| Ownr Wallet OÜ | |
| Oyko OÜ | |
| Parallel ideas OÜ | |
| Parasym Health | |
| Parsio | |
| Paul-Tech OÜ | |
| Paytailor | |
| Paytailor, LLC | |
| PayTraq | Harju |
| Paywerk AS | |
| Pedicel Marketing | |
| Peppernode OÜ | |
| Perel Eesti AS | |
| Perpetio | |
| Pessimistic Security | |
| Piksel OÜ | Harju |
| Planet.ee | Harju |
| Plausible Insights OÜ | |
| PlayJoy Studios | |
| Plumbr | Harju |
| Plummy Games | Harju |
| Positium | |
| Printerikskus | Harju |
| ProBit Global Services Ltd | |
| Producter | |
| Proekspert | Harju |
| ProMedia | Tartu |
| Proof Suite | |
| PROTEI | |
| Protobios | |
| Pwrteams | |
| QAwerk | Harju |
| QBRI OÜ | |
| Qoffer | |
| QR Menu | |
| Qualito OÜ | |
| Quantum Brain Research Institute | |
| Qubit Labs | |
| Quema | |
| Quibli Media | |
| Quppy | |
| Quppy Europe OU | Harju |
| Quretec OÜ | |
| R8 Technologies | |
| Rademade Technologies OÜ | |
| Radicenter | |
| Raison | Harju |
| Ralabs | |
| Rantelon OÜ | Harju |
| Rapo | Harju |