| Serware Info Kft. | Budapest |
| SessionBox | |
| Seven Digits Media, Inc. | |
| Shapr3D Zrt. | |
| Shop-Script | Budapest |
| Shopguard Kft. | Budapest |
| Sigmanet Kft. | Budapest |
| Silhouette Consulting Kft. | |
| Silicium | Budapest |
| Silihost Kft. | Komárom-Esztergom |
| Simplesoft Kft. | |
| Sinus-Networks Kft. | |
| Sixide Kft. | |
| Slot Consulting Ltd | |
| Smapp Lab | |
| Smart Charging Kft. | |
| SmartB2B | Budapest |
| SmartCommerce Digital Consulting Kft. | |
| Smartfront Kft. | |
| SMARTme Building Technologies Kft. | |
| Smartsector | Budapest |
| SMP Számítástechnikai Kft. | Budapest |
| SnapSoft | |
| Soft Consulting Hungary Zrt. | Budapest |
| Soft Flow Ltd | |
| Softholding Kft. | Budapest |
| Solus Capital | |
| Solvo Biotechnology | |
| Somitec Hungary Kft. | Borsod-Abaúj-Zemplén |
| Soproni Egyetem | |
| Speed Computer Kft. | Budapest |
| Spiderhost.hu | Baranya |
| Spring Interactive | Budapest |
| SRG Group Kft. | Budapest |
| Star Network | |
| Starschema Ltd | |
| Starsoft Bt. | Budapest |
| Start it @K&H | |
| Startup Budapest | Budapest |
| Startup Campus | Budapest |
| Startup Campus Incubator | |
| Startup Europe Network | Budapest |
| Startup Hungary | |
| StartUP! Magazin | |
| StartÜzlet | Budapest |
| Stockfresh.com Kft. | Budapest |
| STRT Holding Nyrt. | |
| Studio1 Startup Factory | Budapest |
| Studio10 | Budapest |
| Stylehub Ecommerce Kft. | |