Yes, and the spread almost always goes wide at the end of the day and into the next open as bargain hunters and manipulative shorts toss low-ball bids up there like they're shooting craps. When successful at helping the pps to overcorrect, shorters can cover at a good profit, and both can load up for the next run. They make money on the pps trend in BOTH directions, covering and loading when low and shorting/dumping when high, so the more yo-yo effect they can help create the more profit they make. Volatility is what they want. Regardless of the flipping swings, the pps will still trend up nicely as progress and earnings reports drive valuation upward.