| 4521 | Megamin | http://www.megamin.hr |
| 4522 | Mega-Poliplet d.o.o. | http://www.mega-poliplet.hr |
| 4523 | Megatrade d.o.o. | http://www.megatrade.com.hr |
| 4524 | Megatrend d.o.o. | http://www.hr.megatrend.com |
| 4525 | Megonix d.o.o. | http://www.megonix.hr |
| 4526 | Megrad d.o.o. | http://www.megrad.hr |
| 4527 | Mehanic-nautic d.o.o. | http://www.mehanic-nautic.hr |
| 4528 | Mehanika – inženjering d.o.o. | http://www.mehanika.co.yu |
| 4529 | Mehanika d.o.o. | http://www.tehnometal-hr.com |
| 4530 | Mehun media | http://www.mehun-media.hr |
| 4531 | Melchior tr., obrt | http://cpl.hr |
| 4532 | Melem | http://www.melem.com |
| 4533 | Meli d.o.o. | http://www.meli.hr |
| 4534 | Meli, obrt | http://www.meli.com.hr |
| 4535 | Memo d.o.o. | http://www.memo.hr |
| 4536 | Memorijal Ašli Kožar | http://www.memorijal-akv.hr |
| 4537 | Menart d.o.o. | http://www.menart.hr |
| 4538 | MENCL | http://www.mencl.hr |
| 4539 | MERC Nekretnine | http://www.merc-nekretnine.hr |
| 4540 | Merces d.o.o. | http://www.tempet.hr |