| Matrix Sciences WI | Professional & Technical Services | 0 | — | A |
| Matrix Sciences International Inc. CA | Professional & Technical Services | 0 | — | A |
| Matrix Sciences International Inc. IL | Professional & Technical Services | 0 | — | F |
| Matrix Sciences International Inc. MA | Professional & Technical Services | 0 | — | F |
| Matrix Sciences International Inc. SD | Professional & Technical Services | 0 | — | A |
| Matrix Service WA | Manufacturing | 0 | — | A |
| Matrix Service Company OK | Management of Companies | 0 | — | A |
| Matrix Structural Engineers TX | Professional & Technical Services | 1 | $120,000 | — |
| Matrix Surfaces Inc CA | Construction | 0 | — | F |
| Matrix Systems Group, Inc. IL | Professional & Technical Services | 1 | $99,840 | — |
| Matrix Tech Solutions Inc TX | Professional & Technical Services | 1 | $91,291 | — |
| MATRIX TOOL AND MACHINE, INC. OH | Manufacturing | 0 | — | A |
| Matrix Tool Inc. PA | Manufacturing | 0 | — | C |
| Matrix Transportation MI | Transportation & Warehousing | 0 | — | C |
| Matrix4 IL | Manufacturing | 0 | — | F |
| Matrix5 Site Development OH | Construction | 0 | — | D |
| MatrixCare, Inc. MN | Information & Media | 6 | $111,148 | — |
| MATROS AUTOMATED ELECTRICAL CONSTRUCTION CORP. NY | Construction | 0 | — | D |
| Mats Inc. MA | Retail Trade | 1 | $175,000 | — |
| Matson Logistics CA | Professional & Technical Services | 0 | — | A |
| Matson Logistics GA | Professional & Technical Services | 0 | — | A |
| Matson Logistics IL | Professional & Technical Services | 0 | — | A |
| Matson Logistics OH | Professional & Technical Services | 0 | — | A |
| Matson Logistics Warehousing CA | Transportation & Warehousing | 0 | — | B |
| Matson Logistics Warehousing GA | Transportation & Warehousing | 0 | — | A |
| Matson Navigation Company CA | Transportation & Warehousing | 4 | $149,833 | — |
| MATSON NAVIGATION COMPANY OF ALASKA LLC ANCHORAGE AK | Transportation & Warehousing | 0 | — | F |
| MATSON NAVIGATION COMPANY OF ALASKA LLC KODIAK AK | Transportation & Warehousing | 0 | — | F |
| Matson Navigation Company of Alaska, llc WA | Transportation & Warehousing | 0 | — | D |
| Matson Terminals, Inc. GU | Transportation & Warehousing | 0 | — | A |
| Matson Terminals, Inc. HI | Transportation & Warehousing | 0 | — | F |
| Matsu Ohio OH | — | 0 | — | — |
| Matsui America, Inc. IL | Wholesale Trade | 0 | — | A |
| Matsui Nursery, Inc CA | Agriculture & Forestry | 0 | — | F |
| Matsuo Industries USA, Inc. TN | Manufacturing | 0 | — | B |
| Matsuura Machinery USA MN | Wholesale Trade | 0 | — | A |
| Matt Bowers Ford Metairie LA | Retail Trade | 0 | — | A |
| MATT Construction Corp. CA | Construction | 0 | — | A |
| Matt LaGrande Farms CA | Agriculture & Forestry | 0 | — | F |
| Matt Pratt LLC - DBA A-Team Logistics FL | Transportation & Warehousing | 0 | — | A |
| Matt Rademan Company, LLC MO | Construction | 0 | — | A |
| Matt Saxe Chevrolet, Inc. MN | Retail Trade | 0 | — | A |
| Matt's Plumbing Services, Inc. FL | Construction | 0 | — | A |
| Matt-Con Services Corp NY | Construction | 0 | — | A |
| Matta Dental Care PLC IA | Healthcare & Social Assistance | 1 | $135,200 | — |
| Mattax Neu Prater MO | Healthcare & Social Assistance | 0 | — | A |
| MATTCO FORGE, INC CA | Manufacturing | 0 | — | F |
| Mattel PA | Transportation & Warehousing | 0 | — | A |
| Mattel WI | Transportation & Warehousing | 0 | — | A |
| Mattel HQ, Inc. CA | Manufacturing | 11 | $145,071 | A |
