| NNNorthwest Noble Metals | Spokane | WA | — | ◇ UNVERIFIED |
| NBNovelis Bay Minette Operating Site | Bay Minette | AL | — | ◇ UNVERIFIED |
| NMNull's Machine & Mfg., Inc., Huntington | Huntington | WV | — | ◇ UNVERIFIED |
| NDNyc Dept of Parks-columbia Smelting & Refining Works Site | Brooklyn | NY | — | ◇ UNVERIFIED |
| OIOcm Industries CORP. | Miami | FL | — | ◇ UNVERIFIED |
| OIOgs/cascade INC | Salem | OR | — | ◇ UNVERIFIED |
| OVOhio Valley Aluminum | Shelbyville | KY | — | ◇ UNVERIFIED |
| OVOhio Valley Aluminum C LLC Niles Facilit | Niles | OH | — | ◇ UNVERIFIED |
| OVOhio Valley Aluminum CO. LLC | Boonville | IN | — | ◇ UNVERIFIED |
| ONOil-dri North and South Plant | Ochlocknee | GA | — | ◇ UNVERIFIED |
| OTOil Technology INC | East Chicago | IN | — | ◇ UNVERIFIED |
| OIOk Iron and Metal / Metal Reclamation Faclty | Ardmore | OK | — | ◇ UNVERIFIED |
| OBOldani Brothers LLC | North Kingstown | RI | — | ◇ UNVERIFIED |
| OOOmni Oxide CORP Ohio Oxide Div | Lancaster | OH | — | ◇ UNVERIFIED |
| OOOmni Oxide Georgia Oxide | Lithonia | GA | — | ◇ UNVERIFIED |
| OMOmnisource - Montvale | Montvale | VA | — | ◇ UNVERIFIED |
| OSOmnisource Sturgis | Sturgis | MI | — | ◇ UNVERIFIED |
| OVOmya Verpol Plant | Florence | VT | — | ◇ UNVERIFIED |
| OMOpta Minerals Harseeville Plant | Hardeeville | SC | — | ◇ UNVERIFIED |
| OPOswego Public Works Department | Oswego | NY | — | ◇ UNVERIFIED |
| OJOunce Jewelry INC Dba Ounce Collection INC | Los Angeles | CA | — | ◇ UNVERIFIED |
| OHOwls Head Alloys | West Point | MS | — | ◇ UNVERIFIED |
| OCOzinga Cement Incorporated Contractor of Cleveland-cliffs Bu | Burns Harbor | IN | — | ◇ UNVERIFIED |
| OSOzinga Slag LLC | East Chicago | IN | — | ◇ UNVERIFIED |
| PCPacific Custom Materials | Stockton | CA | — | ◇ UNVERIFIED |
| PPPacific Power Vac - Portland Facility | Portland | OR | — | ◇ UNVERIFIED |
| PVPalmetto Vermiculite | Woodruff | SC | — | ◇ UNVERIFIED |
| PMPaul Matsumoto | Rio Linda | CA | — | ◇ UNVERIFIED |
| PSPauls Station of Webster | Rochester | NY | — | ◇ UNVERIFIED |
| PTPebble Technology International | Pearl River | LA | — | ◇ UNVERIFIED |
| PAPeerless Alloy INC | Denver | CO | — | ◇ UNVERIFIED |
 Penco Products INC | Vicksburg | MS | — | ◇ UNVERIFIED |
| PRPenn Rock Aggregates | North Versailles | PA | — | ◇ UNVERIFIED |
| PSPennsy Supply Summit Sta/quarry Wayne Twp | Summit Station | PA | — | ◇ UNVERIFIED |
| PCPerformance Construction LLC | Kissimmee | FL | — | ◇ UNVERIFIED |
| PPPerlite Processing Plant | Fallon | NV | — | ◇ UNVERIFIED |
| PVPerlite Vermiculite Packaging Industries INC. | North Bloomfield | OH | — | ◇ UNVERIFIED |
| PMPhoenix Metals of Pennsylvania, INC. | Butler | PA | — | ◇ UNVERIFIED |
| PSPhoenix Services LLC | Roanoke | VA | — | ◇ UNVERIFIED |
| PWPimalco (a Wholly-owned Subsidiary of Alcoa) | Chandler | AZ | — | ◇ UNVERIFIED |
| PAPioneer Air Systems INC | Wartburg | TN | — | ◇ UNVERIFIED |
| PMPittsburgh Metal & Equipment CO | Jersey City | NJ | — | ◇ UNVERIFIED |
| PIPlacerville Industries | Placerville | CA | — | ◇ UNVERIFIED |
| PSP&l Scrap Metal Iron INC | Colorado Springs | CO | — | ◇ UNVERIFIED |
| PPmr | Englewood | CO | — | ◇ UNVERIFIED |
| PEPowerhouse Entertainment LLC | North Hollywood | CA | — | ◇ UNVERIFIED |
| PMPower Mount INC | Somerset | KY | — | ◇ UNVERIFIED |
| PJPrecious Jackson Metals LLC | Mamaroneck | NY | — | ◇ UNVERIFIED |
| PMPrecious Metal Buyers, LLC | Tampa | FL | — | ◇ UNVERIFIED |
| PMPrecious Metal Refiners, INC. | Englewood | CO | — | ◇ UNVERIFIED |
