| SCSpecialty Chemical | Quincy | Chemical Manufacturing | 325180 | 20–99 | ◐ LIKELY ACTIVE |
| HIHigdon Industries INC | Quincy | Furniture and Related Product Manufacturing | 337122 | — | ◇ UNVERIFIED |
| IPImerys Perlite Usa, INC | Quincy | Nonmetallic Mineral Product Manufacturing | 327992 | — | ◇ UNVERIFIED |
| PHPrinting House INC | Quincy | Printing and Related Support Activities | 323111 | — | ◇ UNVERIFIED |
| QJQuincy Joist Company | Quincy | Fabricated Metal Product Manufacturing | 332312 | — | ◇ UNVERIFIED |
| SRSmyrna Ready Mix - Plant #130 | Quincy | Nonmetallic Mineral Product Manufacturing | 327320 | — | ◇ UNVERIFIED |
| TTrulieve | Quincy | Chemical Manufacturing | 325411 | — | ◇ UNVERIFIED |
| THTrulieve Higdon Main | Quincy | Chemical Manufacturing | 325411 | 100–499 | ◐ LIKELY ACTIVE |
| TQTrulieve Quincy | Quincy | Chemical Manufacturing | 325411 | 1–19 | ◐ LIKELY ACTIVE |
| BDBeaulieu Design Group, LLC | Quincy | Plastics and Rubber Products Manufacturing | 326199 | — | ◇ UNVERIFIED |
| CCClariant Corporation - Quincy Operation | Quincy | Nonmetallic Mineral Product Manufacturing | 327992 | — | ◇ UNVERIFIED |
| FBFlowers Bakery | Quincy | Food Manufacturing | 311812 | — | ◇ UNVERIFIED |
| HLHomes & Land Publishing CORP. | Quincy | Printing and Related Support Activities | 323119 | — | ◇ UNVERIFIED |
| WKWhat Kind Cupcakery | Quincy | Food Manufacturing | 311811 | — | ◇ UNVERIFIED |