● ACTIVE |
 Steel Services & Supplies INC | Toa Baja | PR | Primary Metal Manufacturing331110 | — | ● ACTIVE |
| MMMicromax Microcircuits Industries LTD | Manati | PR | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| PRPuerto Rico Steel Products CORP | Coto Laurel | PR | Primary Metal Manufacturing331222 | 20-99 | ◐ LIKELY ACTIVE |
 Alonso & Carus Iron Works INC | Catano | PR | Primary Metal Manufacturing331111 | — | ◇ UNVERIFIED |
| ADAluminios De Pr | Punta Santiago | PR | Primary Metal Manufacturing331318 | 100-499 | ◐ LIKELY ACTIVE |
| JWJj Welding Desing LLC | Carolina | PR | Primary Metal Manufacturing331222 | — | ◐ LIKELY ACTIVE |
| OCOrtiz CORP. | Adjuntas | PR | Primary Metal Manufacturing331315 | — | ◐ LIKELY ACTIVE |
| CSCancel Services CORP | Ponce | PR | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| COCristaleria Orocovis | Orocovis | PR | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| EMEfrain Morales Hernandez | Carolina | PR | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| JRJuan Rosado Pagan | Salinas | PR | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| JRJuan Rosado Pagan | Salinas | PR | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
| PDProcesadora De Metales INC. | Dorado | PR | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| PWPro Windows and Doors MFG Inc | Luquillo | PR | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SPSchnitzer Puerto Rico, INC. | Salinas | PR | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| TBThe Battery Recycling Co., INC. | Arecibo | PR | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| THTony's Heavy Work, INC. | Orocovis | PR | Primary Metal Manufacturing331312 | — | ◇ UNVERIFIED |
| VAVent Alarm Corporation | Ponce | PR | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
