Amarin Corp Plc (AMRN)

[FlyFishingStocks]

When it happens on low volume, it usually doesn't mean much at all.

That's not always true - especially if the daily range is expanded (which it was yesterday). Such a move on low volume means easy upward price movement, - or low bear power - indicating both a lack of supply (investors are holding/shorts are not reloading) and a clear path to higher prices.