| S.C. Saratoga S.R.L. | Timiș |
| S.C. Sign Portal S.R.L. | Arad |
| S.C. Simplu Credit IFN S.A. | |
| S.C. Smart Web Concept S.R.L. | Bucharest |
| S.C. SocialBee Labs S.R.L. | |
| S.C. Software Pop Service Electronic S.R.L. | Dolj |
| S.C. Sparkweb Solutions S.R.L. | |
| S.C. Tedall Corp S.R.L. | Dolj |
| S.C. TFM Group Software S.R.L. | Bucharest |
| S.C. Trustnet Solutions S.R.L. | Alba |
| S.C. Uncle Sam S.R.L. | Vâlcea |
| S.C. Unick International S.R.L. | Ilfov |
| S.C. UniSoft S.R.L. | Mureș |
| S.C. uniTECH Computer S.R.L. | Hunedoara |
| S.C. Verticas S.R.L. | Arad |
| S.C. Virtual Reality S.R.L. | |
| S.C. Visual Fan S.A. | |
| S.C. WalletBuzz S.R.L. | Bucharest |
| S.C. Webeff Intl S.R.L. | Arad |
| S.C. Wiz Soft S.R.L. | Brașov |
| S.I.E.B. Software | Bucharest |
| Safetech Innovations S.A. | |
| Sag Media Communications | |
| Salarium Fintech S.R.L. | |
| Salt & Pepper | |
| San Software S.R.L. | Bucharest |
| Sannet | Suceava |
| Sapientia Erdélyi Magyar Tudományegyetem | |
| Satura Computers S.R.L. | Arad |
| SBP | Bucharest |
| Scanrom Copiers S.R.L. | Bucharest |
| SCI Programming | |
| Școala informală de IT | |
| Școala Naţională de Studii Politice și Administrative | |
| Scop Computers | Bucharest |
| Scribsoftware S.R.L. | |
| Scriptics Decisions S.R.L. | Sibiu |
| SDG Webs | Bihor |
| Search Engine Optimization Europe Agency | Bucharest |
| SecurifAI | |
| Sedona Alm S.R.L. | Bucharest |
| SeedBlink Crowd S.A. | |
| Sekpsis Consult S.R.L. | Bucharest |
| Select IT | |
| SenDesign Development S.R.L. | |
| SendTo eXpert S.R.L. | Galați |
| Senior Software | Bucharest |
| SeniorERP | Bucharest |
| Sense Vision Consulting | |
| Sensidev | |