Atricure INC. | Mason | OH | Miscellaneous Manufacturing339112 | — | ● ACTIVE |
| HUHaag-streit Usa, INC | Mason | OH | Miscellaneous Manufacturing339112 | 100-499 | ● ACTIVE |
| KKK & K Precision, INC. | Mason | OH | Fabricated Metal Product Manufacturing332710 | 20-99 | ● ACTIVE |
L3harris Cincinnati Electronics Corporation | Mason | OH | Computer and Electronic Product Manufacturing334511 | 500+ | ● ACTIVE |
| MIMakino INC | Mason | OH | Machinery Manufacturing333513 | — | ● ACTIVE |
Compulor Systems LLC | Mason | OH | Computer and Electronic Product Manufacturing334111 | — | ● ACTIVE |
Jayco Industrial CORP. | Mason | OH | Machinery Manufacturing333998 | — | ● ACTIVE |
Rhinestahl Corporation | Mason | OH | Transportation Equipment Manufacturing336412 | — | ● ACTIVE |
Rhinestahl Corporation | Mason | OH | Fabricated Metal Product Manufacturing332710 | — | ● ACTIVE |
| TITeledyne Instruments INC | Mason | OH | Computer and Electronic Product Manufacturing334516 | — | ● ACTIVE |
Velocity Concept Development Group LLC | Mason | OH | Plastics and Rubber Products Manufacturing326199 | — | ● ACTIVE |
| MEMitsubishi Electric Automotive America (1483090295) | Mason | OH | Transportation Equipment Manufacturing336310 | 100-499 | ◐ LIKELY ACTIVE |
| AMArmor Metal Group | Mason | OH | Primary Metal Manufacturing331521 | 100-499 | ◐ LIKELY ACTIVE |
| BCBerenfield Containers INC | Mason | OH | Fabricated Metal Product Manufacturing332439 | — | ◐ LIKELY ACTIVE |
| LCL-3 Communications Cincinnati Electronics | Mason | OH | Computer and Electronic Product Manufacturing334119 | — | ◇ UNVERIFIED |
Armor Metal Group Mason, INC. | Mason | OH | Fabricated Metal Product Manufacturing332439 | — | ◐ LIKELY ACTIVE |
| DMDeerfield Manufacturing, Inc. d/b/a Ice Industries Deerfield | Mason | OH | Fabricated Metal Product Manufacturing332116 | 100-499 | ◐ LIKELY ACTIVE |
| HMHi-tek Manufacturing INC | Mason | OH | Fabricated Metal Product Manufacturing332710 | 100-499 | ◐ LIKELY ACTIVE |
| SBSonder Brewing, LLC | Mason | OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| APAprecia Pharmaceuticals, LLC | Mason | OH | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| FAFujitec America, INC. (1483000504) | Mason | OH | Machinery Manufacturing333921 | — | ◐ LIKELY ACTIVE |
| APAir Plastics INC. | Mason | OH | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| BABlackhawk Automotive Plastics, INC. | Mason | OH | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| JHJw Harris CO INC Dba Harris Products Group | Mason | OH | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| MCMulti-color Corporation (mcc-mason) | Mason | OH | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SUSpear USA | Mason | OH | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| 0G0g32 Global Chain Supply Management | Mason | OH | Apparel Manufacturing315280 | 20-99 | ◐ LIKELY ACTIVE |
| AWAshley Ward | Mason | OH | Fabricated Metal Product Manufacturing332722 | 20-99 | ◐ LIKELY ACTIVE |
| BTBent Tree Winery | Mason | OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| CCCarter Component Plant 537 | Mason | OH | Wood Product Manufacturing321214 | 20-99 | ◐ LIKELY ACTIVE |
| CBCincinnati Branch | Mason | OH | Machinery Manufacturing333995 | 1-19 | ◐ LIKELY ACTIVE |
| CSComplete Services, INC | Mason | OH | Furniture and Related Product Manufacturing337110 | — | ◐ LIKELY ACTIVE |
| FCFANUC - Central | Mason | OH | Machinery Manufacturing333998 | 20-99 | ◐ LIKELY ACTIVE |
Gamber-Johnson LLC - InfoCase | Mason | OH | Fabricated Metal Product Manufacturing332999 | 1-19 | ◐ LIKELY ACTIVE |
| GIGimbal Innovations INC | Mason | OH | Machinery Manufacturing333310 | — | ◐ LIKELY ACTIVE |
| GIGraphic Information Systems, INC. | Mason | OH | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| HIHoneywell Intelligrated Mason | Mason | OH | Machinery Manufacturing333922 | 500+ | ◐ LIKELY ACTIVE |
| JUJbs USA | Mason | OH | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| JHJ.W. Harris Co., Inc. - Mason | Mason | OH | Primary Metal Manufacturing331420 | 100-499 | ◐ LIKELY ACTIVE |
| MMason | Mason | OH | Fabricated Metal Product Manufacturing332439 | 20-99 | ◐ LIKELY ACTIVE |
| MOMason office | Mason | OH | Machinery Manufacturing333993 | 20-99 | ◐ LIKELY ACTIVE |
| MOMason, OH | Mason | OH | Computer and Electronic Product Manufacturing334220 | 20-99 | ◐ LIKELY ACTIVE |
| MDMasters Drug Company, INC. | Mason | OH | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| MVMio Vino, LLC | Mason | OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| MCMulti-Color Corporation - Mason F&B | Mason | OH | Printing and Related Support Activities323111 | 20-99 | ◐ LIKELY ACTIVE |
| PCPratt (Target Container), Inc. Mason, OH | Mason | OH | Paper Manufacturing322211 | 20-99 | ◐ LIKELY ACTIVE |
| RAremtec automation llc | Mason | OH | Machinery Manufacturing333999 | 20-99 | ◐ LIKELY ACTIVE |
| RTRocketforce Technologies LLC | Mason | OH | Transportation Equipment Manufacturing336415 | — | ◐ LIKELY ACTIVE |
| STSPX Technologies | Mason | OH | Machinery Manufacturing333413 | 100-499 | ◐ LIKELY ACTIVE |
| SVSweet Valley Cider | Mason | OH | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |