Traders from market will always pumping and dumping the price of the bitcoin and if there's an millionaire traders that can really manipulate the price of bitcoin i think he can really control the price of bitcoin some other's say's that the price of bitcoin is manipulating by chinese trader and i don't think if this is true.
Bitcoin price purely controlled by supply and demand since the beginning until the end, traders, investors, people, corporate, company, whatever they are who buy and sell bitcoin is the reason why price rise and fall, but buy and sell are influence by economics condition, market cap, gov regulations, hacked, all these news affected people to do so, buy or sell bitcoin.