| Potail luxembourgeois de l'innovation et de la recherche | Esch-sur-Alzette |
| Primafin Luxembourg S.A. | Capellen |
| Privilège Ventures S.A. | |
| ProNewTech S.A. | |
| ProSolut S.A. | |
| Prowide Software | Capellen |
| Proximus Luxembourg | |
| QiuBits | Remich |
| Quality Electronics Design S.A. | |
| Ramirez Electro S.A. | Esch-sur-Alzette |
| Randstad Interim S.A. | |
| RazrTech | |
| Rcarré S.A. | Capellen |
| RCDevs S.A. | Esch-sur-Alzette |
| RealCorp | |
| Reborn | |
| Red Dog Communications | Luxembourg |
| Référenceur | |
| Regus | |
| Research Industry Collaboration | |
| Research Luxembourg | |
| RespectUs | |
| Ricoh Luxembourg PSF S.à.r.l. | Luxembourg |
| Romain Petges | |
| RoomMate S.A. | |
| Root S.A. | Mersch |
| Rotarex | |
| RSS-Hydro | |
| RTC4Water | |
| Runa Capital | |
| Sacred Heart University Luxembourg | |
| Santé Services | |
| Satgana | |
| Satispay Europe S.A. | Luxembourg |
| Saturne Technology | |
| Savvy Mobility | |
| SBM Luxembourg | Capellen |
| Schaller Electronic S.à.r.l. | Luxembourg |
| SEA-Invest | |
| SeeReal Technologies S.A. | |
| Sera Solutions S.à.r.l-s | |
| SES S.A. | Grevenmacher |
| SFR Luxembourg | Luxembourg |
| Shipsta S.à r.l. | |
| ShortDot | Luxembourg |
| Silicon DNA | Luxembourg |
| Silicon Luxembourg | Luxembourg |
| Simdle | |
| Simile Venture Partners | Luxembourg |
| simpleshow | |