| Company name | Reg. code |
|---|---|
| HAATON OÜ | 16305256 |
| HAAKON OÜ | 14622981 |
| HAAKON PROJEKT OÜ | 11251596 |
| HAAKON GRUPP OÜ kustutatud | 11224642 |
| HAAKOH OÜ | 11523296 |
| HAALSTON OÜ | 14975691 |
| HAASOR OÜ | 12300894 |
| HAARAN OÜ | 17106524 |
| HAAKEN DESIGN OÜ | 14370025 |
| HAAKOH GROUP OÜ | 14152587 |
| HAAVOL ARENDUS OÜ | 11076822 |
| HAAMAN EHITUS OÜ | 14109887 |
| NATHALIE VAN HAAREN COACHING OÜ kustutatud | 16307798 |
| HAKTON OÜ | 16102352 |
| HARTON OÜ | 12424194 |
| HALTON OÜ (former name OÜ PROFISA PARTNER) | 11594327 |
| HEATON OÜ kustutatud | 14362793 |
| HARATON OÜ | 17107601 |
| CANTON OÜ | 10846488 |
| GALATON OÜ | 10792255 |
| CAXTON OÜ | 12802395 |
| DANTON OÜ | 12726937 |
| DALTON OÜ | 12485422 |
| DAYTON OÜ (former name Dayton Machinery OÜ) | 11503230 |
| BACTON OÜ | 16040208 |
| EHNATON OÜ (former name Ehnaton UÜ) | 16187489 |
| AARTON OÜ | 12368171 |
| DAYTON OÜ kustutatud | 10205594 |
| FRATON OÜ | 14830811 |
| HABITON OÜ | 14470531 |
| CARTON OÜ | 12149606 |
| AHAKON OÜ kustutatud | 10405301 |
| EASTON OÜ | 14031398 |
| AGATON OÜ | 16692282 |
| EHALTON OÜ | 16513747 |
| CAVATON OÜ | 12583047 |
| TALLINNA KOLLASED LEHED OÜ (former name HAAKOH E-LAHENDUSED OÜ) | 14292650 |
| BARTON GLOBAL OÜ | 14298285 |
| BAUTON PAINTING OÜ | 16618334 |
| GALATON BUSSID OÜ | 11050053 |
| GALATON REISID OÜ kustutatud | 11040882 |
| DIATON-GRUPP OÜ | 10727619 |
| DARTON PARTNERS OÜ kustutatud | 11610316 |
| GALATON TOUR OÜ | 11448790 |
| DALTON HOLDING OÜ kustutatud | 10303316 |
| GASTON GRUPP OÜ | 16301152 |
| DALTON EESTI OÜ kustutatud | 11693124 |
| DALTON BALTIC OÜ | 11265115 |
| HAHATOE LOKOSSA OÜ kustutatud (former name Prostir OÜ) | 14351909 |
| CAVATON GRUPP OÜ | 12613587 |