| SiteBoX | Gironde |
| Sitec | Corse-du-Sud |
| Siteflow | |
| Siteparc | Paris |
| Sitepenalise.fr | |
| Sitescom | Oise |
| SiteW | |
| Siteweb65 | Hautes-Pyrénées |
| SiteWebPro | Métropole de Lyon |
| Sitodi | Bouches-du-Rhône |
| Sitowie | |
| SITSI | Hauts-de-Seine |
| Situaction | Nord |
| Sitweb concept | Bouches-du-Rhône |
| Siveco Group S.A. | Yvelines |
| SiVIEW | |
| SiWeb | Bouches-du-Rhône |
| SIWI | Paris |
| Six Design | Gironde |
| Six-Axe | Yvelines |
| Skaleet | |
| Skama | |
| Skapánê | |
| Skeepers | |
| Skello | Val-de-Marne |
| Skello | |
| SKEMA Business School | |
| Sketchfab | Paris |
| Skill Software | Hauts-de-Seine |
| Skilld S.A.S. | |
| Skills | |
| Skilmi | |
| SKOD | |
| Skopeo | |
| Skyepharma Production S.A.S. | |
| Skytech S.A.S. | |
| Slagon | Paris |
| Slapdigital | Paris |
| SLIB | Paris |
| SLICE | Nord |
| Slide Informatique | Var |
| SlidePro | |
| Slidor | |
| SlimPay | Paris |
| Slite | |
| Slumberland | |
| Smaaart | |
| SMAG | Marne |
| Small.paris | |
| Smart Agence | Paris |