| MCMaster Cutting & Engineering INC | Santa Fe Springs | — | ◇ UNVERIFIED |
| MIMasters in Metal, Inc | Oxnard | — | ◇ UNVERIFIED |
 Matthews International Corporation | San Jacinto | — | ◇ UNVERIFIED |
| MIMcwane, INC. | Oakland | — | ◇ UNVERIFIED |
| MCMehas Construction | Rancho Cucamonga | — | ◇ UNVERIFIED |
| MCMemry Corporation | Menlo Park | — | ◇ UNVERIFIED |
| MMMendo Mill Lumber Company | Ukiah | — | ◇ UNVERIFIED |
| MDMercury Defense Systems INC | Cypress | — | ◇ UNVERIFIED |
| MBMetal Briquetting Company | Los Angeles | — | ◇ UNVERIFIED |
 Metalor Technologies USA | Los Angeles | — | ◇ UNVERIFIED |
| MRMetal Resources INC | Fontanta | — | ◇ UNVERIFIED |
| MSMetal Sales Manufacturing CORP | Woodland | — | ◇ UNVERIFIED |
| MRMetech Recycling | Gilroy | — | ◇ UNVERIFIED |
| MMMichael Miraula | North Hollywood | — | ◇ UNVERIFIED |
| MMMicro Metals | Richmond | — | ◇ UNVERIFIED |
| MFMid-west Fabricating Co, West Bent Bolt | Santa Fe Springs | — | ◇ UNVERIFIED |
| MCMike Clarksean & Diane Foran | Bakersfield | — | ◇ UNVERIFIED |
| MIMiranda Iron Works Inc. | Lake Elsinore | — | ◇ UNVERIFIED |
| MMMission Metals | Rialto | — | ◇ UNVERIFIED |
 M&l Precision Machining INC | Morgan Hill | — | ◇ UNVERIFIED |
| MBMontclair Bronze INC | Montclair | — | ◇ UNVERIFIED |
| MSMonterey Sculpture Center | Sand City | — | ◇ UNVERIFIED |
| MMoozcomp | Santa Monica | — | ◇ UNVERIFIED |
| MSM Stephens Mfg INC | Cudahy | — | ◇ UNVERIFIED |
| MIMtm Industrial | Oceanside | — | ◇ UNVERIFIED |
| MEMvi Engineering & Manufacturing INC | Ontario | — | ◇ UNVERIFIED |
| MAMzd Acquisitions INC Dba Moz Designs INC | Oakland | — | ◇ UNVERIFIED |
| NCNamasco Corporation | Santa Fe Springs | — | ◇ UNVERIFIED |
| NSNanogen Solutions LLC | Hayward | — | ◇ UNVERIFIED |
| NINanosd INC Energy Nanotechnology R&d | San Diego | — | ◇ UNVERIFIED |
| NRNapa Redevelopment Partners, LLC | Napa | — | ◇ UNVERIFIED |
| NCNational City Foundry | San Diego | — | ◇ UNVERIFIED |
| NRNational Refining CORP | Orange | — | ◇ UNVERIFIED |
| NWNational Wire & Cable CORP | Los Angeles | — | ◇ UNVERIFIED |
| NSNet Shapes INC | Ontario | — | ◇ UNVERIFIED |
| NSNet Shapes INC | Ontario | — | ◇ UNVERIFIED |
| NENew England Lead Burning Co, INC | San Leandro | — | ◇ UNVERIFIED |
| NRNoranda Recycling INC | San Jose | — | ◇ UNVERIFIED |
| NSNorth South Machinery INC. | La Mirada | — | ◇ UNVERIFIED |
| NPNorthwest Pipe Company, LLC | Tracy | — | ◇ UNVERIFIED |
| NTNvent Thermal LLC | Redwood City | — | ◇ UNVERIFIED |
| OSO'brien Steel Erectors | Oakville | — | ◇ UNVERIFIED |
| OMOlympic Metal Cutting | Montebello | — | ◇ UNVERIFIED |
| OCOntario Castings, Performance Aluminum Products, Reeds Patterns & Molds, R&S ... | Ontario | — | ◇ UNVERIFIED |
| OEOntario Extrusions, INC. | Ontario | — | ◇ UNVERIFIED |
| OSOregon Steel Mills-fontana Div | Fontana | — | ◇ UNVERIFIED |
| OEOrlandini Enterprises | Commerce | — | ◇ UNVERIFIED |
| OJOunce Jewelry INC Dba Ounce Collection INC | Los Angeles | — | ◇ UNVERIFIED |
 O&y Precision INC | San Jose | — | ◇ UNVERIFIED |
| PHPacific Handy Cutter INC | Irvine | — | ◇ UNVERIFIED |
