| ECLSOFT | Silesian |
| Ecolife Sp. z o.o. | |
| Ecom Sp. z o.o. | Kuyavian-Pomeranian |
| Econocap | Lower Silesian |
| eConsulting | |
| EcoTech Sp. z o.o. Sp. k. | |
| Ecreo | Greater Poland |
| ECRU Software | Lesser Poland |
| EDO Dariusz Szwedo | Opole |
| eDoktor24.pl | |
| edrone | |
| EdTechHub Ventures | |
| Edward | Lesser Poland |
| EEC Ventures | |
| eForensics Magazine | Masovian |
| eGabinet | |
| eHost.pl Sp. z o.o. | Lublin |
| EJR Sp. z o.o. | Silesian |
| Eko-Sort | Silesian |
| Ekobilet S.A. | |
| El-net | West Pomeranian |
| EL-TEC Sp. z o.o. | Łódź |
| eLang | |
| Elektromont S.A. | |
| Elektronika Sp. z o.o. | Masovian |
| ElektronikaB2B | Masovian |
| Elektropek | Podlaskie |
| Elektrozłom Sp. z o.o. | Silesian |
| Element Sp. z o.o. S.K.A. | |
| Elevato S.A. | |
| Elewatorsoft.pl Sp. z o.o. | Greater Poland |
| Elinext | |
| Elmark Automatyka S.A. | Masovian |
| Elmodis | Lesser Poland |
| ELNEX | Masovian |
| ELPRO-Bis Sp. z o.o. | Greater Poland |
| Elprojekt Sp. z o.o. | Łódź |
| Elprosys Sp. z o.o. | |
| ELZET | Lower Silesian |
| EmailLabs | |
| Emapa | Łódź |
| Emarketing Experts | Masovian |
| EMC Group | Lesser Poland |
| EMC Instytut Medyczny S.A. | |
| EMIT Sp. z o.o. | Lower Silesian |
| Emiter Sp. z o.o. | Silesian |
| Empirica | Lower Silesian |
| Emplo | |
| EMS Partner | |
| ENAP S.A. | Masovian |