U.S. stock index futures inch higher; News Corp eyed

U.S. stock index futures inch higher; News Corp eyed
* U.S. stock index futures pointed to a slightly higher open on Wall Street on Thursday, halting a three-session retreat, with futures for the S&P 500 up 0.04 percent, Dow Jones futures up 0.1 percent and Nasdaq 100 futures up 0.1 percent at 0910 GMT.
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Day 2 at the VIC: Stock Ideas Galore

Day 2 at the VIC: Stock Ideas Galore
A Foolish rundown of all the highlights from the Value Investing Congress.
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A Stock Market That Can’t Decide

A Stock Market That Can’t Decide
What accounts for the recent disconnect between corporate profits and stock performance?
Read more on WallStreet Journal via Yahoo! Finance

Stock markets retreat on JPMorgan Chase earnings, consumer sentiment data

Stock markets retreat on JPMorgan Chase earnings, consumer sentiment data
TORONTO – The Toronto stock market moved lower in late Friday morning trading as tepid economic data and some earnings reports failed to live up to elevated expectations.
Read more on The Canadian Press via Yahoo! Canada News

Why does a company’s stock price generally go up on a good announcement, then retreats days after?

I understand that many institutional investors buy lots of shares the day a company announces good news. Usually, the next day, the stock price retreats a little, only to eventually go back up. Why does this happen?