Bullish option flow detected in ImmunoGen with 4,018 calls trading, 1.1x expected, and implied vol increasing over 2 points to 87.24%. Dec-23 17 calls and Jan-26 27 calls are the most active options, with total volume in those strikes near 3,100 contracts. The Put/Call Ratio is 0.02. Earnings are expected on February 29th.
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