| BBBaltimore Biopark | Baltimore, MD | Chemical Manufacturing325412 | 100–499 | ◐ LIKELY ACTIVE |
| BBBaltimore Branch | Elkridge, MD | Food Manufacturing311520 | 20–99 | ◐ LIKELY ACTIVE |
| BBBaltimore Branch 19 | Baltimore, MD | Chemical Manufacturing325120 | 20–99 | ◐ LIKELY ACTIVE |
| BBBaltimore BWI | Harmans, MD | Chemical Manufacturing325412 | 500+ | ◐ LIKELY ACTIVE |
| BCBaltimore Comp Maint | Baltimore, MD | Fabricated Metal Product Manufacturing332439 | 1–19 | ◐ LIKELY ACTIVE |
| BMBaltimore MD - Holabird | Baltimore, MD | Transportation Equipment Manufacturing336212 | 20–99 | ◐ LIKELY ACTIVE |
| BPBaltimore Plant | Baltimore, MD | Beverage and Tobacco Product Manufacturing312111 | 20–99 | ◐ LIKELY ACTIVE |
| BNBarcelona Nut Company | Baltimore, MD | Food Manufacturing311911 | 20–99 | ◐ LIKELY ACTIVE |
| BWBasignani Winery, LTD. | Sparks, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BLBay Life Brewing | Jessup, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BRBay Ready Mix of Maryland Llc | Baltimore, MD | Nonmetallic Mineral Product Manufacturing327320 | 20–99 | ◐ LIKELY ACTIVE |
| BBBC - Belcamp, Maryland | Belcamp, MD | Chemical Manufacturing325998 | 100–499 | ◐ LIKELY ACTIVE |
| BDBD Diagnostic Systems - Baltimore | Sparks Glencoe, MD | Chemical Manufacturing325413 | 500+ | ◐ LIKELY ACTIVE |
| BBelcamp | Belcamp, MD | Fabricated Metal Product Manufacturing332431 | 20–99 | ◐ LIKELY ACTIVE |
| BWBent Wine Company LLC | Baltimore, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BWBetter Wine Co | Westminster, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BMBinkert's Meat Products, LLC | Baltimore, MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| BIBioqrypt INC | Severna Park, MD | Wood Product Manufacturing321999 | — | ◐ LIKELY ACTIVE |
| BABiosynthesis Ai LLC | Baltimore, MD | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| BVBirch View Vineyard | Manchester, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BBBlackstone Brothers, LLC | Finksburg, MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BCBlanchard Communications | Annapolis, MD | Computer and Electronic Product Manufacturing334220 | — | ◐ LIKELY ACTIVE |
| BIBlind Industries and Services of Maryland - Headquarters | Baltimore, MD | Textile Mills313230 | 100–499 | ◐ LIKELY ACTIVE |
| BPBlueprint Partners Corp | Baltimore, MD | Wood Product Manufacturing321992 | 20–99 | ◐ LIKELY ACTIVE |
| BVBoordy Vineyards, INC. | Hydes, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BBBowman's Butcher Shop, LLC | Aberdeen, MD | Food Manufacturing311611 | — | ◐ LIKELY ACTIVE |
| BCBoyd Cru Wines | Savage, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BPBrightcharm Proving Ground LLC | Baltimore, MD | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| BNBrilliant Neurotechnologies LLC | Ellicott City, MD | Computer and Electronic Product Manufacturing334510 | — | ◐ LIKELY ACTIVE |
| BRBrothers Ridge Cider | New Windsor, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BSBSA Seafood, LLC | Grasonville, MD | Food Manufacturing311710 | — | ◐ LIKELY ACTIVE |
| BLBucket, LLC | Columbia, MD | Electrical Equipment, Appliance & Component Manufacturing335132 | — | ◐ LIKELY ACTIVE |
| BHBull House Winery, LLC | Parkton, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| BDBullshine Distillery | Balimtore, MD | Beverage and Tobacco Product Manufacturing312140 | — | ◐ LIKELY ACTIVE |
| BPBW Papersystems | Cockeysville, MD | Machinery Manufacturing333243 | 100–499 | ◐ LIKELY ACTIVE |
| BUByk-gardner USA LLC | Columbia, MD | Computer and Electronic Product Manufacturing334516 | — | ◐ LIKELY ACTIVE |
| CMCabinet Max Corporation | Baltimore, MD | Furniture and Related Product Manufacturing337211 | 20–99 | ◐ LIKELY ACTIVE |
| CLCaci Lgs Innovations LLC | Jessup, MD | Computer and Electronic Product Manufacturing334290 | — | ◐ LIKELY ACTIVE |
| CACambridge Acquisition LLC | Baltimore, MD | Apparel Manufacturing315990 | — | ◐ LIKELY ACTIVE |
| CSCargill Salt White Marsh | White Marsh, MD | Chemical Manufacturing325998 | 20–99 | ◐ LIKELY ACTIVE |
| CCCaribbean Crescent Inc. | Baltimore, MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| CMCarlstan Machining, INC. | Halethorpe, MD | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |
| CDCasa di Pasta, Inc. | Baltimore, MD | Food Manufacturing311612 | — | ◐ LIKELY ACTIVE |
| CWCassinelli Winery & Vineyards | Church Hill, MD | Beverage and Tobacco Product Manufacturing312130 | — | ◐ LIKELY ACTIVE |
| CDCatierre Designs LLC | Baltimore, MD | Apparel Manufacturing315250 | — | ◐ LIKELY ACTIVE |
| CLCCL Label, Inc. | Baltimore, MD | Printing and Related Support Activities323111 | 100–499 | ◐ LIKELY ACTIVE |
| CTCea Technologies INC | Hanover, MD | Computer and Electronic Product Manufacturing334511 | — | ◐ LIKELY ACTIVE |
| CCCEL-SCI Corp -San Tomas | Elkridge, MD | Chemical Manufacturing325412 | 20–99 | ◐ LIKELY ACTIVE |
| CCCel-Sci Corp - Seton | Baltimore, MD | Chemical Manufacturing325412 | 1–19 | ◐ LIKELY ACTIVE |
| CECentral Engineering, INC. | Upperco, MD | Fabricated Metal Product Manufacturing332710 | — | ◐ LIKELY ACTIVE |