| Inofix GmbH | Lucerne |
| Inomass | Zurich |
| Inpeco S.A. | |
| Insiders.live S.A. | |
| Insightness AG | |
| insign GmbH | Zurich |
| Insolight | |
| inSolus | Geneva |
| Insomni'hack | |
| InSphero AG | |
| Institut et Haute École de la Santé La Source | |
| Institut für Software-Ergonomie und Usability | Zurich |
| Institut Straumann AG | |
| Institut Suisse d'Enseignement de l'Informatique de Gestion | Vaud |
| Institute for Mergers, Acquisitions & Alliances | |
| Intarsys (Schweiz) AG | Basel-Landschaft |
| INTEGRA Biosciences AG | |
| Integritee AG | |
| Intentis | |
| Inter-Ibex Consulting S.A. | Vaud |
| Inter-Networking AG | Zurich |
| Interactive MEDIA | Geneva |
| InterAx Biotech AG | |
| Interchain Foundation | |
| Interconnective AG | Basel-Stadt |
| Interdiscount | Bern |
| interfaSys S.à.r.l. | Vaud |
| Interkantonale Hochschule für Heilpädagogik | Zurich |
| International Academy of Sport Science & Technology | |
| International Institute for Management Development | |
| International Management Institute Switzerland Ltd | |
| International Society for Telemedicine & eHealth | Basel-Stadt |
| International Space Science Institute | Bern |
| International Standard Organization | Geneva |
| International Trade Centre | |
| International University in Geneva | Geneva |
| Internet Diffusion S.à.r.l. | Geneva |
| Internet Governance Forum | Geneva |
| Internet Services Häni | Fribourg |
| Internet-projects.com | Zurich |
| Internet.ch IT AG | Zurich |
| Internet4you.ch GmbH | Basel-Landschaft |
| Internetgalerie AG | Bern |
| internetGrafik.com | Zurich |
| Internex | Neuchâtel |
| Internezzo AG | Zug |
| Interprefy | |
| Intersim AG | Bern |
| InterTell | Lucerne |
| Interventure Sourcing AG | Zurich |