No one. Bitcoin is a decentralized network, every one control bitcoin.
Maybe you should try to search some basic information about bitcoin

That's the idea. Bitcoin is a decentralized network and everyone controls bitcoin. But is it absolutely true?
From what I know, the chinese miners are able to control the price of bitcoins whenever they want because they own a high amount of percentage of bitcoins and if they decide to dump, well, you know what's going to happen and if they decide to pump, well, pump it is!
okay,we already know about this,but if we read some post that talk about bitcoin regulated in japan,then what will you said about that?i my self still not sure what will happen in japan,i mean what will happen to bitcoin??