| MEMartinelli Environmental Graphics | San Francisco | CA | Beverage and Tobacco Product Manufacturing312230 | — | ◇ UNVERIFIED |
| MSMartinez Steel | San Francisco | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMartin Sign Co., INC. | San Francisco | CA | Textile Mills313310 | — | ◇ UNVERIFIED |
| MAMasterpice Artist Canvas | San Francisco | CA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| MHMatthew Hayes | San Francisco | CA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| MCMexico City Iron Works | San Francisco | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| MSMeyers Sheet Metal Box, INC | San Francisco | CA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |
| MFM. Flower Garment, INC. | San Francisco | CA | Apparel Manufacturing315239 | — | ◇ UNVERIFIED |
| MRMichael Recchiuti | San Francisco | CA | Food Manufacturing311352 | — | ◇ UNVERIFIED |
| MBMicro-tracers,inc Building #1 | San Francisco | CA | Food Manufacturing311119 | — | ◇ UNVERIFIED |
| MTMirada Technologies INC | San Francisco | CA | Machinery Manufacturing333314 | — | ◇ UNVERIFIED |
| MMMiss Moon Pb Bakery INC Dba Paris Baguette | San Francisco | CA | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| MEMitsubishi Electric | San Francisco | CA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| MEMitsubishi Electric | San Francisco | CA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| MLModdler LLC | San Francisco | CA | Furniture and Related Product Manufacturing337215 | — | ◇ UNVERIFIED |
| MFModern Family Dental | San Francisco | CA | Miscellaneous Manufacturing339114 | — | ◇ UNVERIFIED |
| MLMultiply Labs INC | San Francisco | CA | Transportation Equipment Manufacturing336390 | — | ◇ UNVERIFIED |
| NDNanu Design Inc. | San Francisco | CA | Electrical Equipment, Appliance & Component Manufacturing335999 | — | ◇ UNVERIFIED |
| NNeil | San Francisco | CA | Plastics and Rubber Products Manufacturing326199 | — | ◇ UNVERIFIED |
| NTNektar Therapeutics | San Francisco | CA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| NHNew Hung Yee Sewing, INC. Dba New Hung Sewing CO. | San Francisco | CA | Apparel Manufacturing315299 | — | ◇ UNVERIFIED |
| NFNicholson Fabrication | San Francisco | CA | Fabricated Metal Product Manufacturing332510 | — | ◇ UNVERIFIED |
| NWNikolas Weinstein Studios INC. | San Francisco | CA | Nonmetallic Mineral Product Manufacturing327215 | — | ◇ UNVERIFIED |
| NLNima Labs, INC | San Francisco | CA | Miscellaneous Manufacturing339999 | — | ◇ UNVERIFIED |
| NENina Eckhoff | San Francisco | CA | Petroleum and Coal Products Manufacturing324191 | — | ◇ UNVERIFIED |
| NINitricity INC | San Francisco | CA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| NVNoe Valley Bakery and Bread Company | San Francisco | CA | Food Manufacturing311811 | — | ◇ UNVERIFIED |
| NVNoe Valley Coffee CO | San Francisco | CA | Food Manufacturing311920 | — | ◇ UNVERIFIED |
| NONokia of American Corporation | San Francisco | CA | Computer and Electronic Product Manufacturing334418 | — | ◇ UNVERIFIED |
| NCNorth Coast Steel | San Francisco | CA | Fabricated Metal Product Manufacturing332322 | — | ◇ UNVERIFIED |
| NDNotre Dame Plaza, Dba: Notre Dame Senior Plaza | San Francisco | CA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| NCNueva Castilla Iron Works, INC. | San Francisco | CA | Fabricated Metal Product Manufacturing332312 | — | ◇ UNVERIFIED |
| NNumerai | San Francisco | CA | Transportation Equipment Manufacturing336992 | — | ◇ UNVERIFIED |
| OCOakes Children's Center | San Francisco | CA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| ODOberon Design | San Francisco | CA | Textile Product Mills314120 | — | ◇ UNVERIFIED |
| OSOcean Sash & Door INC | San Francisco | CA | Wood Product Manufacturing321911 | — | ◇ UNVERIFIED |
| OGOctagon Graphics INC | San Francisco | CA | Printing and Related Support Activities323122 | — | ◇ UNVERIFIED |
| OIOhio INC | San Francisco | CA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| OBOlivier's Butchery | San Francisco | CA | Food Manufacturing311612 | — | ◇ UNVERIFIED |
| OHOne Hat One Hand LLC | San Francisco | CA | Leather and Allied Product Manufacturing316110 | — | ◇ UNVERIFIED |
| OIO'neill INC | San Francisco | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| OROne Rincon Hill Association | San Francisco | CA | Textile Mills313310 | — | ◇ UNVERIFIED |
| OPOriginal Pattern, Inc. | San Francisco | CA | Beverage and Tobacco Product Manufacturing312120 | — | ◇ UNVERIFIED |
| OGOsterhout Group INC Dba Osterhout Design Group | San Francisco | CA | Computer and Electronic Product Manufacturing334111 | — | ◇ UNVERIFIED |
| OEOtis Elevator Company | San Francisco | CA | Machinery Manufacturing333921 | — | ◇ UNVERIFIED |
| OBOyster Bed Sleep Shop | San Francisco | CA | Furniture and Related Product Manufacturing337122 | — | ◇ UNVERIFIED |
| PCPacific Cement CORP | San Francisco | CA | Nonmetallic Mineral Product Manufacturing327320 | — | ◇ UNVERIFIED |
| POPacific Oral and Maxillofacial Surgery Center | San Francisco | CA | Miscellaneous Manufacturing339113 | — | ◇ UNVERIFIED |
| PRPage Rockwell | San Francisco | CA | Nonmetallic Mineral Product Manufacturing327999 | — | ◇ UNVERIFIED |
| PSPan-glo Services INC | San Francisco | CA | Fabricated Metal Product Manufacturing332812 | — | ◇ UNVERIFIED |