In this daily bar chart of EXAS, below, we can see an uptrend over the past 12 months - EXAS has made higher lows and higher highs. Prices have moved from the lower left part of the chart to the upper right. EXAS is above the rising 50-day moving average line and the rising 200-day line.
The pattern of volume below the price chart is not inspiring. Yes, volume was strong in April through August, but since then it has been boring and the On-Balance-Volume (OBV) line has not made much upside progress since September. A rising OBV line would tell a more bullish story.
The Moving Average Convergence Divergence (MACD) oscillator crossed to the downside in early February, signaling a take-profits sell signal.
In this weekly bar chart of EXAS, below, we can see a nine-fold rally from May 2016. Prices are above the rising 40-week moving average line, so we know the trend is positive. The volume pattern is "dormant" and the OBV line on this time frame is neutral.
The weekly MACD oscillator is above the zero line in bullish territory but narrowing towards a possible crossover.
In this Point and Figure chart of EXAS, below, we can see a downside price target around $69. A trade of $80.63 will be a new low for the move down and could precipitate further losses.
Bottom line strategy: EXAS has rallied significantly in the past three years, but some of our indicators suggest a cautious approach to prices right now. A weekly close below $79 would be my trigger point to reduce one's long exposure.