| Security Magazine | Michigan |
| Security Mentor, Inc. | California |
| Security Metrics | Utah |
| Security Onion Solutions, LLC | |
| Security Snobs | |
| Security University | Virginia |
| Security Vault Works, Inc. | Maryland |
| Security, Solutions, Services, LLC | Michigan |
| SecurityCEU.com | Kentucky |
| SecurityGate.io | Texas |
| SecurityPal | California |
| SecurityScorecard | New York |
| SecurityTrails | California |
| SecurityWeek | |
| Securonix | Texas |
| Securosis, LLC | Arizona |
| Securus Technologies, Inc. | Texas |
| Sedai, Inc. | |
| Sedara | New York |
| SEDC | Georgia |
| Sedec Therapeutics | |
| Sedia Biosciences Corporation | Oregon |
| Sedna Solutions, Inc. | California |
| Sedo.com, LLC | Massachusetts |
| Sedona Corporation | Pennsylvania |
| Sedona Technologies | |
| SEE Global Entertainment | California |
| SeeClickFix, Inc. | Connecticut |
| Seed Angel Forum | Colorado |
| Seed Biotech, Inc. | |
| Seed Factory | |
| Seed Health | California |
| Seed Health, Inc. | California |
| Seed Innovations, LLC | |
| Seed Logic, LLC | |
| Seed Round Capital, LLC | Texas |
| Seed Startup House | Connecticut |
| Seed Startup House, LLC | |
| Seed Technologies, Inc. | |
| SEED Therapeutics, Inc. | |
| Seed-DB | New York |
| SeedCart | |
| Seedinov Technologies | |
| SeedInvest Technology, LLC | New York |
| Seedling Studio | |
| Seeds Marketing+Design | |
| Seeds Software | California |
| Seedsprint | |
| SeedStep Angels | Oklahoma |
| SeedtoB Capital | Georgia |