| Gibbes | |
| Gibbs Design | |
| Gibraltar Software, Inc. | Maryland |
| Gibson Computer Associates | Colorado |
| Gibson Engineering Company, Inc. | Massachusetts |
| Gibson Oncology | |
| Gibson Research Corporation | California |
| Gibson Technical Services, Inc. | Georgia |
| GID Bio | Colorado |
| Gidel | California |
| Gideon Brothers (USA), Inc. | Delaware |
| Gierd | |
| Gifted Design Lab | |
| Giga Creatives, Inc. | |
| Giga-tronics, Inc. | California |
| Gigabark, LLC | |
| Gigabit | |
| Gigablast | New Mexico |
| GigaGen, Inc. | California |
| Gigahertz-Optik, Inc. | Massachusetts |
| GigaMat Technologies | California |
| Gigamon, Inc. | California |
| GigaMune | California |
| GigaNet Systems, Inc. | Texas |
| Gigantic, LLC | |
| Gigantor Technologies. Inc. | |
| GigaOm | Texas |
| GigaParts, Inc. | Alabama |
| Gigaram, Inc. | California |
| Gigasheet | |
| Gigasoft Development, Inc. | Illinois |
| Gigasoft, Inc. | Texas |
| GigaSpaces | New York |
| GigaStar | Illinois |
| GigaWatt, Inc. | |
| GigaWave Technologies | Texas |
| Gigenet | Illinois |
| GigeNET Cloud | Illinois |
| Giggr Technologies, Inc. | Delaware |
| GigLabs | Georgia |
| Gigmor | |
| Gigs | California |
| GigSafe | |
| GigSmart | |
| GigSocial, Inc. | |
| Gigster, Inc. | California |
| GiGstreem | |
| Gigwalk | California |
| Gigwell | California |
| Gila Therapeutics | |