| Duality S.A. | |
| DuckApp | |
| DUG.net.pl | Masovian |
| dwakroki.com | Pomeranian |
| Dyamik.pl | Masovian |
| Dynamic Solutions Sp. z o.o. Sp. k. | Podlaskie |
| Dyvenia | |
| Dziubinski | Masovian |
| e-BI Sp. z o.o. | |
| e-com.house | Masovian |
| E-commerce Capitals Sp. z o.o. Sp. k. | |
| E-Computer.pl | |
| E-Contenta | Masovian |
| E-mage | Masovian |
| e-marka.pl | Lesser Poland |
| E-marketing.pl | West Pomeranian |
| e-mo.pl | Silesian |
| e-MSI Sp. z o.o. | |
| E-Plus | Greater Poland |
| e-point S.A. | |
| e-service Sp. z o.o. | Subcarpathian |
| e-solution | Łódź |
| E-TECH S.C. | Łódź |
| e-walk.pl | Pomeranian |
| e-Webline | Lesser Poland |
| e-Weblink | Silesian |
| e.pl | Lesser Poland |
| E1-Interactive | Greater Poland |
| E2 Agencja Kreatywna | Lower Silesian |
| e24cloud.com | Greater Poland |
| EACTIVE | Lower Silesian |
| EARP Integration | |
| EastHORN | |
| EasyCall | Masovian |
| easyISP.pl | Pomeranian |
| Ebicom | |
| EBM Systemy Biurowe | Lower Silesian |
| EBRIT Sp. z o.o. | |
| eBroker.pl | |
| EC2 S.A. | Masovian |
| ECC Games S.A. | |
| Ecce | |
| Ecclesia Software Polska | Subcarpathian |
| Ecenter S.A. | Kuyavian-Pomeranian |
| ECLSOFT | Silesian |
| Ecolife Sp. z o.o. | |
| Ecom Sp. z o.o. | Kuyavian-Pomeranian |
| Econocap | Lower Silesian |
| eConsulting | |
| eConsulting | |