Auxilium Pharmaceuticals Inc. (NASDAQ:AUXL) is due to issue its quarterly earnings report in the upcoming extended-hours session. Given its history, traders can expect light trading in the issue immediately following its quarterly earnings announcement. Historical earnings event related premarket and after-hours trading activity in AUXL indicates that the price change in the extended hours is likely to be of limited value in forecasting additional price movement by the following regular session close.

Last 12 Qtrs Positive Only Price Reactions Percent of time added to extended-hours gains: 33.3% Average next regular session additional gain: 2.3%

Over the prior three fiscal years (12 quarters), when shares of AUXL rose in the extended-hours session in reaction to its earnings announcement, history shows that 33.3% of the time (2 events) the stock posted additional gains in the following regular session by an average of 2.3%.

Last 12 Qtrs Negative Only Price Reactions Percent of time added to extended-hours losses: 100% Average next regular session additional loss: 4.4%  Over that same historical period, when shares of AUXL dropped in the extended-hours in reaction to its earnings announcement, history shows that 100.0% of the time (5 events) the stock dropped further, adding to the extended-hours losses by an average of 4.4% by the following regular session close.

Isis Pharmaceuticals (NASDAQ:ISIS) is due to issue its quarterly earnings report in the upcoming extended-hours session. Given its history, traders can expect light trading in the issue immediately following its quarterly earnings announcement. Historical earnings event related premarket and after-hours trading activity in ISIS indicates that the price change in the extended hours is likely to be of limited value in forecasting additional price movement by the following regular session close.

Last 12 Qtrs Positive Only Price Reactions Percent of time added to extended-hours gains: 33.3% Average next regular session additional gain: 9%

Over the prior three fiscal years (12 quarters), when shares of ISIS rose in the extended-hours session in reaction to its earnings announcement, history shows that 33.3% of the time (1 event) the stock posted additional gains in the following regular session by an average of 9.0%.  Last 12 Qtrs Negative Only Price Reactions Percent of time added to extended-hours losses: 80% Average next regular session additional loss: 3.6%

Over that same historical period, when shares of ISIS dropped in the extended-hours in reaction to its earnings announcement, history shows that 80.0% of the time (4 events) the stock dropped further, adding to the extended-hours losses by an average of 3.6% by the following regular session close.