Momenta Pharmaceuticals, Inc. (MNTA)

[jbog]

As floblu noted, these options did not expire until Oct 2013, and hence the exercise-and-hold maneuver is a bona fide bullish signal

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With as quantity of insider trading in this stock to assume anything is either bullish or bearish is plain foolishness. The last time you had this 'bullish' feeling was when Sulat bought and held back in December when the stock was in the upper teens.