- Dagsmark Petfood
- DataCrunch
- Dataridoo
- Dazzle Rocks
- Deal Room Events
- Dealsign Solutions Oy
- Dear Lucy
- DeepScan Diagnostics
- Deep Scan Tech
- Deep Sensing Algorithms
- Dentafit
- Dermeco
- DeskMe
- Devea Software
- Dexmen
- Diafree
- DiagFactor
- Diamondtrap
- DieNo Games
- Digital Minds
- Digital Workforce
- Digizen
- DineAway
- Dipsy
- Dispelix
- Distillery Ägräs
- Dobbelgänger
- Docue
- Doerz
- Do Good Brew co.
- Dolea
- Done Technologies Oy
- Dooap
- Douplepoint
- Dreamloop Games
- Droppe
- Druid.ai
- Duara Travels
- DustComb