Is Yahoo! a trick or a treat?  Is GM a trick or a treat?  In today's special Halloween edition of MarketFoolery,  we tackle those questions and share some additional treats.

European leaders beef up the bailout.  Exxon Mobil and Royal Dutch Shell report big profits on higher oil prices.  And Visa reports higher profits on increased credit and debit card activity.

Shares of Amazon drop after the company reports a decline in quarterly profits.   Shares of Ford slide despite big quarterly sales.  And shares of Tupperware tumble despite strong sales in emerging markets.

Shares of Netflix tumble after the company reports worse-than-expected subscriber loss.  Shares of Under Armour rise on better-than-expected earnings.  And 3M reports weaker-than-expected earnings and warns of weakening consumer demand.

Caterpillar reports big earnings.  Google eyes Yahoo!.    And Mattel makes a big bet on Thomas the Tank Engine.

Microsoft CEO Steve Balmer shares his thoughts on Google.  eBay and Nokia report earnings.  And markets respond to the events in Libya.

Apple reports weaker-than-expected earnings.  Intel reports stronger-than-expected earnings.  Visa increases its dividend.  And KFC debuts the Cheesy Bacon Bowl.

Coca-Cola reports strong international growth.  Goldman Sachs reports a rare loss.  And shares of IBM slip after the company reports weaker-than-expected sales.

Our analysts discuss two stocks that are overrated, two stocks that are underrated, and two stocks that have been overlooked.

Shares of JP Morgan tumble in the wake of earnings.  AOL considers a sale to Yahoo!  And rumors swirl around a potential Google acquisition of Akamai.

Research in Motion fails to connect.  Pepsi resists a breakup.  Alcoa reports weaker-than-expected earnings.  And Liz Claiborne announces it's selling its namesake brand.

Shares of IBM hit an all-time high.  General Mills deals with a sweet problem.  Ben & Jerry's voices support for Occupy Wall Street.  And China's sovereign-wealth fund bets big on China's four largest state banks.

Apple breaks a record for iPhone sales.  And Netflix calls off the break-up.

Our analysts reflect on the life and legacy of Apple co-founder Steve Jobs.

Yum Brands continues to struggle in the U.S. and succeed overseas. Costco’s latest quarterly earnings comes with news of a 10% increase in membership fees. Friendly’s declares bankruptcy as the restaurant industry gets more competitive.

Apple unveils the iPhone 4S.    Will Apple's newest phone connect with consumers?

What does the future hold for Greece?  Will Alibaba buy Yahoo?  And which companies might benefit from declaring that they're not going bankrupt?