pt, You don't really want to trade this stock--it'll drive you crazy at tax time. If you want to trade around your position, use options; the vol is usually low so they are not too expensive.
In December, MWE issued over 10M shares; the price dropped from about $56 to about $54 at close, I believe, but recovered and kept rising nicely as the market digested the new shares and the continuing good news. This was the most recent issue. The same thing will likely happen now, just as in the past. Consider some long-dated calls.