| MMMaterion - Milwaukee | Milwaukee | WI | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| MOMemphis Ops | Memphis | TN | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| MMetropolis-HSEMS | Metropolis | IL | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| MMidway | Midway | TN | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| MNMonolith Nebraska LLC - OC1 | Hallam | NE | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NPNanoscale Powders LLC | Boston | MA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| NPNatrium Products Inc | Cortland | NY | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NBNexpera - Borderland | El Paso | TX | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NBNexpera - Burnside | Darrow | LA | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NFNexpera - Fort Hill Plant | North Bend | OH | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NHNexpera Headquarters | Newark | DE | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NJNexpera James River | Richmond | VA | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NJNexpera Joliet | Channahon | IL | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| NMNexpera - Morses Mill | Linden | NJ | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NTNexpera Tamaqua | Tamaqua | PA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| NTNexpera texas Central | Baytown | TX | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| NSNexsjen Solutions LLC | Spring | TX | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| NFNouryon Functional Chemicals LLC | Radnor | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| NSNouryon - Silica | Green Bay | WI | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| NTNovalith Technologies, LLC | Baton Rouge | LA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| NANutrien Ag Solutions, INC. | Tucson | AZ | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| OBOld Bridge Minerals, Inc. | Old Bridge | NJ | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OFOld Fort Plant | Old Fort | OH | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OCOlin Corporation - Santa Fe Springs Plant | Santa Fe Springs | CA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| OBOmega Bio-tek - Oakbrook | Norcross | GA | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| OBOmega Bio-tek - Pinnacle | Norcross | GA | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| OEOrion Engineered Carbons LLC, Spring Office | Spring | TX | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| OPOxyChem-Convent Plant | Convent | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OPOxyChem-Geismar Plant | Geismar | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OPOxyChem-Ingleside Plant | Gregory | TX | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OPOxyChem-Taft Plant | Taft | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| OPOxyVinyls-Battleground Plant | La Porte | TX | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| PAPencco- AWT Sealy Shop | Sealy | TX | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| PGPencco- Gadsden Plant | Gadsden | AL | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| PGPencco- Glendale Plant | Glendale | AZ | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| PIPencco Inc Corporate | Sealy | TX | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| PIPencco Inc Middlesex Plant | Middlesex | NC | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| PAPioneer Americas LLC, Henderson Plant | Henderson | NV | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| PLPQ LLC Augusta Plant | Augusta, GA | GA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| PIPrayon Inc (Illinois) | Herrin | IL | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
Premier Magnesia - Aspers | Aspers | PA | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| QUQEMETICA US Silica - Barberton | Barberton | OH | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| QUQEMETICA US Silica LLC | Westlake | LA | Chemical Manufacturing325180 | 100-499 | ◐ LIKELY ACTIVE |
| RLRadqual LLC | Ammon | ID | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| RRRed Rock | Saint Paul | MN | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| RMReElement Marion Facility | Marion | IN | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
ReElement Technologies Pilot Plant | Noblesville | IN | Chemical Manufacturing325180 | 1-19 | ◐ LIKELY ACTIVE |
| RMRemnant Minerals Recovery LLC | Dripping Springs | TX | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| RRosemount | Rosemount | MN | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| RCRowell Chemical Corporation | Willow Springs | IL | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |