Bullish option flow detected in ImmunoGen with 3,907 calls trading, 1.7x expected, and implied vol increasing almost 4 points to 66.08%. Sep-23 18 calls and Sep-23 16 calls are the most active options, with total volume in those strikes near 2,200 contracts. The Put/Call Ratio is 0.03. Earnings are expected on November 3rd.
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