| MSMechanical Systems INC | Dundas | MN | — | ◇ UNVERIFIED |
| MMMeddco Metals | Hayward | CA | — | ◇ UNVERIFIED |
| MAMedic Air LLC | Santa Ana | CA | — | ◇ UNVERIFIED |
| MIMee Industries,Inc | Azusa | CA | — | ◇ UNVERIFIED |
| MCMelink Corporation | Knoxville | TN | — | ◇ UNVERIFIED |
| MIMenold, INC | Essington | PA | — | ◇ UNVERIFIED |
| MBMercedes Benz of Walnut Creek | Walnut Creek | CA | — | ◇ UNVERIFIED |
| MMMericle Mechanical, INC | Placentia | CA | — | ◇ UNVERIFIED |
 Merlin Industries, INC. | Davie | FL | — | ◇ UNVERIFIED |
| MSMerlin Solar Technologies, INC | San Jose | CA | — | ◇ UNVERIFIED |
| MMMermaid Manufacturing of Southwest Florida, INC. | Fort Myers | FL | — | ◇ UNVERIFIED |
| MTMetal Techniques INC | Canoga Park | CA | — | ◇ UNVERIFIED |
| M3Metcor 360 INC | Gardena | CA | — | ◇ UNVERIFIED |
| MIMetec, INC. | Daytona Beach | FL | — | ◇ UNVERIFIED |
| MEMetropolitan Enterprises INC | Waldorf | MD | — | ◇ UNVERIFIED |
| MIMez Industries, INC. | Covina | CA | — | ◇ UNVERIFIED |
| MCMicro Cooling Concepts, INC. | Huntington Beach | CA | — | ◇ UNVERIFIED |
| MPMicroera Power at Ahead Energy | Rochester | NY | — | ◇ UNVERIFIED |
| MCMid-state Correctional Facility | Marcy | NY | — | ◇ UNVERIFIED |
| MCMidwest Cooling Tower Services, INC. | Krotz Springs | LA | — | ◇ UNVERIFIED |
| MEMifek Enterprises INC Dba Mountain Power Hydraulic | Mountain Lake | MN | — | ◇ UNVERIFIED |
| MHMile High Equipment CO | Denver | CO | — | ◇ UNVERIFIED |
| MSMiller Sheet Metal & Heating, INC. | Kenai | AK | — | ◇ UNVERIFIED |
| MSMkm Sarasota LLC | Sarasota | FL | — | ◇ UNVERIFIED |
| MLM Lewis Holdings LLC | Elkhart | IN | — | ◇ UNVERIFIED |
| MLM & L Metals INC | Hayward | CA | — | ◇ UNVERIFIED |
| MAMmci Acquisition LLC Dba Mortech Manufacturing | Azusa | CA | — | ◇ UNVERIFIED |
| MAModine Aftermarket Holdings INC | Miami | FL | — | ◇ UNVERIFIED |
| MAModine Airsystems INC | Saint Paul | MN | — | ◇ UNVERIFIED |
 Modine Manufacturing Co-modine Manufacturing CO | Camdenton | MO | — | ◇ UNVERIFIED |
| Modine Manufacturing Company - Lexington | Lexington | VA | — | ◇ UNVERIFIED |
| Modine Manufacturing Grenada Lal | Grenada | MS | — | ◇ UNVERIFIED |
| MTModine Transferencia De Calor Sa De Cv | Laredo | TX | — | ◇ UNVERIFIED |
| MMMonaghan Mechanical, INC. | Coeur D Alene | ID | — | ◇ UNVERIFIED |
| MPMonolithic Power Systems INC | San Jose | CA | — | ◇ UNVERIFIED |
| MMMoorehead Machinery and Boiler Company | Wheatland | WY | — | ◇ UNVERIFIED |
| MMMorgantown Machine & Hydraulics | Indiana | PA | — | ◇ UNVERIFIED |
| MMMorgantown Machine & Hydraulics of West Virginia, INC. | Morgantown | WV | — | ◇ UNVERIFIED |
| MPMortex Product Dba Summit Mfg Ft W | Fort Worth | TX | — | ◇ UNVERIFIED |
| MCMotion Controls, LLC | Hartford | WI | — | ◇ UNVERIFIED |
| MIMotion Industries, INC. | Birmingham | AL | — | ◇ UNVERIFIED |
| MSMotiv Space Systems | Pasadena | CA | — | ◇ UNVERIFIED |
| MSMountain States Industrial Services | Salt Lake City | UT | — | ◇ UNVERIFIED |
| MVMountain Valley Home Comfort INC. | Winchester | VA | — | ◇ UNVERIFIED |
| MIMpd INC | Santa Ana | CA | — | ◇ UNVERIFIED |
| MMMTE Mechanical,Inc. | Van Nuys | CA | — | ◇ UNVERIFIED |
| MIMunroe, INC. | Ambridge | PA | — | ◇ UNVERIFIED |
| MIMunroe, INC. | Ringgold | GA | — | ◇ UNVERIFIED |
| MCMunters Corporation | Natural Bridge Station | VA | — | ◇ UNVERIFIED |
| MVMustang Vacuum Systems | Sarasota | FL | — | ◇ UNVERIFIED |
| MLMwdc, LLC | Mission | KS | — | ◇ UNVERIFIED |
| MIMyrtle Industries INC | Jackson | MI | — | ◇ UNVERIFIED |
| NCNalco Company | Ontario | CA | — | ◇ UNVERIFIED |
| NINanonexus, INC | San Jose | CA | — | ◇ UNVERIFIED |
| NBNational Boiler Service, INC. | Panama City | FL | — | ◇ UNVERIFIED |
| NBNational Boiler Service, INC. | Queen City | TX | — | ◇ UNVERIFIED |
| NBNational Boiler Services INC. | Covington | VA | — | ◇ UNVERIFIED |
| NCNational Coil Wwtf | Longview | TX | — | ◇ UNVERIFIED |
| NSNational Serv Ind INC Lithoni | Industry | CA | — | ◇ UNVERIFIED |
| NLNederman LLC Dba Nordfab Ducting | Sparks | NV | — | ◇ UNVERIFIED |
| NNNexagen Networks INC. | Aberdeen | MD | — | ◇ UNVERIFIED |
| NSNexcoil Steel LLC | Stockton | CA | — | ◇ UNVERIFIED |
| NINfe, INC. | Jacksonville | FL | — | ◇ UNVERIFIED |
| NMNh Manufacturing | San Jose | CA | — | ◇ UNVERIFIED |
| NNorcold (0375010146) | Sidney | OH | — | ◇ UNVERIFIED |
| NMNordson Medical | Ventura | CA | — | ◇ UNVERIFIED |
| NNordyne | O Fallon | MO | — | ◇ UNVERIFIED |
| NINordyne Inc-boonville Plant | Boonville | MO | — | ◇ UNVERIFIED |
| NGNortek Global Hvac | Poplar Bluff | MO | — | ◇ UNVERIFIED |
| NPNortheast Philadelphia Airport Federal Aviation Administration | Philadelphia | PA | — | ◇ UNVERIFIED |
| NCNorthern California Valley Sheetmetal Training Center | Mather | CA | — | ◇ UNVERIFIED |
| NFNorthwest Florida Ac, LLC | Inlet Beach | FL | — | ◇ UNVERIFIED |
| NPNorthwest Pipe and Casing | Clackamas | OR | — | ◇ UNVERIFIED |
| NHNsi Hvac | Bay Shore | NY | — | ◇ UNVERIFIED |
| NDNucor Data Systems | San Bernardino | CA | — | ◇ UNVERIFIED |
| ONO2 Natural Air LLC | South Bay | FL | — | ◇ UNVERIFIED |
| OAOasis Air Conditioning | Bakersfield | CA | — | ◇ UNVERIFIED |
| OHOhio Heat Transfer LLC | Saint Clairsville | OH | — | ◇ UNVERIFIED |
| OWOlympic Wire and Equipment | Turlock | CA | — | ◇ UNVERIFIED |
| OSOmega Sign & Lighting Inc/yesco Chicago | Addison | IL | — | ◇ UNVERIFIED |
| OCOn Call Heating & Air, LLC | Trussville | AL | — | ◇ UNVERIFIED |
| ODOreco Duct Systems, INC. | Covina | CA | — | ◇ UNVERIFIED |
| OIOrthalign, INC. | Aliso Viejo | CA | — | ◇ UNVERIFIED |
| OHOutfitters Hvac, INC. | Centerville | UT | — | ◇ UNVERIFIED |
| OPOverland Park Mechanical | Stilwell | KS | — | ◇ UNVERIFIED |
| PMPace Metal Works | Cerritos | CA | — | ◇ UNVERIFIED |
| PEPacheco Enterprises LLC | Cumming | GA | — | ◇ UNVERIFIED |
| PAPacific Award Metals | Pomona | CA | — | ◇ UNVERIFIED |
| PIPac-refco INC | Hesperia | CA | — | ◇ UNVERIFIED |
| PMPalisade Manufacturing Company | Palisade | MN | — | ◇ UNVERIFIED |
| PMPalisade Metalcraft INC | Costa Mesa | CA | — | ◇ UNVERIFIED |
| PDParamount Duct and Vent Cleaning LCC | Red Lodge | MT | — | ◇ UNVERIFIED |
| PEPar Engineering INC Dba Commercial Cooling | City of Industry | CA | — | ◇ UNVERIFIED |
| PParker | Plymouth | MI | — | ◇ UNVERIFIED |
| PBParker Boiler CO. | Commerce | CA | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP | Lyons | NY | — | ◇ UNVERIFIED |
| PCParker-hannifin CORP | Salt Lake City | UT | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Automotive Connectors Div. | Batesville | MS | — | ◇ UNVERIFIED |
| PHParker Hannifin Corp, Cylinder Div | Corona | CA | — | ◇ UNVERIFIED |
| PHParker Hannifin CORP Cylinder Division | Eugene | OR | — | ◇ UNVERIFIED |
