Auxilium Pharmaceuticals Inc. (AUXL) is trading down .27 to 16.03.? The index is trading near the bottom of its 52-week range.

The AUXL May 15 puts traded for .50 in a block of 753 contracts. The average volume is 803 contracts.? The open interest is 0 on the strike.

The volume is over 1,000 contracts with the IV pressing higher 5.8 points to 53%.? The trade does look like a heavy downside bet.

30-day implied volatility is 53%.? ?10-day implied volatility is 27%.? 30-day implied volatility is trading well above the 10-day historical volatility.

Auxilium Pharmaceuticals, Inc. (Auxilium) is a specialty biopharmaceutical company with a focus on developing and marketing products to predominantly specialist audiences.