| WMWashington Mills Electro Minerals CORP | North Grafton, MA | Nonmetallic Mineral Product Manufacturing327910 | — | ◐ LIKELY ACTIVE |
| WWoon-tech | Whitinsville, MA | Nonmetallic Mineral Product Manufacturing327215 | — | ◐ LIKELY ACTIVE |
| 7L77 Leicester Street LLC | North Oxford, MA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| ABAbbott Bioresearch Center | Worcester, MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ABAbbvie Biologics | Worcester, MA | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| ANActega North America | Shrewsbury, MA | Chemical Manufacturing325910 | — | ◇ UNVERIFIED |
| AMAdvanced Microsensors | Shrewsbury, MA | Computer and Electronic Product Manufacturing334112 | — | ◇ UNVERIFIED |
| AWAd Worcester | Worcester, MA | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| ACAearo CO | Warren, MA | Machinery Manufacturing333314 | — | ◇ UNVERIFIED |
| AIAggregate Industries | Sutton, MA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| AIAggregate Industries Concrete | Grafton, MA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
 Algonquin Industries INC | Hopedale, MA | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| AMAllegro Microsystems INC | Worcester, MA | Computer and Electronic Product Manufacturing334113 | — | ◇ UNVERIFIED |
| AOAmerican Optical | Southbridge, MA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
 American Polymers | Oxford, MA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| APAmerican Pressed Aluminum CO | Worcester, MA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| ARAmerican Reclamation | Charlton, MA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| ACAnderson Corporation | Worcester, MA | Fabricated Metal Product Manufacturing332213 | — | ◇ UNVERIFIED |
| AWAnderson Woodturning | Gardner, MA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| AWAndreu World America, LLC | Gardner, MA | Machinery Manufacturing333132 | — | ◇ UNVERIFIED |
| AFAshburnham Finishing | Ashburnham, MA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| AAAspen Aerogels INC | Northborough, MA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| AAstrazeneca | Westborough, MA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ATAthol Table Manufacturing | Athol, MA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| AGAtlantic Graphic Svc INC | Clinton, MA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| AMAuburn Mall | Auburn, MA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| BSBay State Circuits | Millbury, MA | Computer and Electronic Product Manufacturing334412 | — | ◇ UNVERIFIED |
| BIBc Industries | Oxford, MA | Fabricated Metal Product Manufacturing332999 | — | ◇ UNVERIFIED |
| BWBellecraft Woodworking | Winchendon, MA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| BPBirch Point Paper Products INC | Fitchburg, MA | Paper Manufacturing322220 | — | ◇ UNVERIFIED |
| BTBodycote Thermal Processing | Worcester, MA | Fabricated Metal Product Manufacturing332811 | — | ◇ UNVERIFIED |
| BCBond Construction Corporation | Spencer, MA | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| BFBoudreau Finishing | Winchendon, MA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| BABullard Abrasive Products | Westborough, MA | Nonmetallic Mineral Product Manufacturing327910 | — | ◇ UNVERIFIED |
| BIBurgess Investment CO | Grafton, MA | Leather and Allied Product Manufacturing316999 | — | ◇ UNVERIFIED |
| CCCambium Corporation | Athol, MA | Miscellaneous Manufacturing339995 | — | ◇ UNVERIFIED |
| CCameron | Millbury, MA | Fabricated Metal Product Manufacturing332911 | — | ◇ UNVERIFIED |
| CCCarbon Composites INC | Leominster, MA | Electrical Equipment, Appliance & Component Manufacturing335991 | — | ◇ UNVERIFIED |
| CHCastrol Heavy Duty Lubricants | Worcester, MA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| CRC&c Realty Carrier | Winchendon, MA | Furniture and Related Product Manufacturing337127 | — | ◇ UNVERIFIED |
| CLCersosimo Lumber CO INC | Hardwick, MA | Wood Product Manufacturing321999 | — | ◇ UNVERIFIED |
| CFCharlette Foundry | Blackstone, MA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| CCChase Coating & Laminating | Oxford, MA | Electrical Equipment, Appliance & Component Manufacturing335999 | — | ◇ UNVERIFIED |
| CPChase Precast Div of Oldcastle | North Brookfield, MA | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| CCChemdesign CORP | Fitchburg, MA | Chemical Manufacturing325000 | — | ◇ UNVERIFIED |
| CCChurchill Coatings | Auburn, MA | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| CMCincinnati Milacron-heald CORP | Worcester, MA | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| CFClaremont Flock | Leominster, MA | Textile Mills313310 | — | ◇ UNVERIFIED |
| CLClearplas LLC | Leominster, MA | Miscellaneous Manufacturing339115 | — | ◇ UNVERIFIED |
| CNCommunity Newspaper Company | Auburn, MA | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
