Some poster here seem to object about announcemts occuring after the bell. It seems to be standard operating procedures for most companies to wait until the market is closed but that points seems lost on a few people here. I "googled" the subject and found the following:
"Generally, important, company-specific news is released after the bell to give investors time to dig through the information and make informed buy and sell decisions. In addition, announcements after the close of trading provide order and stability to the markets. News released during the trading day or before the bell (prior to the start of the trading session) could generate negative consequences, like panic-selling, unbridled speculation and buy/sell imbalances. Pertinent news announced after the bell leads traders to trade stock based on the fresh information, although in very thin markets. However, it should be noted that traders may trade stock after the bell for a variety of reasons, which may not be related to company news releases."