| Company name | Reg. code |
|---|---|
| ZITTER OÜ | 11011656 |
| ZITEX OÜ kustutatud | 14302006 |
| FITTER OÜ | 14106713 |
| BITTER OÜ | 16963605 |
| KITTEL & KITTEL OÜ | 10741080 |
| BITTER ORANGE OÜ | 14714045 |
| RITTER KV OÜ kustutatud | 10379331 |
| FITTER BALTIC OÜ kustutatud | 11456698 |
| FITTER KONSULT OÜ | 17443316 |
| FITTER TEENUSED OÜ | 17138027 |
| RITTER PROGRAM OÜ (former name PowerCode OÜ) | 16148644 |
| RITTER PROJECTS OÜ | 14630420 |
| BEST BITTER OÜ | 12708267 |
| RITTER TELE OÜ | 10129522 |
| EMITTER OÜ | 10943636 |
| FOTTER OÜ | 16880894 |
| FIXTER OÜ | 17135247 |
| GETTER OÜ | 10946741 |
| BITSTER OÜ kustutatud | 12608451 |
| FINTER OÜ | 17270850 |
| BLITTER OÜ | 11918913 |
| CATTER OÜ kustutatud | 12803744 |
| DIPTER OÜ | 11508782 |
| GITPER OÜ | 16790151 |
| AIXTER OÜ | 11050308 |
| GLITTER OÜ | 14194166 |
| COTTER OÜ kustutatud | 11451254 |
| AITHER OÜ (former name OÜ Aither) | 11271452 |
| FITLER OÜ kustutatud | 11582904 |
| GISTER OÜ | 12717329 |
| KILTER OÜ | 11302253 |
| ECO LITTER BOX OÜ | 12510456 |
| J. KITTER ÕIGUSABI OÜ kustutatud | 12239640 |
| BETTER BUSINESS OÜ | 11679377 |
| BETTER CHAIN OÜ | 16087049 |
| BETTER BODIES OÜ | 17204801 |
| BETTER LIFE OÜ kustutatud | 12591466 |
| FOOD FILTER OÜ | 16667054 |
| OFF-KILTER OÜ kustutatud | 16159553 |
| FILTER HOLDING OÜ kustutatud | 16100459 |
| HS KETTER OÜ | 16202852 |
| FILTER24.EE OÜ kustutatud | 11862294 |
| GUTTER ARENDUS OÜ kustutatud | 11160333 |
| BETTER PRICE OÜ | 16024899 |
| GOOD BETTER OÜ | 17043261 |
| FITTED FABRICS OÜ | 16822879 |
| FILTER PLUS OÜ (former name Dagoterm OÜ) | 14610854 |
| FILTER EUROPE OÜ (former name Filter Waste OÜ) | 12615706 |
| KALLE KILTER OÜ | 10035092 |
| KATTER SERVICE OÜ | 12469601 |