Warren Buffett is Heisenberg?

Billionaire investor Warren Buffett took his love of "Breaking Bad" to another level Sunday night during the season finale of the award-winning series.

The Oracle of Omaha tweeted a picture of himself as Heisenberg, the alter ego of former chemistry teacher Walter White turned crystal meth kingpin, along with the message "Not even the Oracle knows what will happen tonight. #waltsuccessor."

The tweet came two minutes into the final episode and was MORE

Teens ditch Abercrombie & Fitch, stock tanks 18%

Abercrombie & Fitch may try to attract "cool, good-looking" customers and employees, but the retailer's financial performance is just ugly.  So much for summer girls, and anyone else for that matter, liking Abercrombie.

Teens, particularly girls, are ditching Abercrombie as well its sister brand Hollister. Same store sales, a key measure for retailers, tumbled 10% during the second quarter, leading to worse-than-expected earnings and revenue for the retailer. Shares of Abercrombie MORE

Apple tops $500. Thanks, Carl Icahn!

Cue the Apple "iCahn" jokes. Apple's stock topped the $500 mark Wednesday for the first time since January. Shares moved higher for a second day on the news that activist investor Carl Icahn has taken a "large" position in the company.

Shares crossed the psychologically important level and climbed as high as $504.25 in afternoon trading, before settling just below the mark at $498.50.

Still, the recent gains have boosted Apple's value by MORE

Facebook rallies 30%, logs best day ever

Facebook shares rallied an impressive 30% Thursday, allowing the stock to book its best one-day gain ever. And while shares remain about 10% below the May 2012 IPO price of $38, analysts are predicting that Facebook is finally on its way to reaching, and even crossing, that threshold.

"Facebook delivered its strongest quarter yet as a public company -- results that we think could be thesis-changing for many," said Doug Anmuth, a MORE

Caterpillar's disappointing earnings good for Jim Chanos

It's looking like a good day for at least one famous short seller.

Just a week after hedge fund investor Jim Chanos announced he was betting against Caterpillar, the industrial equipment maker reported disappointing earnings and cut its outlook for the year.

The bad news sent shares of Caterpillar (CAT) nearly 3% lower Wednesday. The stock trimmed some of the losses as they day went on, but remained down 1.7% in the MORE

Cybersecurity stocks heat up on Cisco-Sourcefire deal

While the broader market was largely quiet Tuesday, one sector was on fire: cybersecurity.

Shares of Sourcefire (FIRE) jumped nearly 28% after networking giant Cisco (CSCO) said it agreed to buy cybersecurity firm for $2.7 billion.

The deal, which was priced at a 29% premium over Sourcefire's closing price Monday, will help Cisco bolster its network security services.

"Today's sophisticated threats are able to circumvent traditional, disparate security products," said Christopher Young, senior MORE

Gold prices top $1,300, 1-month high

Gold prices surged more than 3% Monday, topping $1,300 an ounce for the first time in a month.

Prices of the precious metal were boosted by a weaker U.S. dollar, which declined against most global currencies, including the euro, the pound and the Japanese yen. Commodities such as gold are priced in the dollar and gain ground when the U.S. currency declines.

Gold prices had been falling until recently, as the dollar MORE

Microsoft plunges 11%, worst day since 2009

It was a bloody day for technology stocks on Wall Street, as investors punished the entire sector after Google and Microsoft both delivered disappointing earnings results.

Microsoft (MSFT) took the worst beating, plunging more than 11% -- its worst one-day drop since January 2009. The company badly missed Wall Street's profit forecasts after taking a huge write-down on its Surface tablet last quarter.

That bad news as was a hot topic among MORE

Netflix: Emmy noms are good, but earnings better be too

Carl Icahn has yet to sell even just one share of his stake in Netflix, and for good reason: the stock is currently trading at a three-year high and may soon be on its way to an all time-high.

While shares of the usual high-flier bounced around the breakeven line Thursday, they've been having quite the run.

Shares of Netflix (NFLX) have rallied 10% over the past five days, and have nearly MORE

Muddy Waters bets against first U.S. company

Muddy Waters may be best known for spotting fraudulent accounting practices across Chinese companies, but the short-selling firm has made its first call against a U.S. company.

Muddy Waters, run by Carson Block, issued a "strong sell" rating on American Tower, a Boston-based wireless and broadcast tower provider, and valued the company at $44.57 per share -- down 40% from its current price.

"AMT has serious challenges domestically and internationally that have MORE