There have been quite a few stocks gapping up or down which exhibit similar trends post gap. It has taken me a good deal of time to really understand the mechanics behind why almost every relatively high beta stock trades flat after a gap. I could be totally wrong but at least i have convinced myself this is what is happening so i can avoid the undue stress of a non performing trade!
Upside skew brings me to gaps up, the chart above is of NVDA, you can see the clear gap and the subsequent flat but slightly upward sloping trend. Again this is the algorithms at work keeping these things bid as the actual real human market interest dries up. Key word "human". Most of the volume and business is done in the early AM these days, once the business is done you will see any stocks volatility and range become sideways. BECAUSE most speculators are still out of this market, ie no real retail interest after the fundies do their heavy lifting. Those supplemental liquidity providers are in place to help keep the markets from doing this all day everyday. I gotta give them some credit i guess.