| BBBabycat Brewery, LLC | Kensington | MD | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| BMBakehouse MD, L.L.C. | Frederick | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BCBaklava Couture LLC | Rockville | MD | Food Manufacturing311821 | — | ◇ UNVERIFIED |
| BCBalt County Brewing, LLC | Parkton | MD | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| BBBaltimore Baked Goods INC | Baltimore | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BCBaltimore City Dept. of Housing | Baltimore | MD | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| BSBaltimore Steel Erectors LLC | White Marsh | MD | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| BPB/a Products CO. | Columbia | MD | Transportation Equipment Manufacturing336999 | — | ◇ UNVERIFIED |
| BABarbara Adams | Jessup | MD | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BIBardon, INC. | Clinton | MD | Petroleum and Coal Products Manufacturing324122 | — | ◇ UNVERIFIED |
| BIBardon, INC. Dba Aggregate Industries - Hollywood Asphalt | Hollywood | MD | Petroleum and Coal Products Manufacturing324121 | — | ◇ UNVERIFIED |
| BCBarton Cotton Printing Services | Baltimore | MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
 Batteries Plus Bulbs | Annapolis | MD | Electrical Equipment, Appliance & Component Manufacturing335110 | — | ◇ UNVERIFIED |
| BEBaugher Enterprises INC | Westminster | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BEBd Enterprises - Hagerstown, LLC | Hagerstown | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BEBd Enterprises, LLC | Lanham | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BEBd Enterprises, LLC | Lanham | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BCBear Creek Communications, LLC | Grantsville | MD | Electrical Equipment, Appliance & Component Manufacturing335929 | — | ◇ UNVERIFIED |
| BDBelicose Dynamics LLC | Upper Marlboro | MD | Transportation Equipment Manufacturing336211 | — | ◇ UNVERIFIED |
| BMBella Madero Corporation | Davidsonville | MD | Wood Product Manufacturing321113 | — | ◇ UNVERIFIED |
| BCBeltway Custom Cultured Marble, INC. | Whiteford | MD | Nonmetallic Mineral Product Manufacturing327991 | — | ◇ UNVERIFIED |
| BFBenjamin Fabricators, LLC | Silver Spring | MD | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BGBerry Global | Hannover | MD | Plastics and Rubber Products Manufacturing326160 | — | ◇ UNVERIFIED |
| BLBespoke, LLC | Churchville | MD | Furniture and Related Product Manufacturing337212 | — | ◇ UNVERIFIED |
| BIBethesda Iron Works, INC. | Rockville | MD | Fabricated Metal Product Manufacturing332323 | — | ◇ UNVERIFIED |
| BDBetz Dearborn INC | Ellicott City | MD | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BBBimbo Bakeries Usa, INC | Frederick | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| BDBioenergy Devco | Jessup | MD | Food Manufacturing311710 | — | ◇ UNVERIFIED |
| BABits and Bites Vending | Derwood | MD | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| BABlack Acres Roastery, LLC | Baltimore | MD | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| BHBlackball Holdings LLC | Reisterstown | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| BBBlack Briar Investments, LLC | North East | MD | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| BCBlack Classic Press, Inc. | Baltimore | MD | Printing and Related Support Activities323117 | — | ◇ UNVERIFIED |
| BCBlack Collar Screen Printing LLC | Baltimore | MD | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| BWBlackwell's Welding, INC. | Jessup | MD | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| BLBlk+grn, LLC | Upper Marlboro | MD | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| BHBlue Henry LLC | Upper Marlboro | MD | Food Manufacturing311930 | — | ◇ UNVERIFIED |
| BMBlue Mountain Woodworks INC | Hagerstown | MD | Furniture and Related Product Manufacturing337110 | — | ◇ UNVERIFIED |
 Boldmark Steel Industry, LLC | Baltimore | MD | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| BGBottling Group LLC | Williamsport | MD | Machinery Manufacturing333311 | — | ◇ UNVERIFIED |
| BWBoyd Wines, LLC | Savage | MD | Beverage and Tobacco Product Manufacturing312130 | — | ◇ UNVERIFIED |
| BEBraspek Enterprises LLC | Hyattsville | MD | Machinery Manufacturing333618 | — | ◇ UNVERIFIED |
| BABrass Artcrafts Company | Annapolis | MD | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| BABrass Artcrafts Company | Annapolis | MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| BCBread Corner Inc. | Rockville | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BCBrodley Construction L.L.C. | Potomac | MD | Wood Product Manufacturing321992 | — | ◇ UNVERIFIED |
| BBBrooks Barrel Company INC | Cambridge | MD | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| BSBrown Sugar Cake Company, LLC | Baltimore | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| BWBrown Welding Company | Laurel | MD | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| BSBs Seafood LLC | Waldorf | MD | Food Manufacturing311710 | — | ◇ UNVERIFIED |
