If you mean by controling the bitcoin its price, then it is supply and demand which control it.
Bitcoin is a decentralized currency so every one who run a node, every miner and every holder, are sharing the control in somehow
In theory this is pretty correct, but in practice big miner companies and speculators do have a significant power over the price of the currency and it's own supply and demand. hence we can say they have a level of control over bitcoin.