The sideways price action over the last 4-6 months appears to suggest a triangle, so that would fit well for a 4th wave of an impulse, the strong upside is a classic post thrust from a triangle. In Elliott wave terms we label that as a terminal 5th wave of an impulse wave. Essentially the spike is a terminal move. If you own this stock you may want to consider cashing out, or at least sticking stops at 280.00

A big move back under 280.00 is needed to support further downside and argue the advance from the 2016 could well have ended. The bigger picture idea (not shown) can also for a major top.

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