Lots of computerized trading aimed at controlling the price. Also possible injection of artificial liquidity in anticipation of a run up on news.
Street Boy A (Broker, MM, Hedge fund) sells shares he doesn't have $5.90 to Street Boy B to control the price. Street Boy B Sells them back to Street Boy A at $14 on a run up on news. Street Boy A sells them at $13, and back and forth through ups and downs pocketing money every time.
Of course, this is over simplified, there may be thousands of computerized transactions using this artificial liquidity. As long as they keep the fake shares moving they keep making money. When the MOMO slows down they shake the tree to buy real shares and settle.