| Company name | Reg. code |
|---|---|
| HEIS OÜ | 10007687 |
| HEISI IT OÜ | 12765966 |
| HEISI TEENUSED OÜ kustutatud | 16056793 |
| HEIST RECRUITMENT OÜ kustutatud | 16368972 |
| HEIN & HEIN OÜ | 14553346 |
| HEIP OÜ | 14970512 |
| HEIM OÜ | 12200112 |
| HEII OÜ | 14896879 |
| HEIN OÜ | 14550483 |
| HEID CREATIVE OÜ | 16777305 |
| SV-HEISI OÜ | 11436982 |
| NORDIC HEIM OÜ (former name Frida Turg OÜ) | 12124173 |
| HEINS TRANSPORT OÜ | 11875575 |
| HEIX EHITUS OÜ kustutatud | 11746984 |
| HEIX24H OÜ | 12082173 |
| HEI NABO OÜ | 17281351 |
| HEI APRILL OÜ | 17325321 |
| HEI PRODUCTIONS OÜ | 16336666 |
| WEIMEROIL OÜ kustutatud (former name Hein Lakka OÜ) | 12878498 |
| HEISIL OÜ | 12516358 |
| HEISAR OÜ | 16467533 |
| HEISLIE OÜ | 14829943 |
| HEISTAR OÜ | 11135482 |
| MAROTOR METS OÜ kustutatud (former name HEI Kapital OÜ) | 11465392 |
| RUPIT CONSULTING OÜ (former name Perez Heit & Asociados OÜ) | 14878893 |
| HEISTAJA OÜ kustutatud | 14192397 |
| HEISKONEN OÜ | 11619889 |
| HEISTERIS OÜ kustutatud | 10187715 |
| HEISTER AN OÜ | 11112593 |
| HEISENBUG OÜ | 14980060 |
| HEISENCODE OÜ | 17319728 |
| HEISAF GRUPP OÜ (former name Brandcrew OÜ) | 12824427 |
| AATOM PROJEKT OÜ (former name A-HEIB OÜ) | 14422667 |
| HEISAN TEENUSED OÜ | 16964160 |
| STUDIO HEISENBERG OÜ | 14565208 |
| HEISER GOODS & SERVICES OÜ | 12536409 |
| HEISENBERG EHRMANTRAUT OÜ | 12791691 |
| DEIS OÜ | 16501135 |
| HIIS OÜ | 17175531 |
| HERIS OÜ (former name Quaestor OÜ) | 14387735 |
| SEIS OÜ | 14990526 |
| LEIS OÜ | 14705224 |
| HES OÜ | 16481326 |
| HIS OÜ kustutatud | 10386288 |
| MEDICALSERVICES EUROPE HEISER OÜ kustutatud | 16126370 |
| HEES MANAGEMENT OÜ | 16672285 |
| INDREKS REIS OÜ | 10395867 |
| HECS DEVELOPMENT OÜ (former name Arvatti OÜ) | 16827244 |
| TIMMI VEIS OÜ | 12149753 |
| VEELIKSE VEIS OÜ | 14095257 |