Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

So far, 2014 has been a blunt reminder that stocks can be volatile: yesterday's 300-point drubbing was the second fall of that magnitude in this young year, compared to just one such daily drop in all of 2013, and only one in 2012. Of course, stock price swings are irrelevant to a company's underlying business and can present buying opportunities for long-term investors. In fact, it appears buyers are returning to the stock market today, as the Dow Jones Industrial Average (DJINDICES:^DJI) gained 41 points in premarket trading this morning.

Meanwhile, news is breaking on several stocks that could see heavy trading in today's session, including Disney (NYSE:DIS), Sirius XM Radio (NASDAQ:SIRI), and International Paper (NYSE:IP).

Disney is set to lay off hundreds of people at its interactive gaming division, according to The Wall Street Journal. That unit has been the company's only business line to consistently lose money over the last five years, including $87 million in Disney's fiscal 2013. Still, the business turned a profit last quarter, thanks to the successful introduction of the new video game Infinity, which has held up well against Activision Blizzard's profitable Skylanders franchise. Investors should learn more about Disney's digital plans tomorrow when the entertainment giant reports quarterly earnings results. Disney's stock is up 1.4% in premarket trading.

Sirius XM today posted fourth-quarter earnings results in which sales jumped by 12%, to reach a record $1 billion. Profit came in at $0.01 a share, slightly below estimates, as a significant drop in subscriber acquisition costs was overwhelmed by a spike in the company's revenue sharing and royalty expenses. Still, Sirius affirmed its overall guidance for 2014, saying it expects to book $4 billion in revenue and 1.25 million net subscriber additions. The stock is up 0.3% in premarket trading.

Finally, International Paper today announced quarterly earnings results that were below analysts' estimates. Sales clocked in at $7.2 billion, while Wall Street had expected $7.4 billion. Operating profit also came in surprisingly low, at $0.83 a share. The company's industrial packing profit fell as a shorter shipping quarter and a seasonal demand dip hurt sales volumes. International Paper's stock is down 0.24% in premarket trading.

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Demitrios Kalogeropoulos owns shares of Activision Blizzard and Walt Disney. The Motley Fool recommends Activision Blizzard and Walt Disney. The Motley Fool owns shares of Activision Blizzard, Sirius XM Radio, and Walt Disney. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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