| Esperotia Energy Investments S.A. | |
| ESQRD | |
| Esri Polska | |
| ESTA S.C. | Silesian |
| Estey Sp. z o.o. | Masovian |
| eStrefa.pl | Lesser Poland |
| Esumo | |
| eTechnologie Sp. z o.o. | |
| eTermo-Inwest Sp. J. | Silesian |
| Etisoft Sp. z o.o. | |
| ETOS Sp. z o.o. | Warmian-Masurian |
| Euleo | |
| Eurobest.pl | Łódź |
| Eurobrand | |
| Euroimpex S.A. | Lower Silesian |
| European University of Information Technology and Economics in Warsaw | |
| Europejska Uczelnia Społeczno-Techniczna im. Roberta Schumana | |
| Europejska Uczelnia w Warszawie | |
| Europejska Wyższa Szkoła Prawa i Administracji | |
| Europejskie Regionalne Centrum Ekohydrologii Polskiej Akademii Nauk | |
| EuroSoft | |
| Euvic S.A. | |
| Evatronix S.A. | Silesian |
| EVE Sp. z o.o. | Masovian |
| Evenea Sp. z o.o. | Masovian |
| Eventory | |
| Eversoft Poland Sp. z o.o. | Masovian |
| Evertop | |
| Everuptive Sp. z o.o. | |
| Evestra Onkologia | |
| Evestra Onkologia Sp. z o.o. | |
| Evide | Masovian |
| EVR-Systems | Lower Silesian |
| eWIPO | Masovian |
| EWITRYNA Sp. J. | Łódź |
| Ewosoft | Lesser Poland |
| EWPOL Automatyka Przemysłowa | Lower Silesian |
| Exaco Sp. z o.o. | |
| Exago Media | |
| Exanet Sp. z o.o. Sp. k. | Greater Poland |
| eXant Software Polska Sp. z o.o. | Greater Poland |
| EXATEL, S.A. | Masovian |
| EXCOM Breza Hanna | Kuyavian-Pomeranian |
| Execon | |
| Exeon | |
| EXEQ Sp. z o.o. Sp. k. | |
| Exeria | |
| Existek | |
| EXMO Poland Sp. z o.o. | |
| Exnit Sp. z o.o. | Lesser Poland |