| Grosvenor Technology | Florida |
| Grotech Ventures | Virginia |
| Groth Co, LLC | |
| Grōu Digital, LLC | |
| Ground Support Equipment (U.S.) Ltd | New York |
| Ground Zero Pharmaceuticals | |
| Groundbreaking Studios, LLC | |
| GroundCloud | Minnesota |
| Groundhog Technologies, Inc. | Massachusetts |
| Grounds for Promotion, LLC | |
| Groundspeak, Inc. | |
| Groundspeed | Michigan |
| Groundswell | |
| GroundwaterSoftware | Massachusetts |
| GroundWork, Inc. | California |
| Group 2, Inc. | |
| Group 3 Solutions | |
| Group 47, Inc. | |
| Group of 30 | |
| Group President Electronics | Florida |
| Group11 | |
| Group14 Technologies | Washington |
| Group6, LLC | |
| Groupable | |
| GroupBWT, LLC | |
| GroupHub, Inc. | |
| GroupLink | Utah |
| GroupM | |
| GroupM7 Design | Texas |
| Groupon, Inc. | |
| Groups.io, Inc. | |
| GroupSense | Virginia |
| Groupsite.com, Inc. | California |
| Groupsoft | New York |
| GroupSoft Systems, Inc. | Massachusetts |
| GroupTweet | Ohio |
| Grouse Ridge Capital, LLC | |
| Grove Biopharma | |
| Grove City College | Pennsylvania |
| Grovemade | Oregon |
| Grover Web Design, LLC | |
| GroveSite | Arizona |
| GroveStreet | Massachusetts |
| Grow | Utah |
| Grow Communication | Colorado |
| Grow Credit, Inc. | |
| Grow Forward JP, Inc. | |
| Grow VC Operations Ltd | New York |
| Grow with Google | California |
| GrowaRock | California |