Alexion (ALXN) has been on our M&A watch for a while and we caught a number of unusual bullish trades just days before the buyout offer from AstraZeneca that sent shares soaring, and resulted in enormous gains.

Some alerts from the live Trading Hub:

12/11: “Alexion (ALXN) buyer of 3,150 January $130 calls for $2.80, follows the OTM call buying yesterday and name often brought up in M&A talks”

12/10: “ALXN far OTM Dec. 24th (W) $130 calls bought 550X $0.70 to $0.80, stock seems to be reacting to that a bit, moving to highs, long time M&A speculation”