| MLMarble Lite Products INC | Hialeah Gardens | FL | Plastics and Rubber Products Manufacturing326191 | — | ◇ UNVERIFIED |
| MPMarch Performance INC | Naples | FL | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| MMMarina Mile Yachting Center | Fort Lauderdale | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MRMarina Road Boat Yard | Fort Lauderdale | FL | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| MIMarine Industrial Services INC | Jacksonville | FL | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| MEMarinemax East INC | Sarasota | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MEMarinemax East, INC | Stuart | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MMMarinemax Miami | Miami | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MNMarinemax Naples | Naples | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MPMarinemax Pompano | Pompano Beach | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MMMarine Muffler Corporation | Apopka | FL | Plastics and Rubber Products Manufacturing326121 | — | ◇ UNVERIFIED |
| MSMarine Specialty Painting INC | Mayport | FL | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| MLMarlow-hunter LLC | Alachua | FL | Transportation Equipment Manufacturing336611 | — | ◇ UNVERIFIED |
| MMMar Marina | Tarpon Spgs | FL | Transportation Equipment Manufacturing336612 | — | ◇ UNVERIFIED |
| MEMartin Electronics, INC. | Perry | FL | Food Manufacturing311942 | — | ◇ UNVERIFIED |
| MBMaschmeyer - Brooksville | Brooksville | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MCMaschmeyer Cbp - Melbourne | Melbourne | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete Company - Apollo | Apollo Beach | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-deltona Concrete Batch Plant | Deltona | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete-st Cloud | Saint Cloud | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MCMaschmeyer Concrete - Winter Beach | Winter Beach | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MBMasco Builder Cabinet Group | Ocala | FL | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
| MCMasonite Corporation | Tampa | FL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| MDMasonite Door Fabrication Services | Yulee | FL | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| MCMassman Companies, INC | Bradenton | FL | Machinery Manufacturing333993 | — | ◇ UNVERIFIED |
| MIMaster-halco INC | Tampa | FL | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| MLMasterrock, LLC | Sarasota | FL | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| MLMatheson - Lakeland | Lakeland | FL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| MWMatheson - West Palm Beach | Jupiter | FL | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
 Matrix Composites INC | Rockledge | FL | Transportation Equipment Manufacturing336413 | — | ◇ UNVERIFIED |
| MXMattress Xpress | Boynton Beach | FL | Furniture and Related Product Manufacturing337121 | — | ◇ UNVERIFIED |
| MDMax Davis Associates INC | West Palm Beach | FL | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| MCMaxville Chip Mill | Jacksonville | FL | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| MRMayo Ready Mix Concrete Sr 51 | Mayo | FL | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| MFMazella Fhs | Bartow | FL | Fabricated Metal Product Manufacturing332912 | — | ◇ UNVERIFIED |
| MAM.c. Assembly & Test, Incorporated | Melbourne | FL | Computer and Electronic Product Manufacturing334220 | — | ◇ UNVERIFIED |
| MGMccash Glass LLC | Naples | FL | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| MTMcgee Tire Stores, INC. | Eaton Park | FL | Plastics and Rubber Products Manufacturing326212 | — | ◇ UNVERIFIED |
| MMMdm Marble CO | Florida | FL | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
 Meadow Burke, LLC. | Tampa | FL | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| MMedtronic | Miami Lakes | FL | Miscellaneous Manufacturing339112 | — | ◇ UNVERIFIED |
| MUMel USA Property Holder I, LLC | Spring Hill | FL | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| MEMenlo Energy Florida, LLC | Dade City | FL | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
 Metal Culverts INC Florida Div | Clearwater | FL | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| MIMetal Industries-bushnell | Bushnell | FL | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| MIMetal Industries, INC | Crystal River | FL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
 Metal Industries, INC. | Clearwater | FL | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| MPMetals & Plastics INC | Longwood | FL | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MIMetric, INC. (jan Nylund) | Tampa | FL | Nonmetallic Mineral Product Manufacturing327120 | — | ◇ UNVERIFIED |
| MIMfm Industries INC | Reddick | FL | Leather and Allied Product Manufacturing316110 | — | ◇ UNVERIFIED |
