| Muckleshoot Indian Tribe WA | Arts & Entertainment | 0 | — | C |
| Mud Bay WA | Retail Trade | 0 | — | F |
| Mud Buddy, LLC UT | Wholesale Trade | 0 | — | F |
| Mudd Inc. IA | Professional & Technical Services | 0 | — | A |
| Mudder Trucker GA | Retail Trade | 0 | — | A |
| Muddy Branch Veterinary Center MD | Professional & Technical Services | 0 | — | A |
| MudMasters WV | Mining & Extraction | 0 | — | F |
| MUDRASYS, INC CA | Professional & Technical Services | 5 | $101,246 | — |
| Mudshark Studios OR | Manufacturing | 0 | — | F |
| Mudsmith, Ltd TX | Mining & Extraction | 0 | — | A |
| Mueller AL | Manufacturing | 0 | — | C |
| Mueller and Wilson Inc. TX | Construction | 0 | — | F |
| MUELLER BROTHERS TIMBER INC MO | Manufacturing | 0 | — | D |
| Mueller Co. LLC GA | Manufacturing | 3 | $130,247 | — |
| Mueller Co. LLC TN | Manufacturing | 0 | — | A |
| Mueller Construction Company LLC TX | Construction | 0 | — | A |
| Mueller Corporation MA | Manufacturing | 0 | — | F |
| Mueller Excavating, Inc. WI | Construction | 0 | — | A |
| Mueller Inc. AZ | Manufacturing | 0 | — | A |
| Mueller Inc. LA | Manufacturing | 0 | — | B |
| Mueller Inc. TX | Manufacturing | 0 | — | F |
| Mueller Industries MI | Manufacturing | 0 | — | F |
| Mueller Industries Inc UT | Manufacturing | 0 | — | F |
| Mueller Industries Inc. MD | Manufacturing | 0 | — | D |
| Mueller Industries, Inc. AR | Manufacturing | 0 | — | A |
| Mueller Industries, Inc. AZ | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. CA | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. FL | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. GA | Manufacturing | 0 | — | B |
| Mueller Industries, Inc. IL | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. IN | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. MS | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. NC | Manufacturing | 0 | — | C |
| Mueller Industries, Inc. NJ | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. OH | Manufacturing | 0 | — | B |
| Mueller Industries, Inc. TN | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. TX | Manufacturing | 0 | — | F |
| Mueller Industries, Inc. VA | Manufacturing | 0 | — | F |
| Mueller Lumber Company SD | Construction | 0 | — | F |
| Mueller Plastics Corp. FL | — | 0 | — | — |
| Mueller Services, Inc NY | Other Services | 0 | — | F |
| MUELLER SPORTS MEDICINE, Inc WI | Manufacturing | 0 | — | F |
| Mueller Water Conditioning, Inc TX | Wholesale Trade | 0 | — | A |
| Mueller Water Products AL | Manufacturing | 0 | — | F |
| Mueller Water Products IL | Manufacturing | 0 | — | F |
| Mueller Water Products KS | Manufacturing | 0 | — | A |
| Mueller Water Products TN | Manufacturing | 0 | — | F |
| Mueller Yurgae Associates IA | Wholesale Trade | 0 | — | A |
| Mueller Yurgae Associates KS | Wholesale Trade | 0 | — | B |
| Muench-Zreuzer Candle Company NY | — | 0 | — | — |
