What manga company makes the most popular manga in japan?

I dont know the company,but I believe the best manga writer depends on which manga series is your favorite. My personal favorite is Naruto,(which has 50 volumes so far), and my second favorite is dragonballZ,(which has 26 volumes),but both are written by different persons. Naruto is written by Masashi Kishimoto, and DragonballZ is written by Akira Toryima. Both are very good manga series and if you are looking to start enjoying manga, these might be your new favorite thing to read.