Merck & Co., Inc. (MRK) is at an implied volatility extreme high of 53.73% that is greater than 97.58% of past values prior to 7/28/2010 (Close Price 34.74). On prior close, 7/27/2010, the implied volatility was 21.83% and at the 19.57 percentile. Closing price was 35.18.

Today's News on Merck & Co., Inc.