Companies whose shares are expected to trade actively in today’s session are Facebook Inc (NASDAQ:FB),, Inc. (NASDAQ:AMZN), Copano Energy, L.L.C. (NASDAQ:CPNO), Chesapeake Energy Corporation (NYSE:CHK), Spansion Inc. (NYSE:CODE) and ISIS Pharmaceuticals, Inc. (NASDAQ:ISIS).

stocks to watch

Facebook Inc (NASDAQ:FB): The social networking giant is expected to announce its fourth quarter earnings today. Analysts estimate Facebook Inc (NASDAQ:FB) to post $1.51 billion in revenues with earnings of 15 cents a share. Shares were up 2 percent to $31.43 in early market trading., Inc. (NASDAQ:AMZN): Though the online retailer missed bottom-line analysts estimates, its fourth quarter revenues jumped 22 percent. Amazon posted $21.27 billion in the fourth quarter revenues with 21 cents a share in earnings. Analysts were expecting 28 cents per share on revenue of $22.26 billion. The company has also lowered its guidance for the first quarter., Inc. (NASDAQ:AMZN) expects sales between $15 billion and $16.6 billion, compared to analysts’ estimate of $16.85 billion in the first quarter. Shares were up 7.46 percent to $279.76 in early market trading.

Copano Energy, L.L.C. (NASDAQ:CPNO): Copano is being acquired by Kinder Morgan Energy Partners LP for $3.72 billion. The pipeline company Kinder Morgan is expanding its midstream services. The deal values Copano at $40.91 a share, a 24 percent premium to its closing price on Tuesday. Shares surged 17.11 percent to $38.80 in early trading session.

Chesapeake Energy Corporation (NYSE:CHK): The country’s second largest natural gas producer announced that its co-founder and CEO Aubrey McClendon is resigning on April 1, 2013. McClendon has pulled Chesapeake into deep controversies that triggered several investigations by Federal authorities. Shares surged 9.75 percent on the news of his exit to $20.85 in early market trading.

Spansion Inc. (NYSE:CODE): Reporting a solid margin, the company swung to profits during the fourth quarter. However, results missed Wall Street estimates, and the company forecasts lower earnings for the first quarter of 2013. Shares plunged 8.73 percent to $12.02 in early trading.

ISIS Pharmaceuticals, Inc. (NASDAQ:ISIS): The pharmaceutical company’s mipomersen molecule has been approved by the U.S. Food and Drug Administration. The drug will be used to treat a rare disease that can cause high cholesterol levels. It will be marketed by Genzyme unit of Sanofi. Isis shares rose 11.50 percent to $14.92 in early trading.