| MRMartin Rubber Corporation | La Habra | CA | — | ◇ UNVERIFIED |
| MFMaster Fabrication | Carson | CA | — | ◇ UNVERIFIED |
| MLMco2, LLC | Aurora | OH | — | ◇ UNVERIFIED |
| MRMitchell Rubber Products INC | Mira Loma | CA | — | ◇ UNVERIFIED |
| MRMolded Rubber and Plastics CORP | Largo | FL | — | ◇ UNVERIFIED |
| MRMorse Rubber, LLC | Keokuk | IA | — | ◇ UNVERIFIED |
| MMoxness | East Troy | WI | — | ◇ UNVERIFIED |
| MPM P Industries, INC. | Tyler | TX | — | ◇ UNVERIFIED |
| MGMti Groendyk | Buchanan | VA | — | ◇ UNVERIFIED |
| MSMti Specialty Silicones | Milton | FL | — | ◇ UNVERIFIED |
| NMNance Manufacturing, INC. | Anthony | KS | — | ◇ UNVERIFIED |
| NONational O-ring (dba Hutchinson Seal Corp) | Downey | CA | — | ◇ UNVERIFIED |
| NCNishikawa Cooper LLC | Fort Wayne | IN | — | ◇ UNVERIFIED |
| NCNishikawa Cooper LLC | Bremen | IN | — | ◇ UNVERIFIED |
| NMNoffsinger Manufacturing CO INC | Menahga | MN | — | ◇ UNVERIFIED |
| NANorth American Custom Racks INC | Wixom | MI | — | ◇ UNVERIFIED |
| NANorth American Molded Products | Hartville | OH | — | ◇ UNVERIFIED |
| OHObermeyer Hydro, INC | Wellington | CO | — | ◇ UNVERIFIED |
| OSOperational Support Services LLC | Findlay | OH | — | ◇ UNVERIFIED |
| OROzark Rubber Products INC. | Noel | MO | — | ◇ UNVERIFIED |
| PMParamont Manufacturing LLC | Abingdon | VA | — | ◇ UNVERIFIED |
| PIParco INC | Ontario | CA | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP | Woodridge | IL | — | ◇ UNVERIFIED |
| PHParker Hannifin Powertrain Div | Iron Gate | VA | — | ◇ UNVERIFIED |
| PHParker Hannifin Tech Seal Div | Wilson | NC | — | ◇ UNVERIFIED |
| PTParker Tech Seal | Gothenburg | NE | — | ◇ UNVERIFIED |
| PNPeoples Natural Gas CO Llc/roaring Run Sta | Apollo | PA | — | ◇ UNVERIFIED |
| PIPetco INC | Lake Forest | IL | — | ◇ UNVERIFIED |
 Pierce Roberts Rubber CO. | Trenton | NJ | — | ◇ UNVERIFIED |
| PPPipedream Products LLC | Chatsworth | CA | — | ◇ UNVERIFIED |
| PMPmr-precision Mfg & Rubber CO INC | Ontario | CA | — | ◇ UNVERIFIED |
| PTPolymeric Technology INC Dba Poly-tek | San Leandro | CA | — | ◇ UNVERIFIED |
| PTPolymeric Technology, INC. (poly-tek) | San Leandro | CA | — | ◇ UNVERIFIED |
| PRPolyonics Rubber CO INC | Poplar Grove | IL | — | ◇ UNVERIFIED |
| PSPoly Seal Industries | Berkeley | CA | — | ◇ UNVERIFIED |
| PPPrecix Plant D | New Bedford | MA | — | ◇ UNVERIFIED |
| PPPremier Products INC | Braham | MN | — | ◇ UNVERIFIED |
| PCPress-seal Corporation | Fort Wayne | IN | — | ◇ UNVERIFIED |
| PMPromed Molded Products INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| QSQuality Synthetic Rubber (3i Inc) | Jasper | GA | — | ◇ UNVERIFIED |
| RDR & D Metal Fabricators | Huntington Beach | CA | — | ◇ UNVERIFIED |
 R D Rubber Technology | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| RVRed Valve Company | Gastonia | NC | — | ◇ UNVERIFIED |
| RAReliance Aeroproducts International, INC | Mansfield | TX | — | ◇ UNVERIFIED |
| RHRex Hide Industries INC | Grafton | WV | — | ◇ UNVERIFIED |
| RRRio Rubber Track, Inc. | Temecula | CA | — | ◇ UNVERIFIED |
| RCRitus CORP | Milwaukee | WI | — | ◇ UNVERIFIED |
| RIRobin Industries Cleveland Manufacturing Division | Cleveland | OH | — | ◇ UNVERIFIED |
| RRRobinson Rubber Products CO INC | Minneapolis | MN | — | ◇ UNVERIFIED |
| RCRogers CORP Willimantic | South Windham | CT | — | ◇ UNVERIFIED |
