ImmunoGen call volume above normal and directionally bullish

Bullish option flow detected in ImmunoGen with 5,970 calls trading, 1.8x expected, and implied vol increasing almost 20 points to 99.53%. Dec-23 20 calls and Jan-24 21 calls are the most active options, with total volume in those strikes near 3,800 contracts. The Put/Call Ratio is 0.02. Earnings are expected on February 29th.