$Pfizer (PFE.US)$$Arena Pharmaceuticals (ARNA.US)$ By the c...

$Pfizer (PFE.US)$ $Arena Pharmaceuticals (ARNA.US)$ By the close of trading on Dec. 13, The company was up 80.38%, trading above $90. Analysts say the reason for the jump is that it is likely to be acquired by global pharmaceutical giant Pfizer. Pfizer announced on the same day that it intends to pay $100 per share for The cash acquisition of Arena Pharmaceuticals. The price represents a 100% premium to Arena's Friday closing price of $49.94.