| Deltabit | Pirkanmaa |
| Deltasoft Mobile, Inc. | Uusimaa |
| Desentum | |
| Desentum Oy | |
| Deskartes Oy | Uusimaa |
| Detection Technology Oyj | Uusimaa |
| Devaten | |
| devChallenges | |
| Devea Software Oy | |
| Devolon | |
| Dicode Oy | |
| Digia Oyj | Uusimaa |
| Digita Oy | Uusimaa |
| Digital Flask | Uusimaa |
| Digitalist Group | |
| Digitase Oy | |
| Disior Ltd | |
| Dispelix | |
| Distence Oy | |
| Dixu | |
| DNA Oy | Uusimaa |
| Domainhotelli Oy | Southwest Finland |
| Domainkeskus | Southwest Finland |
| Doventus Oy | |
| e-Oppi | |
| Easylinehost | Northern Savonia |
| Education Finland | |
| EduCluster Finland Ltd | |
| Edunation Oy | |
| eeedo oy | |
| Eficode | |
| EKE-Electronics Ltd | |
| Electronic Frontier Finland ry | Uusimaa |
| Elevator | |
| ElFys, Inc. | |
| Elisa Oyj | |
| Elisa Oyj | |
| eMabler | |
| EmblaCom | Uusimaa |
| EmCe Solution Partner Oy | Uusimaa |
| Emittor Oy | |
| Empirica Finland Oy | Southwest Finland |
| Enable Banking Oy | Uusimaa |
| Endev | |
| EnergySpin | |
| Eneron Oy | |
| Enersense International Oyj | |
| Enfuce Financial Services Ltd | |
| Enhancell Ltd | |
| eniferBio | |