| Build4Sim, Inc. | |
| Build5Nines, LLC | |
| Buildbox | California |
| Builder Consulting Internet Experts | Missouri |
| Builder Prime | New York |
| Builder Websites | Minnesota |
| Builder.io, Inc. | California |
| Builders | California |
| BuilderWire, Inc. | Massachusetts |
| Buildfire | |
| Buildforce, Inc. | |
| Building a Second Brain | |
| Building Conversation | |
| Building Engines | Massachusetts |
| Building Intelligence, Inc. | |
| Building Knowledge Systems, LLC | |
| Building Robotics, Inc. | California |
| Building Technology, Inc. | |
| Building Ventures | Massachusetts |
| Building Your Drone Business | |
| BuildingOnline, Inc. | Florida |
| Buildium, LLC | Massachusetts |
| Buildonline | |
| Buildout | Illinois |
| BuildScience, Inc. | California |
| Buildtelligence | Florida |
| BuildWithin | District of Columbia |
| BuildYourSite, Inc. | California |
| Buildz.io | |
| Built Best | |
| Built for Teams | Utah |
| Built In | Illinois |
| Built in Auscin | Texas |
| Built in Boston | Massachusetts |
| Built In Chicago | Illinois |
| Built in Colorado | Colorado |
| Built in NYC | New York |
| Built inf Los Angeles | California |
| Built Mighty | |
| Built Robotics, Inc. | |
| Built Technologies, Inc. | Tennessee |
| BuiltBy, LLC | |
| Bulder Trend | Nebraska |
| Bull City Venture Partners | North Carolina |
| Bulldog Creative Services | |
| Bulldog Digital Media | |
| Bulldog IT | Michigan |
| BullerTech | |
| bulletlink.com | Texas |
| Bullfinch | |