| Company name | Reg. code |
|---|---|
| HARATON OÜ | 17107601 |
| HARTON OÜ | 12424194 |
| HARDSTON OÜ | 14978146 |
| HARPTEN OÜ | 11322600 |
| HARELTON OÜ kustutatud | 10192845 |
| HARITTON OÜ | 16636421 |
| HARPAGON OÜ | 16497994 |
| HARMARON OÜ kustutatud | 10341529 |
| HARMOON OÜ | 12149612 |
| HARLEON OÜ | 14023217 |
| HARDTOP OÜ | 12584147 |
| FOREST K PRODUCTION OÜ (former name Hariton KA OÜ) | 16342464 |
| MARATON OÜ | 10166701 |
| HAATON OÜ | 16305256 |
| MARATON METS OÜ | 12800326 |
| TARTU MARATON OÜ | 10607140 |
| HARATU OÜ | 17172745 |
| HARCON OÜ | 16019237 |
| GALATON OÜ | 10792255 |
| CARSTON OÜ | 10261598 |
| KARETON OÜ kustutatud | 10794892 |
| HESATON OÜ | 11027605 |
| KERATON OÜ | 16950554 |
| ATRATON OÜ kustutatud | 10734743 |
| HORATOR OÜ | 11135306 |
| HAMPTON OÜ kustutatud (former name Hampton UÜ) | 14123947 |
| DERATON OÜ | 10584315 |
| BAIRATON OÜ | 16419669 |
| HABITON OÜ | 14470531 |
| HERATLON OÜ | 17131522 |
| JARETON OÜ (former name Harrycane OÜ) | 14422408 |
| DIRATON OÜ | 12984332 |
| CAVATON OÜ | 12583047 |
| HARON OÜ | 14185658 |
| HARTO OÜ (former name aktsiaselts Harto) | 10002170 |
| HARMON HOLDING OÜ | 11269194 |
| ABDULLAH HAROON OÜ (former name MOTORZ OÜ) | 12924407 |
| HARETO PÕLD OÜ kustutatud (former name OÜ Popsikurnu-Poriküla Põllud ja Metsad) | 10817297 |
| HARTEN TRANS OÜ | 12709531 |
| HARMON TRADE OÜ | 11221371 |
| HARLON INVEST OÜ (former name VUUL OÜ) | 14167040 |
| FARADON CONSULTING OÜ | 10526811 |
| HEKATON INVESTMENTS OÜ | 16512723 |
| GALATON BUSSID OÜ | 11050053 |
| GALATON REISID OÜ kustutatud | 11040882 |
| GALATON TOUR OÜ | 11448790 |
| HAHATOE LOKOSSA OÜ kustutatud (former name Prostir OÜ) | 14351909 |
| HECATON SOLUTIONS OÜ | 17368030 |
| CAVATON GRUPP OÜ | 12613587 |
| HAUSTON GRUPP OÜ | 10788561 |