| Company name | Reg. code |
|---|---|
| TESTONA OÜ | 10457982 |
| TESTING OÜ | 12203085 |
| TESTIAN OÜ | 17220846 |
| TESTONICA LAB OÜ | 11169435 |
| IP TESTING OÜ | 12745633 |
| ACCEPTANCE TESTING OÜ (former name KVUX OÜ) | 14193072 |
| QUALITY TESTING OÜ | 17113553 |
| QUALITEK TESTING OÜ | 14305789 |
| PROTO-TESTING OÜ | 17403185 |
| NONDESTRUCTIVE TESTING OÜ | 14052710 |
| TESTAMA PROPERTIES OÜ | 12585193 |
| TESTING INVEST OÜ | 17283120 |
| SP TESTING OÜ kustutatud | 14027474 |
| EUROFINS ENVIRONMENT TESTING HOLDING ESTONIA OÜ kustutatud (former name EF Environment Testing Estonia Holding OÜ) | 14227428 |
| MASTERS OF TESTING OÜ | 16653388 |
| GUN TESTING LAB OÜ | 16943749 |
| INTERNATIONAL TESTING SERVICES OÜ kustutatud | 10475678 |
| NONMETALLIC INSPECTIONS AND TESTING OÜ | 14543046 |
| INTERTEK TESTING SERVICES EESTI OÜ kustutatud | 10758593 |
| NDT-TEKNIK-AND-TESTING OÜ kustutatud | 12097795 |
| TESORA OÜ kustutatud (former name btc2card OÜ) | 14930180 |
| TESTO OÜ kustutatud | 12083149 |
| TESTRA INVEST OÜ | 14631773 |
| TESTRA SERVICE OÜ kustutatud | 12647284 |
| TESSON PÄRNU OÜ | 10130146 |
| FN TESTOR OÜ kustutatud | 10257869 |
| TESRON EHITUS OÜ (former name Evicon OÜ) | 11926901 |
| EUROFINS SCIENTIFIC ESTONIA OÜ (former name Ramboll Environment OÜ) | 12893983 |
| AURELIAN SOLUTIONS OÜ (former name Start Testing OÜ) | 14337163 |
| TESTA GRUPP OÜ | 16147936 |
| TRENDLINE CONSULT OÜ (former name Testost OÜ) | 12144945 |
| TECTONA PARTNERS OÜ kustutatud | 16080366 |
| TECTONA PROPERTY OÜ | 17421898 |
| DESTONA INVEST OÜ | 12553135 |
| ZESTONA TRADE OÜ | 17156597 |
| TISTONNA OÜ | 16214393 |
| BESTONIA OÜ | 12458454 |
| FESTONIA OÜ | 16172370 |
| GTESTONIA OÜ kustutatud | 11359508 |
| DESTINA OÜ kustutatud | 11467801 |
| ESTONIA 360 OÜ | 12502907 |
| HESTONE OÜ kustutatud | 10056483 |
| DECTONA OÜ | 10524135 |
| HELTONA OÜ kustutatud | 10018142 |
| WESTONIA OÜ kustutatud | 11740800 |
| VASTONA OÜ kustutatud (former name Namron OÜ) | 14462678 |
| TERRONA OÜ kustutatud | 10951216 |
| BERTONA OÜ kustutatud | 12045574 |
| ESTONIA OÜ | 10038386 |
| ESTONIA 24 OÜ | 12275877 |