| SLSafesource LLC Ta Chemguard Products | Ijamsville | MD | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| SSSage Screenprinting, Inc. | Baltimore | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SSSailing Specialty Partners, INC. | Hollywood | MD | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| SSalisbury | Salisbury | MD | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| SDSazerac Distiller, LLC Db/a Iron Bull Distilert | Halethorpe | MD | Beverage and Tobacco Product Manufacturing312140 | — | ◇ UNVERIFIED |
| SBSchimdt Baking Company, Incorporated | Baltimore | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SASchmell Azman Bakery | Baltimore | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SAScience Applications International Corporation | Columbia | MD | Computer and Electronic Product Manufacturing334290 | — | ◇ UNVERIFIED |
| SPSecurity Plating CO INC | Baltimore | MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SHSeiler Hughes | Baltimore City | MD | Fabricated Metal Product Manufacturing332813 | — | ◇ UNVERIFIED |
| SCSerigraphics Company, INC. | Baltimore | MD | Printing and Related Support Activities323119 | — | ◇ UNVERIFIED |
| SFS.e.w. Friel LLP | Wye Mills | MD | Food Manufacturing311421 | — | ◇ UNVERIFIED |
| SFSfa Frederick Manufacturing | Frederick | MD | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| SGS - G Concrete Company, Llc- Grantley Ave. Plant | Baltimore | MD | Nonmetallic Mineral Product Manufacturing327390 | — | ◇ UNVERIFIED |
| SSShimadzu Scientific Instruments | Columbia | MD | Computer and Electronic Product Manufacturing334516 | — | ◇ UNVERIFIED |
| SPShockley Pallet Company | Snow Hill | MD | Wood Product Manufacturing321920 | — | ◇ UNVERIFIED |
| SNSierra Nevada CORP Ims Hangar 66 | Hagerstown | MD | Transportation Equipment Manufacturing336411 | — | ◇ UNVERIFIED |
| SESignal Edge Solutions LLC | Glen Burnie | MD | Computer and Electronic Product Manufacturing334515 | — | ◇ UNVERIFIED |
| SSignarama | Gaithersburg | MD | Printing and Related Support Activities323113 | — | ◇ UNVERIFIED |
| SNSigns Now | Essex | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| STSilver Top Manufacturing CO INC | White Marsh | MD | Machinery Manufacturing333319 | — | ◇ UNVERIFIED |
| SSSimpson Strong-tie Company, INC. | Baltimore | MD | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| SSSir Speedy Bwi | Linthicum | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SHSlr Holdings, INC. | Silver Spring | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SASmith and Nephew, INC | Columbia | MD | Chemical Manufacturing325414 | — | ◇ UNVERIFIED |
| SHSmith Hosiery Northeast INC | Beltsville | MD | Apparel Manufacturing315120 | — | ◇ UNVERIFIED |
| SFSnavely Forest Products Company | Westminster | MD | Wood Product Manufacturing321912 | — | ◇ UNVERIFIED |
| SMSnelson Media Inc | Rockville | MD | Printing and Related Support Activities323111 | — | ◇ UNVERIFIED |
| SCSoKat Consulting LLC | Woodstock | MD | Computer and Electronic Product Manufacturing334112 | — | ◇ UNVERIFIED |
| SISolar4pools INC | Sykesville | MD | Machinery Manufacturing333414 | — | ◇ UNVERIFIED |
| SSSol Signs & Graphics INC. | Columbia | MD | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
| SSSomething Sweet by Jessi Inc | Fort Washington | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| SWSonco Worldwide INC | Bladensburg | MD | Fabricated Metal Product Manufacturing332618 | — | ◇ UNVERIFIED |
| SCSouthern Connection Seafood, INC. | Crisfield | MD | Food Manufacturing311710 | — | ◇ UNVERIFIED |
| SPSouthern Pacific Supply Co., INC. | Jessup | MD | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| SPSpectrum Printing | Rockville | MD | Printing and Related Support Activities323110 | — | ◇ UNVERIFIED |
| SCSpirent Communications | Gaithersburg | MD | Computer and Electronic Product Manufacturing334515 | — | ◇ UNVERIFIED |
| SCStanco Corporation | Baltimore | MD | Wood Product Manufacturing321918 | — | ◇ UNVERIFIED |
| SLStarbus LTD | Annapolis | MD | Apparel Manufacturing315228 | — | ◇ UNVERIFIED |
| SCStevenson & CO | Baltimore | MD | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| SRStevo's Reclaimed | Mount Airy | MD | Wood Product Manufacturing321114 | — | ◇ UNVERIFIED |
| SAStulz Air Technology Systems INC | Frederick | MD | Machinery Manufacturing333415 | — | ◇ UNVERIFIED |
| SISumatech, INC. | White Marsh | MD | Fabricated Metal Product Manufacturing332710 | — | ◇ UNVERIFIED |
| SBSunflower Bakeries, LLC | Rockville | MD | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| SISunny In Denbigh LLC | Frederick | MD | Chemical Manufacturing325620 | — | ◇ UNVERIFIED |
| SSSun Sign and Print LLC | Bethesda | MD | Miscellaneous Manufacturing339950 | — | ◇ UNVERIFIED |
 Super Sky Products Enterprises, LLC | Timonium | MD | Fabricated Metal Product Manufacturing332321 | — | ◇ UNVERIFIED |
| SISwave, INC | Baltimore | MD | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| SASweet Almond, LLC | Hughesville | MD | Food Manufacturing311812 | — | ◇ UNVERIFIED |
| SLSwitch Ledpro LLC | Upper Marlboro | MD | Computer and Electronic Product Manufacturing334310 | — | ◇ UNVERIFIED |
