| HackenProof, Inc. | |
| Haiku | |
| HALA Digital OÜ | |
| Hangfire OÜ | |
| HansaBioMed Life Sciences Ltd | |
| HansaNet OÜ | Harju |
| HappyMe | |
| Hausing | Harju |
| Haut.AI | |
| Health Founders | |
| Hedgehog OÜ | |
| Heimdallr Smart Networks | |
| Helmes | Harju |
| Helsiko Pluss OÜ | Harju |
| Hepta Group Airborne Ltd | |
| Hepta Group Airborne Ltd | |
| Hepta Group Energy OÜ | |
| Hey Digital OÜ | |
| Hiface OÜ | |
| HiMasters | |
| Hinnavaatlus | Harju |
| Hosted Status Page | |
| HotelBuddy | |
| Hotspoter OÜ | |
| Hyebooster OÜ | |
| IBIK Software OÜ | |
| Icefire | Harju |
| ID Süsteemide AS | Harju |
| Idealogic | |
| Ignium | |
| Igor Maznitsa | Harju |
| Implica Global Corporation OÜ | |
| Incap Electronics Estonia OÜ | |
| Income Company OÜ | |
| Infonet AS | Harju |
| Informaatika ja Arvutustehnika Instituudi As | Harju |
| Infostar.ee | |
| Infotehnoloogia ja Telekommunikatsiooni Liit | Harju |
| InfraSoft OÜ | |
| Integra Games OÜ | Harju |
| Intellisoft | Tartu |
| Intense Health OÜ | |
| Interconnect Product Assembly AS | Harju |
| Interflux Eesti OÜ | Harju |
| Interframe OÜ | Harju |
| InToRingy OÜ | |
| Introduct | |
| Inversion Software OÜ | Harju |
| Invest in Estonia | |
| Iomob Technologies OÜ | |